Navigation Links
Variety is the spice of life: too many males, too little time...

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

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:
(Date:9/30/2015)... , Sept. 30, 2015  With nearly 300,000 ... number of new SCIs estimated to reach 12,500 annually, ... Southern California Resource Services for Independent Living (SCRS-IL) ... in California opening doors to ... of programs and services, notably assistive technology services and ...
(Date:9/29/2015)... SUNNYVALE, Calif. , Sept. 29, 2015 ... technology improves employee productivity while also saving energy ... features such as Low Power Active Mode and embedded ... workplace transformation Fujitsu today shows that ... of new and refreshed models to its enterprise desktop ...
(Date:9/28/2015)... 2015  The monitoring of vital signs, such ... is an essential component of patient assessment. Changes ... in a patient,s condition. However, in general care ... taken during routine observation rounds only once every ... between these observation rounds, the warning signs can ...
Breaking Biology News(10 mins):
(Date:10/12/2015)... octubre de 2015 El 8 de octubre, ... récord en el congreso con su declaración acerca del ... Plasma Awareness Week (IPAW), que se celebrará del 11 ... la Plasma Protein Therapeutics Association (PPTA) y ... , Aumentar la concienciación mundial acerca de la donación ...
(Date:10/12/2015)... 2015 LabStyle Innovations Corp. ... today announced its Medical Director, Dr. Moshe Kamar ... 5th EAI International Conference on Wireless Mobile Communication ... in mobile and wireless technologies," the conference will take ... October 14 - 16, 2015. The conference is endorsed ...
(Date:10/12/2015)... (PRWEB) , ... October 12, 2015 , ... ... today that Dr. Srini Srinivasan, has joined the firm as a Premier Expert ... professional stature enable them to bring extraordinary value to the company's clients. ...
(Date:10/11/2015)... ... October 11, 2015 , ... ... has been officially launched and multiple surgeries have been completed with this new ... of the Neuroscience & Spine Center of the Carolinas. The Revolution™ Spinal ...
Breaking Biology Technology: