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The outbreak of crown-of-thorns starfish has seriously threatened the ecological health of coral reefs, and the supplement of nutrients in seawater may be a key factor leading to the outbreak of starfish. Sandy sediments play a key role in regulating the nutrient concentration and structure in coral reefs. Therefore, crown-of-thorns starfish and sandy sediments were incubated using flow-through reactor, to analyze the effects of crown-of-thorns starfish excretion and dead body degradation on nutrient concentration and structure, and to explore the role of sandy sediments under activities of crown-of-thorns starfish. The results were as followed: (1) crown-of-thorns starfish excreted dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) at rates of (83.55±4.74) μmol/(ind.·h) and (2.53±0.03) μmol/(ind.·h), respectively, which maight provide nutritional conditions for the continuous outbreak of starfish; (2) sandy sediments could regulate the nutrient concentration changed by the excretion of starfish, about 70.7% of DIN and 91.4% of DIP were trapped in the sediments, but the increase of DIN/DIP caused by nutrient exchange at the sediment-seawater interface may be detrimental to coral growth; (3) the degradation of starfish organisms could promote the release of nutrients at the sediment-seawater interface. Based on the density of starfish, the released nutrients could cause the concentrations of DIN and DIP in the overlying water to increase by 0.32 μmol/L and 0.01 μmol/L, respectively, which maight promote the rapid growth of macroalgae and hinder the self-restoration of corals.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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