期刊
MARINE ECOLOGY PROGRESS SERIES
卷 458, 期 -, 页码 103-122出版社
INTER-RESEARCH
DOI: 10.3354/meps09726
关键词
Calcium carbonate; Climate disturbance; Kenya; Marine protected areas; Monitoring; Pollution; Reef framework; Thermal anomaly
资金
- Wildlife Conservation Society (WCS)
- Fundacao para a Ciencia e a Tecnologia, Portugal
- European Social Fund under the III Community Support Board [SFRH/BD/789/2000, SFRH/BPD/34634/2007]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/789/2000, SFRH/BPD/34634/2007] Funding Source: FCT
Internal bioerosion by macroborers (polychaetes, sipunculans, bivalves, and sponges) was investigated in dead Porites branches collected from 8 coral reefs along the Kenyan coast, 4 and 6 yr after the 1998 mass mortality of corals. Levels of nutrients, benthic cover, and numbers of grazing and invertebrate-eating fish and sea urchins were measured and evaluated for their influence on macrobioerosion. The macroboring community composition was influenced by the grazer composition on each reef; worms were the major macroboring agent where sea urchin biomass was high, and sponges were the dominant agent where herbivorous fish biomass was high. Bivalves accounted for a small proportion of the internal bioerosion and were not measurably influenced by consumers or water quality. The total macrobioerosion rates in Porites branches ranged from 534 +/- 70 to 1134 +/- 44 g CaCO3 m(-2) (4 yr after the coral death) and 837 +/- 111 to 2149 +/- 314 g CaCO3 m(-2) (6 yr after the coral death). The macrobioerosion rates were linearly and positively correlated with chlorophyll a concentrations (chl a) in the water column 4 and 6 yr after the coral death. Sponge boring rates were also positively correlated to chl a 6 yr after coral death but not after the initial 4 yr. Consequently, the macrobioerosion rates responded to nutrient status, but the community of borers changed with the dominant grazers, which in turn were influenced by fisheries management.
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