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| Public Domain |
Sunday, 23 August 2015
How rainbows are created
Everyone is familiar with rainbows. That
multicolored band of light arching over the sky on a rainy day is one
of the most amazing spectacles in nature bringing cheer and wonder to
the admiring beholder.
Rainbows are created by light
reflecting in water droplets in the air which causes a spectrum of light
to appear as a multicolored arch in the sky. The water droplets are
usually falling as rain but a rainbow can be formed in a fountain, a
waterfall and sometimes in fog. A rainbow appears to the observer when
the sun is behind them and shining onto rain or water droplets in front
of them. The sun must be behind the observer and the water drops in
front. Read more
Friday, 22 May 2015
The Were-plant by the light of the moon!
A rather unremarkable and scruffy looking plant studied by two scientists has been dubbed the were-plant after it was discovered that it only pollinates during the light of the full moon in June. A study Moonlight pollination in the gymnosperm Ephedra (Gnetales) undertaken by Catarina Rydin , Kristina Bolinder, Published, 1 April, 2015, looked at how Ephedra (Gnetales) reproduced
and in doing so made a remarkable discovery. The study is the result
of four seasons of field studies so far which show a surprise
relationship between pollination of one of the study species of plants
with the lunar cycle in one of the species that they were studying.
This work looks at how the discovery was made and what problems the
researchers see for the future of the plant.
Cycles of the moon
The cycles of the moon are are used by a many animals for a number of reasons such as navigation and communication. Now researchers have discovered the first known case of a plant that times its reproduction to the cycles of the moon. The plant is a rather modest shrub found in areas around the Mediterranean and is known as Ephedra foeminea though since the discovery of its connection to the moon it has been nick-named the were-plant. This is because the plant is a non-flowering relative of conifers and instead of flowers produces masses of red and yellow cones which during the full moon in July secretes sugary fluid to attract the nocturnal insects which pollinate it. Read more
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Ephedra foeminea - Author:
Gideon Pisanty (Gidip) -
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Cycles of the moon
The cycles of the moon are are used by a many animals for a number of reasons such as navigation and communication. Now researchers have discovered the first known case of a plant that times its reproduction to the cycles of the moon. The plant is a rather modest shrub found in areas around the Mediterranean and is known as Ephedra foeminea though since the discovery of its connection to the moon it has been nick-named the were-plant. This is because the plant is a non-flowering relative of conifers and instead of flowers produces masses of red and yellow cones which during the full moon in July secretes sugary fluid to attract the nocturnal insects which pollinate it. Read more
Friday, 1 May 2015
The ecology of sky islands
A sky island is a mountain that is situated in isolation within an area of lowlands where the environment contrasts greatly to the environment of the uplands of the mountain. Instead of being surrounded by water they are surrounded by low lying land. In a location such as this the environment changes dramatically from the lowlands to the mountain summit. This results in significant differences evolving in the natural habitat of both lowlands and uplands regions of the mountain.
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"Sky islands", Santa Catalina Mountains,
Arizona, USA. - Public Domain
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In such places it is not unusual to find species of fauna or flora that are limited to a certain altitudes. Such species of animals and birds may practice vertical migration up or down the mountain as the weather and seasons change in order to find food or shelter. Read more
How the Cascade Mountains were formed
The Cascade Mountain range of North America is part of the Pacific Northwest section of what is often called the “Pacific Ring of Fire“ that
circles around the Pacific Ocean. The range first began forming
millions of years ago through movement of the earth’s plate and volcanic
action with erosion also playing a part.
The Pacific Ring of Fire
From south to north the Ring runs around the Pacific Rim including the west coast of South and North America, the Aleutian Islands, and then south to north including Japan, Southeast Asia and New Zealand. This circle a volcanically active area that is also prone to earthquakes. Read more
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| The Cascade Mountains - Attribution: |
From south to north the Ring runs around the Pacific Rim including the west coast of South and North America, the Aleutian Islands, and then south to north including Japan, Southeast Asia and New Zealand. This circle a volcanically active area that is also prone to earthquakes. Read more
The Global Climate System
No matter where one lives on Earth, the weather and
climate play important parts in daily life. The weather is the
changing conditions in the atmosphere that occur all around, such as
rain, snow, wind or sunshine.
What is climate?
Climate is regional or global and is defined by the long-term averages of the extremes and variations in conditions and temperatures over extended periods of time. The climate system is how the atmospheric conditions are influenced by land and ice masses and oceans and how these affect the surface of the Earth. It is comprised of the following five elements that interact with one another and are influenced by other factors such as the Sun, volcanic eruptions and human. Read more
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| U.S. National Oceanic and Atmospheric Administration |
What is climate?
Climate is regional or global and is defined by the long-term averages of the extremes and variations in conditions and temperatures over extended periods of time. The climate system is how the atmospheric conditions are influenced by land and ice masses and oceans and how these affect the surface of the Earth. It is comprised of the following five elements that interact with one another and are influenced by other factors such as the Sun, volcanic eruptions and human. Read more
The six big mass extinctions
Through out history Earth has suffered a series of mass
extinction events that saw the continuation of life on Earth
threatened. There has also been a number of lesser extinctions but
this work concentrates on the main mass extinction events. First, we
will briefly define a mass extinction event and then look at the five
most devastating mass extinction events in history. Then the discussion
will look at the sixth and ongoing mass extinction event and conclude
with thoughts for the future.
What is a mass extinction event?
Each extinction varied in intensity and cause but each time life on Earth adapted, evolved and bounced back. A mass extinction event is a time in history where an extraordinary large number of different species die at the same time or within a limited time
The most well known of these events was the Cretaceous-Tertiary extinction which wiped out most of the dinosaurs. Nevertheless, there have been four other mass extinctions, some more devastating than this event, where half or more of all species were estimated to have died.
The most devastating of these events occurred at the end of the Permian period when 96% of species were wiped out. This event and the Cretaceous-Tertiary extinction event are the two main mass extinctions so far.
There have also been a number of smaller scale mass extinctions. For example human activity has caused the extinction of many animal and plant species throughout history and in modern times. In time these will show in the fossil record as a mass extinction. In fact we are going through a sixth mass extinction of plants and animals caused by humans but how devastating that will prove to be only time can tell. Read more
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| Artistic depiction Devonian land and flora - |
What is a mass extinction event?
Each extinction varied in intensity and cause but each time life on Earth adapted, evolved and bounced back. A mass extinction event is a time in history where an extraordinary large number of different species die at the same time or within a limited time
The most well known of these events was the Cretaceous-Tertiary extinction which wiped out most of the dinosaurs. Nevertheless, there have been four other mass extinctions, some more devastating than this event, where half or more of all species were estimated to have died.
The most devastating of these events occurred at the end of the Permian period when 96% of species were wiped out. This event and the Cretaceous-Tertiary extinction event are the two main mass extinctions so far.
There have also been a number of smaller scale mass extinctions. For example human activity has caused the extinction of many animal and plant species throughout history and in modern times. In time these will show in the fossil record as a mass extinction. In fact we are going through a sixth mass extinction of plants and animals caused by humans but how devastating that will prove to be only time can tell. Read more
What makes a spectacular sunset?
One of the most beautiful and spectacular displays in
nature comes towards the end of the day as the sun slowly sinks below
the western horizon. As it sinks lower its rays have to travel further
through the atmosphere to reach the eyes of the observer.
Light
Light travels in waves which are of different lengths. We normally see light as white, but it is actually made up of different colors. The different colors all have their own wavelength.
Magic
The magic begins as sunlight travels through earth's atmosphere Read more
Light travels in waves which are of different lengths. We normally see light as white, but it is actually made up of different colors. The different colors all have their own wavelength.
Magic
The magic begins as sunlight travels through earth's atmosphere Read more
Gemstones: Agate
Agate is a type of quartz from the chalcedony family. It
is created from seams of quartz that commonly consist of many colors.
It most often forms in veins or in rounded shapes.
A hard gem
Agate is a hard gem and is measured from 5 – 7 in the Mohs scale though it has a tendency to fracture. It is not unusual for small crystals of quartz known as drusy to appear inside a stone enhancing its appearance and giving distinction to individual gemstones. These stones are often cut at an angle and used as a main feature for a jewelry design. Read more
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| Fire Agate - Public Domain
By Wraithwing
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Agate is a hard gem and is measured from 5 – 7 in the Mohs scale though it has a tendency to fracture. It is not unusual for small crystals of quartz known as drusy to appear inside a stone enhancing its appearance and giving distinction to individual gemstones. These stones are often cut at an angle and used as a main feature for a jewelry design. Read more
Evidence that the global climate has changed
We know that the global climate has changed
because of evidence from a number of factors that is taken and collated
by scientists all around the world. Today, with orbiting satellites
and other modern technological instruments and techniques it is now
possible measure and record with accuracy how and where changes in
climate have taken place in many different parts of the world on a daily
basis. By various means this information is then put together to
construct a meaningful insight into what is happening with the global
climate.
NASA point out that while it is known that the global climate has changed a number of times in the past these were caused by natural changes in the way the planet orbits the Sun resulting in changes to the solar energy levels received on Earth. With temperatures now rising at an exceptionally unparalleled rate over the last 1300 years they believe the present trend is caused by human activities. Read more
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The Earth taken by the crew
of Apollo 17, NASA - Public Domain
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NASA point out that while it is known that the global climate has changed a number of times in the past these were caused by natural changes in the way the planet orbits the Sun resulting in changes to the solar energy levels received on Earth. With temperatures now rising at an exceptionally unparalleled rate over the last 1300 years they believe the present trend is caused by human activities. Read more
Looking at the polar lights
In
the skies over the polar regions of our planet an amazing natural
phenomena occurs that produces the most spectacular and amazing light
shows known as the Aurora borealis (Northern lights) and the Aurora
australis ( Southern lights).
Polar lights
The lights appear over the magnetic poles of the northern and southern hemispheres. Those that appear over the magnetic pole of the northern hemisphere are known as the northern lights or Aurora borealis. Those that appear over the magnetic pole of the southern hemisphere are known as the southern lights or Aurora australis. Read more
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| AuroraAustralis by Mozasaur - Public Domain |
The lights appear over the magnetic poles of the northern and southern hemispheres. Those that appear over the magnetic pole of the northern hemisphere are known as the northern lights or Aurora borealis. Those that appear over the magnetic pole of the southern hemisphere are known as the southern lights or Aurora australis. Read more
The Amazing Fungi Kingdom!
Fungi are a hugely diverse group of organisms that
despite their importance to maintaining the environment on Earth are
greatly understudied in comparison to plants and animals. They are
neither plants nor animals and belong to their own kingdom yet are of
vital importance to the well-being of both groups.
It is uncertain how many species of fungi there are globally. Estimates range from 700,000 to 5 million so clearly no one really knows. The most widely quoted estimate is 1.5 million which still makes it six times as diverse as flowering plants. Only about 100,000 species of fungi have so far been described.
Classifying fungi
Fungi are very important organisms that play a crucial part in the cycle of life on the planet. They are neither plants, or animals and are given their own kingdom in how life on Earth is classified. Read more
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Red cracking bolete (Boletus chrysenteron) - ByCC BY-SA 3.0
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It is uncertain how many species of fungi there are globally. Estimates range from 700,000 to 5 million so clearly no one really knows. The most widely quoted estimate is 1.5 million which still makes it six times as diverse as flowering plants. Only about 100,000 species of fungi have so far been described.
Classifying fungi
Fungi are very important organisms that play a crucial part in the cycle of life on the planet. They are neither plants, or animals and are given their own kingdom in how life on Earth is classified. Read more
Looking into the blue sky
On a clear day you look up to the sky and high above and
all around is a beautiful shade of light blue which ever way you look.
The Sun is a pale yellow so bright that you cannot and should not look
at it. As you look towards the horizon the blue gently pales to white.
You may be over come with a feeling of wonderment and awe as you gaze
around the seemingly limitless pale blue skies.
Why is the sky blue?
Why is it that the sky is blue and not green, or brown or yellow or any other color, or even one big rainbow? To answer that question you need to know a little bit about the atmosphere surrounding the Earth, a little bit about light and a little bit about something called Rayleigh scattering. To be satisfied with the answer you may to think a little about something else. Read more
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| Arne in December - blue skies! - By Ian Kirk - CC BY 2.0 |
Why is the sky blue?
Why is it that the sky is blue and not green, or brown or yellow or any other color, or even one big rainbow? To answer that question you need to know a little bit about the atmosphere surrounding the Earth, a little bit about light and a little bit about something called Rayleigh scattering. To be satisfied with the answer you may to think a little about something else. Read more
The sixth great mass extinction is already underway!
Over the last 450,000, 000 years the Earth has gone
through periods when up to 90% of life on the planet has perished in
mass extinctions. Looking back over such great distances in time makes
it difficult for humans to comprehend what happens with mass
extinctions. All we really have is the fossil record, geology, and
other sciences to help us understand what happened, by looking at what
remains today. Now for the first time humans can experience at first
hand what happens as a mass extinction event unfolds.
Does that sound interesting, fascinating and exciting? For the first time we can scientifically observe, record and chart the progress of this event as it happens, because it is happening in the here and now.
But wait a minute! if it is happening now doesn't that mean we are a part of it ? Yes it does, and if we are lucky humans just might survive as one of the few remaining species, but do not count on it.
Disappearing biodiversity
Humans do not know for sure how many species of fauna and flora we share the planet with but it is known to be millions. Although there are about 2 million species known to science it is estimated that there could be 5 to 15 million but could be as much as 100 million species altogether. Clearly there is a huge gap in our knowledge. Nevertheless it does show there is great biodiversity of life on the planet which biologists believe to be essential to maintain a healthy environment for all living organisms.
Some of these like bacteria and spores we can only see with a microscope. Many of the larger ones we see, we interact with them, we can count and study them and of course there are the ones we like, the cuddly, cute funny ones and the one that taste good. We have learned how to breed and domesticate animals and plants and keep them in such numbers that they seem safe from any threat of extinction. For example, cattle, sheep and chickens do not appear to be in danger of extinction as we breed them in their millions, but their existence depends on us. Nevertheless, the situation for many wild species of flora and fauna in the wild is becoming increasingly desperate. Read more
Does that sound interesting, fascinating and exciting? For the first time we can scientifically observe, record and chart the progress of this event as it happens, because it is happening in the here and now.
But wait a minute! if it is happening now doesn't that mean we are a part of it ? Yes it does, and if we are lucky humans just might survive as one of the few remaining species, but do not count on it.
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| Six month old baby giant panda - by Sheila Lau - Public Domain |
Humans do not know for sure how many species of fauna and flora we share the planet with but it is known to be millions. Although there are about 2 million species known to science it is estimated that there could be 5 to 15 million but could be as much as 100 million species altogether. Clearly there is a huge gap in our knowledge. Nevertheless it does show there is great biodiversity of life on the planet which biologists believe to be essential to maintain a healthy environment for all living organisms.
Some of these like bacteria and spores we can only see with a microscope. Many of the larger ones we see, we interact with them, we can count and study them and of course there are the ones we like, the cuddly, cute funny ones and the one that taste good. We have learned how to breed and domesticate animals and plants and keep them in such numbers that they seem safe from any threat of extinction. For example, cattle, sheep and chickens do not appear to be in danger of extinction as we breed them in their millions, but their existence depends on us. Nevertheless, the situation for many wild species of flora and fauna in the wild is becoming increasingly desperate. Read more
The Wood-Wide Web: The natural living internet system
Next
time you go out for a walk in the woods be careful where you tread
because underneath your feet connecting tree to tree, plant to plant,
lies a remarkable living network that allows the exchange of information
between between individual plants. This network allows the flora of
the forest to send and receive information over distances from plant to
plant, connecting a large and varied population of individuals
together. In fact, this remarkable network is itself alive and is a web
of fungi that grows on the roots of trees and plants connecting them
together allowing them to communicate and to even send assistance to
each other. More sinisterly, it also gives some of the plants and
trees connected to the network the ability to commit types of "crime"
against other members. It sounds very similar to the modern global
communications system of the internet. In fact it is a living network
of fungi and has been called the Earth's natural internet and many scientists refer to it as The Wood-Wide Web.
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| Porcini or cep (Boletus edulis) - by CC BY-SA 4.0 |
Fungal connections
We usually think of fungi as mushrooms, toadstools and mould, but these are actually the visible parts called fruits that are above ground that we see. Below ground lies a web of fine threads called mycelium. These threads run from root to root, and plant to plant, linking the roots of a multitude of different plants. Sometimes plants several meters distant are linked creating a living mesh that can conduct information and nutrients to other members of the web. It gives them the ability to help each other out, but it can also use it for darker purposes, such as sabotage, or "chemical warfare," and other types of "cyber-crime." Read more
An introduction to forest gardening
A forest garden is a managed, low-maintenance,
sustainable way to produce food and useful products and designed to be
beneficial to the environment while serving the needs of humans. It can
be part of a permaculture
design system for producing food and other useful materials, or can be
grown as a separate system. Many ideas used in permaculture are used
in the design of a forest garden.
Creating a forest garden
To create a sustainable forest garden considerable a vision of the future and a willingness to work for the benefit future generations of humanity is essential. A well designed forest garden created from scratch does takes a lot of work, a large number of plants and a considerable time for those plants to become established.
When they do become established they can provide a durable and sustainable system for producing food and other materials that humans require for many generations to come. Importantly, being largely self-sustaining with very low maintenance needs and when viewed in the long-term forest gardens make excellent and productive investments while providing food and products for the benefit of humans in a very eco-friendly way. Read more
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| Robert Hart in his forest garden, July 1997 - CC BY-SA 3.0 |
To create a sustainable forest garden considerable a vision of the future and a willingness to work for the benefit future generations of humanity is essential. A well designed forest garden created from scratch does takes a lot of work, a large number of plants and a considerable time for those plants to become established.
When they do become established they can provide a durable and sustainable system for producing food and other materials that humans require for many generations to come. Importantly, being largely self-sustaining with very low maintenance needs and when viewed in the long-term forest gardens make excellent and productive investments while providing food and products for the benefit of humans in a very eco-friendly way. Read more
The Nasa Skylab Program
Skylab was America’s first experimental space station. It was launched by NASA who were also responsible for its operation.
According to NASA there were two main objectives that they wanted to achieve with it. Firstly, they wanted to prove that
humans could, live, work and operate in space for long periods of time.
Secondly they wanted to extend their knowledge of solar astronomy
beyond the limited observations that could be obtained from earth. To
achieve these objectives it needed to be designed and built to greatly
surpass the working duration of previous missions. Read more
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| Skylab 3 - NASA - Public Domain |
How humans evolved blue eyes
Human eyes range in color from very dark brown to the palest of blue and is affected by the amounts of a pigment called melanin in the iris. The perception of eye color can also be affected by the prevailing light conditions and the local environment. At Copenhagen University researchers have done a lot of thinking and a lot of research on where people got their blue eyes from and come up with an answer and published their findings in Journal of Human Genetics.
According to their research, a gene in the chromosome known as OCA2 under went a mutation and can be traced back to one of our ancestors who lived in that region at that time. The researchers say that before this event every one in the world had brown eyes. Read more
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| A blue human eye - by CC BY-SA 3.0 |
They have discovered that blues eyes are the result of a single mutation that happened to one person who probably lived some where in what is now Romania around the Black Sea region, around 6,000 to 10,000 years ago. This means that all blue-eyed people in the world today are genetically related to that person and each other.
According to their research, a gene in the chromosome known as OCA2 under went a mutation and can be traced back to one of our ancestors who lived in that region at that time. The researchers say that before this event every one in the world had brown eyes. Read more
Early settlers to Britain
The question of when Britain was first settled by humans
has been the subject of ongoing debate and research for many years.
Exciting new discoveries have changed the assumptions of experts
leading them to conclude that Britain was possibly settled much earlier
than had previously been thought.
Along the coasts of Norfolk and Suffolk ongoing investigations into an extraordinary cluster of Palaeolithic sites has revealed evidence of human activity going back to around 900,000 years. This is nearly double the earlier estimates and new research is beginning to shed new light on these early settlers.
The peninsula of Britain
Although Britain is famous for being an island today it has not always been one. In fact until about 8,500 years ago it was a part of a wide peninsula jutting out of the north-west of Europe. During this time migrating animals and humans had easy access to it. Even so, it was not an easy place for humans to settle. At that time the local climate swung from being warm and Mediterranean-like to cold polar conditions. Warm periods when humans could gain a foothold on the peninsula were followed by ice ages that forced them off. There were 8 - 9 periods of warmth where humans settled on the peninsula but each period was followed by an ice age which forced them to abandon it. About 12,500 years ago the ice finally receded and waves of pioneering settlers moved onto the peninsula establishing permanent. Read more
Along the coasts of Norfolk and Suffolk ongoing investigations into an extraordinary cluster of Palaeolithic sites has revealed evidence of human activity going back to around 900,000 years. This is nearly double the earlier estimates and new research is beginning to shed new light on these early settlers.
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| Happisburgh during the Early Pleistocene - by CC BY 4.0 |
The peninsula of Britain
Although Britain is famous for being an island today it has not always been one. In fact until about 8,500 years ago it was a part of a wide peninsula jutting out of the north-west of Europe. During this time migrating animals and humans had easy access to it. Even so, it was not an easy place for humans to settle. At that time the local climate swung from being warm and Mediterranean-like to cold polar conditions. Warm periods when humans could gain a foothold on the peninsula were followed by ice ages that forced them off. There were 8 - 9 periods of warmth where humans settled on the peninsula but each period was followed by an ice age which forced them to abandon it. About 12,500 years ago the ice finally receded and waves of pioneering settlers moved onto the peninsula establishing permanent. Read more
Gemstones: Amethysts
Amethysts are a purple type of quartz and regarded as the
most valuable member of the quartz family of precious stones. The
color must be purple though it can vary in hue and shade from mauve,
lavender, light lilac, to a deep purple. The finest quality amethysts
are a medium deep purple with flashes of rose color.
The color of amethysts
Amethysts can be found in geodes and in areas of alluvial deposits. Amethysts are formed in clear quartz where manganese is present. The depth of purple color results from how much iron is present. The Mohs scale of hardness scales the hardness of precious stone and amethyst is classed as 7 on this scale. Read more
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Amethysts can be found in geodes and in areas of alluvial deposits. Amethysts are formed in clear quartz where manganese is present. The depth of purple color results from how much iron is present. The Mohs scale of hardness scales the hardness of precious stone and amethyst is classed as 7 on this scale. Read more
Designing a forest garden
A well designed forest garden can be a productive and important part of a Permaculture, or low-impact living system,providing food or other useful products in an environmentally friendly and sustainable way.
A young natural forest is a highly productive and self-sustaining eco-system so in forest garden design the essential principle are to reproduce those attributes for human benefit. Although a natural wild forest may look tangled and the trees placed randomly and haphazardly there is an inherent structure that helps to give it such great productivity. Because different species of trees and plants grow to different heights a natural vertical structure to the forest evolves.
In forest garden design this is known as ‘layering’ and sometimes these layers are referred to as ‘storeys’ or ‘stacks.’ This layering can often be seen best at the edges of forests where the height of the trees, shrubs, grasses and other plants diminish in size. Read more
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| Forest garden diagram by Graham Burnett - CC BY-SA 3.0 |
A young natural forest is a highly productive and self-sustaining eco-system so in forest garden design the essential principle are to reproduce those attributes for human benefit. Although a natural wild forest may look tangled and the trees placed randomly and haphazardly there is an inherent structure that helps to give it such great productivity. Because different species of trees and plants grow to different heights a natural vertical structure to the forest evolves.
In forest garden design this is known as ‘layering’ and sometimes these layers are referred to as ‘storeys’ or ‘stacks.’ This layering can often be seen best at the edges of forests where the height of the trees, shrubs, grasses and other plants diminish in size. Read more
Ancient high-altitude human settlements
Newly
discovered archaeological sites 2.8 miles (4,500 metres) above sea
level, high in the Andes mountains of Peru, have shed new light on the
altitudes that archaeologists thought was possible for humans to create
permanent settlements. These new discoveries have surprised
archaeologists who had previously considered it impossible for humans to
settle at such high altitudes. The existence of the sites at such
altitudes reveals that humans managed to adapt to such harsh
environments much earlier than had previously been thought.
High-altitude living
A study published in the magazine Science (24 October 2014) reveals that an archaeological team has discovered artefacts and stone buildings decorated with art works which the researchers say are evidence of continued human settlement at high-altitudes. Kurt Rademaker of the University of Maine, the lead author of the report said, "There are many sites of this age at lower elevations in the Andes, and of course there are older sites [at lower elevations] elsewhere in the world, but there is nothing this old at this elevation."
At such a high altitude the environment would be exceptionally harsh and difficult to live in. Settlers would have to cope with cold temperatures, high solar radiation and low oxygen and the researchers are not sure how they managed to survive in such inhospitable places. Some experts think that the settlers may have genetically adapted to the conditions over thousands of years. Read more
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| Andes Mountains, South America by David Adam Kess - CC BY-SA 3.0 |
High-altitude living
A study published in the magazine Science (24 October 2014) reveals that an archaeological team has discovered artefacts and stone buildings decorated with art works which the researchers say are evidence of continued human settlement at high-altitudes. Kurt Rademaker of the University of Maine, the lead author of the report said, "There are many sites of this age at lower elevations in the Andes, and of course there are older sites [at lower elevations] elsewhere in the world, but there is nothing this old at this elevation."
At such a high altitude the environment would be exceptionally harsh and difficult to live in. Settlers would have to cope with cold temperatures, high solar radiation and low oxygen and the researchers are not sure how they managed to survive in such inhospitable places. Some experts think that the settlers may have genetically adapted to the conditions over thousands of years. Read more
The Amesbury Archer and his Companion
The discovery of an early Bronze Age burial site in
Amesbury, near Stonehenge in Wiltshire, caused much excitement with
archaeologists. The remains of two males were found and dubbed the
Amesbury Archer and his Companion. They were found at a new housing development in 2002 by Wessex Archaeology. These finds have helped
archaeologists built a better picture of the society in the Stonehenge
area of Britain during the Bronze Age. They have provided evidence of
early metal working and intriguing insights into the movement of people
during the Bronze Age.
The Beaker Culture
In doing, so archaeologists have discovered new and important evidence of Beaker Culture society in Britain and Europe that is surprising and intriguing. Archaeologists had thought that the Beaker people had been invaders to Britain from continental Europe. They are named after the shape of the pottery drinking cups they made which were found in many burial sites of that time.
Today many experts think that the Beaker culture was a spreading of commerce and culture rather than an invasion. The finding of the Archer provides evidence that people, goods, new ideas and skills did move from Europe to Britain. Read more
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| Stonehenge - by CC BY-SA 4.0 |
In doing, so archaeologists have discovered new and important evidence of Beaker Culture society in Britain and Europe that is surprising and intriguing. Archaeologists had thought that the Beaker people had been invaders to Britain from continental Europe. They are named after the shape of the pottery drinking cups they made which were found in many burial sites of that time.
Today many experts think that the Beaker culture was a spreading of commerce and culture rather than an invasion. The finding of the Archer provides evidence that people, goods, new ideas and skills did move from Europe to Britain. Read more
The Boscombe Bowmen: Another Stonehenge Mystery!
In 2003, while digging a trench for a new water pipe a
Beaker burial from the Bronze Age was discovered. Most Bronze Age
burials found to date have contained only one or two occupants but
unusually this was a mass burial containing the remains of seven
people.
The full story of this group of people may never be known but their discovery has thrown new light on the transportation of the bluestones from Wales to Stonehenge. It also reveals new knowledge of the movement and migration of people during the Bronze Age and the spread of commerce around Britain and from Europe.
A group burial
Wessex Archaeology examined the burial and reported that the remains of those found belonged to three adult males, one teenage male and three children. The oldest occupant was a man who was buried with his head to the north, on his side, with his legs curled up.
He had suffered a terrible injury to his left thighbone which had been broken and may have healed to be shorter than the right. It is not known how long he had carried the injury but he had survived to walk with a limp and was thought to be 30 to 45 years of age when he died. Read more
The full story of this group of people may never be known but their discovery has thrown new light on the transportation of the bluestones from Wales to Stonehenge. It also reveals new knowledge of the movement and migration of people during the Bronze Age and the spread of commerce around Britain and from Europe.
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| Stonehenge by Joe Dorward - Public Domain |
Wessex Archaeology examined the burial and reported that the remains of those found belonged to three adult males, one teenage male and three children. The oldest occupant was a man who was buried with his head to the north, on his side, with his legs curled up.
He had suffered a terrible injury to his left thighbone which had been broken and may have healed to be shorter than the right. It is not known how long he had carried the injury but he had survived to walk with a limp and was thought to be 30 to 45 years of age when he died. Read more
The North American Lynx (Lynx canadensis)
The North American lynx is the largest species of lynx. They are members of the cat family and
one of the bigger North American felines though not as large as the
cougar.
Four species of lynx
There are four recognised species of lynx world wide. The North American lynx, or Canadian lynx, as it is also known, inhabits Canada, and parts of the USA. The bobcat is found in forests across North America. The Eurasian lynx is found in parts of Europe and much of Asia, and the Iberian lynx of southern Spain. Read more
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| Canada lynx by CC BY 2.0 |
There are four recognised species of lynx world wide. The North American lynx, or Canadian lynx, as it is also known, inhabits Canada, and parts of the USA. The bobcat is found in forests across North America. The Eurasian lynx is found in parts of Europe and much of Asia, and the Iberian lynx of southern Spain. Read more
The American Mountain Lion (Felis concolor)
The American mountain lion is a power and
adaptable predator whose range covers much of the Americas. It is a member of the Felidae family and is
native to North and South America. It is also
known by the names of cougar, puma, panther, catamount and other names, depending
on the country and region it is found
A large and solitary cat
Indeed, in the Western Hemisphere this big cat has a far greater range than any other wild land animal ranging from the Yukon, in Canada, down to the southern Andes of South America. A large cat and solitary by nature, after the Jaguar, it is the second heaviest cat in the Americas and the joint fourth in the world with the leopard, following the tiger, lion and jaguar, though it is nearer in relationship to the smaller big cats. Read more
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| Mountain lion - Public Domain |
A large and solitary cat
Indeed, in the Western Hemisphere this big cat has a far greater range than any other wild land animal ranging from the Yukon, in Canada, down to the southern Andes of South America. A large cat and solitary by nature, after the Jaguar, it is the second heaviest cat in the Americas and the joint fourth in the world with the leopard, following the tiger, lion and jaguar, though it is nearer in relationship to the smaller big cats. Read more
The African Crested Porcupine (Hystrix africaeaustralis)
The African crested porcupine is usually found in rocky,
hill country but they are very adaptable animals who make their home
in most types of environment, though there are a few exceptions.
Although they have been found at altitudes of 11,480 feet on Mount
Kilimanjaro, they are not found in dry, empty deserts or damp forests.
The largest rodent in Africa
This porcupine is the heaviest and largest rodent found in Africa. They have roundish heads, small eyes and ears and a blunt, stubby muzzle. Their legs are short and strong and there are five toes on each foot with powerful claws. Read more
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| African crested Porcupine - Drew Avery - CC BY 2.0 |
This porcupine is the heaviest and largest rodent found in Africa. They have roundish heads, small eyes and ears and a blunt, stubby muzzle. Their legs are short and strong and there are five toes on each foot with powerful claws. Read more
How birds learned how to fly
The question of how birds evolved the ability to fly has
been an ongoing debate for centuries. To try and answer this question
we will first discuss reasons why birds fly. Then we will look at four
different theories that have emerged to attempt to explain how birds
took to the skies. Finally, we will briefly discuss what, if any,
expert consensus there is about how birds evolved the ability to fly.
Powered flight takes up a
lot of energy and many large species use air currents and updrafts to
glide and soar so they do not have to flap their wings. This is a good
way for them to save energy. But if flying takes up so much energy why
use it at all? Read more
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| A roseate tern - US FWS - Public Domain |
Bighorn Sheep
Bighorn sheep originated in Siberia
crossing the Bering land bridge connecting Siberia to North America.
They were once numbered in their millions but by 1900 they had
diminished to several thousand in population.
Three distinct species of bighorn sheep
Genetic testing in recent times has identified three distinct species of bighorn sheep in Siberia and North America. They are Ovis Canadensis, Ovis dalli, and Ovis nivicola, or the Siberian Snow sheep. Of these there are several subspecies which include the Rocky Mountains bighorn sheep and the Sierra Nevada bighorn sheep. Read more
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| Big Horn Sheep, Jack Barrie by Oregon Department of Transportation - CC BY 2.0 |
Genetic testing in recent times has identified three distinct species of bighorn sheep in Siberia and North America. They are Ovis Canadensis, Ovis dalli, and Ovis nivicola, or the Siberian Snow sheep. Of these there are several subspecies which include the Rocky Mountains bighorn sheep and the Sierra Nevada bighorn sheep. Read more
Cool African Elephants!
The world's largest land mammal is the African elephant.
Africans are slightly greater in size than Asian elephants and have
larger ears that actually look like the shape of the African continent
as shown on a map. The ears of Asian elephants are rounder and smaller.
How elephants keep cool
In the hot African climate it is often necessary to cool down. Elephants love water and use their trunks to suck up water and spray over their bodies. They then spray a dust over their skin which helps to protect against the sun.
The trunk of an elephant is very versatile with around 100,000 different muscles and has multiple uses. On the end of the trunk can be found to small limbs like fingers that help with grasping and holding. It is also used to smell, drink and breathe.
African elephants; male and female, also have tusks which they use for stripping bark from trees, and digging for food and water. They are also used by males as weapons when fighting. Read more
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| African Forest elephants - Author: Thomas Breuer - CC BY 2.5 |
In the hot African climate it is often necessary to cool down. Elephants love water and use their trunks to suck up water and spray over their bodies. They then spray a dust over their skin which helps to protect against the sun.
The trunk of an elephant is very versatile with around 100,000 different muscles and has multiple uses. On the end of the trunk can be found to small limbs like fingers that help with grasping and holding. It is also used to smell, drink and breathe.
African elephants; male and female, also have tusks which they use for stripping bark from trees, and digging for food and water. They are also used by males as weapons when fighting. Read more
The Rough-legged hawk (Buteo lagopus)
The Rough-legged hawk (Buteo lagopus), is also known as
the Rough-legged buzzard and is so called because its legs are
completely feathered. This is thought to help protect from rodent bites
when it catches prey. Similar species to the Rough-legged hawk
include the Red-tailed hawk, Turkey vulture, Northern harrier, and the
Ferruginous hawk.
Habitat
In the summer the Rough-legged hawk is found in the tundra and and taiga of the northern parts of North America and Eurasia. In winter it favors marshes, prairies and agricultural regions of Eurasia and North America. Read more
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| Rough-legged Hawk - CC BY-SA 3.0 |
In the summer the Rough-legged hawk is found in the tundra and and taiga of the northern parts of North America and Eurasia. In winter it favors marshes, prairies and agricultural regions of Eurasia and North America. Read more
Thursday, 30 April 2015
How forests are important to the planet
When we think of a forest we usually think of a great mass of tangled trees and vegetation growing vertically. It can be that, yet there are many other different kinds of forest and many definitions. There are also kelp forests that grow under the sea, but this article looks at the different kinds of land forests and their importance to the global ecosystem. We will look at how a forest is defined, the forest community, biodiversity and the forest economy. Then discuss the forest as a storehouse, the forest as the "Earth’s lungs" and as an ecosystem, followed by a look at the different types of forest. Finally we will conclude by looking at human understanding of the forests.
The United Nations Food and Agriculture Organization definition of a forest includes, tree plantations whose main purpose is to supply timber, or wood derived products. It does not include tree plantations grown to supply products such as fruit and coconuts for example and neither does it include agroforestry, urban parks and gardens. Areas of trees of over five hectares are included. Landscapes where there are a substantial number of small patches of forestry in the terrain and small areas of woods, or spinneys, are also included, though they are difficult to identify and monitor, yet can range over significant areas. Read more
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| Garibaldi Provincial Park, British Columbia - Author: TheSimkin (talk · contribs) - Public Domain |
The United Nations Food and Agriculture Organization definition of a forest includes, tree plantations whose main purpose is to supply timber, or wood derived products. It does not include tree plantations grown to supply products such as fruit and coconuts for example and neither does it include agroforestry, urban parks and gardens. Areas of trees of over five hectares are included. Landscapes where there are a substantial number of small patches of forestry in the terrain and small areas of woods, or spinneys, are also included, though they are difficult to identify and monitor, yet can range over significant areas. Read more
Rainbow Trout (Oncorhynchus mykissare)
Rainbow trout (Oncorhynchus mykissare),
members of the salmon family and are also called redband trout, or
steelheads. They are native to the lakes and rivers between the Pacific
Ocean and the Rocky Mountains on the North American continent.
Fly-fishermen admire their spirit
They are very sought after by fly-fishermen who admire their fighting spirit finding them challenging opponents. When hooked they can leap out of the water spectacularly and perform long powerful runs attempting to break free. They can leap three or four times their body length with ease and can accelerate to a speed of 23 mph in about 1 second from a dead start. Read more
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| Rainbow Trout - Knepp, Timothy - U.S. Fish and Wildlife Service - Public Domain |
They are very sought after by fly-fishermen who admire their fighting spirit finding them challenging opponents. When hooked they can leap out of the water spectacularly and perform long powerful runs attempting to break free. They can leap three or four times their body length with ease and can accelerate to a speed of 23 mph in about 1 second from a dead start. Read more
Green eyes!
Green eyes in humans and are considered by many people to be very beautiful, very mysterious and very alluring. But why do people have different eye coloring and what is that puts the ‘green’ into green eyes?
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| Imagen de un ojo color verde - by |
Around the world
It is known that there were humans with green eyes thousands of years ago in Siberia during the Bronze Age. Green eyes are more common in Europe and with people of European ancestry. In some European countries people with green eyes out number those with brown. Around 80% of people in Iceland have green or blue eyes. Green eyes are more often found in females than males in Iceland and this is also a worldwide trait. Green-eyed people can be found all around the world though they are generally of Germanic or Celtic descent. Read more
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