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Why Do Cold Animals Make Bigger Babies?

Date:
October 3, 2006
Source:
University of Chicago Press Journals
Summary:
Reproduction involves a critical decision: Should an organism invest energy in a few large offspring or many small ones? In a new study from the American Naturalist, biologists used a new statistical approach that can test multiple theories at the same time, an approach they hope will shed light on many evolutionary problems. They used data from many populations of Eastern Fence Lizards (Sceloporus undulatus), which revealed that the lizards in colder environments produce larger offspring than lizards in warmer environments.

A pregnant female (Sceloporus undulatus) basking on a rocky slope in Ohio.
Credit: Courtesy Peter H. Niewiarowski

Reproduction involves a critical decision: Should an organism invest energy in a few large offspring or many small ones?

In a new study from The American Naturalist, Michael Angilletta (Indiana State University), Chris Oufiero (University of California, Riverside), and Adam Leachι (University of California, Berkeley) used a new statistical approach that can test multiple theories at the same time, an approach they hope will shed light on many evolutionary problems.

They used data from many populations of Eastern Fence Lizards (Sceloporus undulatus), which revealed that the lizards in colder environments produce larger offspring than lizards in warmer environments.

So why do animals in colder climates produce larger offspring? One theory suggests the larger size of offspring counteracts their slow growth in the cold. Yet another theory suggests large offspring are not directly linked to temperature at all. Instead, large offspring just happen to be produced by large mothers, who grow large because they require more energy to reproduce in the cold.

When they tested the theories simultaneously with their new approach, the team concluded that temperature's effect on reproduction is a byproduct of its effect on adult size. "This result could have widespread significance," says Angilletta. "Temperature determines the adult size of virtually all organisms. For many of these organisms, we expect temperature to also leave an imprint on reproduction."

Founded in 1867, The American Naturalist is one of the world's most renowned, peer-reviewed publications in ecology, evolution, and population and integrative biology research. AN emphasizes sophisticated methodologies and innovative theoretical syntheses--all in an effort to advance the knowledge of organic evolution and other broad biological principles.

Michael J. Angilletta Jr., Christopher E. Oufiero, and Adam D. Leachι, "Direct and indirect effects of environmental temperature on the evolution of reproductive strategies: an information-theoretic approach." The American Naturalist 167:10.


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The above story is based on materials provided by University of Chicago Press Journals. Note: Materials may be edited for content and length.


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University of Chicago Press Journals. "Why Do Cold Animals Make Bigger Babies?." ScienceDaily. ScienceDaily, 3 October 2006. <www.sciencedaily.com/releases/2006/10/061002214856.htm>.
University of Chicago Press Journals. (2006, October 3). Why Do Cold Animals Make Bigger Babies?. ScienceDaily. Retrieved October 20, 2014 from www.sciencedaily.com/releases/2006/10/061002214856.htm
University of Chicago Press Journals. "Why Do Cold Animals Make Bigger Babies?." ScienceDaily. www.sciencedaily.com/releases/2006/10/061002214856.htm (accessed October 20, 2014).

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