Navigation Links
Variety is the spice of life: too many males, too little time...
Date:4/23/2008

Female Australian painted dragon lizards are polyandrous, that is, they mate with as many males as they can safely get access to. This promiscuous behaviour is often found in species where male quality is dubious and there are high levels of infertility in the male population. Female painted dragons possess the remarkable ability to store sperm inside their reproductive tract that remain viable for a considerable amount of time, so that the sperm of different males actually compete with each other to fertilise her eggs.

Male painted dragons are highly distinctive and brightly coloured and what is particularly fascinating about them is that they occur in two different colours - red or yellow-headed. From an evolutionary perspective this seems intuitively puzzling as usually natural selection does an excellent job of removing inferior versions of an organism out of the ensuing population, ensuring its ultimate demise. With painted dragon lizard males however, both versions persist in the population, suggesting that each type of male somehow manages to acquire a mate and successfully reproduce equally well.

Mo Healey, Tobias Uller and Mats Olsson of Wollongong University, carried out female choice experiments on single males of different colours, and discovered that females did not preferentially associate with either coloured male. However, when females were allowed to choose between pairs of males of the same versus different colours, they preferred to associate with male pairs that were polymorphic, i.e., one red and one yellow male. The level of individual recognition in this species is unknown and often when males and females assess each other in the wild it is initially from a distance, meaning that visual cues are very important. Healey et al. propose that by mating with one yellow and then one red male (or vice versa), female painted dragons are making sure that they are in fact mating with two different males and not the same male twice. This preference could therefore contribute to the maintenance of both male types within the population.


'/>"/>

Contact: Davina Quarterman
dquarterman@wiley.com
Wiley-Blackwell
Source:Eurekalert

Related biology news :

1. Hope among patients with ALS may take a variety of forms
2. Popular apple variety harbors unusual cell growth
3. Eat chocolate, drink wine, add fun to life: SLU geriatrician shares secrets of staying young
4. Vaginal reconstruction not needed for most inter-sex females, Hopkins study shows
5. Ancient lemurs little finger poses mystery
6. Book on little-known species and conservation provides guidance to managers and others
7. Choosing dry or wet food for cats makes little difference
8. Mothers little helpers
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/11/2017)... , April 11, 2017 Crossmatch®, a ... authentication solutions, today announced that it has been ... Research Projects Activity (IARPA) to develop next-generation Presentation ... "Innovation has been a driving force ... program will allow us to innovate and develop ...
(Date:4/11/2017)... Florida , April 11, 2017 ... a security technology company, announces the appointment of independent Directors ... Bendheim to its Board of Directors, furthering the company,s ... ... of NXT-ID, we look forward to their guidance and benefiting ...
(Date:4/5/2017)... -- Today HYPR Corp. , leading innovator in ... the HYPR platform is officially FIDO® Certified . ... that empowers biometric authentication across Fortune 500 enterprises and ... 15 million users across the financial services industry, however ... suites and physical access represent a growing portion of ...
Breaking Biology News(10 mins):
(Date:4/27/2017)... ... April 27, 2017 , ... ... Therapeutics Summit ( http://www.paintherapeuticsummit.com ) is coming to San Diego, CA on September ... conference to learn about the latest advances in the treatment of various types ...
(Date:4/27/2017)... ... April 27, 2017 , ... ... , joined other scientists, researchers, engineers, and industry professionals in visiting U.S. Congressional ... ability to compete in the world photonics industry. , This year, National ...
(Date:4/26/2017)... ... April 26, 2017 , ... Looking for gift ideas ... events company, offers one-of-a-kind gifts, ranging from gourmet cooking experiences to Farmer’s Market ... guests leave inspired with new cooking tips and techniques, thanks to Chef Jodi ...
(Date:4/26/2017)... ... April 26, 2017 , ... Baltimore bio tech ... mail security screening solution at the National Postal Forum 2017 in Baltimore, Maryland, ... fast, highly accurate, easy to use and low cost threat detection solution for ...
Breaking Biology Technology: