Navigation Links
New study shows how giant tortoises, alligators thrived in High Arctic 50 million years ago
Date:8/24/2010

m the Emydidae family, the largest and most diverse family of contemporary pond turtles. While Coryphodon and bowfins grew throughout the year, the turtles exhibited shell growth only during summer months, much like turtles that live today in non-equatorial areas.

"By looking at a host of animals with different physiologies, we were better able to pin down warm- and cold-month temperatures," she said. "Many aspects of biodiversity and species richness are related more to seasonal temperatures and ranges such as cold-month means rather than to mean annual temperature."

Bowfins -- which have a long dorsal fin and powerful jaws -- inhabit a variety of waters today from the Saint Lawrence River drainage in Quebec south to Florida and Texas. The team also compared the ranges of bowfins, aquatic turtles and giant tortoises of today with their ranges in the Eocene to help them estimate temperatures, according to co-author Newbrey, an expert in both contemporary and extinct fishes.

Eberle said the new study implies Eocene alligators could withstand slightly cooler winters than their present-day counterparts, although data from captive alligators show they are heartier than other members of the crocodilian family and can survive short intervals of subfreezing temperatures by submerging themselves in the water.

In contrast, the existence of large land tortoises in the Eocene High Arctic is still somewhat puzzling, said Eberle, since today's large tortoises inhabit places like the Galapagos Islands where the cold-month average temperature is about 50 degrees F (10 degrees C.)

But during the late Pleistocene period some 10,000 to 50,000 years ago -- when air temperatures were comparable to those today -- large land tortoises were found as far north as present-day Pennsylvania and Illinois, Eberle said. This suggests their present range in the Americas does not represent their fullest geographic range as allowed by climate. Facto
'/>"/>

Contact: Jaelyn Eberle
jaelyn.eberle@colorado.edu
303-492-8069
University of Colorado at Boulder
Source:Eurekalert  

Page: 1 2 3 4

Related biology news :

1. Long-term study shows effect of climate change on animal diversity
2. £2 million study to reveal workings of dementia genes
3. New study looks to define evangelicals and how they affect polling
4. CU-Boulder study suggests air quality regulations miss key pollutants
5. Researchers study acoustic communication in deep-sea fish
6. Study reveals homeowner perceptions in fire-prone areas
7. Researchers study how pistachios may improve heart health
8. Study: urban black bears live fast, die young
9. New study indicates link between weight gains during pregnancy and dieting history
10. Study reveals specific gene in adolescent men with delinquent peers
11. Sweat it out: UH study examines ability of sweat patches to monitor bone loss
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
New study shows how giant tortoises, alligators thrived in High Arctic 50 million years ago
(Date:4/14/2015)... , April 14, 2015  HYPR Corp. today ... (FIDO ® ) Alliance tm , an industry ... members commit to share technology and collaborate to ... are interoperable, more secure and private, and easier ... identity verification that protects sensitive user information and ...
(Date:4/13/2015)... CHICAGO , April 13, 2015  higi, a ... with ways to more fully engage with their communities ... its industry-leading, privacy protected and secure API.  ... API enables the most accessible, affordable, and convenient vehicle ... The API will ...
(Date:4/8/2015)... , April 8, 2015  Infinisource, a ... and services, and Morpho, a leading supplier of ... to produce the market,s most advanced biometrically-enabled time ... iSolved NXG time clock is setting a bold, ... labor data for the small and mid-size employer. ...
Breaking Biology News(10 mins):HYPR Corp. Joins the FIDO Alliance 2HYPR Corp. Joins the FIDO Alliance 3higi Launches Seamless Access to HIPAA-Compliant Health Outcomes and Activity Data 2higi Launches Seamless Access to HIPAA-Compliant Health Outcomes and Activity Data 3iSolved Time Clock Offers Unmatched Accuracy due to Morpho Biometrics 2iSolved Time Clock Offers Unmatched Accuracy due to Morpho Biometrics 3
... 16, 2012A research team led by St. Michael,s Hospital,s Dr. ... and track the risk for an infectious disease outbreak at ... time, experts from around the world are working together to ... levels. "Systems that track infectious diseases at the global ...
... deadly unless they evolve the ability to grow beyond ... -- even early-stage tumor cells -- are tethered to ... scientists from the University of Helsinki, Finland, and from ... tumor cells, allowing them to further misbehave. ...
... -- With one simple experiment, University of Illinois chemists ... drug. Led by chemistry professor and Howard Hughes ... demonstrated that the top drug for treating systemic fungal ... essential to yeast,s physiology, a finding that could change ...
Cached Biology News:Canadian-led research team develop new model to anticipate disease outbreaks at 2012 Olympics 2Some breast cancer spread may be triggered by a protein, study shows 2Some breast cancer spread may be triggered by a protein, study shows 3Powerful drug's surprising, simple method could lead to better treatments 2Powerful drug's surprising, simple method could lead to better treatments 3
(Date:4/27/2015)... (PRWEB) April 27, 2015 Diasome ... an agreement with Joslin Diabetes Center (“Joslin”) to ... study of Diasome’s novel Hepatocyte Directed Vesicle (“HDV”) ... 1 diabetes. , Located in Boston, Massachusetts, ... care and education organization dedicated to the prevention, ...
(Date:4/24/2015)... AZ (PRWEB) April 24, 2015 The ... State University (ASU) have entered into an agreement to ... A memorandum of agreement signed by the universities will ... student success and other services particularly, though not exclusively, ... “We have complementary strengths and a similar set of ...
(Date:4/24/2015)... - Mirego, leader in mobile strategies and solutions, is proud ... extensions for the all new Apple Watch. Made in ... MediaMiser, these extensions will reinvent the way users receive and ... use.  Available today in Canada ... smartwatch that makes for an excellent buddy for business, health ...
(Date:4/23/2015)... CA (PRWEB) April 23, 2015 Athena ... personal development of executive women in San Diego’s technology ... the 17th Annual Pinnacle Awards at their Gala on ... Hyatt Hotel. Register now at http://athenasd.org/events/ , ... support the Athena San Diego vision of fostering networking, ...
Breaking Biology Technology:Diasome Pharmaceuticals Announces Clinical Trial Design Collaboration 2South Dakota Mines, Arizona State University Pave Way for Cooperative Research 2Familiprix, OMSignal and MediaMiser apps available today for Apple Watch 2Athena Pinnacle Awards to Honor Executives, Corporations and Educators Working to Promote Women Leaders 2
... ... Climate Change (NACCC) through its Second National Communication (SNC) Project in collaboration with the ... and sea level rise results that will form the background for the country’s SNC ... ...
... , DURHAM, N.C., Nov. ... first energy-efficient, single-treatment water purification system NanoPure(TM) developed from ... Supply, Hon. Minister Viswarup and other leaders in Hyderabad, ... Technology (IIT) Kanpur, confirmed that the majority of the ...
... , ... Biotech Ltd. ( SVA),a leading developer and provider of ... agreement to establish Sinovac (Dalian) Vaccine,Technology Co., Ltd. (Sinovac ... vaccines. Sinovac will contribute its expertise,and experience in developing ...
Cached Biology Technology:Preliminary Climate and Sea Level Changes for Vanuatu Through the Application of SimCLIM 2Preliminary Climate and Sea Level Changes for Vanuatu Through the Application of SimCLIM 3Preliminary Climate and Sea Level Changes for Vanuatu Through the Application of SimCLIM 4North Carolina-based Cnanoz Unveils NanoPure(TM) to Government Leaders in Hyderabad, India 2Sinovac Establishes Joint Venture to Expand Human-Use Vaccine Development and Manufacturing Capabilities 2Sinovac Establishes Joint Venture to Expand Human-Use Vaccine Development and Manufacturing Capabilities 3
Donor Goat Serum...
GeneRacer is an advanced RACE (rapid amplification of cDNA ends) technique that improves the efficiency of amplifying full-length 5' and 3' cDNA ends. With the GeneRacer Kit you can:...
... [APS 26] to Presenilin 2 Alzheimer's ... of the disease carry mutations in the ... precursor protein (APP). These disease-linked mutations result ... of amyloid-beta (main component of amyloid deposits ...
One-step, microplate or cuvet, colorimetric, linear detection range 0.9 mg/dL to 200 mg/dL. Procedure: 2 min....
Biology Products: