Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Multi-species generalist predation on the stochastic harvested clam Tivela mactroides (Mollusca, Bivalvia)

Texto completo
Autor(es):
Turra, Alexander [1] ; Fernandez, Wellington S. [1] ; Bessa, Eduardo [2] ; Santos, Flavia B. [3] ; Denadai, Marcia R. [4, 2]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Oceanog, Dept Oceanog Biol, BR-05508120 Sao Paulo, SP - Brazil
[2] Univ Estado Mato Grosso, Inst Ciencia Nat & Terra, BR-78300000 Tangara Da Serra, MT - Brazil
[3] Univ Estadual Sudoeste Bahia, Dept Ciencias Nat, BR-45083900 Vitoria Da Conquista, BA - Brazil
[4] Ctr Univ Fundacao Ensino Octavio Bastos, BR-13870431 Sao Joao Da Boa Vista, SP - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: ESTUARINE COASTAL AND SHELF SCIENCE; v. 166, n. A, SI, p. 115-123, DEC 5 2015.
Citações Web of Science: 8
Resumo

Top-down control is an important force modulating the abundance of prey and structuring marine communities. The harvested trigonal clam Tivela mactroides is hypothesized to be part of the diet of a variety of marine organisms, with its stock influencing predator abundance and being influenced by them. Here we analyzed the diet of potential predators of T. mactroides in Caraguatatuba Bay, northern coast of Sao Paulo State, Brazil, to identify the main consumers of this marine resource, and also to address the importance of this clam in the diet of each predator. Samples were taken year-round by trawls; all specimens collected were identified and measured and the food items identified and quantified. Twenty-one species consumed T mactroides, whose importance in the diet varied greatly in both the volume ingested and the frequency of occurrence (pompano Trachinotus carolinus > blue crab Callinectes danae > starfish Astropecten marginatus). Top-down influence on T. mactroides was also dependent on the abundance of consumers (yellow catfish Cathorops spixii > rake stardrum Stellifer rastrifer > barred grunt Conodon nobilis > A. marginatus). Considering the mean volume ingested, the frequency of occurrence of T mactroides in the diet, and the relative abundance of consumers, the predators that most influenced T. mactroides were T. carolinus, A. marginatus, and C. danae, in decreasing order. Large numbers of small-sized individuals of T. mactroides (<10 mm) were generally preyed upon by A. marginatus, which may have a stronger effect on clam abundance in comparison to C. danae and T. carolinus, which preyed upon larger clams. In conclusion, the results of this study indicate that predators' consumption of T. mactroides in Caraguatatuba Bay can influence its stocks, mainly due to the type and/or abundance of predator species, the volume and number of individuals of T. mactroides preyed upon, and the temporal variations in the abundance of predators. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 06/57575-1 - Avaliação do impacto da predação e de eventos de mortalidade em massa no estoque do berbigão Tivela mactroides (Born, 1778) (Mollusca, Veneridae) na Enseada de Caraguatatuba
Beneficiário:Márcia Regina Denadai
Linha de fomento: Bolsas no Brasil - Apoio a Jovens Pesquisadores