Navigation Links
SU scientists find that in the evolutionary mating game, brawn and stealth rule
Date:12/23/2010

When prowling for a hook up, it's not always the good-looker who gets the girl. In fact, in a certain species of South American fish, brawn and stealth beat out colorful and refined almost every time.

In a series of published studies of a South American species of fish (Poecilia parae), which are closely related to guppies, Syracuse University scientists have discovered how the interplay between male mating strategies and predator behavior has helped preserve the population's distinctive color diversity over the course of time. The third study in the series was published Dec. 23 in BMC Evolutionary Biology, a publication of BioMed Central, London. The studies were supported in part by grants from the National Science Foundation (NSF).

"Poecilia parae are an ideal model for investigating how genetic diversity originates and is maintained within a species," says study author Jorge Luis Hurtado-Gonzales, a Ph.D. candidate in the Department of Biology in SU's College of Arts and Sciences. "The findings may help us better understand how to protect biodiversity in larger ecosystems." Hurtado-Gonzales' co-author is J. Albert C. Uy of the University of Miami.

Like guppies, Poecilia parae sexually reproduce and their offspring are born live. Unlike guppies, in which no two males have exactly the same color patterns, Poecilia parae males come in five, genetically determined colorsred, yellow, blue, parae (clear with a black stripe), and immaculata (drab gray that mimics the color of immature females). When found in the wild, the abundance of each color group represented in the total population is relatively constant despite the fact that females prefer to mate with the more striking reds and yellows.

"If females prefer red and yellow males, then one would think that red and yellow would dominate and the other colors would phase out over time," Hurtado-Gonzales says. "However, red and yellow are the rarest colors found in the wild."

The most recent study in BMC Evolutionary Biology found that while females prefer reds and yellows they go for the winner of fin-to-fin combat in a significant number of cases. In the study, the larger parae almost always prevailed, thus gaining a mating advantage despite its less-than-desirable coloration. Immaculatas, which are the smallest males, generally shunned the showy displays of violence and were mostly ignored by all but yellow males. The larger yellows almost always defeated immaculatas, stopping them from approaching females.

"In the absence of male-to-male competition, we found that females will almost always choose a red male," Hurtado-Gonzales says. "However, if the red loses a fight, the female will generally seek out the winner. In most cases, that is the larger parae, which is the most dominant male."

Immaculatas compensate for their lack of physical prowess and attractiveness through a mating strategy that relies on stealth. In a 2009 study published in the journal Animal Behavior, Hurtado-Gonzales found that the immaculatas' drab color provides camouflage that enables them to stealthy mate with females while the more colorful red males were wooing them. Females are promiscuous and will mate with multiple males. Additionally, immaculatas have developed larger testes, which produce more sperm, providing a post-mating advantage in the race to fertilize female eggs.

Finally, in a study published earlier this year in the Journal of Evolutionary Biology, produced by the European Society for Evolutionary Biology, Hurtado-Gonzales found that a common predator of Poecilia parae prefers to dine on reds and yellows, most likely because their striking colors make them easier to see. This predatory disadvantage contributes to the lower numbers of reds and yellows in the overall population.

"It seems that within an evolutionary scale, the less attractive males persist in the population over their more attractive counterparts by evolving unique, but likely equally effective mating strategies," Hurtado-Gonzales says. "Therefore, the maintenance of multiple colors may result from the interaction between predator control of attractive males (reds and yellows) and the ability of less attractive males to exploit other areas of sexual selection, including male dominance, sneak behavior, and sperm competition."

A forthcoming study will focus on how blue males gain a mating advantage. Early results indicate that blues exploit habitats in which blue light waves maximize their attractiveness to females and possibly limit their vulnerability to predators.


'/>"/>

Contact: Sara Miller
semortim@syr.edu
315-443-9038
Syracuse University
Source:Eurekalert

Related biology news :

1. CSHL scientists show in unprecedented detail how cortical nerve cells form synapses with neighbors
2. Damon Runyon Cancer Research Foundation awards breakthrough scientists
3. UCSB scientists demonstrate biomagnification of nanomaterials in simple food chain
4. Scientists and physicians use genetic sequencing to identify and treat unknown disease
5. Scientists decipher 3 billion-year-old genomic fossils
6. Scripps Research scientists show prions mutate and adapt to host environment
7. Scientists discover powerful biomarker panel for the early detection of breast cancer
8. Scientists identify the largest network of protein interactions related to Alzheimers disease
9. Polar bears: On thin ice? Extinction can be averted, scientists say
10. Scripps scientists see the light in bizarre bioluminescent snail
11. CSHL scientists identify elusive neuronal targets of deep brain stimulation
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/2/2016)... YORK , Feb. 2, 2016 ... of that Rising Market Are you interested ... analysis forecasts revenues for checkpoint inhibitors. Visiongain,s report ... market, submarket, product and national level. Avoid ... discover what progress, opportunities and revenues those emerging ...
(Date:2/2/2016)... 2, 2016  Based on its recent analysis ... recognizes US-based Intelligent Retinal Imaging Systems (IRIS) with ... for New Product Innovation. IRIS, a prominent cloud-based ... America , is poised to set the ... retinopathy market. The IRIS technology presents superior price-performance ...
(Date:2/1/2016)... Fla. , Feb. 1, 2016  Wocket® smart wallet ( www.wocketwallet.com ... and television personality, Joey Fatone . Las Vegas ... greet fans. --> Las Vegas , where ... --> The new video ad was filmed at the Consumer ... appeared at the Wocket booth to meet and greet fans. ...
Breaking Biology News(10 mins):
(Date:2/10/2016)... MA (PRWEB) , ... February 10, 2016 , ... ... is now available on Microsoft Azure. On Azure, Arvados provides capabilities for managing ... saw clear demand for Microsoft Azure from major institutions collecting and analyzing genomic ...
(Date:2/10/2016)... , ... February 10, 2016 , ... Cenna Bioscience Inc., ... the treatment of Alzheimer’s disease, announced today it has been selected to present at ... the Breakers in Palm Beach, Florida. The purpose of the Forum is to ...
(Date:2/9/2016)... ... 2016 , ... With a presidential election in November and the future of ... together over 500 top healthcare leaders for a night and day of debates and ... MBA students of the University of Pennsylvania’s Wharton School, will be held February 18 ...
(Date:2/9/2016)... ... ... Date and time: March 1, 2016, 5:30 p.m. to ... of Bucks County, 3805 Old Easton Road, Doylestown, PA 18902. , The Baruch ... house for participants to learn about a new Master of Biomedical Science (MBS) ...
Breaking Biology Technology: