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O que é Cama de areia profunda?
Um método de filtragem biológica usado em alguns aquários marinhos. O substrato de areia extrafina (diâmetro de grão 0,05-0,2 mm) deve ter cerca de 10-15 cm (4-6”) de profundidade para garantir que uma grande parte da areia no fundo não seja exposta à circulação significativa de água. Isso permite que bactérias anaeróbicas colonizem as partes mais baixas do substrato, convertendo nitrato em nitrogênio gasoso, que então se dissipa para fora da água. Um leito de areia profundo estabelecido abriga uma grande variedade de organismos que vivem nas camadas superiores aeróbicas, como microcaranguejos, caracóis, estrelas do mar, copépodes e vermes. Essas criaturas cavam e derrubam os 2-3” superiores do leito de areia enquanto se alimentam e processam detritos particulados maiores em resíduos nitrogenados. Este é então movido para mais fundo no leito de areia por seu comportamento de escavação, onde é convertido em gás nitrogênio no fundo. As bolhas de gás que se formam então sobem dentro do leito de areia até serem liberadas na água, o gás escapando na superfície.
Sinônimos
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Nome de termo em inglês
Deep sand bed
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