HOME >> BIOLOGY >> NEWS
Oceanic invasions across Darwin's impassable barrier

Reef fish share genetic connections across what Darwin termed an 'impassable barrier', 5000km of deep ocean separating the eastern and central Pacific, according to a report by Smithsonian scientists in the Proceedings of the Royal Society B.

By sequencing mitochondrial DNA from 20 morphospecies of fairly sedentary shore fish on both sides of the divide, the study confirms close relationships between populations of the same fish species across the barrier and indicates that genes move in both directions across the barrier.

Luck affects who makes it across and when

"We didn't find genetic evidence for any oceanographic or geological events that separated populations such as a major change in currents or the sinking of an underwater platform that could have served as a stepping stone," Lessios points out. "If that were the case, several species would have shown coincident times of separation." Instead, the researchers consider that fish larvae cross the barrier often enough to maintain genetic connections, but in a very haphazard and infrequent fashion, such that speciation did occur in most cases, but was prevented from happening in others.

Two-way gene flow

Conventional wisdom held that there was little larval movement from West to East and no movement from East to West across the divide until a recent study by co-author Robertson et al. indicated that about 20% of transpacific fish invaded from East to West. "The current study provides more meat for that barbeque. If you look at westward currents, they look as good as or better then eastward currents for moving larvae between populations. People were just focused on eastward movement because El Nino currents go that way," according to Robertson.

Whereas this study was able to rule out the idea that a vicariance event separated these species long ago, all of the alternative hypotheses to explain the presence of related species in the Eastern and Central Pacific
'"/>

Contact: Haris Lessios
lessiosh@stri.edu
20-278-620-948-708
Smithsonian Tropical Research Institute
5-Jul-2006


Page: 1 2

Related biology news :

1. Oceanic acidity
2. Modeling alien invasions: Plasticity may hold the key to prevention
3. Different strategies underlie the ecology of microbial invasions
4. New study finds multiple invasions increase green crabs Canadian range
5. How is the digitization of information impacting across the health service?
6. Lizards shout against a noisy background to get points across
7. Beyond nature vs. nurture: Williams syndrome across cultures
8. Low levels of neurotransmitter serotonin may perpetuate child abuse across generations
9. In early embryos, cilia get the message across
10. Full-year results from Oxford Open show wide variation in open access uptake across disciplines
11. Microbes hitchhike across Atlantic on desert dust

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


(Date:5/14/2019)... ... 14, 2019 , ... IMMUNE 3D®, a privately held biotechnology ... of autoimmunity, fibrosis and skin immunology. In addition, the company will leverage its ... efforts. , IMMUNE 3D®’s proprietary platform aims to study factors that affect ...
(Date:5/8/2019)... ... May 08, 2019 , ... RG+A, Inc., ... Carol S. Mann has agreed to serve as Chief Executive Officer and pharmaceutical ... Officer, effective immediately. They will join Chairman and Founder Roger Green to create ...
(Date:5/7/2019)... ... May 07, 2019 , ... ... Beach Convention and Entertainment Center from May 15- 17. At booth #226, AMGtime ... These include flexible software, biometric hardware, mobile apps, specialized industry solutions, advanced add-on ...
Breaking Biology News(10 mins):
(Date:5/2/2019)... ... May 02, 2019 , ... Boston Robotic Hair ... area. Gone are the days of painful hair transplant procedures. Boston Robotic Hair ... is the only robotic intelligent solution to offer a minimally invasive procedure. With ...
(Date:4/25/2019)... , ... April 24, 2019 , ... ... Agents for sales and service organizations, today announced global availability of Inference ... providers and enterprises of all sizes to harness the power of Google’s ...
(Date:4/16/2019)... Md. (PRWEB) , ... April 16, 2019 , ... ... honor Blue Sources and their project partner, the U.S. Army Center for Environmental ... of Aquatic Biomonitor Through Combined In-Licensing/Out-Licensing.” , Blue Sources, a veteran-owned company located ...
(Date:4/15/2019)... ... 2019 , ... Sirrus, Inc., a developer of novel electron-deficient ... to increase production of methylene malonate monomers and oligomers. , The expanded bench ... production facility, which is scheduled to break ground in 2019. “The expanded facility ...
Breaking Biology Technology:
Cached News: