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Article: Geographic trends in mangrove crab abundance in East Africa

TitleGeographic trends in mangrove crab abundance in East Africa
Authors
KeywordsGeographic trends
East Africa
Crab biomass
Crab abundance
Mangroves
Issue Date2002
Citation
Wetlands Ecology and Management, 2002, v. 10, n. 3, p. 203-213 How to Cite?
AbstractThe aim of this work was to determine the abundance of crabs in mangrove communities along a latitudinal gradient along the eastern coast of Africa from 4°S to 32°S. Surveys were made at Mombasa (Kenya), Zanzibar (Tanzania), Maputo (Mozambique) and in the Transkei (South Africa). Crabs were estimated at three designated levels in the mangroves by visual census using a common protocol, and numbers were converted to biomass. Even after standardising the selection of sites and methods of census there was still extensive variability in the data, emphasising the complex heterogeneity of mangrove ecosystems. Lunar phase (full versus new moon springs) did not have a consistent effect on results, but shore height had several effects. Total crab biomass was similar in the two lower shore strata examined, but about twice as high at the top-Avicennia level. The ratio of grapsid biomass:ocypodid biomass also changed with height: from near unity in the lower mangrove, to 0.14 in the middle strata, but to 15 at the top. There was no consistent latitudinal trend in total crab numbers, but total crab biomass increased from north to south. In addition there was a consistent and marked change in the grapsid biomass:ocypodid biomass ratio: this swung from 0.65 at Mombasa to 6.8 in the Transkei. This has implications for the transfer of primary production through the food chain. Grapsids are important macrophagous feeders on the leaves and other parts of mangroves, whereas ocypodids are microphagous deposit feeders.
Persistent Identifierhttp://hdl.handle.net/10722/219361
ISSN
2015 Impact Factor: 1.407
2015 SCImago Journal Rankings: 0.565

 

DC FieldValueLanguage
dc.contributor.authorHartnoll, R. G.-
dc.contributor.authorCannicci, Stefano-
dc.contributor.authorEmmerson, W. D.-
dc.contributor.authorFratini, S.-
dc.contributor.authorMacia, A.-
dc.contributor.authorMgaya, Y.-
dc.contributor.authorPorri, F.-
dc.contributor.authorRuwa, R. K.-
dc.contributor.authorShunula, J. P.-
dc.contributor.authorSkov, M. W.-
dc.contributor.authorVannini, M.-
dc.date.accessioned2015-09-23T02:56:53Z-
dc.date.available2015-09-23T02:56:53Z-
dc.date.issued2002-
dc.identifier.citationWetlands Ecology and Management, 2002, v. 10, n. 3, p. 203-213-
dc.identifier.issn0923-4861-
dc.identifier.urihttp://hdl.handle.net/10722/219361-
dc.description.abstractThe aim of this work was to determine the abundance of crabs in mangrove communities along a latitudinal gradient along the eastern coast of Africa from 4°S to 32°S. Surveys were made at Mombasa (Kenya), Zanzibar (Tanzania), Maputo (Mozambique) and in the Transkei (South Africa). Crabs were estimated at three designated levels in the mangroves by visual census using a common protocol, and numbers were converted to biomass. Even after standardising the selection of sites and methods of census there was still extensive variability in the data, emphasising the complex heterogeneity of mangrove ecosystems. Lunar phase (full versus new moon springs) did not have a consistent effect on results, but shore height had several effects. Total crab biomass was similar in the two lower shore strata examined, but about twice as high at the top-Avicennia level. The ratio of grapsid biomass:ocypodid biomass also changed with height: from near unity in the lower mangrove, to 0.14 in the middle strata, but to 15 at the top. There was no consistent latitudinal trend in total crab numbers, but total crab biomass increased from north to south. In addition there was a consistent and marked change in the grapsid biomass:ocypodid biomass ratio: this swung from 0.65 at Mombasa to 6.8 in the Transkei. This has implications for the transfer of primary production through the food chain. Grapsids are important macrophagous feeders on the leaves and other parts of mangroves, whereas ocypodids are microphagous deposit feeders.-
dc.languageeng-
dc.relation.ispartofWetlands Ecology and Management-
dc.subjectGeographic trends-
dc.subjectEast Africa-
dc.subjectCrab biomass-
dc.subjectCrab abundance-
dc.subjectMangroves-
dc.titleGeographic trends in mangrove crab abundance in East Africa-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.doi10.1023/A:1020123713133-
dc.identifier.scopuseid_2-s2.0-0036622853-
dc.identifier.volume10-
dc.identifier.issue3-
dc.identifier.spage203-
dc.identifier.epage213-

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