The presence and type of substrate used in the culture tank
affects coral mortality, particularly mortality of coral nubbins
directly after fragmentation. According to Lirman (2000),
higher mortality was observed on sand, rubble and hard substrates, while no mortality was observed when fragments of
Acropora palmatawere placed on the top of live colonies of
the same species. Although the use of sediment may be negative to rear recent-fragmented corals, the presence of sediment may also be beneficial, as deep sand beds are one of the
main nutrient sinks, particularly for phosphorus and nitrogen, where denitrification and nitrogen and phosphate
assimilation take place (Fossa & Nilsen 1996). Sediments
keep nutrient levels low, so that corals can thrive without
being overgrown by algae and bacteria. Further, sediments
rich in detrital organic matter and bacteria can be used as a
nutritional source for corals in nature (Lealet al.2014e).
The presence and type of substrate used in the culture tankaffects coral mortality, particularly mortality of coral nubbinsdirectly after fragmentation. According to Lirman (2000),higher mortality was observed on sand, rubble and hard substrates, while no mortality was observed when fragments ofAcropora palmatawere placed on the top of live colonies ofthe same species. Although the use of sediment may be negative to rear recent-fragmented corals, the presence of sediment may also be beneficial, as deep sand beds are one of themain nutrient sinks, particularly for phosphorus and nitrogen, where denitrification and nitrogen and phosphateassimilation take place (Fossa & Nilsen 1996). Sedimentskeep nutrient levels low, so that corals can thrive withoutbeing overgrown by algae and bacteria. Further, sedimentsrich in detrital organic matter and bacteria can be used as anutritional source for corals in nature (Lealet al.2014e).
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