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Patterns of resource partitioning by nesting herons and ibis: How are odonata exploited?
MedLine Citation:
PMID:  22578577     Owner:  NLM     Status:  In-Data-Review    
Herons and ibis are colonially nesting waders which, owing to their number, mobility and trophic role as top predators, play a key role in aquatic ecosystems. They are also good biological models to investigate interspecific competition between sympatric species and predation; two processes which structure ecological communities. Odonata are also numerous, diverse, mobile and can play an important role in aquatic ecosystems by serving as prey for herons and ibis. A relationship between prey size and bird predator has been observed in Numidia wetlands (NE Algeria) after analyzing food boluses regurgitated by six species of birds (Purple Heron, Black-crowned Night Heron, Glossy Ibis, Little Egret, Squacco Heron and Cattle Egret) during the breeding period, which also shows a temporal gradient for the six species. Both the Levins index and preliminary multivariate analysis of the Odonata as prey fed to nestling herons and ibis, indicated a high degree of resource overlap. However, a distinction of prey based on taxonomy (suborder and family) and developmental stage (larvae or adults) reveals a clear size dichotomy with large-sized predators (Purple Heron, Black-crowned Night Heron and Glossy Ibis) preying on large preys like Aeshnids and Libellulids and small-sized predators feeding mainly on small prey like Zygoptera. Overall, the resource utilization suggests a pattern of resource segregation by coexisting nesting herons and ibis based on the timing of reproduction, prey types, prey size and foraging microhabitats.
Farrah Samraoui; Riad Nedjah; Abdennour Boucheker; Ahmed H Alfarhan; Boudjéma Samraoui
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Publication Detail:
Type:  Journal Article     Date:  2012-04-24
Journal Detail:
Title:  Comptes rendus biologies     Volume:  335     ISSN:  1768-3238     ISO Abbreviation:  C. R. Biol.     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-05-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101140040     Medline TA:  C R Biol     Country:  France    
Other Details:
Languages:  eng     Pagination:  310-7     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Académie des sciences. Published by Elsevier SAS. All rights reserved.
Laboratoire de recherche et de conservation des zones humides, University of Guelma, Guelma, Algeria.
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