Agonistic interactions and their implications for parasitoid species coexistence
When 2 species exploit the same limiting resource, interspecific competition may lead to the exclusion of one of them. For the 2 species to coexist, resource exploitation strategies exhibited by both species must somehow counterbalance each other. Eupelmus vuilleti and Dinarmus basalis are 2 solitary parasitoid species exploiting the same hosts (larvae and pupae of Callosobruchus maculatus) in sub-Saharan Africa. They display different strategies when in indirect (exploitative) competition situations: D. basalis females tend to avoid multiparasitism, whereas E. vuilleti females tend to accept parasitized hosts. Therefore, E. vuilleti seems dominant and potentially able to exclude D. basalis. Thus, how can D. basalis persists when in sympatry with E. vuilleti? Here, we studied the strategies adopted by females of either species when in direct (interference) competition. We investigated the effect of certain factors affecting females' competitive abilities or the value that they place on the resource such as female size, female physiological state (egg load), the quality of the habitat previously encountered by females (rich or poor in hosts), and the ownership status. This study revealed that D. basalis females tended to outcompete E. vuilleti females when competing for a given host. They were more aggressive and won most contests, whereas E. vuilleti females only won contests when being an owner with a high egg load or when having experienced high host availability. Thus, both species seem to show counterbalancing strategies when in exploitative and interference competition, which could promote their coexistence in nature. Copyright 2011, Oxford University Press.
If you experience problems downloading a file, check if you have the proper application to view it first. In case of further problems read the IDEAS help page. Note that these files are not on the IDEAS site. Please be patient as the files may be large.
As the access to this document is restricted, you may want to look for a different version under "Related research" (further below) or search for a different version of it.
Volume (Year): 22 (2011)
Issue (Month): 5 ()
|Contact details of provider:|| Postal: Oxford University Press, Great Clarendon Street, Oxford OX2 6DP, UK|
Fax: 01865 267 985
Web page: http://beheco.oxfordjournals.org/
|Order Information:||Web: http://www.oup.co.uk/journals|
When requesting a correction, please mention this item's handle: RePEc:oup:beheco:v:22:y:2011:i:5:p:1114-1122. See general information about how to correct material in RePEc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Oxford University Press)or (Christopher F. Baum)
If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.
If references are entirely missing, you can add them using this form.
If the full references list an item that is present in RePEc, but the system did not link to it, you can help with this form.
If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your profile, as there may be some citations waiting for confirmation.
Please note that corrections may take a couple of weeks to filter through the various RePEc services.