| Autor: |
Kröncke, Ingrid, Zeiss, Bernd, Rensing, Christa |
| Zdroj: |
Senckenbergiana Maritima; Jul2001, Vol. 31 Issue 1, p65-82, 18p |
| Abstrakt: |
Macrofauna samples were collected quarterly from 1978 to 1999 in the sublitoral zone off Norderney, one of the East Frisian barrier islands. Abundance, biomass and species numbers of single species or taxonomic groups showed different long-term variability. Different species distribution patterns were found over time, according to different zoogeographical distribution or feeding mode. Temperature seemed to be a major factor in structuring the community. Cold winters in 1978/79 and 1995/96 had severely negative effects on the community. A clear shift in community structure has become obvious since 1988; this occurred in direct connection with an increasing North Atlantic Oscillation Index (NAOI). The mediator between the NAO and the benthos is the sea-surface temperature (SST). Additionally, increasing storm frequency since the late 80s has changed the hydrodynamic in the area and led to a higher resuspension of sediments, which changed the food availability for macro-fauna species, as well as sediment stability. The results are similar to other long-term changes in the North Sea and indicate a North Sea system shift at the end of the 80s, which was forced by climatic factors. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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