|Seasonal fluctuations and production of nematode communities in the Belgian coastal zone of the North Sea|
Vincx, M. (1988). Seasonal fluctuations and production of nematode communities in the Belgian coastal zone of the North Sea, in: Wouters, K. et al. (Ed.) Symposium Invertebraten van België, samenvattingen, 25-26 nov. 1988. pp. 100
In: Wouters, K.; Baert, L. (Ed.) (1988). Symposium Invertebraten van België, samenvattingen, 25-26 nov. 1988. KBIN: Brussel. 106 pp., more
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|Document types: Conference paper; Summary|
Nematodes are the most abundant multicellular animals in marine sediments; they are also the only metazoans, which survive in heavily polluted areas. The seasonal fluctuations of the nematode community of a heavily polluted silty sand station along the Belgian east coast was examined based on the monthly samples during 1983-1985. The mean density of the total community varied between 55 ind./10 cm2 (Feb.1983) and 5610 ind./10 cm2 (Jun.1985). 32 species were found in this station; only four species have a frequency higher than 50 %. They are all non-selective deposit-feeders. Reproduction appeared to be continuous, although an increase in reproductive activity appeared in spring and autumn. The seasonal fluctuations of density, age structure and the yearly P/B were determined for Sabatieria punctata, Daptonema tenuispiculum, Ascolaimus sp.1 and for the whole community. The yearly P/B for S. punctata varies between 14.1 (1985) and 16.9 (1983); for D. tenuispiculum between 28.5 (1985) arid 31.9 (1983); for Ascolaimus sp.1 between 11.5 (1985) and 14.8 (1983) and for the whole community between 16.2 (1985) and 18.1 (1983). These are the first estimations of P/B ratios for nematode communities in the Southern Bight of the North Sea. From this, it appears that nematodes are a significant component in the energy flow of shallow water ecosystems.