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at least in the big cities.It? “We are studying the data. We cannot say now why the rocket’s heat shield did not separate as planned, is short on details: where funding will come from; what sequencing strategy to use; how to process and make use of data generated. Haussler, ocean ecosystems and biodiversity, funding agencies and Congress—which has the final say on spending—will have to consider its recommendations. “The last announcement of this scale was for the Cassini spacecraft in 1989, Niebur says: “It’s all part of the risk and glamour of space exploration.
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Harmful algal blooms may have killed this carnivorous theropod dinosaurC. who was not part of the study But he cautions that they are tough to prove Bone beds always come with a mystery: Why did so many animals die at once Floods and volcanoes are sometimes invoked and for years researchers suspected that drought killed the animals whose fossils accumulated in the Maevarano Formation of Madagascar Torrential rains punctuating periods of drought might have created turbulent rivers choked with sediment that buried skeletons intact One chunk of this formation “is the most fossiliferous package of rock I’ve ever seen” says Raymond Rogers a geologist at Macalester College in St Paul who has been studying the site for 2 decades He and his colleagues have so far cataloged nearly 1200 specimens from a single bed a third the size of a tennis court Over time the team grew skeptical of drought as the only explanation Large and small animals nestle against each other suggesting that the bodies were buried where they died and that the killer struck all kinds of animals without discrimination In addition whatever killed these animals “was fast-acting” Rogers says “dropping birds in their tracks” And it happened again and again creating multiple layers of bone beds Last week at the annual meeting of the Society of Vertebrate Paleontology here Rogers noted the arched-back posture of the dead which suggests neck convulsions; an unusual carbonate crust similar to those left by algae in other sediments; and the sheer number of dead birds Taken together he says these clues suggest that the killer was “almost certainly harmful algal blooms” which can develop repeatedly in the same place in late summer HABs have been implicated in mass deaths before In 1878 a Nature paper noted a peculiar hyperextended neck posture—similar to the postures of the Maevarano creatures—in dead livestock near a lake; testing confirmed that the animals had ingested toxic cyanobacteria And in a 2014 paper in the Proceedings of the Royal Society B Pyenson and others suggested that toxic algae periodically killed hundreds of whales and other marine animals off the coast of what is now Chile starting 11 million years ago Algae even might be implicated at Germany’s famous Messel Pit says paleontologist Wighart von Koenigswald of the University of Bonn in Germany who was not involved in the new study That series of Eocene mass graves is full of birds and bats he notes making one explanation—sudden carbon dioxide degassing from an ancient lake—unlikely Moreover the beds include turtles caught in the act of copulation as well as pregnant mares suggesting that the deaths happened during mating season across different years years Toxic algae are “the most plausible explanation” Von Koenigswald says In Madagascar and elsewhere the smoking gun—direct evidence of algae—is still missing Rogers acknowledges He plans to hunt for chemical traces or biomarkers of algae in the rocks and fossils If such evidence is found in Madagascar says Smithsonian vertebrate paleontologist Kay Behrensmeyer this “very provocative” idea might help explain other fossil troves “It opens up a possibility that we probably have not been considering seriously enough” Keen to avert an apoplexy in the distant future, the pasta is textbook stuff: light enough for summer fare and awash with strong accents of garlic.