Cookies Policy
X

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here

Sexual Dimorphism of Head Size in Podarcis Hispanica Atrata: Testing the Dietary Divergence Hypothesis By Bite Force Analysis

No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.

Brill’s MyBook program is exclusively available on BrillOnline Books and Journals. Students and scholars affiliated with an institution that has purchased a Brill E-Book on the BrillOnline platform automatically have access to the MyBook option for the title(s) acquired by the Library. Brill MyBook is a print-on-demand paperback copy which is sold at a favorably uniform low price.

Access this article

+ Tax (if applicable)
Add to Favorites
You must be logged in to use this functionality

image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

Sexual dimorphism of relative head size is a widespread phenomenon in lizards, males having larger head/trunk ratios than females. In an attempt to explain this sexual dimorphism several hypotheses have been formulated. The two most frequently cited ones are: 1) sexual selection acting on those structures important in intrasexual competition and 2) natural selection for reduction of food competition between the sexes. In the insular subspecies of Podarcis hispanica (P h. atrata) males tend to have significantly larger heads than similarly sized females. We here test an implicit assumption of the dietary divergence hypothesis, namely that an increase in head size results in an increase in gape width and/or bite force, thereby allowing the larger headed sex to exploit larger prey classes. Using a static bite force model, we calculated the magnitude of bite forces for given directions at given positions on the jaws and for different head sizes. We experimentally determined the hardness of three different prey items and compared the data to the maximal bite force produced by both sexes. Our results suggest an important difference in male and female bite capacity, which may bear significant ecological relevance, and are in agreement with the implicit assumption of the dietary divergence theory.

Affiliations: 1: Department of Biology, University of Antwerp (UIA), Universiteitsplein 1, B-2670 Antwerp, Belgium

10.1163/156854295X00203
/content/journals/10.1163/156854295x00203
dcterms_title,pub_keyword,dcterms_description,pub_author
6
3
Loading
Loading

Full text loading...

/content/journals/10.1163/156854295x00203
Loading

Data & Media loading...

http://brill.metastore.ingenta.com/content/journals/10.1163/156854295x00203
Loading

Article metrics loading...

/content/journals/10.1163/156854295x00203
1995-01-01
2016-12-11

Sign-in

Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Subscribe to ToC alert
  • Get permissions
  • Recommend to your library

    You must fill out fields marked with: *

    Librarian details
    Your details
    Why are you recommending this title?
    Select reason:
     
    Netherlands Journal of Zoology — Recommend this title to your library
  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation