Navigation Links
Study discovers natural hybridization produced dolphin species
Date:1/8/2014

A newly published study on the clymene dolphin, a small and sleek marine mammal living in the Atlantic Ocean, shows that this species arose through natural hybridization between two closely related dolphins species, according to authors from the Wildlife Conservation Society, the American Museum of Natural History's Sackler Institute for Comparative Genomics, the University of Lisbon, and other contributing groups.

In a molecular analysis including the closely related spinner and striped dolphins, scientists conclude that the clymene dolphin is the product of natural hybridization, a process that is more common for plants, fishes, and birds, but quite rare in mammals.

The study appears in the online journal PLOS ONE. The authors include: Ana R. Amaral of the University of Lisbon, Portugal, and the American Museum of Natural History; Gretchen Lovewell of the Mote Marine Laboratory; Maria Manuela Coelho of the University of Lisbon; George Amato of the American Museum of Natural History; and Howard Rosenbaum of the Wildlife Conservation Society and American Museum of Natural History.

"Our study represents the first such documented instance of a marine mammal species originating through the hybridization of two other species," said Ana R. Amaral, lead author of the study and research associate at the American Museum of Natural History. "This also provides us with an excellent opportunity to better understand the mechanisms of evolution."

The classification of the clymene dolphin has been a longstanding challenge to taxonomists, who initially considered it to be a subspecies of the spinner dolphin. Then in 1981, thorough morphological analyses established it as a recognized distinct species. In the current study, researchers sought to clarify outstanding questions about the dolphin's origin and relationships with rigorous genetic analyses.

"With its similar physical appearance to the most closely related species, our genetic results now provide the key insights into this species origin" said Dr. Howard Rosenbaum, Director for WCS's Ocean Giants Program and a senior author on the study. "Very little is known about the clymene dolphin, whose scientific name translated from Greek is oceanid, but ironically also can mean fame or notoriety. Hopefully, our work will help draw greater attention to these dolphins in large parts of their range."

Based on research conducted at the American Museum of Natural History's Sackler Institute for Comparative Genomics, the authors examined the nuclear and mitochondrial DNA from skin samples obtained from both free-ranging dolphins by means of biopsy darts and deceased dolphins obtained through stranding events. Using samples from 72 individual dolphins (both clymene dolphins and the closely related spinner and striped dolphins), the researchers amplified one mitochondrial DNA marker and six nuclear DNA markers as a means of analyzing the evolutionary relationship between the clymene dolphin and its closest relatives.

The level of discordance among the nuclear and mitochondrial markers from the three species, the authors assert, is best explained as an instance of natural hybridization. Specifically, the team discovered that while the mitochondrial genome of the clymene dolphin most resembled the striped dolphin, the nuclear genome revealed a closer relation to the spinner dolphin. The authors also noted that continued hybridization may still occur, although at low levels.

The clymene dolphin grows up to nearly seven feet in length and inhabits the tropical and temperate waters of the Atlantic Ocean. Threats to the species include incidental capture as bycatch in fishing nets, which in some parts of the range has turned into direct hunts for either human consumption or shark bait.


'/>"/>

Contact: John Delaney
jdelaney@wcs.org
718-220-3275
Wildlife Conservation Society
Source:Eurekalert  

Related biology news :

1. Penn biologists establish new method for studying RNAs regulatory footprint
2. Of lice and men (and chimps): Study tracks pace of molecular evolution
3. New research study: The snowball effect of overfishing
4. MU researchers study of African forest elephants helps guide research efforts in the US
5. MBL scientists to study coastal waterbird habitats through funding for Obamas Climate Action Plan
6. Miriam Hospital study shows keys to successful long-term weight loss maintenance
7. Virginia Techs De Vita receives governments highest of engineering honors to study pelvic disorder
8. New study may aid rearing of stink bugs for biological control
9. Nordic study: Few persons with metabolic syndrome adhere to nutrition recommendations
10. Study explaining parasite gene expression could help fight toxoplasmosis and malaria
11. Montana State University research on algal biofuels keys larger study
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Study discovers natural hybridization produced dolphin species
(Date:4/19/2016)... , UAE, April 20, 2016 ... be implemented as a compact web-based "all-in-one" system solution ... the biometric fingerprint reader or the door interface with ... of modern access control systems. The minimal dimensions of ... ID readers into the building installations offer considerable freedom ...
(Date:4/15/2016)... 15, 2016 Research and ... Biometrics Market 2016-2020,"  report to their offering.  , ... , ,The global gait biometrics market is expected ... the period 2016-2020. Gait analysis generates ... be used to compute factors that are not ...
(Date:4/13/2016)... 2016  IMPOWER physicians supporting Medicaid patients in ... clinical standard in telehealth thanks to a new partnership ... platform, IMPOWER patients can routinely track key health measurements, ... index, and, when they opt in, share them with ... a local retail location at no cost. By leveraging ...
Breaking Biology News(10 mins):
(Date:6/24/2016)... June 24, 2016  Regular discussions on a range of ... between the two entities said Poloz. Speaking at ... Ottawa , he pointed to the country,s inflation target, ... government. "In certain ... institutions have common economic goals, why not sit down and ...
(Date:6/23/2016)... , ... June 23, 2016 , ... ... pleased to announce the launch of their brand, UP4™ Probiotics, into Target stores ... 35 years, is proud to add Target to its list of well-respected retailers. ...
(Date:6/23/2016)... (PRWEB) , ... June 23, 2016 , ... ... Plate® YM (Yeast and Mold) microbial test has received AOAC Research Institute approval ... of microbial tests introduced last year,” stated Bob Salter, Vice President of Regulatory ...
(Date:6/23/2016)... ... June 23, 2016 , ... STACS DNA Inc., the ... at the Arkansas State Crime Laboratory, has joined STACS DNA as a Field Application ... team,” said Jocelyn Tremblay, President and COO of STACS DNA. “In further expanding our ...
Breaking Biology Technology: