|De toestand van de zoute natuur in Nederland: vissen, benthos en zeezoogdieren|
Meesters, H.W.G.; ter Hofstede, R.; De Mesel, I.G.; Craeymeersch, J.A.; Deerenberg, C.; Reijnders, P.J.H.; Brasseur, S.M.J.M.; Fey, F.E. (2009). De toestand van de zoute natuur in Nederland: vissen, benthos en zeezoogdieren. Rapporten (Wettelijke Onderzoekstaken Natuur & Milieu), 97. Wettelijke Onderzoekstaken Natuur & Milieu: Wageningen. 97 pp.
Part of: Rapporten (Wettelijke Onderzoekstaken Natuur & Milieu). Wageningen Universiteit: Wageningen. ISSN 1871-028X, more
Benthos; Indexes; Indicators; Marine environment; Marine fish; Marine mammals; Shellfish; ANE, Netherlands, Delta Area [Marine Regions]; ANE, Wadden Sea [Marine Regions]; Marine
|Authors|| || Top |
- Meesters, H.W.G., more
- ter Hofstede, R., more
- De Mesel, I.G., more
- Craeymeersch, J.A., more
- Deerenberg, C., more
- Reijnders, P.J.H., more
- Brasseur, S.M.J.M., more
- Fey, F.E., more
This report summarises available time series of fish, benthos and sea mammal data, and reports on statistical analyses to discover significant trends in the status of various species. The ecological quality of the marine systems was assessed on the basis of historical reference values. The results show that there is cause for concern, as many species show a downward trend, i.e., decreasing numbers. The situation is particularly unfavourable for many of the species in the Wadden Sea. A number of complications were encountered when calculating ecological quality. Since suitable historical reference values for fish and benthos (shellfish) species were unavailable, the average value over the first three years of the time series was used as a reference value. Since the time series do not all start from the same date, the reference values were not all based on thesame period. The combination of trends and quality assessments shows that many species are declining, although some species show disproportionate increases relative to the reference values, which may be related to climate change. Among the Wadden Sea species, however, there are very few species that are thriving.