Environmental impacts of dredging and other sediment disturbances on corals: a review
A REVIEW ON RESERVOIR SEDIMENTATION STUDIES USING SATELLITE REMOTE SE…
A review of published literature on the sensitivity of corals to turbidity and sedimentation is presented, with an emphasis on the effects of dredging. The risks and severity of impact from dredging and other sediment disturbances on corals are primarily related to the intensity, duration and frequency of exposure to increased turbidity and sedimentation. The sensitivity of a coral reef to dredging impacts and its ability to recover depend on the antecedent ecological conditions of the reef, its resilience and the ambient conditions normally experienced. Results of these investigations have provided a generic understanding of tolerance levels, response mechanisms, adaptations and threshold levels of corals to the effects of natural and anthropogenic sediment disturbances. Coral polyps undergo stress from high suspended-sediment concentrations and the subsequent effects on light attenuation which affect their algal symbionts. Some individual coral species can tolerate short-term exposure days to suspended-sediment concentrations as high as mg L -1 while others show mortality after exposure weeks to concentrations as low as 30 mg L The duration that corals can survive high turbidities ranges from several days sensitive species to at least weeks tolerant species.
Sedimentation: the existentialist challenge to stereotypes
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