Navigation Links
Male dwarf spiders make sure offspring is their own
Date:6/10/2014

Chastity belts were not first thought out in mediaeval times members of many animal groups have evolved similar mechanical safeguards to ensure their paternity. Male dwarf spiders, for instance, use mating plugs to block off the genital tract of the female they have just mated with. The larger and older the plug, the better the chances are that other males will not make deposits in a female's sperm storage organ, too. So says Katrin Kunz and co-authors of the Zoological Institute and Museum in Greifswald, Germany, in an article published in Springer's journal Behavioral Ecology and Sociobiology about this European spider.

This study builds on previous research led by co-author Gabriele Uhl that showed that dwarf spider males (Oedothorax retusus) insert mating plugs into the two copulatory ducts of the females they have mated with.

Kunz and her colleagues took these findings one step further to study just how well the mating plugs of the dwarf spider work. They discovered that the material the plugs are made of is transferred in a liquid state from the male to the female and that it needs to harden to a certain degree before it can withstand penetration or removal by a rival male. Remating trials were then staged after females received plugs of different sizes during a first round of copulation. Their effectiveness over periods of time was also tested. The female spiders were then scrutinized under a scanning electron microscope.

Overall, small plugs were found to be less effective than large plugs. This suggests that smaller portions of the translucent plug material can be more easily removed or overcome by a subsequent male that wants to mate. Small plugs are also least effective shortly after they are placed, which suggests that both size and the hardening of the material plays an important role in how well the plug works. Once plugs are older than a day they strongly serve to monopolize access to the duct that lead
'/>"/>

Contact: Joan Robinson
joan.robinson@springer.com
49-622-148-78130
Springer
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Protein involved in DNA replication, centrosome regulation linked to dwarfism, small brain size
2. Scientists from Mainz and Antananarivo describe Lavasoa Dwarf Lemur as new primate species
3. New dwarfism mutation identified in dogs
4. Scientists reconstruct ancient impact that dwarfs dinosaur-extinction blast
5. Genetic legacy of rare dwarf trees is widespread
6. Flying jewels spell death for baby spiders
7. Crabs, insects and spiders vulnerable to oil spill, but also resilient
8. Velvet spiders emerge from underground in new cybertaxonomic monograph
9. Vampire jumping spiders identify victims by their antennae
10. Are brown widows displacing black widow spiders around southern California homes?
11. Aussie wasp on the hunt for redback spiders
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Male dwarf spiders make sure offspring is their own
(Date:8/22/2014)... available in German . ... PCFs proteins are fixated in a way so as ... the HZB and Fudan University researchers are planning on ... materials. Their findings are being published today in the ... Proteins are sensitive molecules. Everyone knows that at ...
(Date:8/22/2014)... to purchase fuel cell cars from Toyota and other ... cars will run on hydrogen made from natural gas, ... Now scientists at Stanford University have developed a low-cost, ... produce hydrogen by water electrolysis. The battery sends ... water into hydrogen and oxygen gas. Unlike other water ...
(Date:8/21/2014)... new study of American singles found that during ... highest orgasm rates. On average, men experience orgasm ... orientation making little difference. For women, however, orgasm ... orgasm 62.9 percent of the time during sex ... varies with women,s sexual orientation, with lesbian women ...
Breaking Biology News(10 mins):Proteins: New class of materials discovered 2Stanford scientists develop a water splitter that runs on an ordinary AAA battery 2Stanford scientists develop a water splitter that runs on an ordinary AAA battery 3Orgasm rates for single women less predictable than men's, vary by sexual orientation 2Orgasm rates for single women less predictable than men's, vary by sexual orientation 3Orgasm rates for single women less predictable than men's, vary by sexual orientation 4
... of the brain and spine in America,s babies, particularly those of Hispanic origin, ... the B vitamin folic acid, according to a new petition filed with the ... Gruma Corporation Spina Bifida ... of Dimes Foundation , ...
... perennially covered in ice. It is exposed to severe ... and, during the winter, 24-hour darkness. But, for the ... To study them, Dr. Rachel Morgan-Kiss from the University ... to sample the ice-covered lake. The article describing her ...
... Academy at the University of Gothenburg, Sweden, have ... osteoporosis. The study, published in Nature Genetics ... shows among other interesting facts that women with a ... a more than 50 percent increased fracture risk. ...
Cached Biology News:Coalition petitions FDA to fortify corn masa flour with folic acid 2Coalition petitions FDA to fortify corn masa flour with folic acid 3Research on carbon-consuming life-forms in Antarctica published in JoVE 2Scientists have discovered genes that increase the risk of osteoporosis and fractures 2
(Date:8/22/2014)... August 22, 2014 Ophthalmic drug ... interesting and challenging endeavors as the anatomy, physiology ... properties to the foreign substances. Ocular drug delivery ... self medication and minimal use of needles; also ... drugs and provides specific targeting within the ocular ...
(Date:8/22/2014)... Research and Markets has announced the addition ... Reagents (Cloning, Epigenetics, PCR, Restriction Digestion, Sequencing) Market - ... The global molecular biology enzymes market was ... to grow at a CAGR of 13.74% to reach ... reagents find applications in a large number of fields ...
(Date:8/22/2014)... Toronto, Canada (PRWEB) August 22, 2014 ... traits in model organisms can be accelerated by ... design and manufacturing technologies, the custom SeqCap EZ ... such research. , Mr. Watson will additionally present ... seen with commercially available human and mouse exome ...
(Date:8/21/2014)... Rockville, MD (PRWEB) August 21, 2014 ... is making progress in its development of JRC-LAMP-vax, an ... red cedar pollen. Phase IC studies began this month ... solution to hay fever. , The Japanese red cedar ... million people in Japan. Mountain Cedar pollen wreaks similar ...
Breaking Biology Technology:Ocular Drug Delivery Technologies Market: Global Industry Analysis, Size, Share, Growth, Trends and Forecast 2014 - 2020 2Ocular Drug Delivery Technologies Market: Global Industry Analysis, Size, Share, Growth, Trends and Forecast 2014 - 2020 3Ocular Drug Delivery Technologies Market: Global Industry Analysis, Size, Share, Growth, Trends and Forecast 2014 - 2020 4Global Molecular Biology Enzymes, Kits, & Reagents (Cloning, Epigenetics, PCR, Restriction Digestion, Sequencing) Market - Forecast to 2018 2Global Molecular Biology Enzymes, Kits, & Reagents (Cloning, Epigenetics, PCR, Restriction Digestion, Sequencing) Market - Forecast to 2018 3Efficient Identification of Protein-Coding Variants in a Model Organism Through Exome Sequencing, New Webinar Hosted by Xtalks 2Relief for Allergy Sufferers Finally in Sight: Immunomic Therapeutics Closes in on Treatment for Hay Fever in Japan, U.S. 2Relief for Allergy Sufferers Finally in Sight: Immunomic Therapeutics Closes in on Treatment for Hay Fever in Japan, U.S. 3Relief for Allergy Sufferers Finally in Sight: Immunomic Therapeutics Closes in on Treatment for Hay Fever in Japan, U.S. 4
... Hemobag(R) prevents wastage by saving the patient,s own whole ... paper in a journal for,perfusionists, the health professionals who ... heart surgery, reports how Global Blood,Resources, online waste calculator ... seen with the "cell washing" machines most commonly used,during ...
... -- Using artificial sugar and some clever chemistry, University ... internal light comes from the sugar coating on their ... sugar chains, or carbohydrates, that coat cells is a ... a laboratory organism popular because its transparent embryos allow ...
... 5 VION PHARMACEUTICALS,INC. (Nasdaq: VION ) today ... 2008., The Company reported a net loss of ... ended March 31, 2008, compared with a net loss,of ... period in 2007.,Weighted-average common shares outstanding for the three ...
Cached Biology Technology:Global Blood Resources' On-Line Calculator Reveals Wasted Blood Costs by Blood Salvage Machines During Heart Surgery to be in the Billions 2Global Blood Resources' On-Line Calculator Reveals Wasted Blood Costs by Blood Salvage Machines During Heart Surgery to be in the Billions 3Glowing zebrafish help researchers track role of sugars in the cell 2Glowing zebrafish help researchers track role of sugars in the cell 3Vion Reports 2008 First Quarter Results 2Vion Reports 2008 First Quarter Results 3Vion Reports 2008 First Quarter Results 4
ACS Reagent Grade C 19 H 14 O 5 S Formula Weight: 354.38 PRODUCT SPECIFICATIONS Form: Rust/red crystalline powder Clarity of Solution: Passes test Visual Transition Interval: pH 6.8 - Yellow pH 8.2...
... the ultimate tool for investigating dynamic events ... previously have been limited at wavelengths longer ... not transmit in the deep UV. HORIBA ... introduces a filter-based confocal system (the DynaMic) ...
... Optically clear dishes with stacking feature for ... new product number, created to easily match Cornings ... order under the old Sigma-Aldrich number (Z70,947-6) or ... low binding surface Comp Dim: surface area 55 ...
... formulated for use in one-step QRT-PCR reactions, ... QRT-PCR mixes offer a quick and simple ... are minimised, making the protocol easy to ... QRT-PCR Mix is supplied with a patented ...
Biology Products: