NDLI: Ecology and conservation status of endemic freshwater crabs in Lake Tanganyika, Africa

Content Provider	Springer Nature Link
Author	Marijnissen, Saskia A. E. Michel, Ellir Cleary, Daniel F. R. McIntyre, Peter B.
Copyright Year	2008
Abstract	Sedimentation resulting from riparian deforestation has a wide range of detrimental effects on aquatic biodiversity, but predicting the full consequences of such disturbances requires an understanding of the ecosystem’s key functional components. We investigated the ecology and response to sedimentation of the diverse, endemic freshwater crabs of Lake Tanganyika, which may occupy important positions in littoral foodwebs. Our surveys revealed crab distribution patterns to be patchy, and that crabs can be locally abundant (0–28 individuals m−2). Crab densities decreased with depth and the dry mass of crab assemblages ranged from 0.0 to 117.7 g m−2. Comparisons among sites revealed significant effects of sedimentation on crab assemblage evenness, but provided no evidence that sedimentation has altered densities, incidence or species richness. The resilience of crabs to sedimentation might be related to their intraspecific dietary breadth. Stable isotope data (δ13C and δ15N) from crabs and their potential food resources indicated differences in trophic roles among endemic crab species. Overall, crabs occupy higher trophic positions than most other invertebrates, and they draw upon both benthic and planktonic energy pathways. The high biomass and top-predator status of some crab species suggests the potential for cascading effects on organisms lower in the food web.
Starting Page	1555
Ending Page	1573
Page Count	19
File Format	PDF
ISSN	09603115
Journal	Biodiversity and Conservation
Volume Number	18
Issue Number	6
e-ISSN	15729710
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-12-13
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aquatic invertebrates Benthos Littoral ecosystem Freshwater conservation Lake Tanganyika Stable isotopes Plant Sciences Tree Biology Evolutionary Biology
Content Type	Text
Resource Type	Article
Subject	Ecology Ecology, Evolution, Behavior and Systematics Nature and Landscape Conservation

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