Mandible characteristics and allometric relations in copepods: a reliable method to estimate prey size and composition from mandible occurrence in predator guts

The size and shape of the cutting edge of the mandibles from the five most abundant copepod species found in Mejillones Bay are described with the aim to create a helpful tool for the identification of copepod prey and their size from predator gut contents. Good allometric relationships were found b...

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Autores principales:	Giesecke,Ricardo, González,Humberto E.
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2004
Materias:	copepod mandibles feeding habits in copepods gut content analysis Humboldt Current System
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000400004
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spelling	oai:scielo:S0716-078X20040004000042005-04-22Mandible characteristics and allometric relations in copepods: a reliable method to estimate prey size and composition from mandible occurrence in predator gutsGiesecke,RicardoGonzález,Humberto E. copepod mandibles feeding habits in copepods gut content analysis Humboldt Current System The size and shape of the cutting edge of the mandibles from the five most abundant copepod species found in Mejillones Bay are described with the aim to create a helpful tool for the identification of copepod prey and their size from predator gut contents. Good allometric relationships were found between the carapace length and the mandible width for the species Paracalanus parvus, Centropages brachiatus and Acartia tonsa. By contrast, the cyclopoids Oithona sp. and Corycaeus sp. did not present a good relationship between these two parameters, presumably due to the presence of more than a species in the study area. Applying the edge index (<A HREF="#itoh70">Itoh 1970</A>) the copepods were classified as herbivores (e.g., P. parvus), omnivores (e.g., C. brachiatus and A. tonsa), and carnivores (e.g., Oithona sp.). In general, there was a tight relationship between the morphometric characters of the mandible blade and the trophic ecology of each species. The good relationship between the mandible width and the carapace length of the calanoid species will permit the estimation of the size of an ingested copepod by a predator, within a certain degree of accuracy, by measuring the width of the mandibles found in gut contents. This relationship and the supplementary characterization of the mandible blade will help improve the knowledge of the feeding ecology of the mesozooplankton in northern Chileinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.77 n.4 20042004-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000400004en10.4067/S0716-078X2004000400004
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	copepod mandibles feeding habits in copepods gut content analysis Humboldt Current System
spellingShingle	copepod mandibles feeding habits in copepods gut content analysis Humboldt Current System Giesecke,Ricardo González,Humberto E. Mandible characteristics and allometric relations in copepods: a reliable method to estimate prey size and composition from mandible occurrence in predator guts
description	The size and shape of the cutting edge of the mandibles from the five most abundant copepod species found in Mejillones Bay are described with the aim to create a helpful tool for the identification of copepod prey and their size from predator gut contents. Good allometric relationships were found between the carapace length and the mandible width for the species Paracalanus parvus, Centropages brachiatus and Acartia tonsa. By contrast, the cyclopoids Oithona sp. and Corycaeus sp. did not present a good relationship between these two parameters, presumably due to the presence of more than a species in the study area. Applying the edge index (<A HREF="#itoh70">Itoh 1970</A>) the copepods were classified as herbivores (e.g., P. parvus), omnivores (e.g., C. brachiatus and A. tonsa), and carnivores (e.g., Oithona sp.). In general, there was a tight relationship between the morphometric characters of the mandible blade and the trophic ecology of each species. The good relationship between the mandible width and the carapace length of the calanoid species will permit the estimation of the size of an ingested copepod by a predator, within a certain degree of accuracy, by measuring the width of the mandibles found in gut contents. This relationship and the supplementary characterization of the mandible blade will help improve the knowledge of the feeding ecology of the mesozooplankton in northern Chile
author	Giesecke,Ricardo González,Humberto E.
author_facet	Giesecke,Ricardo González,Humberto E.
author_sort	Giesecke,Ricardo
title	Mandible characteristics and allometric relations in copepods: a reliable method to estimate prey size and composition from mandible occurrence in predator guts
title_short	Mandible characteristics and allometric relations in copepods: a reliable method to estimate prey size and composition from mandible occurrence in predator guts
title_full	Mandible characteristics and allometric relations in copepods: a reliable method to estimate prey size and composition from mandible occurrence in predator guts
title_fullStr	Mandible characteristics and allometric relations in copepods: a reliable method to estimate prey size and composition from mandible occurrence in predator guts
title_full_unstemmed	Mandible characteristics and allometric relations in copepods: a reliable method to estimate prey size and composition from mandible occurrence in predator guts
title_sort	mandible characteristics and allometric relations in copepods: a reliable method to estimate prey size and composition from mandible occurrence in predator guts
publisher	Sociedad de Biología de Chile
publishDate	2004
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000400004
work_keys_str_mv	AT gieseckericardo mandiblecharacteristicsandallometricrelationsincopepodsareliablemethodtoestimatepreysizeandcompositionfrommandibleoccurrenceinpredatorguts AT gonzalezhumbertoe mandiblecharacteristicsandallometricrelationsincopepodsareliablemethodtoestimatepreysizeandcompositionfrommandibleoccurrenceinpredatorguts
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Mandible characteristics and allometric relations in copepods: a reliable method to estimate prey size and composition from mandible occurrence in predator guts

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