amphibians

Amphibians don’t cozy up to warmer climes

STONY BROOK (US)—A warmer environment leads to a shorter lifespan for cold-blooded animals, meaning global warming could have far-reaching consequences for fish, lizards, and amphibians.

New research from Stony Brook University’s School of Marine and Atmospheric Sciences (SoMAS) shows that for a diverse range of species whose body temperatures vary with the temperature of their surroundings, ambient temperature is the dominant factor controlling geographic variation of lifespan within species.

“We were intrigued by the fact that pearl mussels in Spain have a maximum lifespan of 29 years, while in Russia, individuals of the same species live nearly 200 years,” says assistant professor Stephan Munch.

“We wondered how a relatively small difference in latitude could have such a drastic impact on lifespan. While one might expect that local adaptations or geographic variations in predator and food abundance would account for this disparity, we wanted to see whether the geographical variation in lifespan that we see in all sorts of species has a common physiological basis in temperature.”

The research was published online in the Proceedings of the National Academy of Sciences.

Munch and Ph.D. candidate Santiago Salinas looked at lifespan data from laboratory and field observations for over 90 species from terrestrial, freshwater, and marine environments, including the copepod Arcartia tonsa, which has an average lifespan of 11.6 days and the pearl mussel Margaritifera margaritifera, which has an average lifespan of 74 years and found that across the wide range of species, temperature was consistently related to lifespan.

The researchers’ findings were on target with the relationship that the metabolic theory of ecology (MTE) predicts. The MTE is a modeling framework that has been used to explain the way in which life history, population dynamics, geographic patterns, and other ecological processes scale with an animal’s body size and temperature.

“You can think of an animal as a beaker in which chemical reactions are taking place,” says Salinas. “The same rules that apply to a liquid inside a beaker should apply to animals. Chemists have a relationship for how an increase in temperature will speed up reaction rates, so the MTE borrows that relationship and applies it—with some obvious caveats—to living things.”

The lifespan in 87 percent of the free-living species Munch and Salinas studied varied as predicted by the MTE. Yet after removing the effect of temperature, there was still considerable variation in lifespan within species, indicating that other, local factors still play a role in determining lifespan.

“It is interesting to consider how cold-blooded species are likely to react in the face of global warming,” says Salinas. “Because of the exponential relationship between temperature and lifespan, small changes in temperature could result in relatively large changes in lifespan. We could see changes to ecosystem structure and stability if cold-blooded species change their life histories to accommodate warmer temperatures but warm-blooded species do not.”

Stony Brook University news: www.stonybrook.edu/news

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