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:9/15/2014)... Mass. (September 15, 2014) The so-called central ... makes proteinhas long provided a simplified explanation for ... living organisms. , In reality, of course, ... schema first articulated nearly 60 years ago by ... double-helix structure. For one, there are multiple types ...
(Date:9/15/2014)... both plants and animals alike. , Understanding just how ... to the design of better drugs for diabetes patients ... vegetables farmers are able to grow. Stanford University researchers ... cell by piecing together proteins slightly wider than the ... determine the size, shape and orientation of one of ...
(Date:9/15/2014)... will allow us to better understand how the ... scenarios and provide the type of environmental data ... and siting of protected areas," said Paula Whitfield, ... Coastal Ocean Science (NCCOS) and lead author of ... within the temperate-tropical transition zone, where historically, both ...
Breaking Biology News(10 mins):Scientists discover RNA modifications in some unexpected places 2X-rays unlock a protein's SWEET side 2X-rays unlock a protein's SWEET side 3Study finds warming Atlantic temperatures could increase range of invasive species 2
... D.C., November 21, 2010 -- For centuries, hunters have imitated ... carving wooden bird calls. Now a team of physicists at ... characteristics of real bird song with a simple physical model ... know if you [could] build a simple device, which has ...
... baby,s first blurted "bowl!," for the word "ball" to the ... vocalizations is one of humankind,s most remarkable attributes -- and ... Not so for people who are afflicted with ... stigma of affected speech. Nor so for engineering professor Michael ...
... , Researchers in the United States have developed a ... from a patient,s own bone marrow. The research, published ... suffering from abnormally developed bladders, but also represents another ... research, led by Dr Arun Sharma and Earl Cheng ...
Cached Biology News:Simple rubber device mimics complex bird songs 2Air flows in mechanical device reveal secrets of speech pathology 2New study into bladder regeneration heralds organ replacement treatment 2
(Date:9/15/2014)... phase transitionsthink solid, liquid, and gasbut much ... drops. If phase transitions occur at the ... subtle fluctuations can dramatically transform a material. ... of Energy,s Brookhaven National Laboratory and Stony ... of absolute zero to isolate and probe ...
(Date:9/15/2014)... North Carolina State University have developed a technique for ... very low voltages, opening the door to a new ... The technique hinges on the fact that the oxide ... or removed acts as a surfactant, lowering the ... , The researchers used a liquid metal alloy of ...
(Date:9/15/2014)... , Sept. 15, 2014 Zymo ... viral transport solution for safe ambient temperature storage ... molecular testing. Importantly, the infectivity of agents in such ... maintaining the integrity of the viral nucleic acids ... the recent Ebola epidemic in West ...
(Date:9/15/2014)... September 2014 Die zweite jährliche ... 12. bis 18. Oktober stattfinden. Die IPAW ist ... Association (PPTA) und ihrer Mitgliedsunternehmen ... globale Bewusstsein für die Gewinnung von Quellplasma zu ... Retten und Verbessern von Leben zu würdigen ...
Breaking Biology Technology:Elusive quantum transformations found near absolute zero 2Elusive quantum transformations found near absolute zero 3Researchers control surface tension to manipulate liquid metals 2Safe storage and transport of Ebola, Mers-CoV, and other viruses: Groundbreaking viral inactivation solution capable of preserving nucleic acids 2Safe storage and transport of Ebola, Mers-CoV, and other viruses: Groundbreaking viral inactivation solution capable of preserving nucleic acids 3International Plasma Awareness Week feiert Spender und rückt seltene Krankheiten in den Mittelpunkt 2International Plasma Awareness Week feiert Spender und rückt seltene Krankheiten in den Mittelpunkt 3
... FRANCISCO, Calif., Nov. 1, 2010 diaDexus, Inc. (OTC ... focused on the development and commercialization of patent-protected ... cardiovascular disease, today announced that the company, formerly known ... Board under the ticker symbol (VXGN), has been renamed ...
... Nov. 1, 2010 Amgen (Nasdaq: AMGN ) ... Ph.D., will urge members of a U.S. Food and Drug ... to establish approval standards that ensure patient safety and follow ... policy will follow," Dr. Miletich said.  "Amgen believes biosimilars have ...
... ... ... var shortURL = ""; BitlyCB.alertResponse = function(data) ... first one. for (var r in data.results) { first_result = data.results[r]; break; } for (var key in first_result) { ...
Cached Biology Technology:diaDexus Announces Name Change From VaxGen 2diaDexus Announces Name Change From VaxGen 3Amgen to Provide Testimony at FDA Hearing on Biosimilars 2Amgen to Provide Testimony at FDA Hearing on Biosimilars 3Amgen to Provide Testimony at FDA Hearing on Biosimilars 4NEURO-BIOTECH CORPORATION: Updates and latest developments 2NEURO-BIOTECH CORPORATION: Updates and latest developments 3NEURO-BIOTECH CORPORATION: Updates and latest developments 4NEURO-BIOTECH CORPORATION: Updates and latest developments 5NEURO-BIOTECH CORPORATION: Updates and latest developments 6NEURO-BIOTECH CORPORATION: Updates and latest developments 7NEURO-BIOTECH CORPORATION: Updates and latest developments 8NEURO-BIOTECH CORPORATION: Updates and latest developments 9
... Daltonics and Bruker BioSpins Metabolic Profiler ... studies, and analysis of complex mixtures. ... an optional Avance NMR spectrometer and ... and statistical analysis for applications like:,Assessment ...
... movements in a Morris Water Maze. Tracks ... predefined sequence of trials.The Spatial Behavior line is ... video camera, frame grabber, and feature extraction software ... and up to 6 moving animals. Software ...
... Object Records behavior directed toward examining a novel ... a family of instruments all built around a ... and that can track two fields at once ... automatically extracts animal positions and records them, but ...
... ACS Reagent Grade C 19 H 9 ... 691.95 PRODUCT SPECIFICATIONS Form: Powder Clarity of ... pH 3.0 - Yellow pH 4.6 ... dye in agarose and acrylamide gel electrophoresis. ...
Biology Products: