|Trends in settlement and growth of juvenile flatfish and shrimps at the tidal flats in the western Dutch Wadden Sea in relation to anthropogenic activities|
van der Veer, H.W.; Mom, B.; Witte, J. IJ. (1995). Trends in settlement and growth of juvenile flatfish and shrimps at the tidal flats in the western Dutch Wadden Sea in relation to anthropogenic activities. Mém. Mus. natl. hist. nat., Sér. A Zool. 162: 25-40
In: Mémoires du Muséum national d'Histoire naturelle. Série A, Zoologie. Editions du Muséum: Paris. ISSN 0078-9747, more
|Authors|| || Top |
- van der Veer, H.W.
- Mom, B.
- Witte, J. IJ.
Time-series over the period 1974-1993 on the settlement and growth of juvenile flatfish (i) (Pleuronectes platessa (/i) and (i) Platichthys flesus) (/i) and juvenile brown shrimp (i) (Crangon crangon) (/i) at the Balgzand, a tidal flat area in the western part of the Duch Wadden Sea are analysed, with the aim to determine the possible impact of anthropogenic activities on the productivity of juvenile flatfish and shrimp in this area. Two types of anthropogenic activities could be determined: (1) an eutrophication of the area from the 1960-ties onwards with maximum nutrient loadings in the 1980-ties, followed by a de-eutrophication from the mid 1980-ties onwards, and (2) a (variable) fishing activity in the area for bivalves (mussels and cockles). Both anthropogenic activities are acting indirectly (eutrophication) or directly (fishing) on the abundance of the macrozoobenthic, the main food source for both platfish and shrimps. Despite large year-to-year fluctuations in macrozoobenthis biomass, no effect on settlement and growth of flatfish and shrimps could be detected. Year-class strenght of both flatfish and shrimps appeared to be determined by other factors than the carrying capacity of the area where the juveniles grow up. For both groups, growth was only determined by prevailing water temperatures. At present, there is no indication of an impact of eutrophication on biomass or productivity of the major epibenthic predators at the Balgzand intertidal area