Why are so many animals dying? More mass death events occurring now than ever before, study claimsThree US institutions say mass die-offs are now more commonThey have increased by one event per year for 70 yearsAlthough not as deadly as an extinction they can kill 90% of a populationReasons include human intervention and climate factorsThe worst cases were the result of multiple causesMass die-offs of certain animals has increased in frequency every year for seven decades, according to a new study.Researchers found that such events, which can kill more than 90 per cent of a population, are increasing among birds, fish and marine invertebrates.The reasons for the die-offs are diverse, with effects tied to humans such as environmental contamination accounting for about a fifth of them.Three US institutions say mass die-offs are now more common. They have increased by one event per year for 70 years. Pictured are dead tilapia floating near Salton Sea Beach in California, US on 19 Januray 11. They were killed by erosion and high toxicity levels from farm runoffThe research was carried out by three US institutions - the University of San Diego, Yale University and the University of California, Berkeley - and published in the Proceedings of the National Academy of SciencesMass mortality events occur when a large percentage of a population dies in a short time frame.While they are rare and fall sort of an extinction, they still pack a devastating punch.MASS MORTALITY EVENTS (MMEs)The analysis of 727 published MMEs from across the globe, affecting 2,407 animal populations, found that the magnitude of such events since 1940 has been intensifying for birds, fishes and marine invertebrates, decreasing for reptiles and amphibians and staying the same for mammals.The most severe events were those with multiple causes, the paper shows.Although mass mortality events are often a natural event 'the most alarming and interesting result was the sheer magnitude of some of these mortality events,' Dr Adam Siepielski of the University of San Diego said.'Billions of individuals dying are just huge numbers to comprehend. The study provides yet another example of the challenges to life that organisms are confronted with on a planet increasingly dominated by the influence of humans in the environment.'READ MORE PLUS SEE ALL PHOTOS@ http://www.dailymail.co.uk/sciencetech/article-2908325/Why-animals-dying-mass-death-events-occurring-study-claims.html

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Movella left a comment on Comment Wall
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