Institute of Biological and Environmental Sciences, Oceanlab, University ofAberdeen, Main Street, Newburgh, Aberdeenshire, Scotland AB41 6AA, UK.
Environ Sci Technol. 2010 Mar 15;44(6):2079-84. doi: 10.1021/es903073h.
The factors affecting patterns of benthic [seabed] biology and chemistry around 50 Scottish fish farms were investigated using linear mixed-effects models that account for inherent correlations between observations from the same farm. The abundance of benthic macrofauna and sediment concentrations of organic carbon were both influenced by a significant, albeit weak, interaction between farm size, defined as the maximum weight of fish permitted on site at any one time, and current speed. Above a farm size threshold of between 800 and 1000 t, the magnitude of effects at farms located in areas of elevated current speeds were greater than at equivalent farms located in more quiescent waters. Sediment concentrations of total organic matter were influenced by an interaction between distance and depth, indicating that wind-driven resuspension events may help reduce the accumulation of organic waste at farms located in shallow waters. The analyses presented here demonstrate that the production and subsequent fate of organic waste at fish farms is more complex than is often assumed; in isolation, current speed, water depth, and farr size are not necessarily good predictors of benthic impact.
采用线性混合效应模型，研究了影响 50 家苏格兰鱼类养殖场周围海底生物学和化学特征模式的因素，这些模型考虑了来自同一养殖场的观测值之间固有的相关性。底栖大型动物的丰度和有机碳在沉积物中的浓度都受到养殖场规模（定义为任何时候在现场允许的最大鱼类重量）与流速之间的显著但微弱的相互作用的影响。在养殖场规模阈值为 800 至 1000 吨之间时，位于高速水流区域的养殖场的影响幅度大于位于更平静水域的同等养殖场。总有机物质在沉积物中的浓度受到距离和深度之间相互作用的影响，这表明风驱动的再悬浮事件可能有助于减少位于浅水区的养殖场中有机废物的积累。这里提出的分析表明，鱼类养殖场中有机废物的产生及其随后的命运比人们通常假设的要复杂得多；孤立地看，流速、水深和养殖场规模不一定是底栖影响的良好预测因子。
