HOME >> BIOLOGY >> NEWS
Why do cold animals make bigger babies?

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 Leach (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."


'"/>

Contact: Suzanne Wu
swu@press.uchicago.edu
773-834-0386
University of Chicago Press Journals
2-Oct-2006


Page: 1

Related biology news :

1. Limpets reveal possible fate of cold-blooded Antarctic animals
2. Killing only a few animals wont do any harm -- or will it?
3. Massive herds of animals found to still exist in Southern Sudan
4. Jefferson scientists use gene therapy to reverse heart failure in animals
5. Reproductive speed protects large animals from being hunted to extinction
6. Global survey of lizards reveals greater abundance of animals on islands than on mainland ecosystems
7. Penn study finds inhaled anesthetics accelerate the appearance of brain plaque in animals
8. New compound prevents alcoholic behavior, relapse in animals by blocking stress response
9. Smoking produces changes in human brain like those in animals using illicit drugs
10. Antarctic warming to reduce animals at base of ecosystem, shift some penguin populations southward
11. Local range estimation in wild animals

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/18/2017)... , April 18, 2017  Socionext Inc., a global expert ... a media edge server, the M820, which features the company,s hybrid ... software provided by Tera Probe, Inc., will be showcased during the ... the NAB show at the Las Vegas ... ...
(Date:4/11/2017)... April 11, 2017 Crossmatch®, a globally-recognized ... solutions, today announced that it has been awarded ... Projects Activity (IARPA) to develop next-generation Presentation Attack ... "Innovation has been a driving force within ... will allow us to innovate and develop new ...
(Date:4/6/2017)... -- Forecasts by Product Type (EAC), Biometrics, ... (Transportation & Logistics, Government & Public Sector, Utilities / ... Facility, Nuclear Power), Industrial, Retail, Business Organisation (BFSI), Hospitality ... looking for a definitive report on the $27.9bn Access ... ...
Breaking Biology News(10 mins):
(Date:5/23/2017)... ... May 23, 2017 , ... ... technology applications, has announced a facility expansion to accommodate its rapid growth. , ... of new workspace and renovation of the existing areas. The expansion includes, a ...
(Date:5/23/2017)... ... ... Cambridge Semantics , the leading provider of Big Data management and ... Expo in Boston May 23-25 with a featured speaker and solution demos of ... is also a finalist for the Best of Show award. , James LaPointe, Managing ...
(Date:5/22/2017)... ... 22, 2017 , ... Baltimore biotech firm, PathSensors, announced that ... in developing and issuing recommendations to grow Maryland's biohealth industry and position the ... , The recommendations are contained in a report from the ...
(Date:5/21/2017)... CA (PRWEB) , ... May 20, 2017 , ... ... tool that helps avoid the lengthy trial and error process by finding the ... It can also strengthen the doctor-patient relationship through a personalized approach to ...
Breaking Biology Technology:
Cached News: