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Jeepers creepers: Climate change threatens endangered honeycreepers
Date:5/26/2009

As climate change causes temperatures to increase in Hawaii's mountains, deadly non-native bird diseases will likely also creep up the mountains, invading most of the last disease-free refuges for honeycreepers a group of endangered and remarkable birds.

A just-published U.S. Geological Survey (USGS) review discusses the likelihood of a forthcoming "disease invasion" by examining the present altitudinal range of avian malaria and pox, honeycreeper distribution, and the future projected range of diseases and honeycreeper habitat with climate change.

At one time, the Hawaiian Islands had no mosquitoes and no mosquito-borne diseases. But, by the late 1800s, mosquitoes had set up permanent housekeeping, setting the stage for epidemic transmission of avian malaria and pox. Honeycreepers just like people faced with novel viruses such as swine flu had no natural resistance against these diseases.

Before long, Hawaii's native honeycreepers significantly declined in numbers and geographic range. It was likely that malaria swept rapidly across all of the lower Hawaiian Islands after the disease was introduced, leaving few survivors. Today, native Hawaiian birds face one of the highest rates of extinction in the world. Of 41 honeycreeper species and subspecies known since historic times, 17 are probably extinct, 14 are endangered, and only 3 are in decent shape.

Pox and malaria transmission in Hawaii depends on climatic conditions, especially seasonal changes in temperature and rainfall that increase or decrease mosquito populations. "Without question, the one factor that prevented widespread and rapid extinction of virtually all of Hawaii's native honeycreepers after the introduction of avian pox and avian malaria was the presence of high-altitude disease refuges on Kauai, Maui and Hawaii," said lead study author Dr. Carter Atkinson, a USGS microbiologist based at the USGS Pacific Islands Ecosystems Research Center in Hawaii.'/>"/>

Contact: Carter Atkinson
catkinson@usgs.gov
808-967-8119 x271
United States Geological Survey
Source:Eurekalert

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