HOME >> BIOLOGY >> NEWS
Study finds evolution doesn't always favor bigger animals

Biologists have long believed that bigger is better when it comes to body size, since many lineages of animals, from horses to dinosaurs, have evolved into larger species over time.

But a study published this week by two biologists at the University of California, San Diego in an early online edition of the Proceedings of the National Academy of Sciences suggests that maxim, known as "Cope's Rule," may be only partly true.

The scientists found that populations of tiny crustaceans retrieved from deep-sea sediments over the past 40 million years grew bigger and evolved into larger species, as might be predicted from Cope's Rule. However, the changes in the sizes of these clam-like crustaceans commonly known as ostracodes --from the genus Poseidonamicus -- increased only when the global ocean temperature cooled. When temperatures remained stable, not much happened to body size.

"These data show a very nice correlation between temperature and body size," said Kaustuv Roy, a professor of biology at UCSD and a coauthor of the paper.

"Although not the most glamorous of fossils, deep-sea ostracodes are very useful for this question because they have a rich fossil record, which allows us to reconstruct the evolution of body size in great detail," said Gene Hunt, who designed and conducted the study while postdoctoral fellow at UCSD.

"Scientists have been interested in how body size evolves for a long time, but there is a lot of uncertainty about what factors are most important in determining whether animals get bigger or smaller over time," added Hunt, now a curator at the National Museum of Natural History in Washington, DC.

The two scientists said their data suggest that Cope's Rule--named for Edward Cope, a 19 th century American paleontologist who claimed the fossil record showed that lineages became larger over time--may simply be an evolutionary manifestation of Bergmann's Rule, which holds that animals increase in
'"/>

Contact: Kim McDonald
kmcdonald@ucsd.edu
858-534-7572
University of California - San Diego
17-Jan-2006


Page: 1 2 3

Related biology news :

1. Study begins to reveal clues to the cause and progression of sepsis
2. Study finds gender differences in renal and other genes contributing to blood pressure
3. Study suggests estrogen deficiency can lead to obesity-induced high blood pressure after menopause
4. Study: Sticking to the sand might not be such good, clean fun for beachgoers
5. Study points to new way to predict death risk from torn aorta
6. Study identifies new gene therapy tools for inherited blindness
7. Study finds contaminated water reaching Floridas offshore keys
8. Study sheds light on why humans walk on two legs
9. Study explains how pathogens evolve to escape detection
10. Study finds hereditary link to premenstrual depression
11. Study identifies energy efficiency as reason for evolution of upright walking

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


(Date:1/23/2020)... ... 23, 2020 , ... GIOSTAR/HEAMGEN has developed and ... The red blood cells are made utilizing a bioreactor that permits the ... and replaces the need for a human blood donor. GIOSTAR/HEAMGEN mature ...
(Date:1/22/2020)... , ... January 21, 2020 , ... Lifecycle Biotechnologies announces the new line ... each users’ unique needs based on their process requirements and accurately weighed to 0.001 of ... , Salts , Sugars , Carbohydrates , ...
(Date:1/7/2020)... Texas (PRWEB) , ... January 07, 2020 , ... ... 2020 prospectus. The Lifecycle prospectus features not just part numbers like what can ... manufacturing facilities, the industries it supports, and that is all linked to the ...
Breaking Biology News(10 mins):
(Date:2/21/2020)... (PRWEB) , ... February 21, 2020 , ... ... to improve their manufacturing operations in order to adapt to new approaches like ... up with the increasing demand for personalized medicine and therapies. But with an ...
(Date:2/11/2020)... ... February 11, 2020 , ... INSPAN ... a long-term follow-up clinical study of outpatient L4-L5 lumbar interspinous fixation for ... extension block design, the Inspan device fixates the spine to allow for ...
(Date:2/3/2020)... ... February 03, 2020 , ... Ovation Travel ... Firm Travel, Technology Industry Travel and Biotech/Healthcare Industry Travel Indexes. , All of ... the following statistics:, Average airfare price paid Domestically, ...
(Date:1/27/2020)... ... January 27, 2020 , ... Cerebyte, the leader ... mobile computing, today announced the availability of neuroscience of transformational leadership workshops. These ... latest neuroscience of leadership and change research to become great transformational leaders. The ...
Breaking Biology Technology:
Cached News: