Navigation Links
Big-mouthed babies drove the evolution of giant island snakes
Date:5/15/2012

t 72 pregnant snakes back to the lab. After the snakes gave birth, he measured each of the 1,084 babies they produced. He then looked for correlations between snake size at birth and the size of prey animals available on each island. He also tested for correlations between birth size and adult size.

"The results were unequivocal: snake body size at birth tightly matches the size of prey available on each island," Aubret said.

As predicted, where prey animals were bigger, newborn snakes were bigger and they grew up to be bigger adults. Where prey animals were smaller, newborn snakes followed suit, leading to smaller adults.

A New Dimension to the Island Rule?

Ecologists have long been interested in the peculiarities of island animals. Observations of pygmy elephants and giant rats led a biologist named J. Bristol Foster to propose what became known as the Island Rule. In general, Foster surmised, big animals on islands tend to get smaller than mainland counterparts because of limited access to food. Small animals tend to get larger because islands tend to have fewer predators. Since it was proposed in the 1960s, numerous exceptions to Foster's rule have been noted, and scientists now agree that the ecological factors that influence island body size are far more complex than Foster had imagined.

Aubret's findings add yet another dimension.

"Mean adult body size has always been used as a traditional measure in the literature," he writes. "On the other hand, patterns of variation for body size at birth in island populations have received, to my knowledge, no attention at all."

Aubret's work shows that selection isn't necessarily acting on adult body size.

"This study confirms that adult size variations on islands may be a nonadaptive consequence of selection acting on birth size," he said. "Animals may become either giant or dwarf adults on islands for the simple fact that they were
'/>"/>

Contact: Kevin Stacey
kstacey@press.uchicago.edu
401-284-3878
University of Chicago Press Journals
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Vitamin D for pregnant women and babies -- how much is enough?
2. Lizard moms may prepare their babies for a stressful world
3. 2 servings of salmon a week is healthy for pregnant women and their babies
4. New infant formula ingredients boost babies immunity by feeding their gut bacteria
5. Babies are born with intuitive physics knowledge, says MU researcher
6. Breastfeeding saved babies in 19th century Montreal
7. Barracuda babies: Novel study sheds light on early life of prolific predator
8. Babies born with no eyes: Scientists identify genetic cause
9. Premature babies at risk of ill health in later life, research suggests
10. Sleep disruption for breastfed babies is temporary
11. Joslin study finds clue to birth defects in babies of mothers with diabetes
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Big-mouthed babies drove the evolution of giant island snakes
(Date:11/6/2014)... cancer deaths occur because of metastasis, yet progress ... been slow. , "It,s been particularly challenging to ... Gujral, research fellow in systems biology at Harvard ... detected until after they,ve already metastasized." , Gujral ... that should help researchers better understand how metastasis ...
(Date:11/5/2014)... career to understanding the Earth,s climate and communicating ... deputy director and regional climatologist for the Western ... Redmond has more than three decades of experience ... data to the general public. , At its ... December 15-19, 2014 the American Geophysical Union (AGU) ...
(Date:11/4/2014)... Temple University School of Medicine announced today that ... initiative funded by the Bill & Melinda Gates ... Obstetrics, Gynecology and Reproductive Sciences; and Vice Chair ... School of Medicine will pursue an innovative global ... Biomarkers to Assess Fetal Neurodevelopment.", Grand Challenges Explorations ...
Breaking Biology News(10 mins):Migration negation 2Migration negation 3Nevada climatologist to be honored at AGU Fall Meeting for lifetime of public outreach 2Temple University School of Medicine receives Grand Challenges Explorations grant 2
... DAVIS--Mosquito traps that reek like latrines may be no ... team led by chemical ecologist Walter Leal has discovered ... making humans hold their noses. The synthetic mixture, ... just as enticing to Culex mosquitoes as the current ...
... and South Africa have created a biophysical methodology ... potentially remedy even substantial hearing loss. The authors ... the ear to recognize frequencies originally associated with ... the open-access journal PLoS Computational Biology . ...
... Presenting new research about national, home and business security ... of Houston professor and his colleagues has become the ... to surveillance. Two professors and two ... Institute of Electrical and Electronics Engineers International Conference on ...
Cached Biology News:No more big stink: scent lures mosquitoes, but humans can't smell it 2Biophysical method may help to recover hearing 2National security remedies among topics at surveillance confab 2National security remedies among topics at surveillance confab 3
(Date:11/18/2014)... RPS Diagnostics (RPS®) – a developer ... its third annual partnership of the Centers for ... Antibiotics Week from November 17-23. , Get Smart ... to highlight the coordinated efforts of CDC, state ... partners to provide education about the importance of ...
(Date:11/18/2014)... (PRWEB) November 18, 2014 Alanda ... and Transparency Reporting solutions, announced today that a ... using its Consummate Providerâ„¢ solution in both the ... a Global, SaaS based, Data Quality remediation portal, ... their third party Providers improve their ability to ...
(Date:11/18/2014)... 2014 Array Architects is proud of ... to the nation's hospitals and health systems. It is ... dedicating their careers to the advancement of both the ... her respective field, Laura Silvoy has been chosen to ... Winter Simulation Conference. , Laura will present her ...
(Date:11/18/2014)... DOYLESTOWN, Pa. , Nov. 18, 2014  Novira ... therapies for curative treatment of chronic hepatitis B virus ... , M.D., was appointed to its Scientific Advisory Board ... Brian join our SAB," said Christian S. Schade ... wealth of clinical development experience which will be invaluable ...
Breaking Biology Technology:RPS Again Partners with the CDC in Support of the 2014 Get Smart About Antibiotics Week 2RPS Again Partners with the CDC in Support of the 2014 Get Smart About Antibiotics Week 3Alanda Software Completes Successful Implementation of Global Data Quality & Vendor Management Solution for Top Tier Global Biopharmaceutical Company 2Array Healthcare Simulation Expert Slated to Speak at Winter Simulation Conference 2Novira Therapeutics Announces Appointment of Brian F. Daniels, M.D., to its Scientific Advisory Board 2Novira Therapeutics Announces Appointment of Brian F. Daniels, M.D., to its Scientific Advisory Board 3
... Feb. 10 Microdosing or Phase 0 clinical ... an imperative phase of the drug development process ... niche capability providers in preclinical testing and technology ... partnerships and alliances, fuelling growth opportunities in this ...
... an MBA-student organized event, will be held February 19-20 in Philadelphia. ... from Healthcare Services, Investment, Pharma, Biotech, and Medical Device sectors. ... ... 2009 Wharton Health Care Business Conference , an MBA-student organized ...
... DSM Biologics and Crucell N.V. (Euronext, Nasdaq: ... they have entered into an agreement with Bioceros B.V. ... Under the terms of the agreement, Bioceros will be ... the PER.C6(R) cell line located in the European Union.Karen ...
Cached Biology Technology:Frost & Sullivan Sees Microdosing as Compelling Advantage for Big Pharma 2Frost & Sullivan Sees Microdosing as Compelling Advantage for Big Pharma 314th Annual Wharton Health Care Business Conference to Feature CEOs from WebMD, McKesson, Humana and Given Imaging 2DSM and Crucell Sign Agreement with Bioceros to Serve as Pre-Approved Cell Line Generation Partner of PER.C6(R) Cell Line Proteins 2DSM and Crucell Sign Agreement with Bioceros to Serve as Pre-Approved Cell Line Generation Partner of PER.C6(R) Cell Line Proteins 3DSM and Crucell Sign Agreement with Bioceros to Serve as Pre-Approved Cell Line Generation Partner of PER.C6(R) Cell Line Proteins 4DSM and Crucell Sign Agreement with Bioceros to Serve as Pre-Approved Cell Line Generation Partner of PER.C6(R) Cell Line Proteins 5
Request Info...
... 5B15-5B-11E. Immunogen: Synthetic peptide derived from ... protein. Specificity: Specific for the ... Western blots it identifies the target band ... (positive controls: deglycosylated secreted media from primary ...
Lipid-rich bovine serum albumin for cell culture. It is chromatographically purified and has an IgG content 1.0% (w/w)....
Prepared with distilled water. Yeast extract solution is autolyzed at 150 g/L....
Biology Products: