Navigation Links
Older female fish prefer imperfect male mates, study finds

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 projec
'"/>

Source:Ohio University


Page: 1 2 3

Related biology news :

1. Older men treated for early prostate cancer live longer than those who are not
2. Older fathers more likely to have autistic children
3. Mother birds increase progesterone to hatch females
4. Decisions, decisions: Male or female?
5. Looks matter to female barn swallows
6. Picky female frogs drive evolution of new species in less than 8,000 years
7. Male elephants woo females with precise chemistry
8. New study explores beetle species with two forms of females
9. Male rivalry increases when females at most fertile, say researchers
10. Brain differences could explain why males and females experience pain relief differently
11. UCLA study finds same genes act differently in males and females
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Older female fish prefer imperfect male mates study finds

(Date:4/2/2015)... 2015 Fingerprint Cards (FPC) has ... from the distributor World Peace Industrial Group (WPI), part ... although the major part of the shipments will take ... by smartphone manufacturers in China . ... the communicated revenue guidance of + 1 000 MSEK for ...
(Date:3/30/2015)... DUBLIN , Mar. 26, 2015 Research and ... addition of the "Global Gesture Recognition Market in ... The analysts forecast the Global Gesture Recognition market ... 12.8% over the period 2013-2018. Gesture recognition ... respond to different gestures of an individual. Gesture recognition ...
(Date:3/24/2015)... March 24, 2015   Crossmatch ™, a ... announced that its U.are.U ® 4500 Fingerprint ... Goorin Bros . to achieve PCI compliance for ... access to the POS terminal, protecting the retailer ... data breaches. With one-third of ...
Breaking Biology News(10 mins):Fingerprint Cards Receives Touch Fingerprint Sensor Order of SEK 110 Million 2Global Gesture Recognition Market in Automotive Sector Report 2015 - Growing Number of Partnerships 2Crossmatch Fingerprint Readers Help Retailer Prevent Data Breaches at Point-of-Sale 2
... living cell needs both to build new and to ... number of intracellular systems work in concert to keep ... proteins. When proteins or peptides mutate, they can present ... environment. In Huntington's disease (HD) the disease provoking mutation ...
... international group of scientists has announced a major ... the activities of genes in living organisms. ... to describe the complex events that occur when ... Understanding these events is crucial for developing new ...
... they won't be able to understand the brain until they ... billions of neurons are interconnected. Now, researchers at the Salk ... be a major hurdle to preparing that chart: identifying all ... March 1 issue of the journal Neuron, the researchers describe ...
Cached Biology News:Proteasome activator enhances survival of Huntington's disease neuronal model cells 2Uniform language for describing genes of pathogenic and beneficial microbes 2Uniform language for describing genes of pathogenic and beneficial microbes 3Deconstructing brain wiring, one neuron at a time 2Deconstructing brain wiring, one neuron at a time 3
(Date:5/1/2015)... May 1, 2015 According ... Market by Product (Equipment, Consumables), by Type (Monoclonal, Polyclonal), ... Labs, Research Institutes) - Analysis & Global Forecast ... the global Antibody Production Market for the forecast ... expected to reach $2.572 Billion by 2019 from ...
(Date:4/30/2015)... 2015   Tamir Biotechnology , a leading developer ... its Ebola antiviral therapy program. Clinical ... currently being evaluated and considered by a number of ... During the first quarter of 2015, the company participated ... The Evaluation of Potential Treatments and Vaccines For Ebola ...
(Date:4/30/2015)... Va. , April 30, 2015 Oxford ... senior debt to life sciences and healthcare services companies, ... secured term loan agreement with Celula, Inc., a diagnostic ... major diseases, enabling better patient care and improved outcomes. ... the development and expand the commercialization of its products ...
(Date:4/30/2015)... SAN DIEGO , April 30, 2015 /PRNewswire/ ... company engaged in the development of biosimilar therapeutics ... today announced the closing of its previously announced ... common stock at a public offering price of ... full by the underwriters of their option to ...
Breaking Biology Technology:Antibody Production Market worth $2.572 Billion by 2019 2Antibody Production Market worth $2.572 Billion by 2019 3Antibody Production Market worth $2.572 Billion by 2019 4Tamir Biotechnology Provides Update on TMR004 Development Against Mutating Ebola 2Tamir Biotechnology Provides Update on TMR004 Development Against Mutating Ebola 3Tamir Biotechnology Provides Update on TMR004 Development Against Mutating Ebola 4Oxford Finance Provides $10 Million Debt Financing to Celula 2Pfenex Inc. Announces Closing of Public Offering of Common Stock and Full Exercise of Underwriters' Option to Purchase Additional Shares 2
... DEERFIELD, Ill., Dec. 3 Today, the International Society,for ... stem cell researchers, released new guidelines for the responsible,development ... A,Commentary article that summarizes the Guidelines for the ... Press in the December issue of Cell,Stem Cell, the ...
... 3 NeoStem, Inc.,(NYSE Alternext US: NBS), which is pioneering ... for future medical need,today announced that it has completed an ... priced at $1.25 per unit with each unit,consisting of one ... share of,common stock at $1.75 per share. , ...
... 3 The William Lehman Injury Research,Center ... at the, University of Miami /Jackson Medical ... and Advanced Technology Research Center (TATRC); the ... Association (ATA) and,Qualcomm, through its Wireless Reach(TM) ...
Cached Biology Technology:The International Society for Stem Cell Research Releases New Guidelines to Shape Future of Stem Cell Therapy 2The International Society for Stem Cell Research Releases New Guidelines to Shape Future of Stem Cell Therapy 3The International Society for Stem Cell Research Releases New Guidelines to Shape Future of Stem Cell Therapy 4NeoStem Completes $500,000 Private Placement With Strategic Investor 2NeoStem Completes $500,000 Private Placement With Strategic Investor 3Advanced Technologies and Wireless Telecommunications Enhance Care and Medical Training at the Ryder Trauma Center in Miami 2Advanced Technologies and Wireless Telecommunications Enhance Care and Medical Training at the Ryder Trauma Center in Miami 3Advanced Technologies and Wireless Telecommunications Enhance Care and Medical Training at the Ryder Trauma Center in Miami 4Advanced Technologies and Wireless Telecommunications Enhance Care and Medical Training at the Ryder Trauma Center in Miami 5Advanced Technologies and Wireless Telecommunications Enhance Care and Medical Training at the Ryder Trauma Center in Miami 6