Woolly mammoths once flourished from northern Europe to Siberia. As the last ice age drew to a close some 10,000 years ago, the mainland population perished, victims of climate change and human hunters.
However, a remote island population survived for 6000 years after the mainland had died off. And from a tooth of a male mammoth, geneticists have now deciphered the reason the population ultimately went extinct.
Read about it in the New York Times.
Not figurative dust. Literal dust. Cambodia’s limestone karsts exist nowhere else and are home to a host of endemic species. These environments are being pulverized for cement and scientists are racing to document all the rare plants before they are gone.
Read about it over at the NYTimes!
Given that I studied an abundant snail during my PhD (actually, Potamopyrgus antipodarum is invasive throughout most of the world), this headline was alarming to me.
But like many uncharismatic microfauna, snails are declining in record number across a number of different habitats.
Read about it over at Scientific America, and save the snails!
The endangered Powelliphanta augusta snail of New Zealand Credit: Alan Liefting
It’s often hard to determine the sex of fossils (most of our parts that determine such things are not… fossilizable).
But researchers from North Carolina State University and North Carolina Museum of Natural Sciences found a medullary bone, a kind of tissue found only in female birds that are carrying eggs, or have just finished laying them, in a T-rex fossil from the Cretaceous.
While this is exciting (and you should read about it over at the Washington Post), it may be more exciting as researchers now have a means of identifying sex of dinosaurs. Which allows us to find out more about sex-linked traits in extinct dinosaurs.
Some days I just need a pick me up. While others take to the internet and fine photos of kittens telling them to hang in there, I seek the adorable face of the pangolin.
Also known as the spiny anteater, it is the only mammal wholly covered in scales. They resemble artichokes on legs. Oh and they are beyond adorable.
However, all 8 species of pangolins are endangered because they have one more distinction: the worlds most trafficked mammal. Their meat has become a delicacy in vietnam, which has rapidly wiped out populations of pangolins across South East Asia.
Read about their plight over at BBC, and for a little Friday pick me up, enjoy these lovely photos of my favorite mammal.
The New York Times reports that monarch butterflies migrating from North America to central Mexico appear to be doing better than last year, when the over-wintering colony occupied just 1.7 acres. This year’s survey finds the butterflies have filled 2.8 acres, which seems like a solid improvement until you consider that the peak colony size, since record-keeping started, was 44.5 acres.
(Incidentally, 44.5 acres is more than 40 American football fields of forest covered with roosting monarch butterflies.)
The monarchs that migrate to Mexico aren’t the only population — there’s another migratory route on the U.S. Pacific coast, and there are non-migratory populations in Florida, Hawaii, and even New Zealand. But the Mexico overwintering site represents what used to be the single largest monarch population, butterflies that spend summer across most of North America east of the Rocky Mountains. Logging in Mexico and the loss of summer habitat to farming in the Midwest has been hitting the butterflies hard for years, and while this rebound is encouraging, it might still make sense to put the monarch on the Endangered Species List, as the U.S. Fish and Wildlife Service is considering.
The American chestnut used to be one of the most common trees in North American hardwood forests, providing enormous crops of nuts that supported birds and other wildlife, and a source of robust, rot-resistant lumber for human use. But American chestnuts were nearly wiped out by the introduction of a virulent chestnut blight from Asia.
But now, after years of selective breeding and some careful genetic engineering, biologists at the State University of New York and the American Chestnut Foundation have produced blight-resistant chestnuts and they’re getting ready to start restoring the population with a crowd-funding campaign. If American chestnuts couldn’t evolve to cope with blight on their own, they may be one of the first species to get an evolutionary helping hand from humans.