This means increased temperatures predicted under climate change scenarios would impact greatly on animal behavior. He said these effects could include changing the timing of activities, such as foraging and reproduction, which could have a flow-on effect to "whole ecosystems." Warmer environments may also increase energy costs for the animal while also constraining activity time as they spend more time seeking shade. "Effectively their rent goes up, but the time they've got to find an income goes down," Kearney said. Under the modeling Kearney said it is clear there will be a "mismatch between required and available shade" in regions such as northern Australia and northern Africa, where there is too little shade, and temperate Australia, North America and Europe, which has too much shade. "Human activities such as deforestation are dramatically altering the degree of shading available for thermoregulating ectotherms in tropical regions," the authors wrote in the paper. "Climate change will also alter vegetation cover through processes such as increased carbon dioxide and changed fire frequency." Kearney said the ability of a species to tolerate climate change will be whether it can modify the seasonal timing of activities such as reproduction. "Without such liability, the feasible options to maintain population viability are greatly limited and likely will require substantial evolutionary shifts," he said. Related Links: |
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