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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Petracco, Marcelo [1] ; Camargo, Rita Monteiro [1] ; Tardelli, Daniel Teixeira [1] ; Turra, Alexander [1]
Total Authors: 4
[1] Univ Sao Paulo, Inst Oceanog, Dept Oceanog Biol, BR-05508120 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: ESTUARINE COASTAL AND SHELF SCIENCE; v. 150, n. A, SI, p. 149-156, OCT 5 2014.
Web of Science Citations: 11

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)

FAPESP's process: 10/01426-3 - Spatio-temporal distribution of Olivella minuta (Link, 1807)(Mollusca, Gastropoda, Olividae) in the intertidal zone of Araçá Bay, São Sebastião, northern coast of São Paulo State
Grantee:Rita Monteiro Camargo
Support type: Scholarships in Brazil - Master
FAPESP's process: 09/17585-6 - Population ecology of Olivella minuta (Link, 1807) (Gastropoda, Olividae) in the intertidal of Araçá and Barequeçaba beaches, northern coast of São Paulo State
Grantee:Alexander Turra
Support type: Regular Research Grants
FAPESP's process: 08/11053-0 - Secondary production of benthonic macrofauna in sandy beaches: a case study with Olivella minuta (Link, 1807) (Mollusca, Gastropoda) and methodological analysis and validation
Grantee:Marcelo Petracco
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 10/13589-4 - Spatial and seasonal distribution of Olivella minuta (LINK,1807)(Mollusca, Gastropoda, Olividae) at Baraqueçaba Beach,São Paulo-SP
Grantee:Daniel Teixeira Tardelli
Support type: Scholarships in Brazil - Master