寄生虫,斑尾鸽 z-bo 2020-08-17 599

　　Researchers led by the University of California, Davis, University of California, Davis, and the California Department of Fish and Wildlife have discovered a new pathogen. Scientists have studied the mortality of Native American pigeons.

　　Three pigeons living in Santa Barbara County. Researchers from the University of California Davis and the Department of Fish and Wildlife at the University of California found that Trichomonas is the main cause of this natural winter death and the decline in the number of this California native migratory bird. Image Courtesy: CourtesyDianneRicky

　　Scientists have been able to link this new and ancient parasite, Gallibacterium spp. to the recent deaths of thousands of pigeons on the Pacific Coast. This type of death has occurred many times in the central coastal areas of California and the Sierra Nevada region. Scientists named this new pathogen Trichomonasst ABLeri. Fowl trichomoniasis is a new and potentially fatal disease that can cause severe damage and block the esophagus, eventually causing birds to eat and drink, block the respiratory tract and cause suffocation. possible. Recently, the damage to the bones of Spinosaurus was called trichomoniasis, which can be traced back to the time when the dinosaurs wandered on the earth. This disease may also cause a decline in the number of passenger pigeons, which were extinct 100 years ago.

　　The epidemic of this disease can kill thousands of poultry in a short period of time. The 2007 Carmel Valley outbreak caused an estimated 43,000 bird deaths.

　　"The parasites that killed Marko pigeons in these outbreaks also killed these birds without an outbreak." He is the first author of the study in veterinary medicine at the University of California, Davis. Said Yvette Girard, a postdoctoral researcher at the University’s Wildlife Health Center. "This indicates that other factors may be related to this death." This is caused by agglomeration or the outflow of other nearby species. "The research team leader, Christine Johnson, said he is a professor at the Wildlife Health Center at the University of California, Davis.

　　Between the winter of 2011 and the spring of 2012, 8 people died. It is defined as the discovery of the carcasses of five or more birds in the same geographic area within the same time frame. The study indicated that 96% of the seven dead birds were confirmed to have trichomoniasis. This disease was also found in the following situations:

　　36% of wild pigeons, 11% of hunters killed

　　4% of the birds are still alive, captured and released. The co-author of the study said: "Because of the low reproduction rate, only one young pigeon per year makes this disease even more troublesome for pigeons. These events occur in winter." said Crystalogers, an environmental scientist at the Fish and Wildlife Department. "This means that almost every bird lost in these events was an adult bird. It was killed before it lost its ability to reproduce in winter."

　　California, at least since 1945. It is reported that the number of pigeons that died of tail feathers has increased in the past ten years, and there have been six outbreaks in the past ten years.

　　Girard said: "We hope that in the course of our research we will find very deadly trichomonas in developing birds." "It is surprising that two birds were killed by these dead birds."

　　The autopsy of these birds was done at the California Institute of Animal Health and Food Safety at the University of California, Davis and the University of California Fish. I broke the Wildlife Institute class and wildlife service.

　　These studies were funded by the California Fish and Wildlife Service and the U.S. Fish and Wildlife Service.