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Journal Molluscan Studies Advance Access originally published online on March 27, 2008
Journal of Molluscan Studies 2008 74(2):191-197; doi:10.1093/mollus/eyn006
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© The Author 2008. Published by Oxford University Press on behalf of The Malacological Society of London, all rights reserved

Population characteristics and planktonic larval stage of the New Zealand screwshell Maoricolpus roseus

T. A. Probst and C. M. Crawford

Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Marine Research Laboratories, Nubeena Crescent, Taroona, Tas 7053, Australia

Correspondence: T.A. Probst; e-mail: tobias.probst{at}utas.edu.au


  Abstract

Maoricolpus roseus is believed to have been introduced into Tasmania in the 1920s. Despite its wide distribution, dense populations and being considered successful in colonizing and altering several habitats, details of its reproduction and life cycle are not known. Specimens collected from the D'Entrecasteaux Channel (SE Tasmania) over 2 years showed sexual dimorphism with females relatively larger than males. A 1:1 sex ratio was observed and females were found carrying encapsulated larvae throughout consecutive austral summer seasons (September or October till February), with up to 70% of females carrying larvae. Larvae released from egg capsules were planktonic, all relatively well developed, and fed on microalgae, indicating that the species has planktotrophic development, and suggesting high potential for dispersal. This information is important for the development of management strategies to control this invasive species.

(Received 20 May 2007; accepted 10 February 2008)


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