Evolution, ecosystems may buffer some species against climate change

March 6th, 2009 - 2:42 pm ICT by ANI  

Washington, March 6 (ANI): A new study has suggested that although ecologists expect many species will be harmed by climate change, some species could be buffered by their potential to evolve or by changes in their surrounding ecosystems.

The study, by researchers at the University of Wisconsin-Madison and the University of Arizona, is using a common agricultural insect pest to understand how ecological and evolutionary factors drive population shifts in the face of a changing environment.

It shows that both ecological interactions within a food web and the potential for rapid evolutionary adaptation play critical roles in determining how populations of the legume-loving pea aphid fare during increasing bouts of hot weather, one aspect of predicted climate change.

One of the most important lessons of the work is that predictions of the consequences of environmental change on populations must take into account both ecological and evolutionary complexities, according to Jason Harmon, a UW-Madison postdoctoral researcher and lead author of the new study.

If youre interested in environmental change and how species are going to respond to it, you cant just look at a single species in isolation as it is right now. You have to think about those other species around it, and you have to think about the species potential to change along with the environment, he said.

Bouts of high temperature decrease pea aphid reproduction, but inherited bacteria living symbiotically within the aphids bestow them with a possible evolutionary defense.

Because we can experimentally manipulate aphid bacteria, we have an excellent model system to explore evolutionary adaptation, said University of Arizona professor of ecology and evolutionary biology Nancy Moran, a co-author of the study.

The researchers showed that the degree of heat tolerance conferred by the symbiotic bacteria influenced whether the aphids thrived or succumbed to experimental heat stress in the field.

The result shows that the potential for rapid evolution can have a large impact on how populations respond to environmental change.

According to UW-Madison zoology professor Anthony Ives, while predicting the response of species to climate change is complicated, the new study may help de-mystify complex processes by identifying specific factors that are relevant.

This new work will help other scientists take a broad ecological and evolutionary view while studying the effects of environmental change, he added. (ANI)

Related Stories

Tags: , , , , , , , , , , , , , , , , , , ,

Posted in Health Science |