Navigation Links
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 Leaché (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."
'"/>

Source:University of Chicago Press Journals


Page: 1

Related biology news :

1. Plants, animals share molecular growth mechanisms
2. Elephants imitate truck noises, other animals
3. Carnegie Mellon scientists develop tool that uses MRI to visualize gene expression in living animals
4. Gene therapy for Parkinsons disease moves forward in animals
5. Use of PET can reduce, may eliminate more strenuous drug development trials with animals
6. Undesirable expatriates: Preventing the spread of invasive animals
7. Two new retroviruses—transmitted from animals—identified
8. Stem cell therapy successfully treats heart attack in animals
9. More animals join the learning circle
10. Proposal would allow wild animals to roam North America
11. Research suggests fitness of Florida panthers improved by limited breeding with Texas animals
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Why cold animals make bigger babies

(Date:10/17/2014)... release is available in German . ... of sperms every day in order to reproduce? And why ... the topic of the latest issue of the research journal ... The evolutionary biologist Steven Ramm from Bielefeld University Bielefeld has ... is not unusual for a female to copulate with several ...
(Date:10/16/2014)... Institute of Marine Science have received a 3-year, ... identify the streams and wetlands most vulnerable to ... local governments and citizens conserve these important ecosystems. ... of tidal-marsh observations first gathered by VIMS scientists ... can today,s researchers accurately map the slow but ...
(Date:10/16/2014)... infections and worldwide claims the lives of 160,000 ... University have succeeded in developing a promising vaccination ... , Xavier Saelens (VIB/UGent): "We discovered a new ... development of a novel approach to vaccination against ... small children and elderly people." , RSV: ...
Breaking Biology News(10 mins):Sperm wars 2EPA grant will help localities conserve headwater wetlands 2EPA grant will help localities conserve headwater wetlands 3New perspectives for development of an RSV vaccine 2
... have developed a computer-aided method that uses electronic ... advances toward personalized health care, disease management and ... Chawla and his doctoral student, Darcy A. Davis, ... Engine (CARE) for personalized disease risk predictions and ...
... A forest full of rabbits and foxes, a bubbling ... a cell are, to a computer, similar systems: Many ... of rules and individual interactions that can,t be precisely ... pathways, or rabbits multiplying or getting eaten. Predicting ...
... WA, and Ahmedabad, India, July 25, 2013: In ... group and an innovation-led global healthcare provider, and ... organization, announced today they are collaborating on the ... (VL) vaccine candidate, designed to prevent the deadly ...
Cached Biology News:Notre Dame researchers develop system that uses a big data approach to personalized healthcare 2Computer can infer rules of the forest 2IDRI and Zydus sign agreement for development of IDRI's vaccine candidate for visceral leishmaniasis 2
(Date:10/20/2014)... 20, 2014 /PRNewswire/ - BIOREM Inc. (TSXV: BRM) ("Biorem" or "the ... Q3 orders to $5.8 million and provides a good start to ... North America and one in the ... projects at record levels," said Peter Bruijns , President & ... end of Q3 than they have been for any complete year ...
(Date:10/20/2014)... Earle Martin , Chief Executive ... Ellen Teplitzky, an experienced attorney specializing in business ... has joined the firm as Director of Legal ... NDA Partners provides legal services, including research, ... top law firms and their clients in cases ...
(Date:10/19/2014)... The Asia-Pacific Bromine Market report defines and ... and forecast of revenue. , Browse through the ... to get an idea of the in-depth analysis ... segmentation in the Asia-Pacific bromine market, and is ... http://www.micromarketmonitor.com/market/asia-pacific-bromine-6741503144.html , Bromine is a volatile ...
(Date:10/19/2014)... The report "Unmanned Ground Vehicle Market by ... Type & by Geography - Forecasts & Analysis ... vehicle market into various sub segments with an ... report also identifies the factors driving this market, ... the adoption trends. , The unmanned ground vehicle ...
Breaking Biology Technology:NDA Partners Appoints Ellen Teplitzky, JD as Director of its Legal Services Practice 2The Asia-Pacific Bromine Market is estimated to grow to $4,080.1 million by 2018 - New Report by MicroMarket Monitor 2The Asia-Pacific Bromine Market is estimated to grow to $4,080.1 million by 2018 - New Report by MicroMarket Monitor 3Unmanned Ground Vehicle (UGV) Market Estimated to Reach $8.26 Billion by 2020 - New Research Report by MarketsandMarkets 2Unmanned Ground Vehicle (UGV) Market Estimated to Reach $8.26 Billion by 2020 - New Research Report by MarketsandMarkets 3Unmanned Ground Vehicle (UGV) Market Estimated to Reach $8.26 Billion by 2020 - New Research Report by MarketsandMarkets 4Unmanned Ground Vehicle (UGV) Market Estimated to Reach $8.26 Billion by 2020 - New Research Report by MarketsandMarkets 5
... Mass., May 11 Boston Scientific Corporation (NYSE: ... Company,s major events and news announcements at the 30th ... run from May 13 to 16 in Boston. ... from the MADIT II clinical trial and the ALTITUDE ...
... VANCOUVER, May 11 /PRNewswire-FirstCall/ - OncoGenex Pharmaceuticals, Inc. ... final survival data from a randomized Phase 2 ... docetaxel alone as first-line chemotherapy in patients with ... an oral presentation at the American Society of ...
... 11 Dalton Pharma Services and ProCitius Research jointly ... contract chemistry services of exceptional ... their discovery and development output in an era of ... "offshore" contract research organizations (CROs) ...
Cached Biology Technology:Boston Scientific Announces Company Schedule for Heart Rhythm Society Scientific Sessions 2Boston Scientific Announces Company Schedule for Heart Rhythm Society Scientific Sessions 3Boston Scientific Announces Company Schedule for Heart Rhythm Society Scientific Sessions 4Boston Scientific Announces Company Schedule for Heart Rhythm Society Scientific Sessions 5OncoGenex Pharmaceuticals' Clinical Programs to be Featured in Oral Presentations at the American Society of Clinical Oncology Annual Meeting 2OncoGenex Pharmaceuticals' Clinical Programs to be Featured in Oral Presentations at the American Society of Clinical Oncology Annual Meeting 3Dalton Pharma Services and ProCitius Announce a Strategic Alliance to Provide Contract Chemistry Services 2Dalton Pharma Services and ProCitius Announce a Strategic Alliance to Provide Contract Chemistry Services 3
... The GSTTag Monoclonal Antibody is a ... affinity to the 26 kDa glutathione-S-transferase ... This purified antibody is suitable for ... sequence expressed in E. coli , ...
... LNA microarray slides for microRNA expression ... incorporate Exiqons unique Locked Nucleic Acid (LNA) ... mismatch discrimination for short microRNA (miRNA) targets. ... 1 g total RNA (no need for ...
... there have been many modifications to the original ... salt solutions still play an important role in ... the pH and osmotic balance in the medium ... essential inorganic ions, is as valuable today as ...
Imject Freund's Complete Adjuvant (FCA)...
Biology Products: