Spotlights

How the Zebra got its Stripes
April 7, 2014 09:27 AM - ENN Staff

Why zebras have black and white stripes is a question that has intrigued scientists and spectators for centuries. Evolutionary theories include a form of camouflage, a mechanism of heat management, and disrupting predatory attack by confusing carnivores. In order to better understand the black and white stripe evolution, a research team led by the University of California, Davis, has now examined this riddle systematically, and what they found is that biting flies, including horseflies and tsetse flies, play a major role as the evolutionary driver for zebra stripes. The team mapped the geographic distributions of the seven different species of zebras, horses and asses, and of their subspecies, noting the thickness, locations, and intensity of their stripes on several parts of their bodies. Their next step was to compare these animals' geographic ranges with different variables, including woodland areas, ranges of large predators, temperature, and the geographic distribution of glossinid (tsetse flies) and tabanid (horseflies) biting flies. They then examined where the striped animals and these variables overlapped.

How the Zebra got its Stripes
April 7, 2014 09:27 AM - ENN Staff

Why zebras have black and white stripes is a question that has intrigued scientists and spectators for centuries. Evolutionary theories include a form of camouflage, a mechanism of heat management, and disrupting predatory attack by confusing carnivores. In order to better understand the black and white stripe evolution, a research team led by the University of California, Davis, has now examined this riddle systematically, and what they found is that biting flies, including horseflies and tsetse flies, play a major role as the evolutionary driver for zebra stripes. The team mapped the geographic distributions of the seven different species of zebras, horses and asses, and of their subspecies, noting the thickness, locations, and intensity of their stripes on several parts of their bodies. Their next step was to compare these animals' geographic ranges with different variables, including woodland areas, ranges of large predators, temperature, and the geographic distribution of glossinid (tsetse flies) and tabanid (horseflies) biting flies. They then examined where the striped animals and these variables overlapped.

How the Zebra got its Stripes
April 7, 2014 09:27 AM - ENN Staff

Why zebras have black and white stripes is a question that has intrigued scientists and spectators for centuries. Evolutionary theories include a form of camouflage, a mechanism of heat management, and disrupting predatory attack by confusing carnivores. In order to better understand the black and white stripe evolution, a research team led by the University of California, Davis, has now examined this riddle systematically, and what they found is that biting flies, including horseflies and tsetse flies, play a major role as the evolutionary driver for zebra stripes. The team mapped the geographic distributions of the seven different species of zebras, horses and asses, and of their subspecies, noting the thickness, locations, and intensity of their stripes on several parts of their bodies. Their next step was to compare these animals' geographic ranges with different variables, including woodland areas, ranges of large predators, temperature, and the geographic distribution of glossinid (tsetse flies) and tabanid (horseflies) biting flies. They then examined where the striped animals and these variables overlapped.

La contaminación del aire es ahora el más grande riesgo ambiental en el mundo.
April 2, 2014 07:20 PM - ENN Editor

La Organización Mundial de la Salud ha publicado hoy los datos de mortalidad del 2012, estimando que alrededor de 7 millones de personas (una de cada ocho personas) murieron en todo el mundo ese año como resultado de la exposición a la contaminación del aire. Este resultado de más del doble de las estimaciones anteriores confirma que la contaminación atmosférica es ahora el riesgo de salud ambiental más grande del mundo. En particular, los nuevos datos revelan un vínculo más fuerte entre la exposición a contaminación del aire, tanto al aire libre como en interiores, en enfermedades cardiovasculares tales como ataques al corazón y la cardiopatía isquémica, así como entre la contaminación atmosférica y el cáncer. Esto se suma al papel de la contaminación atmosférica en el desarrollo de enfermedades respiratorias como infecciones respiratorias agudas y enfermedades pulmonares obstructivas crónicas.

Air pollution, now the world’s single largest environmental risk
March 25, 2014 03:19 PM - ENN Editor

The World Health Organization today released mortality data from 2012 estimating that around 7 million people (one person in eight) died globally that year as a result of air pollution exposure. This finding more than doubles previous estimates and confirms that air pollution is now the world’s largest single environmental health risk.

Air pollution, now the world’s single largest environmental risk
March 25, 2014 03:19 PM - ENN Editor

The World Health Organization today released mortality data from 2012 estimating that around 7 million people (one person in eight) died globally that year as a result of air pollution exposure. This finding more than doubles previous estimates and confirms that air pollution is now the world’s largest single environmental health risk.

Air pollution, now the world’s single largest environmental risk
March 25, 2014 03:19 PM - ENN Editor

The World Health Organization today released mortality data from 2012 estimating that around 7 million people (one person in eight) died globally that year as a result of air pollution exposure. This finding more than doubles previous estimates and confirms that air pollution is now the world’s largest single environmental health risk.

Air pollution, now the world’s single largest environmental risk
March 25, 2014 03:19 PM - ENN Editor

The World Health Organization today released mortality data from 2012 estimating that around 7 million people (one person in eight) died globally that year as a result of air pollution exposure. This finding more than doubles previous estimates and confirms that air pollution is now the world’s largest single environmental health risk.

Air pollution, now the world’s single largest environmental risk
March 25, 2014 03:19 PM - ENN Editor

The World Health Organization today released mortality data from 2012 estimating that around 7 million people (one person in eight) died globally that year as a result of air pollution exposure. This finding more than doubles previous estimates and confirms that air pollution is now the world’s largest single environmental health risk.

Air pollution, now the world’s single largest environmental risk
March 25, 2014 03:19 PM - ENN Editor

The World Health Organization today released mortality data from 2012 estimating that around 7 million people (one person in eight) died globally that year as a result of air pollution exposure. This finding more than doubles previous estimates and confirms that air pollution is now the world’s largest single environmental health risk.

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