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(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.)

Population biology of the gastropod Olivella minuta (Gastropoda, Olividae) on two sheltered beaches in southeastern Brazil

Texto completo
Autor(es):
Petracco, Marcelo [1] ; Camargo, Rita Monteiro [1] ; Tardelli, Daniel Teixeira [1] ; Turra, Alexander [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Oceanog, Dept Oceanog Biol, BR-05508120 Sao Paulo - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: ESTUARINE COASTAL AND SHELF SCIENCE; v. 150, n. A, SI, p. 149-156, OCT 5 2014.
Citações Web of Science: 13
Resumo

The structure, dynamics and production of two populations of the olivid gastropod Olivella minuta were analyzed through monthly sampling from November 2009 through October 2011 on two sandy beaches, Pernambuco (very sheltered) and Barequecaba (sheltered) in Sao Paulo state (23 degrees 48'S), southeastern Brazil. On both beaches, samples were taken along five transects established perpendicular to the waterline. Parameters of the von Bertalanffy growth function were estimated for both populations from monthly length-frequency distributions. The production and turnover ratios were determined using the mass-specific growth rate method. The population on the less-sheltered Barequecaba Beach was less abundant (120.02 +/- 22.60 ind m(-1)) than on Pernambuco Beach (3295.30 +/- 504.86 ind m(-1) (+/- SE)), which we attribute to the greater environmental stability of the latter. Conversely, the mean length, size of the largest individual, and body mass were higher at Barequecaba than at Pernambuco. The significant differences in the growth of individuals and the mortality rate (Z) between the beaches suggest that density-dependent processes were operating at Pernambuco Beach. The production and P/B ratio at Pernambuco (12.12 g AFDM m(-1) year(-1) and 1.91 year(-1)) were higher than at Barequecaba (0.82 g AFDM m(-1) year(-1) and 1.06 year(-1)). The difference in production can be attributed to the higher abundance on Pernambuco, while the higher P/B ratio resulted from the scarcity of smaller individuals in the intertidal zone of Barequecaba. The P/B ratio estimated for the Pernambuco population is the highest found so far for sandy-beach gastropods. This study reinforces the theory that biological interactions are important regulators of sheltered sandy-beach populations. Future studies with multi-beach sampling are needed to better understand the life-history variations of O. minuta along gradients of degree of exposure of sandy beaches. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 09/17585-6 - Ecologia populacional de Olivella minuta (Link, 1807) (Gastropoda, Olividae) na zona entremarés das praias do Araçá e de Barequeçaba, Litoral Norte do Estado de São Paulo
Beneficiário:Alexander Turra
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 10/13589-4 - Distribuição espaço-temporal de Olivella minuta (link, 1807) (Mollusca, Gastropoda, Olividae) na praia de Barequeçaba, litoral norte do Estado de São Paulo
Beneficiário:Daniel Teixeira Tardelli
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 08/11053-0 - Produção secundária da macrofauna bentônica de praias arenosas: estudo de caso com Olivella minuta (Link, 1807) (Mollusca, Gastropoda) e análise e validação metodológica
Beneficiário:Marcelo Petracco
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 10/01426-3 - Distribuição espaço-temporal de Olivella minuta (link, 1807) (Mollusca, Gastropoda, Olividae) na zona entremarés da Baía do Araçá, São Sebastião litoral norte do Estado de São Paulo
Beneficiário:Rita Monteiro Camargo
Linha de fomento: Bolsas no Brasil - Mestrado