HOME >> BIOLOGY >> NEWS
Older female fish prefer imperfect male mates, study finds

ATHENS, Ohio There's hope for the less-than-perfect male if you're a swordtail fish, that is. As the size and age of female swordtail fish increase, so does the preference for males with asymmetrical markings, according to a new Ohio University study.

Molly Morris, associate professor of biological sciences, and colleagues found that older female swordtails spent more time with asymmetrically striped males than symmetrical males when offered a choice. These findings are the first to contradict previous studies showing that females tend to prefer males with symmetrical markings, which in this case are black bars on each side of the body. Scientists have suggested that symmetrical markings are a sign of genetic fitness.

The new study provides evidence that visual cues are not the only thing driving mate selection, however. The findings also suggest that "females may not have the same mating preferences throughout their lives," Morris said. Funded by the National Science Foundation and the Research Challenge Program at Ohio University, the paper has been published online in Biology Letters and will appear in next month's print edition.

Morris' findings raise the question of whether there may be a change in mating preference over time in other species as well. In a current study on human attraction, for example, the average age of the females and males tested for preference for symmetrical faces was only 20.3 years and 19.5 years, she said. The swordtail fish used in the latest research are two species of Mexican fish, Xiphophorus cortezi and Xiphophorus malinche. Because the genetic makeup of these fish is well known, researchers often use them to examine genetic causes of behavior.

To conduct the study, Morris and colleagues exposed females of both species to video animations of male fish, one with an equal number of bar markings on each side of the body, and one with an unequal number of bars on each side. The animations simultaneously were
'"/>

Contact: Andrea Gibson
gibsona@ohio.edu
740-597-2166
Ohio University
15-Nov-2005


Page: 1 2 3

Related biology news :

1. Older men may not live as long if they have low testosterone
2. Older adults may reduce risk of metabolic syndrome by eating more whole grains
3. Cardio exercise benefits in male vs. female hearts
4. The female advantage in kidney disease does not extend to diabetic women
5. Disabling a sensory organ prompts female mice to act like male mice
6. A sensory organ, not the brain, differentiates male and female behavior in some mammals
7. MGH researchers confirm that bone marrow restores fertility in female mice
8. Male or female factor infertility -- men suffer just the same
9. CU study reveals why starling females cheat
10. Philandering female felines forgo fidelity
11. Hearts of male and female rainbow trout are different

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


(Date:9/3/2020)... ... September 03, 2020 , ... ... that an extensive third-party assessment of the company’s security practices has been completed. ... federal security regulations. The comprehensive evaluation reviewed Litmus’ processes and systems, assessing them ...
(Date:8/26/2020)... SOMERSET, N.J. (PRWEB) , ... August 25, 2020 ... ... technologies, development, and manufacturing solutions for drugs, biologics, cell and gene therapies, and ... the upcoming 16th Annual PEGS Boston Virtual Conference & Expo, taking place between ...
(Date:8/21/2020)... ... August 18, 2020 , ... Sentien Biotechnologies, ... that the U.S. Food and Drug Administration (FDA) has approved the company’s Investigational ... the treatment of severe COVID-19. Approval of this IND allows Sentien to initiate ...
Breaking Biology News(10 mins):
(Date:8/12/2020)... ... August 11, 2020 , ... ... available for free its new white paper – Simulated Transport Methodologies. Regulatory ... today’s biologics licensing application (BLA). In response, Modality Solutions shares an explanation ...
(Date:8/3/2020)... ... , ... ERT, the global leader in clinical ... one of the 100 most inspiring individuals in the life-sciences industry by PharmaVoice. ... on how they have inspired their colleagues and affected positive changes in their ...
(Date:7/31/2020)... COLLEGE STATION, Texas (PRWEB) , ... July 29, ... ... pre-qualified cleanroom solutions today announced the launch of its new tagline, “BUILDING FOR ... within the biopharmaceutical industry and around the globe, requiring fast track capacity to ...
(Date:7/31/2020)... ... July 29, 2020 , ... Editas Medicine, ... provider of advanced delivery technologies, development, and manufacturing solutions for drugs, biologics, cell ... into a strategic partnership whereby Catalent will provide support for the development, manufacturing, ...
Breaking Biology Technology:
Cached News: