Results of recent time-series observations for monitoring trends in large marine ecosystems with a focus on the North Sea
Daan, N. (1986). Results of recent time-series observations for monitoring trends in large marine ecosystems with a focus on the North Sea, in: Sherman, K. et al. (Ed.) Variability and management of large marine ecosystems. pp. 145-174
In: Sherman, K.; Alexander, L.M. (Ed.) (1986). Variability and management of large marine ecosystems. AAAS: USA. , meer
Examples of major changes in abundance and in biological parameters of some Norht Sea fish species are discussed, based on time-series observations derived from commercial catch data and research vessel surveys. It is concluded that the ongoing monitoring programs are capable of detecting long-term trends, but they have rarely added significantly to our understanding of the mechanisms behind the changes. There is a strong need for supplementing the extensive long-term monitoring programs by specific and detailed studies, which address testable hypotheses from the existing theory, in order to establish adequate management strategies fro exploited large marine ecosystems.
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