Document Detail

Foraging behaviors of two sympatric ant species in response to lizard eggs.
MedLine Citation:
PMID:  20199855     Owner:  NLM     Status:  MEDLINE    
The trade-off between behavioral dominance and resource discovery ability represents a mechanism which could facilitate the coexistence of species, but evidence of the existence of this trade-off is limited and is often derived from experiments using artificial bait. In this study, I performed a field experiment to investigate the outcome of potential food competition between an encounter species (Paratrechina longicornis) and an exploitative one (Pheidole taivanensis) and to examine the factors that may explain the behavior of P. taivanensis when obtaining food (lizard eggs) without being attacked by P. longicornis. When P. longicornis was experimentally introduced to eggs occupied by P. taivanensis for 1 day, it displaced P. taivanensis. However, P. longicornis ignored lizard eggs which had been occupied by P. taivanensis for 2 or more days, and did not displace P. taivanensis, because by that time the eggshells had been damaged by P. taivanensis so they could no longer be used by P. longicornis. Eggshells were damaged more quickly by P. taivanensis at Santimen, southwestern Taiwan, than at four other study sites where there were lower intensities of food competition between P. taivanensis and P. longicornis. The displacement percentage was higher at Santimen which had higher ant population densities. The present study shows that lizard eggs may constitute a natural, ephemeral resource for which ants compete in space and time. Comparisons between study sites with and without ants suggest the existence of a trade-off between resource discovery and territorial defense.
Wen-San Huang
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-03-02
Journal Detail:
Title:  Zoology (Jena, Germany)     Volume:  113     ISSN:  1873-2720     ISO Abbreviation:  Zoology (Jena)     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-04-12     Completed Date:  2010-07-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9435608     Medline TA:  Zoology (Jena)     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  85-90     Citation Subset:  IM    
Department of Zoology, National Museum of Natural Science, 1 Kuan Chien Rd., Taichung, 404, Taiwan. <>
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MeSH Terms
Appetitive Behavior*
Competitive Behavior*
Feeding Behavior*
Lizards / physiology
Ovum / physiology
Species Specificity

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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