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: 'gr...

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Autores principales: Pérez-Barros, P., Romero, M.C., Calcagno, J.A., Lovrich, G.A.
Formato: JOUR
Materias:
Crabs
Speciation
Squat lobster
SW Atlantic
algae
Crustacea
Decapoda (Crustacea)
Galatheidae
Munida gregaria
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_07173326_v45_n3_p461_PerezBarros
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_07173326_v45_n3_p461_PerezBarros
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spelling todo:paper_07173326_v45_n3_p461_PerezBarros2023-10-03T15:36:21Z Similar feeding habits of two morphs of Munida gregaria (Decapoda) evidence the lack of trophic polymorphism Pérez-Barros, P. Romero, M.C. Calcagno, J.A. Lovrich, G.A. Crabs Speciation Squat lobster SW Atlantic algae Crustacea Decapoda (Crustacea) Galatheidae Munida gregaria 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_07173326_v45_n3_p461_PerezBarros
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Crabs
Speciation
Squat lobster
SW Atlantic
algae
Crustacea
Decapoda (Crustacea)
Galatheidae
Munida gregaria
spellingShingle Crabs
Speciation
Squat lobster
SW Atlantic
algae
Crustacea
Decapoda (Crustacea)
Galatheidae
Munida gregaria
Pérez-Barros, P.
Romero, M.C.
Calcagno, J.A.
Lovrich, G.A.
Similar feeding habits of two morphs of Munida gregaria (Decapoda) evidence the lack of trophic polymorphism
topic_facet Crabs
Speciation
Squat lobster
SW Atlantic
algae
Crustacea
Decapoda (Crustacea)
Galatheidae
Munida gregaria
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.
format JOUR
author Pérez-Barros, P.
Romero, M.C.
Calcagno, J.A.
Lovrich, G.A.
author_facet Pérez-Barros, P.
Romero, M.C.
Calcagno, J.A.
Lovrich, G.A.
author_sort Pérez-Barros, P.
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
url http://hdl.handle.net/20.500.12110/paper_07173326_v45_n3_p461_PerezBarros
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