Unravelling life history of the Inland Freshwater Crab Austrothelphusa transversa in seasonal tropical river catchments

Waltham, Nathan (2016) Unravelling life history of the Inland Freshwater Crab Austrothelphusa transversa in seasonal tropical river catchments. Australian Zoologist, 38 (2). pp. 217-222.

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Abstract

Few freshwater aquatic species have ecological traits that deal with the vagaries of flow in ephemeral tropical rivers. In northern Australia, the tropical freshwater crab, Austrothelphusa transversa (von Martens, 1868) is a conspicuous species that occupies seasonal rivers, where it is thought to estivate in underground burrows while waiting for summer rain. During a survey in seasonal river catchments the first photographic evidence was obtained of an estivating female crab containing 42 crablets under the abdomen plate. Uncovering this female with crablets suggests that egg development progressing to crablets occurs during the dry season estivation when crabs are underground and no water exists in river channels; if this is the case then this female crab may have been waiting for rain, to emerge and successfully continue the life cycle in water. Since 2012 the southern Gulf of Carpentaria has experienced below average rainfall, contributing to no or short flow periods over most of the landscape. In light of modelled climate change (which predicts an increase in the number of years with low rainfall in northern Australia), along with intensification of agriculture development, it is postulated that reduced access to water might become a regular challenge for this crab species. With more data the IUCN Red List status (Least concern) for this species might need further review.

Item ID: 46707
Item Type: Article (Research - C1)
ISSN: 0067-2238
Keywords: tropical rivers, waterholes, freshwater crabs, Austrothelphusa transervsa, water resource development, climate change, Australia
Funders: Office of Northern Australia, Northern Australia Sustainable Futures, TropWATER, CSIRO Water for a Healthy Country Flagship, CSIRO Sustainable Agriculture Flagship
Date Deposited: 20 Dec 2016 01:33
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060204 Freshwater Ecology @ 30%
05 ENVIRONMENTAL SCIENCES > 0501 Ecological Applications > 050101 Ecological Impacts of Climate Change @ 40%
06 BIOLOGICAL SCIENCES > 0608 Zoology > 060801 Animal Behaviour @ 30%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960807 Fresh, Ground and Surface Water Flora, Fauna and Biodiversity @ 50%
96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960506 Ecosystem Assessment and Management of Fresh, Ground and Surface Water Environments @ 50%
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