DSpace About DSpace Software
 

Repositorio Atenea de la Facultad de Ciencias, UNAM >
Repositorio Ciencias >
FACULTAD DE CIENCIAS >
Ciencias >

Please use this identifier to cite or link to this item: http://hdl.handle.net/11154/3093

Title: FEEDING-HABITS AND FOOD NICHE SEGREGATION OF CALLINECTES-SAPIDUS, C-RATHBUNAE, AND C-SIMILIS IN A SUBTROPICAL COASTAL LAGOON OF THE GULF-OF-MEXICO
Authors: ROSAS, C
LAZAROCHAVEZ, E
BUCKLERamirez, F
Issue Date: 1994
Abstract: The aim of this study is to evaluate the variations in trophic relationships among species of blue crabs, which may lead to a better understanding of the mechanisms that enable closely related species to exploit the same trophic niche. Callinectes sapidus, C. rathbunae, and C. similis from Tamiahua Lagoon, Mexico, were used in the present study to investigate this question. A total of 4,038 crab-gut contents were analyzed. Of these 1,350 belonged to C sapidus, 1,128 to C rathbunae, and 1,560 to C similis. Six groups of food items were identified: plant fragments (Halodule spp.), micromolluscs (Mulinia lateralis and Macoma atenta, crustaceans (Penaeus spp. and Callinectes spp.), animal residues, and sand and mud. A seasonal variation in prey composition was observed, as well as differences among ages of the three species. In general, as the size class increased, plant matter, sediment, and animal residues decreased, and micromolluscs and crustaceans increased. A clear overlap was detected for C sapidus-C. rathbunae of their trophic niches, with a maximum overlap in winter when both species ate practically the same type of food. The same pattern was observed also for C sapidus-C. similis. Callinectes similis-C rathbunae show overlap in spring and winter, when ovigerous females are on their breeding grounds. Ontogenetic changes in the diet and niche overlap in relation to seasonal changes in reproductive behavior allow the three species to utilize the same resources at Tamiahua Lagoon, Mexico.
URI: http://hdl.handle.net/11154/3093
ISSN: 0278-0372
Appears in Collections:Ciencias

Files in This Item:

There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback