Molluscan ResearchISSN 1323-5818
 An international journal of the Malacological Society of Australasia and 
the Society for the Study of Molluscan Diversity published by Magnolia Press

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Molluscan Research 30(3): 131-137; published 30 Nov. 2010
Copyright © The Malacological Society of Australasia & the Society for the Study of Molluscan Diversity

Distribution and abundance of the introduced gastropod Zeacumantus subcarinatus in the Sydney Region

V. ANDREWS1 , P. MIDDELFART 1,2, R.G. CREESE3, A. BROAD1 & A.R. DAVIS1*

1 Institute for Conservation Biology and Environmental Management, University of Wollongong, NSW 2522, Australia

2 Malacology Section, Australian Museum, Sydney NSW 2010, Australia

3 Industry and Investment NSW, Locked Bag 1 Nelson Bay, NSW 2315, Australia

* Author for correspondence: Email: adavis@uow.edu.au

Abstract

Zeacumantus subcarinatus is an endemic New Zealand gastropod which was first collected in the Sydney region in 1924. Although records have been maintained on the Australian Museum Database, there has been no formal assessment of its distribution and abundance since then. We undertook timed searches for this invader in 32 locations in the Sydney Region in Autumn 2004. It was present in nine locations, including one not previously recorded—Umina in Broken Bay. Further, Z. subcarinatus had disappeared from eight locations from which it had previously been reported. Population sizes were generally small, with the exception of Kurnell (Botany Bay), with an estimated >10,000 individuals. Comparisons of mobile and sessile fauna in pools confirmed that pools with the introduced gastropod were different from those lacking it, although there was considerable overlap in the ordination (nMDS) plots. Densities of littorinids (predominantly Austrolittorina unifasciata but also Afrolittorina acutispira) were three-fold lower when Z. subcarinatus was present in the pool. Zeacumantus subcarinatus is now present in the four major estuarine systems in the Sydney region and this may allow it to spread to additional locations within these systems. Management, such as manual removal, does not appear to be necessary at this stage, but we recommend a periodic re-examination of its distribution and abundance.

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