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   It started in late May.   
      
   When geoecologist Steffen Zuther and his colleagues arrived in   
   central Kazakhstan to monitor the calving of one herd of saigas,   
   a critically endangered, steppe-dwelling antelope, veterinarians   
   in the area had already reported dead animals on the ground.   
      
   "But since there happened to be die-offs of limited extent   
   during the last years, at first we were not really alarmed,"   
   Zuther, the international coordinator of the Altyn Dala   
   Conservation Initiative, told Live Science.   
      
   But within four days, the entire herd — 60,000 saiga — had died.   
   As veterinarians and conservationists tried to stem the die-off,   
   they also got word of similar population crashes in other herds   
   across Kazakhstan. By early June, the mass dying was over. [See   
   Images of the Saiga Mass Die-Off]   
      
   Now, the researchers have found clues as to how more than half   
   of the country's herd, counted at 257,000 as of 2014, died so   
   rapidly. Bacteria clearly played a role in the saigas' demise.   
   But exactly how these normally harmless microbes could take such   
   a toll is still a mystery, Zuther said.   
      
   "The extent of this die-off, and the speed it had, by spreading   
   throughout the whole calving herd and killing all the animals,   
   this has not been observed for any other species," Zuther said.   
   "It's really unheard of."   
      
   Crucial steppe players   
      
   Saigas play a critical role in the ecosystem of the arid   
   grassland steppe, where the cold winters prevent fallen plant   
   material from decomposing; the grazing of the dog-size, Gonzo-   
   nosed antelopes helps to break down that organic matter,   
   recycling nutrients in the ecosystem and preventing wildfires   
   fueled by too much leaf litter on the ground. The animals also   
   provide tasty meals for the predators of the steppe, Zuther   
   said. [Images: Ancient Beasts of the Arctic]   
      
   "Where you find saiga, we recognize also that the other species   
   are much more abundant," Zuther told Live Science.   
      
   Saigas, which are listed as critically endangered by the   
   International Union for the Conservation of Nature, live in a   
   few herds in Kazakhstan, one small herd in Russia and a herd in   
   Mongolia. The herds congregate with other herds during the cold   
   winters, as well as when they migrate to other parts of   
   Kazakhstan, during the fall and spring. The herds split up to   
   calve their young during the late spring and early summer. The   
   die-off started during the calving period.   
      
   Die-offs of saigas, including one that felled 12,000 of the   
   stately creatures last year, have occurred frequently in recent   
   years. But the large expanse of the country affected by last   
   year's die-off meant veterinarians couldn't get to the animals   
   until long after their deaths. The delay hindered any   
   determination of a cause of death, and researchers eventually   
   speculated that an abundance of greenery caused digestion   
   problems, which led to bacterial overgrowth in the animals' guts.   
      
   Detailed analysis   
      
   This time, field workers were already on the ground, so they   
   were able to take detailed samples of the saigas' environment —   
   the rocks the animals walked on and the soil they crossed — as   
   well as the water the animals drank and the vegetation they ate   
   in the months and weeks leading up to the die-off. The   
   scientists also took samples of the ticks and other insects that   
   feed on saiga, hoping to find some triggering cause.   
      
   The researchers additionally conducted high-quality necropsies   
   of the animals, and even observed the behavior of some of the   
   animals as they died. The females, which cluster together to   
   calve their young, were hit the hardest. They died first,   
   followed by their calves, which were still too young to eat any   
   vegetation. That sequence suggested that whatever was killing   
   off the animals was being transmitted through the mothers' milk,   
   Zuther said.   
      
   Tissue samples revealed that toxins, produced by Pasteurella and   
   possibly Clostridia bacteria, caused extensive bleeding in most   
   of the animals' organs. But Pasteurella is found normally in the   
   bodies of ruminants like the saigas, and it usually doesn't   
   cause harm unless the animals have weakened immune systems.   
      
   Genetic analysis so far has only deepened the mystery, as the   
   bacteria found were the garden-variety, disease-causing type.   
      
   "There is nothing so special about it. The question is why it   
   developed so rapidly and spread to all the animals," Zuther said.   
      
   Mystery endures   
      
   A similar mass die-off of 400,000 saigas occurred in 1988, and   
   veterinarians reported similar symptoms. But because that die-   
   off occurred during Soviet times, researchers simply listed   
   Pasteurellosis, the disease caused by Pasteurella, as the cause   
   and performed no other investigation, Zuther added.   
      
   So far, the only possible environmental cause was that there was   
   a cold, hard winter followed by a wet spring, with lots of lush   
   vegetation and standing water on the ground that could enable   
   bacteria to spread more easily, Zuther said. That by itself   
   doesn't seem so unusual, though, he said.   
      
   Another possibility is that such flash crashes are inevitable   
   responses to some natural variations in the environment, he   
   said. Zuther said he and his colleagues plan to continue their   
   search for a cause of the die-off.   
      
   https://www.foxnews.com/science/60000-antelopes-died-in-4-days-   
   and-no-one-knows-why   
        
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)