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Journal Molluscan Studies Advance Access published online on July 11, 2007
Journal of Molluscan Studies, doi:10.1093/mollus/eym013
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© The Author 2007. Published by Oxford University Press on behalf of The Malacological Society of London, all rights reserved

A SNAIL'S SPACE SETS A SNAIL'S PACE: MOVEMENT RATES OF LAVIGERIA GASTROPODS IN LAKE TANGANYIKA, EAST AFRICA

Ellinor Michel1,3,, Peter B. McIntyre2,3 and Jessica Chan3

1 Department of Zoology, Natural History Museum, London SW7 5BD, UK; 2 Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14853, USA; and 3 The Nyanza Project, c/o Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA

Correspondence: E. Michel; e-mail: e.michel{at}nhm.ac.uk


  Abstract

Endemic Lavigeria gastropods are diverse and common in the benthos of Lake Tanganyika. We used in situ studies of marked individuals to quantify rates of daily movement by three species, and test the effects of size, sex, reproductive status and parasitism on movement. Average net travel distance was 50 cm day–1, which corresponds to about 20 times shell length. Male L. coronata moved significantly farther than L. coronata females or L. grandis, and L. nassa of either sex. There were also significant differences among individuals within each group; however, these differences were not predicted by size, reproductive status or parasitism. We interpret greater movement of L. coronata males as a reflection of mate searching; the ratio of males to non-brooding, non-parasitized females was three times as high in L. coronata (21:1) as in the other species (6:1). Our results indicate that these snails are capable of moving considerable distances, and that the highly localized distribution of L. coronata populations is not simply a reflection of limited movement by individual snails.

(Received 20 September 2006; accepted 1 March 2007)


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