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Commensalism used by freshwater crayfish species to survive drying in seasonal habitats

journal contribution
posted on 2009-01-01, 00:00 authored by Kerrylyn Johnston, Belinda Robson
Gramastacus insolitus is a very small non-burrowing Australian freshwater crayfish with a restricted distribution, occurring almost exclusively in seasonal habitats throughout its range. It is listed as a threatened species but its strategy for surviving dry periods was unknown. Eight seasonal surveys of crayfish distribution showed that members of G. insolitus were never found at sites that were outside the distribution of two larger burrowing freshwater crayfish species, Geocharax falcata and Cherax destructor. Excavation of 80 burrows of members of G. falcata and C. destructor in three different seasonal habitats in the Grampians National Park, Victoria, Australia, revealed that individuals of G. insolitus found refuge from drying by estivating in cracks and shallow depressions at the side of the main burrow tunnels constructed by larger species. Members of G. insolitus were not found estivating at the surface, such as under fallen wood, nor was it usually found in crayfish burrows unoccupied by the host crayfish. This study indicates that members of G. insolitus are commensal upon larger crayfish species, using their burrows to survive the seasonal drying of their habitat. Conservation strategies for populations of G. insolitus will need to consider co-existing species of burrowing crayfish.

History

Journal

Invertebrate biology

Volume

128

Issue

3

Pagination

269 - 275

Publisher

Wiley-Blackwell Publishing, Inc

Location

United States

ISSN

1077-8306

eISSN

1744-7410

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2009, The Authors

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