Similar feeding habits of two morphs of Munida gregaria (Decapoda) evidence the lack of trophic polymorphism

Munida gregaria and M. subrugosa were originally described as two different species on the basis of several morphological characters, but recent studies evidenced that both former species constitute the same biological species, so hereafter they are referred to as two morphs of M. gregaria: `gregari...

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Autores principales:	Pérez-Barros,Patricia, Romero,M. Carolina, Calcagno,Javier A, Lovrich,Gustavo A
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2010
Materias:	crabs squat lobster speciation SW Atlantic
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572010000300011
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spelling	oai:scielo:S0718-195720100003000112011-02-03Similar feeding habits of two morphs of Munida gregaria (Decapoda) evidence the lack of trophic polymorphismPérez-Barros,PatriciaRomero,M. CarolinaCalcagno,Javier ALovrich,Gustavo A crabs squat lobster speciation SW Atlantic Munida gregaria and M. subrugosa were originally described as two different species on the basis of several morphological characters, but recent studies evidenced that both former species constitute the same biological species, so hereafter they are referred to as two morphs of M. gregaria: `gregaria' and `subrugosa'. Notwithstanding their synonimization, the occurrence of two sympatric morphs represents an interesting case for the study of the processes involved in the maintenance of these two morphotypes in nature. We hypothesized that the distinct shapes of mouthparts of both morphs may be related to different feeding habits. Adults of M. gregaria, morphs `gregaria' and `subrugosa', were collected in the Beagle Channel by epibenthic trawling during November 2004. The trophic niche of both morphs highly overlapped. Both occupied the same trophic position in the food web of the Beagle Channel, showing the same feeding habits. As predators they fed mainly on crustaceans and algae, and as deposit feeders they ingested particulate organic matter and organisms associated with the superficial layer of the sediment. However, the relative abundance of crustaceans was higher in stomachs of `subrugosa' than in those of `gregaria', a higher proportion of stomachs of `gregaria' contained more algae than in `subrugosa', and a greater frequency of occurrence of unicellular preys was found in the diet of `gregaria'. Despite these differences, this study provided no evidences to support the existence of a trophic polymorphism between morphs of M. gregaria, at least based on the feeding habit of adults.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.45 n.3 20102010-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572010000300011en10.4067/S0718-19572010000300011
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	crabs squat lobster speciation SW Atlantic
spellingShingle	crabs squat lobster speciation SW Atlantic Pérez-Barros,Patricia Romero,M. Carolina Calcagno,Javier A Lovrich,Gustavo A Similar feeding habits of two morphs of Munida gregaria (Decapoda) evidence the lack of trophic polymorphism
description	Munida gregaria and M. subrugosa were originally described as two different species on the basis of several morphological characters, but recent studies evidenced that both former species constitute the same biological species, so hereafter they are referred to as two morphs of M. gregaria: `gregaria' and `subrugosa'. Notwithstanding their synonimization, the occurrence of two sympatric morphs represents an interesting case for the study of the processes involved in the maintenance of these two morphotypes in nature. We hypothesized that the distinct shapes of mouthparts of both morphs may be related to different feeding habits. Adults of M. gregaria, morphs `gregaria' and `subrugosa', were collected in the Beagle Channel by epibenthic trawling during November 2004. The trophic niche of both morphs highly overlapped. Both occupied the same trophic position in the food web of the Beagle Channel, showing the same feeding habits. As predators they fed mainly on crustaceans and algae, and as deposit feeders they ingested particulate organic matter and organisms associated with the superficial layer of the sediment. However, the relative abundance of crustaceans was higher in stomachs of `subrugosa' than in those of `gregaria', a higher proportion of stomachs of `gregaria' contained more algae than in `subrugosa', and a greater frequency of occurrence of unicellular preys was found in the diet of `gregaria'. Despite these differences, this study provided no evidences to support the existence of a trophic polymorphism between morphs of M. gregaria, at least based on the feeding habit of adults.
author	Pérez-Barros,Patricia Romero,M. Carolina Calcagno,Javier A Lovrich,Gustavo A
author_facet	Pérez-Barros,Patricia Romero,M. Carolina Calcagno,Javier A Lovrich,Gustavo A
author_sort	Pérez-Barros,Patricia
title	Similar feeding habits of two morphs of Munida gregaria (Decapoda) evidence the lack of trophic polymorphism
title_short	Similar feeding habits of two morphs of Munida gregaria (Decapoda) evidence the lack of trophic polymorphism
title_full	Similar feeding habits of two morphs of Munida gregaria (Decapoda) evidence the lack of trophic polymorphism
title_fullStr	Similar feeding habits of two morphs of Munida gregaria (Decapoda) evidence the lack of trophic polymorphism
title_full_unstemmed	Similar feeding habits of two morphs of Munida gregaria (Decapoda) evidence the lack of trophic polymorphism
title_sort	similar feeding habits of two morphs of munida gregaria (decapoda) evidence the lack of trophic polymorphism
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2010
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572010000300011
work_keys_str_mv	AT perezbarrospatricia similarfeedinghabitsoftwomorphsofmunidagregariadecapodaevidencethelackoftrophicpolymorphism AT romeromcarolina similarfeedinghabitsoftwomorphsofmunidagregariadecapodaevidencethelackoftrophicpolymorphism AT calcagnojaviera similarfeedinghabitsoftwomorphsofmunidagregariadecapodaevidencethelackoftrophicpolymorphism AT lovrichgustavoa similarfeedinghabitsoftwomorphsofmunidagregariadecapodaevidencethelackoftrophicpolymorphism
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Similar feeding habits of two morphs of Munida gregaria (Decapoda) evidence the lack of trophic polymorphism

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