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Climate change threatens tropical birds
Date:2/16/2012

ward or to higher elevations, causing problems for other species. Global warming helped rainbow-billed toucans move from Costa Rican lowlands to higher-elevation cloud forests, where they now compete for tree-cavity nest space with the resplendent quetzal. The toucans also eat quetzal eggs and nestlings.

  • Birds with slower metabolisms often live in cooler tropical environments with relatively little temperature variation. They can withstand a narrower range of temperature and are more vulnerable to climate change.

  • Climate change may spread malaria-bearing mosquitoes to higher elevations in places like Hawaii, where the malaria parasite can threaten previously unexposed birds.

  • Longer and less regular dry seasons and droughts expected during global warming may reduce populations of tropical birds that often time their breeding with wet seasons when food is abundant.

    Şekercioğlu acknowledges that "not all effects of climate change are negative, and changes in temperature and precipitation regimes will benefit some species. Nevertheless, climate change will not benefit many species."

    Scenarios for Extinction

    A 2008 study by Şekercioğlu and late climatologist Stephen Schneider calculated 60 scenarios of how tropical land bird extinction rates will be affected by various possible combinations of three variables: climate change, habitat loss and how easily birds can shift their range, meaning move to new habitat. Citing those estimates, the new review paper says that "depending on the amount of habitat loss, each degree of surface warming can lead to approximately 100 to 500 additional bird extinctions."

    The Intergovernmental Panel on Climate Change has predicted 1.1 to 6.4 degrees Celsius (2 to 11.5 degrees Fahrenheit) of global warming of the Earth's surface by the year 2100, which Şekercioğlu's study converted into a best case of about 100 land bird extinctions a
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    • Contact: Lee Siegel
    lee.siegel@utah.edu
    801-581-8993
    University of Utah
    Source:Eurekalert  

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