Feeding strategy of early juvenile stages of the southern king crab Lithodes santolla in the San Jorge Gulf, Argentina

Stomach content analysis was performed on 313 juveniles of Lithodes santolla, with carapace lengths (CL) measuring between 8.40 and 49.04 mm. The influence of season, sex, size and moult stage on their diet were studied. Crabs were captured seasonally from the rocky sublittoral zone in the central a...

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Autores principales:	Vinuesa,Julio H, Varisco,Martín A, Balzi,Pamela
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2013
Materias:	Diet predation Lithodes santolla juvenile coastal waters omnivory
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572013000200014
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spelling	oai:scielo:S0718-195720130002000142013-11-12Feeding strategy of early juvenile stages of the southern king crab Lithodes santolla in the San Jorge Gulf, ArgentinaVinuesa,Julio HVarisco,Martín ABalzi,Pamela Diet predation Lithodes santolla juvenile coastal waters omnivory Stomach content analysis was performed on 313 juveniles of Lithodes santolla, with carapace lengths (CL) measuring between 8.40 and 49.04 mm. The influence of season, sex, size and moult stage on their diet were studied. Crabs were captured seasonally from the rocky sublittoral zone in the central area of San Jorge Gulf using SC-UBA. The frequency of prey occurrence (FO), relative abundance (RA), degree of fullness and the stomach content weight were registered. Empty stomachs were found in 14.4% of the specimens, while stomach fullness below 50% occurred in 55.0% of crabs and over 50% in 30.6% of crabs. Juveniles did not feed prior to and immediately after moult. A total of 27 prey groups were identified, which included several species of algae, protists and invertebrates. The higher FO was observed for coralline red algae (41.5%), ophiuroids (34.8%), echinoids (25.1%), isopods (21.7%), bivalves (19.5%), polychaetes (16.6%) and bryozoans (15.0%). In terms of RA, the main prey items were ophiuroids, isopods and coralline red algae. No significant differences were found in the amount of food consumed and diet composition between sexes. A seasonal variation in the prey species composition was recorded. The diet of crabs smaller than 15 mm CL differed significantly from that of larger juveniles, due to a higher abundance of bryozoans and isopods in smaller juveniles. The great diversity of prey found in juvenile king crab indicates that they are macrophages and opportunistic omnivorous predators, which take advantage of complex rocky and biogenic subtidal habitats for food and shelter.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.48 n.2 20132013-08-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572013000200014en10.4067/S0718-19572013000200014
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Diet predation Lithodes santolla juvenile coastal waters omnivory
spellingShingle	Diet predation Lithodes santolla juvenile coastal waters omnivory Vinuesa,Julio H Varisco,Martín A Balzi,Pamela Feeding strategy of early juvenile stages of the southern king crab Lithodes santolla in the San Jorge Gulf, Argentina
description	Stomach content analysis was performed on 313 juveniles of Lithodes santolla, with carapace lengths (CL) measuring between 8.40 and 49.04 mm. The influence of season, sex, size and moult stage on their diet were studied. Crabs were captured seasonally from the rocky sublittoral zone in the central area of San Jorge Gulf using SC-UBA. The frequency of prey occurrence (FO), relative abundance (RA), degree of fullness and the stomach content weight were registered. Empty stomachs were found in 14.4% of the specimens, while stomach fullness below 50% occurred in 55.0% of crabs and over 50% in 30.6% of crabs. Juveniles did not feed prior to and immediately after moult. A total of 27 prey groups were identified, which included several species of algae, protists and invertebrates. The higher FO was observed for coralline red algae (41.5%), ophiuroids (34.8%), echinoids (25.1%), isopods (21.7%), bivalves (19.5%), polychaetes (16.6%) and bryozoans (15.0%). In terms of RA, the main prey items were ophiuroids, isopods and coralline red algae. No significant differences were found in the amount of food consumed and diet composition between sexes. A seasonal variation in the prey species composition was recorded. The diet of crabs smaller than 15 mm CL differed significantly from that of larger juveniles, due to a higher abundance of bryozoans and isopods in smaller juveniles. The great diversity of prey found in juvenile king crab indicates that they are macrophages and opportunistic omnivorous predators, which take advantage of complex rocky and biogenic subtidal habitats for food and shelter.
author	Vinuesa,Julio H Varisco,Martín A Balzi,Pamela
author_facet	Vinuesa,Julio H Varisco,Martín A Balzi,Pamela
author_sort	Vinuesa,Julio H
title	Feeding strategy of early juvenile stages of the southern king crab Lithodes santolla in the San Jorge Gulf, Argentina
title_short	Feeding strategy of early juvenile stages of the southern king crab Lithodes santolla in the San Jorge Gulf, Argentina
title_full	Feeding strategy of early juvenile stages of the southern king crab Lithodes santolla in the San Jorge Gulf, Argentina
title_fullStr	Feeding strategy of early juvenile stages of the southern king crab Lithodes santolla in the San Jorge Gulf, Argentina
title_full_unstemmed	Feeding strategy of early juvenile stages of the southern king crab Lithodes santolla in the San Jorge Gulf, Argentina
title_sort	feeding strategy of early juvenile stages of the southern king crab lithodes santolla in the san jorge gulf, argentina
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2013
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572013000200014
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_version_	1714202329418301440

Feeding strategy of early juvenile stages of the southern king crab Lithodes santolla in the San Jorge Gulf, Argentina

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