Navigation Links
Sneaky squid: Why small males have big sperm
Date:8/10/2011

Male squid (Loligo bleekeri) employ different reproductive strategies depending on their body size. Research published in BioMed Central's open access journal BMC Evolutionary Biology shows that the divergent mating behavior of male squid has resulted in the evolution of different sperm sizes.

Large male squid compete for females by courting them with flashy skin color-change displays. Once a female has chosen her partner they mate in an above and below position so that the male can place his sperm inside the female's oviduct. He remains with the female until she spawns, ensuring that his sperm fertilize her eggs and that no other males have a chance to mate with her. At the moment a female lays her eggs, small 'sneaker' males rush in and mate with her, head to head. These small males place packages of sperm by the female's mouth in the hope that their sperm have a chance of fertilizing the eggs as they leave the female's body.

When researchers from London and Japan looked at the sperm produced by small sneaker males and large consort males they discovered that the sperm produced by the sneaker males was larger than that of the consorts. Dr Yoko Iwata from University of Tokyo said, "Sperm size is likely to be an adaptation to fertilization environment, either inside the female or externally, rather than competition between sperm, because the fertility and motility of sneaker and consort sperm were the same."

Overall, the larger males' strategy resulted in higher paternity rates - but for smaller males, who cannot win a female by fair means, being sneaky gives them a chance of passing on their genes.


'/>"/>

Contact: Dr. Hilary Glover
hilary.glover@biomedcentral.com
44-203-192-2370
BioMed Central
Source:Eurekalert

Page: 1

Related biology news :

1. TREW Marketing Introduces Smart Marketing for Engineers, a Free Guidebook for Small Businesses Targeting Technical Audiences
2. Study shows small-scale fisheries impact on marine life
3. Being small has its advantages, if you are a leaf
4. Researchers engineer functioning small intestine in laboratory experiments
5. Treatment approach to human Usher syndrome: Small molecules ignore stop signals
6. Transport Phenomena and Membrane Digestion in Small Intestinal Mucosa by Pensoft
7. Oceans harmful low-oxygen zones growing, are sensitive to small changes in climate
8. Wired for sound: A small fishs brain illustrates how people and other vertebrates produce sounds
9. Small change makes a big difference for ion channels
10. Caltech researchers build largest biochemical circuit out of small synthetic DNA molecules
11. Small insects attacks and kill amphibians much bigger than themselves
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/3/2016)... , Feb. 3, 2016 ... the addition of the "Emotion Detection ... Machine Learning, and Others), Software Tools (Facial ... Areas, End Users,and Regions - Global forecast ... --> http://www.researchandmarkets.com/research/d8zjcd/emotion_detection ) has ...
(Date:2/2/2016)... , Feb. 2, 2016 Checkpoint ... that Rising Market Are you interested in ... forecasts revenues for checkpoint inhibitors. Visiongain,s report gives ... submarket, product and national level. Avoid falling ... what progress, opportunities and revenues those emerging cancer ...
(Date:2/2/2016)... , Feb. 2, 2016  Based on ... Frost & Sullivan recognizes US-based Intelligent Retinal Imaging ... & Sullivan Award for New Product Innovation. IRIS, ... North America , is poised ... rapidly growing diabetic retinopathy market. The IRIS technology ...
Breaking Biology News(10 mins):
(Date:2/8/2016)... -- NanoViricides, Inc. (NYSE MKT: NNVC) (the "Company"), a nanomedicine company developing ... MPH, will present information about the company,s programs at the BIOCEO ... New York City . --> ... 5:30PM EST. Registered attendees can request a one on one meeting ... --> New York City . ...
(Date:2/8/2016)... -- --> --> ... ultra-rapid Point-Of-Care (POC) molecular diagnostics company, today announces that it ... test to be launched on the Company,s io® platform. By ... test is now cleared for sale within the European Union. ... of the io® CT test signals a new era in ...
(Date:2/5/2016)... , Feb. 5, 2016 ATCC, the ... poised to assist the medical and life science researchers ... Zika Virus infection.   CDC website . ... --> Zika virus is a single-stranded RNA virus ... the West Nile, Dengue and Chikungunya Viruses. Zika virus ...
(Date:2/5/2016)... SAN FRANCISCO , February 5, 2016 ... AMBS), a biotechnology company focused on developing products ... it has requested Rare Pediatric Disease Designation (RPDD) from ... retinitis pigmentosa (RP) with MANF. MANF was previously granted ... December 2014. --> Amarantus BioScience Holdings, Inc. ...
Breaking Biology Technology: