Navigation Links
Male bushcrickets are in charge when it comes to sex
Date:12/14/2012

This press release is available in German.

All a question of timing: When bushcrickets mate, the male attaches a sticky package, the so-called spermatophore, to the female's abdomen. Alongside the sperm themselves, this 'bridal present' consists of a protein-rich mass that the female eats after mating. It then takes several hours for the sperm to find their way into the female's reproductive tract. But, who decides when that will happen? A study by the Bielefeld biologists Professor Dr. Klaus Reinhold and Dr. Steven Ramm suggests that it is the male who determines the dynamics of this process even when he has long 'hopped off' somewhere else. They have now published their results in the online first version of the journal Behavioural Ecology and Sociobiology.

In contrast to direct sperm transfer, the use of a spermatophore could grant the female more influence over the fertilization or non-fertilization of her eggs. However, the results of the Bielefeld study cast doubt on this assumption. They suggest a high degree of male control over this decisive stage in reproduction. For their study, Professor Dr. Klaus Reinhold and Dr. Steven Ramm from Bielefeld University paired males and females from two subspecies of the bushcricket Poecilimon veluchianus in whom the time between pairing and sperm transfer differ. Whereas in the subspecies Poecilimon veluchianus minor, sperm are transferred within the first three hours, the transfer in Poecilimon veluchianus veluchianus starts only after four hours. If the two subspecies are interbred the researchers thought then the number of transferred sperm after three hours would indicate whether it is the male or the female who determines how long this transfer takes.

The researchers mated nine to twelve pairs in each of the four possible combinations of Poecilimon veluchianus minor and Poecilimon veluchianus veluchianus. Three hours after mating, they examined how many sperm they could find in the female's reproductive tract. The result: the sperm from the males of the 'faster' subspecies Poecilimon veluchianus minor could be found in the females of both subspecies. In contrast, the males in the 'slower' sub-species Poecilimon veluchianus veluchianus had transferred almost no sperm at all to either type of female.

The researchers conclude from this experiment that the males control the speed of transfer over the sperm package. However, this does not automatically lead to the conclusion that the female is powerless. Females can also influence whether sperms are transferred by how quickly they eat the spermatophore. In addition, the larger the male, the larger the size of the sperm package, and this influences how long the females need to consume the protein. As a result, the sperm have more time to transfer to the female and the female's eggs have a greater chance of being fertilized by a 'high-quality' male. Professor Reinhold stresses, 'Our findings show that the females do not determine the transfer not that they could not do so.'


'/>"/>

Contact: Klaus Reinhold
klaus.reinhold@uni-bielefeld.de
49-521-106-2721
University of Bielefeld
Source:Eurekalert  

Related medicine news :

1. A second victim comes forward in the sexual assault charges filed against Dr. Mike Adam.
2. In children born with severe heart defect, surgical management has little effect on neuro outcomes
3. Early treatment improves outcomes in rare, often undiagnosed form of encephalitis
4. Intensivists at night improve patient outcomes in some ICUs, says Pitt/UPMC team
5. Phone contact with nurses linked with better outcomes for women with gestational diabetes
6. Group B streptococcal meningitis has long-term effects on childrens developmental outcomes
7. Hospital volume and surgeon specialty influence patient outcomes
8. MDS researchers join forces to advance patient treatments and outcomes
9. Future reproductive outcomes for women who have had an ectopic pregnancy
10. Integrated Services Becomes Preferred Rental Provider for Rural/Metro Corporation
11. Texas Back Institute Becomes Official Spine Specialist for FC Dallas and the Frisco RoughRiders
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Male bushcrickets are in charge when it comes to sex
(Date:3/24/2017)... ... March 24, 2017 , ... In just ... EcoQube Frame vertical micro-veggies garden on Kickstarter . Surpassing the $100,000 milestone ... with nearly 2,000 consumers (and counting) already backing the campaign. , “We ...
(Date:3/24/2017)... ... March 24, 2017 , ... Viewers who like to educate themselves on ... cultural practices, goods, services, and societal issues tend to appreciate and love the "Informed" ... practice of utilizing running events for causes around the world. , Running ...
(Date:3/24/2017)... ... 2017 , ... “End Time GPS”: a dauntless and enlightened study of ... GPS” is the creation of published author, Wesley Gerboth, a World War II veteran, ... space-vehicle projects. Now, at age ninety-one, he shares the Wisdom God bestowed upon him ...
(Date:3/23/2017)... , ... March 23, 2017 , ... A recent report ... entry into teacher preparation programs. The NCTQ report suggests, based on a review of ... would significantly improve teacher quality in the U.S. It argues that this higher bar ...
(Date:3/23/2017)... ... , ... The IoT (Internet of Things) is revolutionizing the way the world ... businesses and individual consumers alike. Laboratories can maximize their profit margin by increasing ... $4 trillion to $11 trillion dollars by the year 2025. McKinsey expects the IoT ...
Breaking Medicine News(10 mins):
(Date:3/24/2017)... SAN DIEGO , March 24, 2017  GenomeDx ... (Genomics Resource Information Database) and Decipher® Prostate Cancer Classifier ... Annual European Association of Urology (EAU) Congress held March ... . The Annual EAU Congress is ... and most comprehensive research in the urological field. ...
(Date:3/24/2017)... , March 23, 2017  Provectus Biopharmaceuticals, ... the "Company"), a clinical-stage oncology and dermatology biopharmaceutical ... Definitive Financing Commitment Term Sheet (the "Definitive Financing") ... group of the Company,s stockholders, who are referred ... in a Form 8-K filed with the Securities ...
(Date:3/23/2017)... , March 23, 2017 Mosaic Life Care, based in St. ... registration process across its network of 58 clinics, located in 22 cities, and its ... and innovative ways to improve the delivery of health care to its patients, including ... ... Mosaic Life Care St. Joseph Medical Center ...
Breaking Medicine Technology: