Navigation Links
In spiders, size matters: Small males are more often meals
Date:9/10/2008

Female spiders are voracious predators and consume a wide range of prey, which sometimes includes their mates. A number of hypotheses have been proposed for why females eat males before or after mating. Researchers Shawn Wilder and Ann Rypstra from Miami University in Ohio found, in a study published in the September issue of the American Naturalist, that the answer may be simpler than previously thought. Males are more likely to be eaten if they are much smaller than females, which likely affects how easy they are to catch. In one species of spider, Hogna helluo, large males were never consumed while small males were consumed 80% of the time. This result was also confirmed when Wilder and Rypstra examined published data from a wide range of spider species. Males are more likely to be eaten in species where males are small relative to females.

Much research on sexual cannibalism has focused on a few extreme cases involving sexual selection and sperm competition. However, by looking at data on a wide range of spiders, Wilder and Rypstra discovered that the size of the male relative to the female (often referred to as sexual size dimorphism) determines how often sexual cannibalism occurs in a species. "We were surprised to find that such a simple characteristic such as how small males are relative to females has such a large effect on the frequency of sexual cannibalism," states Shawn Wilder. In many cases, sexual cannibalism may not be a complex balancing act of costs and benefits for males and females but rather a case of a hungry female eating a male when he is small enough to catch. In an interesting twist, evolution does not appear to be driving this relationship. For example, females would not become larger to consume more males because each male would then be a smaller meal to the larger female and males would not become smaller to be eaten more often because they would not get to mate as often. Rather, sexual cannibalism may be a byproduct of the evolution of large females and small males in a predatory species.


'/>"/>

Contact: Patricia Morse
pmorse@press.uchicago.edu
773-702-0446
University of Chicago Press Journals
Source:Eurekalert  

Related biology news :

1. Photos reveal Myanmars large and small predators
2. Pay attention! Small packages may lead to overeating
3. Worlds smallest snake found in Barbados
4. Small research at MSU leads to advances in energy, electronics
5. Predicting the distribution of creatures great and small
6. Crop management: How small do we go?
7. Small protein may have big role in making more bone and less fat
8. Automated microfluidic device reduces time to screen small organisms for genetic studies
9. Genome sequence of small marine creature sheds light on vertebrate origins
10. Plant biologists discover unexpected proteins affecting small RNAs
11. Window of opportunity for restoring oaks small, new study finds
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
In spiders, size matters: Small males are more often meals
(Date:5/16/2016)... --  EyeLock LLC , a market leader of iris-based ... IoT Center of Excellence in Austin, Texas ... embedded iris biometric applications. EyeLock,s iris authentication ... with unmatched biometric accuracy, making it the most proven ... platform uses video technology to deliver a fast and ...
(Date:4/28/2016)... First quarter 2016:   , ... the first quarter of 2015 The gross margin was ... 18.8) and the operating margin was 40% (-13) Earnings ... flow from operations was SEK 249.9 M (21.2) , ... SEK 7,000-8,500 M. The operating margin for 2016 is ...
(Date:4/15/2016)... , April 15, 2016 ... "Global Gait Biometrics Market 2016-2020,"  report to their ... ) , ,The global gait biometrics market ... 13.98% during the period 2016-2020. Gait ... which can be used to compute factors that ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... /PRNewswire/ - BIOREM Inc. (TSX-V: BRM) ("Biorem" or "the Company") ... shareholders, Clean Technology Fund I, LP and Clean Technology ... based venture capital funds which together hold approximately 59% ... diluted, as converted basis), that they have entered into ... holdings in Biorem to TUS Holdings Co. Ltd. ("TUS") ...
(Date:6/27/2016)... Raleigh, NC (PRWEB) , ... June 27, 2016 ... ... a mission to bring innovative medical technologies, services and solutions to the healthcare ... development and implementation of various distribution, manufacturing, sales and marketing strategies that are ...
(Date:6/24/2016)...  Regular discussions on a range of subjects including policies, ... entities said Poloz. Speaking at a lecture to ... he pointed to the country,s inflation target, which is set ... "In certain areas there needs ... economic goals, why not sit down and address strategy together?" ...
(Date:6/23/2016)... ... 2016 , ... Mosio, a leader in clinical research patient ... and Retention Tips.” Partnering with experienced clinical research professionals, Mosio revisits the hurdle ... and strategies for clinical researchers. , “The landscape of how patients receive and ...
Breaking Biology Technology: