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Journal Molluscan Studies Advance Access originally published online on January 30, 2009
Journal of Molluscan Studies 2009 75(2):103-107; doi:10.1093/mollus/eyn045
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© The Author 2009. Published by Oxford University Press on behalf of The Malacological Society of London, all rights reserved

Comparison of gill surface morphology across a guild of suspension-feeding unionid bivalves

Heather S. Galbraith1,2, Sarah E. Frazier1,2, Brenda Allison1,2 and Caryn C. Vaughn1,2

1 Oklahoma Biological Survey, University of Oklahoma, Norman, OK 73019, USA; and 2Department of Zoology, 111 East Chesapeake St., Norman, Oklahoma 73019 USA

Correspondence: H.S. Galbraith; e-mail: hgalbraith{at}ou.edu


  Abstract

Freshwater mussels are found in dense, multi-species aggregations where the potential for resource partitioning should be high. One means by which mussels may be partitioning resources is through feeding on different food items. We compared gill morphology in four species of co-occurring freshwater mussels. We found differences in total gill surface area, density of latero-frontal cirri and the number of cilia per cirral plate, with one species, Actinonaias ligamentina, having the largest gills with densest cirral plates relative to the other three species. These differences in feeding structures might allow these species to utilize different food resources, or could be related to other functions performed by the gills, including respiration or brood storage.

(Received 15 August 2008; accepted 14 November 2008)


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