Institut des sciences de la mer à Rimouski, Université du Québec à Rimouski, 310 Allée des Ursulines, CP 3300, Rimouski, Québec G5L 3A1, Canada.
Mar Pollut Bull. 2013 Jan 15;66(1-2):92-104. doi: 10.1016/j.marpolbul.2012.11.003. Epub 2012 Dec 6.
This study reports the results of a field experiment using benthic mesocosms that examined dose-dependent effects of mussel biodeposition on the benthic environment. Mesocosms were placed in the natural sea bottom and subjected to one of eight levels of biodeposition (from 0 to 1400 mussels m⁻²). Most analyses indicated non-linear (i.e., threshold) effects. Sediment characteristics changed significantly between 200 and 400 mussels m⁻² as did multivariate community structure. Community structure effects were characterised by changes in abundances of species that are very sensitive or tolerant to organic loading. The multivariate AZTI Marine Biotic Index (M-AMBI) indicated that the benthic status changed from High to Good in all mesocosms receiving biodeposits. Sediments acted as a sink for oxygen (O₂), but results suggest O₂ sediment demand was not sensitive enough to evaluate organic loading impacts. Results from this and improved experiments can be used to determine the environmental carrying capacity of sites for bivalve culture.
本研究报告了一项使用底栖中型生物群进行的野外实验的结果，该实验研究了贻贝生物沉积对底栖环境的剂量依赖性影响。中型生物群被放置在自然海底，并接受了八种生物沉积水平（从 0 到 1400 个贻贝 m⁻²）之一的处理。大多数分析表明存在非线性（即阈值）效应。在 200 到 400 个贻贝 m⁻²之间，沉积物特征发生了显著变化，多变量群落结构也发生了变化。群落结构的变化特征是对有机负荷非常敏感或耐受的物种的丰度发生变化。多变量 AZTI 海洋生物指数（M-AMBI）表明，所有接受生物沉积的中型生物群的底栖状态都从高变为良好。沉积物充当氧气（O₂）的汇，但结果表明 O₂ 沉积物需求不够敏感，无法评估有机负荷的影响。本研究和改进实验的结果可用于确定贝类养殖场所的环境承载能力。
