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:6/23/2015)... June 22, 2015 ... addition of the "Body-Worn Temperature Sensors Market ... and Forecast 2014 - 2020" report to ... analysis of the global body-worn temperature sensors market. ... segmented on the basis of types, care setting, ...
(Date:6/17/2015)... Maryland , June 17, 2015 ... mit DNA-Tests verbessert den Analyseprozess und senkt Laborkosten    ... Prime Standard: QIA) hat heute in den ... ® für die forensische Analyse ... zur Erstellung genetischer Fingerabdrücke bieten eine integrierte Lösung für ...
(Date:6/16/2015)... NEW YORK , June 16, 2015  With ... the world, security remains a top concern. The recent ... confirms the need for strong authentication within government ... HYPR Token, a biometric one-time password (OTP) authenticator, has ... Processing Standards (FIPS) 140-2 Level 3 validation for tamper ...
Breaking Biology News(10 mins):Body-Worn Temperature Sensors Market - Global Industry Analysis 2QIAGEN bringt in den USA neue Kits für die forensische DNA-Analyse auf den Markt 2QIAGEN bringt in den USA neue Kits für die forensische DNA-Analyse auf den Markt 3QIAGEN bringt in den USA neue Kits für die forensische DNA-Analyse auf den Markt 4QIAGEN bringt in den USA neue Kits für die forensische DNA-Analyse auf den Markt 5QIAGEN bringt in den USA neue Kits für die forensische DNA-Analyse auf den Markt 6Government Ready Biometric Security Approaching as HYPR Corp. Files FIPS 140-2 Level 3 Validation for Its Proprietary Biometric Token 2Government Ready Biometric Security Approaching as HYPR Corp. Files FIPS 140-2 Level 3 Validation for Its Proprietary Biometric Token 3
... holes in our teeth that make them incredibly sensitive, ... and children worldwide. , Preliminary research presented today ... that creating tiny spheres of a ceramic material called ... for sensitive teeth. , Sensitive teeth or 'dental hypersensitivity' ...
... during development also control timing of aging and death, and ... researchers report in the journal Science. , "Although there ... there are genetic aspects to the processes of development and ... Molecular, Cellular and Developmental Biology and senior author of ...
... to the Earth's landscape , The ice ages made massive ... the ice in the oceans? , Research by marine scientists ... whole communities of animals were wiped out by ice sheets ... been thought that these ecosystems somehow dodged extinction by recolonising ...
Cached Biology News:'Nanospheres' that block pain of sensitive teeth 2MicroRNA gene that regulates lifespan found by Yale scientists 2Seafloor creatures destroyed by ice action during ice ages 2
(Date:7/3/2015)... July 3, 2015  Pomerantz LLP announces that a ... Inc. ("Puma" or the "Company")(NYSE: PBYI ) and ... United States District Court, Central District of ... behalf of a class consisting of all persons or ... and May 13, 2015 inclusive (the "Class Period").  This ...
(Date:7/2/2015)... GLASGOW, Scotland , July 2, 2015 ...   Bio-tech procurement company Amici Procurement has ... IOM) to help it move to Office 365. ... Procurement provides small to medium-sized companies in the ... with all aspects of the purchasing cycle to help ...
(Date:7/1/2015)... 2015   Decision Resources Group finds ... Otezla are its oral administration, alternative mechanism of ... surveyed rheumatologists. Otezla was the first oral therapy ... active psoriatic arthritis in the United ... includes conventional oral treatments including disease-modifying antirheumatic drugs ...
(Date:7/1/2015)... CHANDLER, Ariz. , July 1, 2015 ... announced it has earned three Gold, three Silver, and ... Business Awards gala held in Chicago ... recognized as the premier business awards program in the ... and recognizes our company,s strength in developing leaders, cultivating ...
Breaking Biology Technology:SHAREHOLDER ALERT: Pomerantz Law Firm Reminds Shareholders with Losses on their Investment in Puma Biotechnology, Inc. of Class Action Lawsuit and Upcoming Deadline - PBYI 2SHAREHOLDER ALERT: Pomerantz Law Firm Reminds Shareholders with Losses on their Investment in Puma Biotechnology, Inc. of Class Action Lawsuit and Upcoming Deadline - PBYI 3SHAREHOLDER ALERT: Pomerantz Law Firm Reminds Shareholders with Losses on their Investment in Puma Biotechnology, Inc. of Class Action Lawsuit and Upcoming Deadline - PBYI 4Biotech Procurement Company Moves to Office 365 with iomart 2Surveyed Rheumatologists Report That Otezla's Oral Administration is its Single Greatest Advantage Over Currently Available Treatment Options 2Surveyed Rheumatologists Report That Otezla's Oral Administration is its Single Greatest Advantage Over Currently Available Treatment Options 3Isagenix Earns Nine American Business Awards 2Isagenix Earns Nine American Business Awards 3
... Calif., Sept. 2 BioMarin,Pharmaceutical Inc. (Nasdaq: BMRN ... BioMarin, will present a company,update at the Morgan Stanley ... 9, 2008 at 1:35 p.m. ET., Interested parties ... via the investor section of the BioMarin website, ...
... http://www.StopAfib.org, announces that September is Atrial Fibrillation,Month to ... or AF., Once considered benign, this common cardiac ... Every five minutes, someone in the,U.S. has a stroke ... the #1 cause of,permanent disability, and takes a disproportionate ...
... Inc. (Amex:,SGN) announced earlier today that breaking news ... market, regarding the law firm of Vianale & ... is a life sciences company focused on the ... signal,monitoring. Signalife uses its patented signal technology to ...
Cached Biology Technology:BioMarin to Present at the Morgan Stanley Global Healthcare Conference 2Atrial Fibrillation Month - StopAfib.org Announces September Focus on Life-Threatening Irregular Heartbeat 2Signalife to Issue Breaking News Regarding Vianale & Vianale Tomorrow 2
... Thermo Sequenase Dye Primer Manual Cycle Sequencing ... fluorescent dye-labeled primers and high-resolution fluorescence scanners. ... by standard slab gel electrophoresis and scanning ... sequencing products. The kit components have ...
... SYBR Green II RNA gel stain ... that has bright fluorescence when bound to RNA ... for use with either formaldehyde/agarose or polyacrylamide gels ... µL stains 50 minigels. A 1 mL unit ...
Sirtuin 7 (SIRT7) Rabbit anti-Human Polyclonal Antibody Immunogen: Synthetic peptide - KLH conjugated Family: Other Recommended Storage: Long term: -20C; Short term: +4C...
... microplate sealer with an integrated in-line plate ... a variety of configurations and sealing capabilities. ... stacker and 240-plate storage capacity , Integrated ... small workcells , Handles all SBS microplates ...
Biology Products: