— the research teased out these details by using 21,946 fossil specimens from areas of nevada in the us and the yukon in canada that were once ancient sea beds to paint a picture of graptolite evolution. the analysis found that as ocean circulation patterns began to shift hundreds of thousands of years before the ordovician extinction, graptolite communities that previously included a rich array of both shallow- and deep-sea species began to lose their diversity and complexity. read article : zooplankton warn us, extinction has a tipping point
— impressively, the real-life food web was the most resilient possible combination of the species alive at the time. in other words, nature’s instruction manual built the most stable systems. read article : who dies and who survives during a mass extinction?
“A final decision on whether to protect sage grouse is due next year and could result in wide-ranging restrictions on oil and gas development, agriculture and other economic activity.” http://www.cbsnews.com/news/gop-to-propose-changing-endangered-species-act/