营养盐和污染物对海洋生态系统食物链〈动〉<动>动力学的联合影响
Joint effects of nutrients and contaminants on the dynamics of a food chain in marine ecosystems
摘要：
利用分歧分析方法，分析了污染物和营养盐负荷对海洋食物链〈动〉<动>种群动力学的联合影响。污染物毒性被假定为改变某些物种的死亡率与S形剂量反应关系。污染物的一般影响是延迟过渡到复杂的动态状态，向更高的营养负荷值，但更违反直觉的后果所产生的间接影响进行了说明。特别是，顶级捕食者似乎是受污染物影响更大的物种，即使污染物仅对较低的营养级有毒。
英文摘要：
We analyze the joint effect of contaminants and nutrient loading on population dynamics of marine food chains by means of bifurcation analysis. Contaminant toxicity is assumed to alter mortality of some species with a sigmoidal dose-response relationship. A generic effect of pollutants is to delay transitions to complex dynamical states towards higher nutrient load values, but more counterintuitive consequences arising from indirect effects are described. In particular, the top predator seems to be the species more affected by pollutants, even when contaminant is toxic only to lower trophic levels.
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