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:8/28/2014)... in German . ... with the help of sophisticated assembly lines. Mobile assembly carriers, ... part of these assembly lines. In the case of a ... stages arranged in a precise spatial and chronological sequence, resulting ... , The creation of such an assembly line at molecular ...
(Date:8/28/2014)... to alert the world to Global Warming, has called ... stored underground. He says that Carbon Capture, combined with ... to avoid global warming getting out of control over ... York) made the call during his presentation to the ... are meeting to discuss Carbon Capture and Storage. ...
(Date:8/28/2014)... action is needed to ensure safeguards are in place ... PLOS ONE , researchers from Monash University, Stellenbosch ... combining results from different studies - to look at ... to determine whether they actually protect biodiversity. , ... an area from human exploitation made common sense, however, ...
Breaking Biology News(10 mins):Nanoscale assembly line 2Nanoscale assembly line 3Global warming pioneer calls for CO2 to be taken from atmosphere and stored underground 2Protected areas proven to protect biodiversity 2
... can significantly improve blood markers of cardiovascular health in ... of Human Hypertension . The researchers measured ... remodeling of arteries that normally occur after tissue damage, ... levels of two of these markers dropped significantly in ...
... Colo., USA GEOLOGY ends 2012 with ... and locations, including Mercury; Naica Cave, Mexico; Diamantina, Brazil; ... Bay and Uummannaq Fjord, central West Greenland; the California ... Torfajkull, Iceland; the U.S. Sierra Nevada; Spain; New Zealand; ...
... Worcester, Mass. In the worldwide battle to curtail ... of the developing world, drug after drug has fallen by ... it. Only artemisinin, derived from the sweet wormwood plant, ... is expensive to produce (particularly when combined with other antimalarial ...
Cached Biology News:Strength training improves vascular function in young black men 2Strength training improves vascular function in young black men 3GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 2GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 3GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 4GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 5GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 6GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 7GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 8GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 9GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 10GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 11GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 12GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 13GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 14GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 15GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 16GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 17GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 18GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 19GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury 20New whole plant therapy shows promise as an effective and economical treatment for malaria 2New whole plant therapy shows promise as an effective and economical treatment for malaria 3New whole plant therapy shows promise as an effective and economical treatment for malaria 4
(Date:8/28/2014)... A new research platform uses a laser ... structures undergoing stress and heating, an approach ... for microelectronics and batteries., This new technique, ... how heating and the surface stress of ... have discussed the merits of surface-stress influence ...
(Date:8/28/2014)... Aug. 28, 2014   SunTrust Robinson Humphrey ... veterans to its equity research team in biotechnology ... expansion in equity research demonstrates our commitment to ... to enhance their investment decision making," said ... "We continue to make significant investments in differentiated ...
(Date:8/28/2014)... Vt. (PRWEB) August 28, 2014 ... testing around the world is available from Strategic ... diagnostics companies. “ Industrial Microbiology Market Review, Fourth ... Industrial Market ” (IMMR—4) tracks and compares microbiology ... in North America, Europe and Asia, and forecasts ...
(Date:8/27/2014)... Salt Lake City, Utah (PRWEB) August 27, 2014 ... new construction that will expand its current Salt Lake ... operations currently underway outside of Utah to ultimately create ... the next 20 years. , “Utah is home ... many of whom can be credited with Varian’s success ...
Breaking Biology Technology:New analytical technology reveals 'nanomechanical' surface traits 2New analytical technology reveals 'nanomechanical' surface traits 3SunTrust Robinson Humphrey Expands Equity Research in Healthcare and Energy 2SunTrust Robinson Humphrey Expands Equity Research in Healthcare and Energy 32 Billion Industrial Microbiology Tests Conducted for Product Quality and Safety Worldwide 22 Billion Industrial Microbiology Tests Conducted for Product Quality and Safety Worldwide 3Varian Medical Systems Groundbreaking on Facility Expansion Triggers Influx of New Jobs to Salt Lake 2Varian Medical Systems Groundbreaking on Facility Expansion Triggers Influx of New Jobs to Salt Lake 3
... SAN DIEGO and INDIANAPOLIS, Oct. 19,  2011 ... and Eli Lilly and Company (NYSE: LLY ) ... has approved a new use for BYETTA® (exenatide) injection. BYETTA ... with or without metformin and/or a thiazolidinedione (TZD), in conjunction ...
... Process automation specialist Endress+Hauser has acquired a stake in ... distributes sensors, hardware and software for bioprocess engineering. ... the area of biotechnology through this cooperation. "Biotechnological procedures ... not only in the life sciences industry but also ...
... Building on earlier work showing how nanowires carved ... photons, researchers have developed a scalable manufacturing process ... enable even greater photon control. The development ... by setting the stage for diamond-based microchips. ...
Cached Biology Technology:BYETTA® Approved for Use with Insulin Glargine in the U.S. 2BYETTA® Approved for Use with Insulin Glargine in the U.S. 3BYETTA® Approved for Use with Insulin Glargine in the U.S. 4BYETTA® Approved for Use with Insulin Glargine in the U.S. 5BYETTA® Approved for Use with Insulin Glargine in the U.S. 6BYETTA® Approved for Use with Insulin Glargine in the U.S. 7BYETTA® Approved for Use with Insulin Glargine in the U.S. 8Endress+Hauser and Finesse Solutions Form Strategic Partnership - Swiss Process Automation Provider Invests in US Biotech Company 2Endress+Hauser and Finesse Solutions Form Strategic Partnership - Swiss Process Automation Provider Invests in US Biotech Company 3Diamonds, silver and the quest for single photons 2Diamonds, silver and the quest for single photons 3
These 25x25 square No.1 Corning cover glasses are made from No. 0211 zinc titania glass and are 0.16 to 0.19mm thick. • Approx. Pcs Oz : 102...
... Life Science FLA-8000 Fluorescent Image Analyzer features ... single laser imaging system. This powerful new ... with fluorescent dyes or radioisotopes at resolutions ... laboratories. Speed, image quality and flexibility make ...
...
The model 55D Rocking Shaker provides the same Reliable quality as the 55S, but double the value. The 55D gives you an additional platform with a height of 3.25 in....
Biology Products: