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Locomotion of Stramonita haemastoma (Linnaeus) (Gastropoda, Muricidae) on a mixed shore of rocks and sand

Abstract

Mixed shores of rocks and sand are appropriate systems for the study of limitations that the isolation of rocks may impose for gastropods that typically inhabit rocky shores. We marked 52 Stramonita haemastoma (Linnaeus, 1767) snails on a mixed shore and found that 34 of them moved between rocks one to four times during 15 surveys in a period of 72 days. In the experiments, the snails moved on rock by continuous, direct, ditaxic, alternate undulations of the foot sole but on submerged sand they used slower arrhythmic discontinuous contractions of the foot sole. They switched between modes of locomotion in response to the type and topography of the substrate and possibly to water dynamics. In nature, snails moved between rocks forming aggregations where they oviposited. This may have masked other causes of movement, such as availability of prey. Most snails burrowed into the sand when the rocks became exposed during low tides. Further experiments are needed to explicitly address the possible causes of movements among rocks and burial.

Gastropoda; Muricidae; Stramonita; Thais; desiccation; locomotion; mixed shore; oyster drill; Brazil


Locomotion of Stramonita haemastoma (Linnaeus) (Gastropoda, Muricidae) on a mixed shore of rocks and sand

Marcos G. Papp; Luiz F.L. Duarte

Departamento de Zoologia, Instituto de Biologia, Universidade Estadual de Campinas. 13083-970 Campinas, São Paulo, Brasil

ABSTRACT

Mixed shores of rocks and sand are appropriate systems for the study of limitations that the isolation of rocks may impose for gastropods that typically inhabit rocky shores. We marked 52 Stramonita haemastoma (Linnaeus, 1767) snails on a mixed shore and found that 34 of them moved between rocks one to four times during 15 surveys in a period of 72 days. In the experiments, the snails moved on rock by continuous, direct, ditaxic, alternate undulations of the foot sole but on submerged sand they used slower arrhythmic discontinuous contractions of the foot sole. They switched between modes of locomotion in response to the type and topography of the substrate and possibly to water dynamics. In nature, snails moved between rocks forming aggregations where they oviposited. This may have masked other causes of movement, such as availability of prey. Most snails burrowed into the sand when the rocks became exposed during low tides. Further experiments are needed to explicitly address the possible causes of movements among rocks and burial.

Key words: Gastropoda, Muricidae, Stramonita, Thais, desiccation, locomotion, mixed shore, oyster drill, Brazil

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ACKNOWLEDGEMENTS. We are grateful to C.A. de Magalhães tor suggestions and to C.O.G. Papp, G.G. Rosenthal, M.J. Ryan, M. Tanaka and two anonymous reviewers for comments on the manuscript, and to the Centro de Biologia Marinha da USP (CEBIMar) for logistic support.

Recebido em 28.X.1999; aceito em 05.IV.2001

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Publication Dates

  • Publication in this collection
    30 Apr 2009
  • Date of issue
    Mar 2001

History

  • Accepted
    05 Apr 2001
  • Received
    28 Oct 1999
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