Degradation of mussel (Mytilus edulis) fecal pellets released from hanging long-lines upon sinking and after settling at the sediment
Degradation of mussel (Mytilus edulis) fecal pellets released from hanging long-lines upon sinking and after settling at the sediment
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DOI：
10.1139/f10-067
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发表时间：
2010-09-01
影响因子：
2.4
通讯作者：
Petersen, Jens Kjerulf
中科院分区：
文献类型：
--
作者：
Carlsson, Marita Sundstein;Glud, Ronnie Nohr;Petersen, Jens Kjerulf
长线贻贝养殖在世界许多沿海地区得到了很好的发展，养殖场下方同时进行的碳浓缩可能会对当地环境产生影响。采用多种互补孵化方法研究了贻贝(Mytilus Edulis)颗粒的降解过程。悬浮140h后，颗粒材料中的大部分不稳定部分已被降解。然而，由于我们研究地点的浅水深度(8米)，在下沉过程中只有很小一部分碳被释放到水柱中，其中接近50%的碳被迅速翻转。在沉积物中以实际浓度沉降的颗粒立即刺激了海底对O-2的吸收。升高的O2摄取量逐渐下降，96h后达到背景水平，此时大约25%的添加物质已被降解。颗粒的主要部分(75%)更难熔，留在沉积物中，在更长的时间尺度上被保留或降解。在实验室中观察到的底栖生物颗粒浓缩的定量响应通过现场捕集测量和从活跃的农场下面和远离活动的农场收集的沉积物的培养来证实。
Long-line mussel farming is well established in many coastal areas around the world, and the concurrent carbon enrichment below farms potentially can have local environmental impacts. The degradation of released mussel (Mytilus edulis) pellets was investigated by a number of complementary incubation approaches. After 140 h in suspension, most of the labile fraction of the pellet material had been degraded. However, because of the shallow water depth at our study site (8 m), only a minute fraction of carbon was released to the water column during sinking, of which similar to 50% was rapidly turned over. Pellets settling at the sediment in realistic concentrations immediately stimulated the benthic O-2 uptake. The elevated O-2 uptake gradually declined and reached the background level after 96 h, at which time similar to 25% of the added material had been degraded. The main fraction of pellets (75%) was more refractory and remained in the sediment where it was either retained or degraded on much longer time scales. The quantitative response of benthic pellet enrichment observed in the laboratory was confirmed by in situ trap measurements and incubations of sediment collected below and away from active farms.