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Spatial and size feeding niche partitioning of the rhomboid mojarra Diapterus rhombeus (Cuvier, 1829) in a tropical Brazilian Bay Pessanha, A.L.M.; Araújo, F.G. (2012). Spatial and size feeding niche partitioning of the rhomboid mojarra Diapterus rhombeus (Cuvier, 1829) in a tropical Brazilian Bay. Mar. Biol. Res. 8(3): 273-283. http://dx.doi.org/10.1080/17451000.2011.615326 In: Marine Biology Research. Taylor & Francis: Oslo; Basingstoke. ISSN 1745-1000; e-ISSN 1745-1019

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Beschikbaar in	Auteurs
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Trefwoorden

ASW, Brazil, Rio de Janeiro, Sepetiba Bay Availability > Food availability Behaviour > Feeding behaviour Fisheries > Demersal fisheries Interspecific relationships > Predation > Prey selection Resources > Natural resources > Food resources Water bodies > Coastal waters > Coastal landforms > Coastal inlets > Bays Diapterus rhombeus (Cuvier, 1829) [WoRMS] Sepetiba, Baía de [Marine Regions] Marien/Kust

Author keywords

Tropical bays; demersal fishes; feeding habits; mojarras; partitioningresources

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Auteurs		Top
Pessanha, A.L.M. Araújo, F.G.

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Abstract

We examined the stomach contents of 287 individuals of rhomboid mojarra Diapterus rhombeus collected between June 1999 and May 2000 in three zones (inner, middle and outer) of a Brazilian tropical bay. Fish were grouped in five size-class (Total Length1 = 80 mm; TL2=81–110; TL3=111–140; TL4=141–170; and TL5 = 171). The aim was to assess whether intraspecific spatial and size-feeding niche partitioning occurs and to describe the strategy used to explore the available resources. Crustacea and Polychaeta were the most important trophic categories and Harpacticoida (Index of Relative Importance, IRI = 66.9%) was the most preferred prey throughout all zones and size classes. The smallest individuals (TL=140 mm) occurred exclusively in the inner zone and fed mainly on Harpacticoida, Calanoida, sedentary Polychaeta and Nematoda, while the largest individuals (TL>140 mm) fed mainly on Harpaticoida and Ostracoda. In the outer zone, the largest individuals feed mainly on Harpacticoida and Caprella. A high within-phenotype contribution to the niche width and a generalist zoobenthivore feeding strategy were detected. Partitioning the food items along space and growth seems to be the mechanism used by this species to decrease intraspecific competition.

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