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We assessed the performance of two estimators of species richness, the Chao2 and the Coleman ‘random placement curve’. Using a dataset of intertidal fish from the Norwegian Skagerrak coast, we found that Chao2 was effective for low sampling intensity, often reaching asymptotic values for few samples, but for higher sampling intensity the performance deteriorated. For large samples, the Coleman random...
In coastal fish communities, both top-down and bottom-up processes influence the dynamics of individual species. Here, we demonstrate how advective processes in the coastal zone of the Skagerrak basin affect the main predator, the cod (Gadus morhua), as a bottom-up process, while gobies are influenced by top-down processes such as predation and competition. A model for the regulation of fish community...
Long-term temporal variation in the community structure of fish species richness over the period 1953-1994 along the Norwegian Skagerrak coast is analysed in relation to abiotic environmental factors (oxygen saturation, salinity and temperature respectively at the sea surface, 10 and 50m depth). Data on the observed number of fish species derive from a long-term and ongoing beach-seine monitoring...
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