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Stige LC Ottersen G Hjermann DØ Dalpadado P Jensen LK Stenseth NC 《Marine pollution bulletin》2011,62(2):395-398
Two factors determine whether pollution is likely to affect a population indirectly through loss of prey: firstly, the sensitivity of the prey to the pollutants, and secondly, the sensitivity of the predator population to loss of prey at the given life stage. We here apply a statistical recruitment model for Northeast Arctic cod to evaluate the sensitivity of cod cohorts to loss of zooplankton prey, for example following an oil spill. The calculations show that cod cohorts are highly sensitive to possible zooplankton biomass reductions in the distribution area of the cod larvae, and point to a need for more knowledge about oil-effects on zooplankton. Our study illustrates how knowledge about population dynamics may guide which indirect effects to consider in environmental impact studies. 相似文献
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Herring as a major consumer in the Norwegian Sea 总被引:4,自引:1,他引:4
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Ingrid H. Ellingsen Padmini Dalpadado Dag Slagstad Harald Loeng 《Climatic change》2008,87(1-2):155-175
The Barents Sea is a high latitude ecosystem and is an important nursery and feeding area for commercial fish stocks such
as cod, capelin and herring. There is a large inter-annual variability both in physical and biological conditions in the Barents
Sea. Understanding and predicting changes in the system requires insight into the coupled nature of the physical and biological
interactions. A coupled physical and biological ocean model is used to study the impact of postulated future atmospheric changes
on the physical and biological conditions in the Barents Sea. Results from this simulation not only show that there is a large
variability in the physical conditions on a wide range of time scales, but also that the temperature in the Barents Sea is
increasing. The corresponding ice cover decrease is most noticeable in the summer months. The changes in physical properties
will most likely have an impact on the biotope. On average, the primary production increases slightly over a 65 year long
period, about 8%, partly due to an increased production in the northern Barents Sea. The model further simulates that the
production of Atlantic zooplankton species increases approximately 20% and becomes more abundant in the east. The Arctic zooplankton
biomass decreases significantly (50%) causing the total simulated production to decrease. 相似文献
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