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Habitat use by the hymenosomatid crab Amarinus lacustris (Chilton) in two south-eastern Australian rivers

Johnston, Kerrylyn and Robson, Belinda 2005, Habitat use by the hymenosomatid crab Amarinus lacustris (Chilton) in two south-eastern Australian rivers, Marine and freshwater research, vol. 56, no. 1, pp. 37-44, doi: 10.1071/MF04219.

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Title Habitat use by the hymenosomatid crab Amarinus lacustris (Chilton) in two south-eastern Australian rivers
Formatted title Habitat use by the hymenosomatid crab Amarinus lacustris (Chilton) in two south-eastern Australian rivers
Author(s) Johnston, Kerrylyn
Robson, Belinda
Journal name Marine and freshwater research
Volume number 56
Issue number 1
Start page 37
End page 44
Publisher CSIRO Publishing
Place of publication Collingwood, Vic.
Publication date 2005-02-04
ISSN 1323-1650
1448-6059
Keyword(s) decapoda
false-spider crabs
freshwater crabs
hymenosomatidae
log-linear modelling
pools
riffles
Summary The hymenosomatid crab Amarinus lacustris is abundant in some south-eastern Australian rivers; however, little is known of its ecology. Patterns of habitat use by crabs in rivers may be affected by seasonal changes in river discharge. This study investigates population characteristics, timing of reproduction and patterns of habitat use by A. lacustris in five riffle and pool habitats from each of the Hopkins and Merri Rivers in south-west Victoria, Australia, sampled over a twelve-month period. Distribution of Amarinus lacustris was similar between the two rivers, but log-linear modelling showed that there was a strong association between crab sex, habitat occupied and time of year because female A. lacustris showed a shift from riffle to pool habitats during March and April, coinciding with the non-gravid period of the year. Male crabs also showed a change in relative occurrence, occurring most often in riffles during winter–spring (July–November) but being equally common in both habitats in summer–autumn (January–May). These patterns are probably the result of the reproductive cycle of A. lacustris, which appears to show both ontogenetic and sex-related changes in habitat use during its life cycle, taking advantage of seasonal fluctuations in flow regime that may assist egg/larval development and dispersal.


Notes Published: 4 February 2005
Language eng
DOI 10.1071/MF04219
Field of Research 060204 Freshwater Ecology
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2005, CSIRO
Persistent URL http://hdl.handle.net/10536/DRO/DU:30003032

Document type: Journal Article
Collection: School of Ecology and Environment
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