4.7 Article

Sediment trap height affects mass, particle size, and biogeochemical composition of material collected in an equatorial coral reef

期刊

MARINE POLLUTION BULLETIN
卷 183, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2022.114086

关键词

Vertical sediment gradient; Resuspension; Sedimentation; Singapore

资金

  1. National Research Foundation, Prime Minister's Office, Singapore [MSRDP-P03]

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Anthropogenic sedimentation is a major cause of declining coral cover worldwide. This study installed sediment traps at different heights above the substrate and found variations in sediment characteristics with increasing trap mouth height. These findings have implications for coral ecology and the standardization of sediment collection protocols.
Anthropogenic sedimentation is a major contributor to the worldwide decline in coral cover. Resuspension of benthic material can exacerbate the threat to corals, but evidence of vertical sediment gradients is limited. Here, we installed sediment traps at 10, 20, 30, 40, and 50 cm above the substrate at three equatorial reef sites for three months and determined the dry mass, particle size, and biogeochemical composition of the material collected. As the trap mouth height increased from 10 to 50 cm, dry mass decreased as sediments became finer, poorer in carbonate, and richer in silicate. Despite among-site differences in collected sediment, this vertical gradient was present in all trap arrays, likely driven by resuspension mechanisms on seabed sediments. These results have implications for coral vertical ecology and underline the importance of standardising sediment collection protocols.

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