期刊
MARINE BIOLOGY
卷 160, 期 5, 页码 1271-1283出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00227-013-2179-7
关键词
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资金
- Marine Living Resource Foundation grant
- NRF
- Andrew Mellon Foundation
- Ezemvelo KwaZulu-Natal Wildlife
- African Coelacanth Ecosystem Programme
- Council for Scientific and Industrial Research
- Isimangaliso Wetland Park World Heritage Site
- Tanga Coastal Resource Centre
- Triton Dive Charters
To resolve biogeographic limits and patterns on the east coast of Africa, the presence/absence and quantitative biomass data were collected from 55 shallow subtidal reefs along 4,800 km of coastline (5.2A degrees-31.1A degrees S). Multivariate analysis of distributions, trophic structure and biomass revealed two distinct marine provinces, the Tropical Indo-West Pacific and Subtropical Natal, with a transitional overlap (of ca. 120 km) located between Leven Point and Kosi Mouth on north-east South Africa. This region of overlap was one of three bioregions revealed by post hoc analyses. Biomass was unexpectedly highest in the tropics. 'Auto-heterotrophs' (species with autotrophic symbionts such as corals and clams), deposit feeders and grazers contributed significantly more biomass to the Tropical Indo-West Pacific Bioregion, whereas filter feeders dominated the Subtropical Natal Bioregion. 'Auto-heterotrophs' declined with latitude while filter feeders increased; soft corals made a defining contribution in the overlap bioregion. Possible underlying causes of these patterns include productivity, nutrient levels, riverine input, light penetration and temperature.
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