Document Detail

The effect of body size on prey choice by Rivulus luelingi Seegers 1984 (Aplocheiloidei: Rivulidae).
MedLine Citation:
PMID:  9440355     Owner:  NLM     Status:  MEDLINE    
The effect of body size of Rivulus luelingi (10-15, 20-25, 30-35, 40-45, 46-50 mm length classes) on predation of three size class combinations of Culex sp larvae (small-medium, small-large, medium-large) was studied in the laboratory by means of analyses of preference, specific overlap, and actual number of prey eaten. The smallest experimental R. luelingi size class (10-15 mm) was gape limited. Experimental diets were affected by prey choice and morphological constraint. Preference for the smaller prey, in each prey type combination, was negatively correlated with predator body size, and the converse was true for the larger prey. Preference for any prey size depended on the available prey distribution. There was a correlation between the number of each prey size eaten and predator size in each prey size combination, except for the small prey in the small-medium combination. Specific overlap analysis revealed asymmetries in diet overlap. Feeding success increased non-linearly with R. luelingi body length for two prey size distributions; longer individuals had a disproportionally high feeding success. Preference analysis was more accurate than either specific overlap or actual number of prey eaten. The three kinds of analysis resulted in blocks of contiguous size classes with similar resource utilization, which were considered to have a high chance of interacting competitively.
P de S Santos Filho
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Revista brasileira de biologia     Volume:  57     ISSN:  0034-7108     ISO Abbreviation:  Rev Bras Biol     Publication Date:  1997 Nov 
Date Detail:
Created Date:  1998-02-24     Completed Date:  1998-02-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985055R     Medline TA:  Rev Bras Biol     Country:  BRAZIL    
Other Details:
Languages:  eng     Pagination:  551-62     Citation Subset:  IM    
Departamento de Ecologia Geral, Universidade de São Paulo, Brazil.
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MeSH Terms
Body Constitution*
Culex / anatomy & histology
Feeding Behavior
Fishes / anatomy & histology*
Larva / anatomy & histology
Predatory Behavior*
Regression Analysis

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

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