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Diet of the amphi-Atlantic scaphopod Fissidentalium candidum in the deep waters of Campos Basin, south-eastern Brazil

Published online by Cambridge University Press:  21 April 2016

Renato Junqueira De Souza Dantas Open the ORCID record for Renato Junqueira De Souza Dantas [Opens in a new window] ,
Lazaro Luiz Mattos Laut  and
Carlos Henrique Soares Caetano
Renato Junqueira De Souza Dantas*
Affiliation:
Departamento de Oceanografia e Limnologia, Laboratório de Bentos e Cefalópodes – Via Costeira Senador Dinarte Medeiros Mariz s/n, Universidade Federal do Rio Grande do Norte, Mãe Luiza, Natal, RN 59014-002, Brasil
Lazaro Luiz Mattos Laut
Affiliation:
Laboratório de Micropaleontologia – Av. Pasteur, Universidade Federal do Estado do Rio de Janeiro, Instituto de Biociências, 458, sala 500, Urca, Rio de Janeiro, RJ 22290-240, Brasil
Carlos Henrique Soares Caetano
Affiliation:
Laboratório de Zoologia de Invertebrados Marinhos – Av. Pasteur, Universidade Federal do Estado do Rio de Janeiro, Instituto de Biociências, 458, sala 309, Urca, Rio de Janeiro, RJ 22290-240, Brasil
*
Correspondence should be addressed to:R.J.S. Dantas, Departamento de Oceanografia e Limnologia, Laboratório de Bentos e Cefalópodes – Via Costeira Senador Dinarte Medeiros Mariz s/n, Universidade Federal do Rio Grande do Norte, Mãe Luiza, Natal, RN 59014-002, Brasil email: [email protected]
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Abstract

Specimens of Fissidentalium candidum collected at Campos Basin, south-eastern Brazil, had their diet investigated in order to assess its feeding habits. Benthic prey exceeded the planktonic ones as expected and Foraminifera constituted the most frequent prey taxa, comprising about 99.5% of the scaphopod diet; the remaining components included a few molluscs (gastropods, bivalves and scaphopods), a nematode, an ostracod crustacean, fish otoliths, unknown partial organisms and inorganic material (e.g. sediment grains and polymetallic nodules). Amongst the species previously studied, F. candidum stood out by presenting the highest dietary diversity (H = 3.35) and species richness (N = 118). Predator and prey dimensions were not correlated and no spatial variation was observed in the diet amongst the three collection sites in the mid-slope of Campos Basin. Generalism, high rate of rare or unimportant species and high contribution of within-phenotype component to the niche width were important features of the trophic ecology of F. candidum. Inhabiting the deep water of Campos Basin, this dentaliid obtained most of its energy from the benthic microfauna, being a specialized foram predator with moderate preference for, and moderate selection against, several species.

Keywords

Dentaliidaefeeding ecologyinfaunal predatormollusc
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 97 , Issue 6 , September 2017 , pp. 1259 - 1266
Copyright
Copyright © Marine Biological Association of the United Kingdom 2016 

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