Will climate change outpace species adaptation?
Many species might be left vulnerable in the face of climate change, unable to adapt their physiologies to respond to rapid global warming. According to a team of international researchers, species evolve heat tolerance more slowly than cold tolerance, and the level of heat they can adapt to has limits.
In a study published in the , 成人VR视频 professor Jennifer Sunday and her co-authors wanted to understand how species鈥� thermal limits have evolved. To examine variation across the tree of life, the researchers developed the largest available database compiling thermal tolerances for all types of organisms ().
The researchers found that first and foremost, a species鈥� thermal tolerance is linked to the current climate where they live. "It鈥檚 logical that thermal limits mostly match a species鈥� present-day climate but tracing the evolutionary history of thermal limits can reveal how species got to be where they are today," says Sunday, an Assistant Professor in the Department of Biology.
The researchers also found that tolerance to cold has evolved much faster than tolerance to heat, particularly in endotherms as compared to ectotherms and plants. Endothermic animals are those that generate metabolic heat to regulate their own body temperature 鈥� for example, mammals and birds 鈥� while ectothermic animals are those that regulate their body temperature using external heat sources, like reptiles, fishes and invertebrates.
One cause of this disparity could be that heat tolerance has reached an evolutionary barrier, called an 鈥榓ttractor,鈥� beyond which further evolution is constrained or selected against. 鈥淭his is very concerning because it suggests that the vast majority of species will not be able to adapt fast enough to survive the unprecedented rate of contemporary climate change,鈥� says co-author Joanne Bennett of Leipzig University and University of Canberra.
The results of this study are particularly relevant to conservation management, say the researchers. Protecting and creating areas that provide refuges for biodiversity from upper temperature extremes is a key strategy for conservation managers.
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About this study "The evolution of critical thermal limits of life on Earth" by Joanne M. Bennett, Jennifer Sunday, Piero Calosi, Fabricio Villalobos, Brezo Mart铆nez, Rafael Molina-Venegas, Miguel B. Ara煤jo, Adam C. Algar, Susana Clusella-Trullas, Bradford A. Hawkins, Sally A. Keith, Ingolf K眉hn, Carsten Rahbek, Laura Rodr铆guez, Alexander Singer, Ignacio Morales-Castilla, and Miguel 脕ngel Olalla-T谩rraga was published in . DOI: |
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