Colonization and distribution of Nassarius reticulatus (Mollusca: Prosobranchia) in the newly created saline Lake Grevelingen
Lambeck, R.H.D. (1982). Colonization and distribution of Nassarius reticulatus (Mollusca: Prosobranchia) in the newly created saline Lake Grevelingen. Neth. J. Sea Res. 16: 67-79
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579; e-ISSN 1873-1406, more
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| Abstract |
After the Grevelingen estuary had been cut off from the North Sea in 1971 and was turned into a 108 km² saline lake, Nassarius reticulatus gradually colonized the area. Estimated average numbers increased from near 5 m-2 in spring 1976 to over 200 m-2 in spring 1977 and (ADW) biomass correspondingly from 0.25 g. m-2 to 2.1 g. m-2. Numbers consolidated in the years thereafter, whereas biomass increased further to 3.3 g.m-2 in spring 1981. Causal factors are discussed. Nassarius is widespread in the lake. Presumably sediment characteristics and eelgrass presence are of secondary importance in the distribution. Highest densities in 1981 occurred at 4 to 4.5 m depth, lowest in the deep channels. A similar pattern showed the total zoobenthic biomass. The distribution data suggest Nassarius to be mainly a secondary consumer, probably primarily a predator. |
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