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Wadden Sea seagrasses: where and why?
Philippart, C.J.M.; Dijkema, K.S.; van der Meer, J. (1992). Wadden Sea seagrasses: where and why?, in: Dankers, N.M.J.A. et al. (Ed.) Present and Future Conservation of the Wadden Sea: Proceedings of the 7th International Wadden Sea Symposium, Ameland 1990. 20: pp. 177-191
In: Dankers, N.M.J.A. et al. (Ed.) (1992). Present and Future Conservation of the Wadden Sea: Proceedings of the 7th International Wadden Sea Symposium, Ameland 1990. NIOZ: Texel. VIII, 301 pp., more

Also published as
  • Philippart, C.J.M.; Dijkema, K.S.; van der Meer, J. (1992). Wadden Sea seagrasses: where and why? Publ. Ser. Neth. Inst. Sea Res. 20: 177-191, more

Available in Authors 
Document type: Conference paper

Keyword
    Marine

Authors  Top 
  • Philippart, C.J.M., more
  • Dijkema, K.S., more
  • van der Meer, J., more

Abstract
    Wadden Sea seagrasses, Zostera noltii Hornem. and Zostera marina L., are declining in several parts of the Wadden Sea. Knowledge of the factors which determine seagrass; distribution is required to manage the specific habitat of the Wadden Sea and to prevent further decline. For this purpose, a habitat map of the Wadden Sea (scale 1:100,000) was divided into squares of 1 cm², representing 1 km² in the field. Values of several environmental factors (e.g. period of emersion, sediment type, sediment stability, region) and the presence of seagrasses were noted for each square in the intertidal zone. Possible effects of mean salinity of seagrass distribution were assumed to be reflected in regional effects. A logit model was assumed in statistical analysis. All the main individual environmental factors, as well as the interaction between period of emersion and region, were found to contribute significantly to the models for both seagrass species. The models showed that no seagrass is to be expected in the proximity of the main river estuaries, even under optimal conditions concerning period of emersion, sediment type and sediment stability. Further research on the effects of river output on seagrass growth is therefore recommended.

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