HOME >> BIOLOGY >> NEWS
Certain fish have a special mating preference

NOTE: The embargo for this release has been lifted.

A biologist at Washington University in St. Louis has shown that for some fish species, females prefer males with larger sexual organs, and actually choose them for mating. That does not exclude males with an average-sized sex organ, called a gonopodium. These fish out-compete the larger-endowed males in a predator-laden environment because they have a faster burst speed than the males with larger genitalia, who lose out because the size of their organ slows them down, making them ripe for capture by larger fish.

Brian Langerhans, Washington University biology graduate student in Arts & Sciences, has performed studies on mosquitofish (guppy-like fish, about an inch long) and found that female mosquitofish spend 80 percent more time with males who have a large gonopodium.

"A male with a larger gonopodium has a higher chance of mating, but in a predator environment he has a higher probability of dying," Langerhans said. "That's the cost, the tradeoff. On the other hand, we found that in predator-free environments gonopodia size was larger, as there is minimal cost for large genitalia in that environment. Bigger is better for mating, but smaller is better for avoiding predation."

Langerhans and colleagues reported their findings in the May 9 on-line issue of Proceedings of the National Academy of Sciences.

Langerhans specializes in the study of ecological factors that shape the evolution of body forms. Male genitalia are more variable than just about any other body form studied, and there is a significant cadre of evolutionary biologists studying this field because genital shape morphology is one of the chief characters that taxonomists use to distinguish between closely related species.

Striking diversity

Researchers have thought for about 20 years that the striking diversity of genital form results from p
'"/>

Contact: Tony Fitzpatrick
314-935-5272
Washington University in St. Louis
10-May-2005


Page: 1 2 3 4

Related biology news :

1. Certain blood pressure-lowering drugs reduce diabetes risk in Hispanic patients
2. Certain gene variation associated with better mobility for older individuals who exercise
3. Certain genetic test helps detect mutations that may be missed by conventional DNA test
4. Eat fish -- especially if you drink high levels of alcohol
5. Stem cell specialists face questioning
6. Cancer research specialist and HSPH professor awarded Medal of Honor from WHO cancer agency
7. Cannibalism of the young allows individual fish to specialize
8. Researchers find level of special protein is critical to proper formation of muscles
9. New study suggests special cocoa may lead to sustained improvement in blood vessel function
10. Environments resilient in the face of hurricanes, but questions remain, says journal special issue
11. October MCP: A special issue on Clinical Proteomics

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


(Date:7/10/2020)... CHICAGO (PRWEB) , ... July 09, 2020 , ... Today ... Umami Advantage, which will share insight on the “fifth taste” phenomenon that is revolutionizing ... snacks. The Umami Advantage will be live on Monday, July 13, 2020 at11:00 AM ...
(Date:7/1/2020)... ... July 01, 2020 , ... Cure Glioblastoma, ... glioblastoma—the most common and aggressive adult brain cancer—announced today the appointments of its ... are charged with supporting the organization’s initiatives and overall vision. , "Senior Fellows ...
(Date:6/23/2020)... MILTON KEYNES, England (PRWEB) , ... June 23, ... ... operations in Africa supporting sustainable healthcare, and Renovagen Ltd, a UK supplier and ... rapid response project to support testing operations in the fight against the COVID-19 ...
Breaking Biology News(10 mins):
(Date:7/1/2020)... CHARLOTTE, N.C. (PRWEB) , ... June 29, 2020 ... ... has reported year to date growth of 40% in 2020, despite many obstacles ... medical technology, MedShift aims to increase revenue for its partnered medical practices and ...
(Date:7/1/2020)... ... June 30, 2020 , ... ... insights, today announced that the launch of a new clinical diagnostics ... about the tumor microenvironment (TME). , “Flagship’s TissueInsight is a service that ...
(Date:6/28/2020)... (PRWEB) , ... June 25, 2020 , ... ... are racing to develop a vaccine or drug treatment. In an effort to ... has publicly released the world’s largest imaging dataset portraying therapeutic compound effects ...
(Date:6/28/2020)... ... June 26, 2020 , ... ... solutions providers, today announced its strong opposition to the recently introduced bicameral ... a blanket ban on most federal use of nearly all biometric and related ...
Breaking Biology Technology:
Cached News: