Marine Ecology Progress Series | |
Macrobioerosion of dead branching Porites, 4 and 6 years after coral mass mortality | |
T. R. McClanahan1  M. Carreiro-Silva1  | |
关键词: Calcium carbonate; Climate disturbance; Kenya; Marine protected areas; Monitoring; Pollution; Reef framework; Thermal anomaly; | |
DOI : 10.3354/meps09726 | |
学科分类:海洋学与技术 | |
来源: Inter-Research | |
【 摘 要 】
ABSTRACT: 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.
【 授权许可】
Unknown
【 预 览 】
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RO201912010134977ZK.pdf | 714KB | download |