Sentences with phrase «golden eagle predation»
Unfortunately, a number of these have been the victims of continued golden eagle predation, but with January 2007 seeing the removal of all the feral pigs, it is hoped that there will be less motivation for any golden eagles to remain on the island (11).
http://www.arkive.org/
Golden eagle predation was responsible for the massive decline of island foxes on the northern Channel Islands in the 1990s.
During the December «From Shore to Sea» lecture National Park Service Wildlife Biologist, Tim Coonan, discussed the latest efforts to save the endangered island fox following a severe, over 90 % decline in the population caused by golden eagle predation.
In order to mitigate golden eagle predation on island foxes, The Santa Cruz Predatory Bird Research Group, with the support of the Park Service and The Nature Conservancy, trapped and relocated a total of 44 golden eagles, including 10 eaglets born on the islands to distant sites in northeastern California.
Golden eagle predation was unprecedented, and was considered unnatural because golden eagles had not previously bred on the islands and were, until this time, rarely observed.
Golden eagle predation had been responsible for the steep decline of island foxes on the northern Channel Islands in the 1990s.
Golden eagle predation, discovered when foxes were radio - collared and monitored, proved to be the cause of the high mortality rates.
When island fox populations on the northern islands plummeted to the edge of extinction in 1999, Channel Islands National Park and the Nature Conservancy established captive breeding facilities on San Miguel, Santa Rosa and Santa Cruz Islands «as insurance against the loss of foxes from golden eagle predation.»
Not exact matches
On March 5, 2004, four of the six subspecies of island fox endemic to the California Channel Islands were listed as endangered following catastrophic population declines of over 90 percent, due primarily to predation by golden eagles on the northern Channel Islands and a canine distemper outbreak on Santa Catalina Island.
In addition, predation by the golden eagle and human activities devastated fox numbers on several of the Channel Islands in the 1990s.
Additional Threats Predation by golden eagles was the primary mortality factor for foxes on the northern Channel Islands, but there were other threats as well.
Monitoring indicated that, none returned to the islands.5 Today the occasional golden eagle visits the islands, but the level of predation on island foxes is negligible; all three island fox subspecies in the park are recovering rapidly.
The island foxes on San Miguel Island were reduced to only 15 individuals because of predation by golden eagles.
On San Miguel, Santa Rosa and Santa Cruz Islands at Channel Islands National Park, the decline was attributed to predation by golden eagles.
The primary threats causing these devastating declines were predation by golden eagles (Aquila chrysaetos) on the northern Channel Islands, canine distemper virus (CDV) on Santa Catalina Island, and collision with vehicles on San Clemente and San Nicolas Islands (2)(8).
The decline was due primarily to predation by golden eagles (which had moved in to fill a niche in the ecosystem that had been vacated by loss of bald eagles due to the pesticide DDT) and a canine distemper outbreak on Santa Catalina Island.