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Originariamente inviata da sanzucht
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da recenti studi sembra che l alimentazione principale sia eterotrofa,basta pensare che in un ml troviamo oltre un milione di batteri...
i batteri forniranno poi ai coralli ammonio inorganico fosforo e tutto quello che si ingurgidano,se ho capito bene il nutrimento inorganico principale avviene attraverso i batteri..
gli sps a polipo piccolo possono intrappolare le prede come batterioplankton e zooplankton nel loro tessuto per poi portarle ai polipi.
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Proprio riguardo a questo, trascrivo questo trafiletto, sperando che qualcuno riesca tradurlo in maniera perfetta.. Scusate se ci sono errori..
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Other corals that depend more heavily on light may not capture large quantities of zooplankton prey, but they may depend on other nonzooxanthellate modes of feeding. Nitrogen is neede for growth, and mos small-polyped corals are among the fastest-growing species. Thus they have a large nitrogen requirement and must possess the means to fulfill it. In fact, even though almost all of the photosynthate produced by the zooxanthellae is traslocated to the polyp, small-polyped highly photosynthetic corals, like Acropora sp, may depend on particulate feeding and dissolved inorganic nitrate and ammonium for as much as 70% of their nitrogen needs and 60% of they carbon needs. The extracarbon is necessary for calcification. Since most respired carbon dioxide is used by the zooxanthellae, and most trascolated carbon is used for metabolic needs and lost as mucus, the carbon source used for calcification is primarily dissolved bicarbonate from seawater. Nonotheless, the amount on the species, the strain of zooxanthellae, and the ambient light conditions.
To further illustrate the importance of external food sources, the axial corallite of Acropora sp contains few (if any) zoocanthellae, and yet it is the most rapidly growing part of the coral colony. The nutrition needed to sustain these active cells must come from intracolonial trasport of organic material, and therefore from nutrition obtained by the feeding behavior of the coral.
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