Navigation Links
Superfast evolution in sea stars
Date:7/24/2012

How quickly can new species arise? In as little as 6,000 years, according to a study of Australian sea stars.

"That's unbelievably fast compared to most organisms," said Rick Grosberg, professor of evolution and ecology at UC Davis and coauthor on the paper published July 18 in the journal Proceedings of the Royal Society B.

Grosberg is interested in how new species arise in the ocean. On land, groups of plants and animals can be physically isolated by mountains or rivers and then diverge until they can no longer interbreed even if they meet again. But how does this isolation happen in the wide-open ocean?

Grosberg and colleagues studied two closely related "cushion stars," Cryptasperina pentagona and C. hystera, living on the Australian coast. The animals are identical in appearance but live in different regions: Hystera occurs on a few beaches and islands at the far southern end of the range of pentagona.

And their sex lives are very, very different. Pentagona has male and female individuals that release sperm and eggs into the water where they fertilize, grow into larvae and float around in the plankton for a few months before settling down and developing into adult sea stars.

Hystera are hermaphrodites that brood their young internally and give birth to miniature sea stars ready to grow to adulthood.

"It's as dramatic a difference in life history as in any group of organisms," Grosberg said.

The researchers looked at the diversity in DNA sequences from sea stars of both species and estimated the length of time since the species diverged.

The results show that the species separated about 6,000 to 22,000 years ago. That rules out some ways new species could evolve. For example, they clearly did not diverge slowly with genetic changes over a long period of time, but were isolated quickly.

Over the last 11,000 years, the boundary between cold and warm water in the Coral Sea has fluctuated north and south. A small population of the ancestral sea stars, perhaps even one individual, might have colonized a remote area at the southern end of the range then been isolated by one of these changes in ocean currents.


'/>"/>
Contact: Andy Fell
ahfell@ucdavis.edu
530-752-4533
University of California - Davis
Source:Eurekalert  

Related biology news :

1. Scientists connect seawater chemistry with climate change and evolution
2. Tamarisk biocontrol efforts get evolutionary boost
3. Sandia seeks commercial partners for revolutionary SpinDx medical diagnostic tool
4. SDSCs CIPRES Science Gateway clarifies branches in evolutions tree of life
5. Revolutionary project will obtain entire genome sequences in fight against Alzheimers
6. Study provides first evidence of coevolution between invasive, native species
7. Mercury mineral evolution
8. Clues to nervous system evolution found in nerve-less sponge
9. Not a 1-way street: Evolution shapes environment of Connecticut lakes
10. Big-mouthed babies drove the evolution of giant island snakes
11. Maps of Miscanthus genome offer insight into grass evolution
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Superfast evolution in sea stars
(Date:3/28/2017)... , March 28, 2017 The ... Hardware (Camera, Monitors, Servers, Storage Devices), Software (Video Analytics, ... Region - Global Forecast to 2022", published by MarketsandMarkets, ... 2016 and is projected to reach USD 75.64 Billion ... and 2022. The base year considered for the study ...
(Date:3/24/2017)... Controller General of Immigration from Maldives Mr. Mohamed Anwar and ... international IAIR Award for the most innovative high security ePassport and eGates  ... ... Maldives Immigration Controller General, Mr. Mohamed Anwar ... right) have received the IAIR award for the "Most innovative high security ...
(Date:3/23/2017)... , March 23, 2017 The report "Gesture Recognition and ... Industry, and Geography - Global Forecast to 2022", published by MarketsandMarkets, the market ... CAGR of 29.63% between 2017 and 2022. Continue ... ... ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... NY (PRWEB) , ... October 12, 2017 , ... ... of Sciences today announced the three Winners and six Finalists of the 2017 ... given annually by the Blavatnik Family Foundation and administered by the New York ...
(Date:10/12/2017)... ... 12, 2017 , ... AMRI, a global contract research, development ... patient outcomes and quality of life, will now be offering its impurity solutions ... new regulatory requirements for all new drug products, including the finalization of ICH ...
(Date:10/11/2017)... ... , ... Personal eye wash is a basic first aid supply for any work environment, but ... do you rinse first if a dangerous substance enters both eyes? It’s one less decision, ... its unique dual eye piece. , “Whether its dirt and debris, or an acid or ...
(Date:10/11/2017)... ROTTERDAM, the Netherlands and LAGUNA HILLS, ... that The Institute of Cancer Research, London ... will use MMprofiler™ with SKY92, SkylineDx,s prognostic tool to risk-stratify ... high-risk trial known as MUK nine . The University ... this trial, which is partly funded by Myeloma UK, and ...
Breaking Biology Technology: