Global biodiversity collapse
[ Will global biodiversity collapse in 2019? ]
A recent study created a dataset of plant temperature tolerances with a median upper tolerance limit of 23.7°C.
This temperature is about 10°C higher than the temperature in the year 1750.
Only during times of mass extinctions were temperatures that high, such as during the PETM, 55.5 million years ago, and the Permian–Triassic extinction event, 252 million years ago, also know as the Great Dying when some 95% of species known from fossils went extinct.
[ image from: How much warmer is it now? ]The study concludes that extinction will already occur far earlier than when upper tolerance levels are reached, as “loss of one species can make more species disappear (a process known as ‘co-extinction’), and possibly bring entire systems to an unexpected, sudden regime shift, or even total collapse.”
There was a small group of species with large tolerance limits and remarkable resistance to environmental change, but even they could not survive co-extinctions. In fact, their extinction was abrupt and happened far from their tolerance limits and close to global biodiversity collapse at around 5°C of heating.
Original Title: As El Niño sets in, will global biodiversity collapse in 2019?
Full Text of the Original Article: http://arctic-news.blogspot.com/2018/11/as-el-nino-sets-in-will-global-biodiversity-collapse-in-2019.html