In-situ investigations on small-scale local and short-term changes of sublittoral macrobenthos in Lübeck Bay (western Baltic Sea)

Abstract

In-situ studies on sublittoral soft bottom macrofauna (depth: 14-16 m) employing the underwater laboratory (UWL) "Helgoland" were carried out. Sets of samples were compared for small-scale local and short-term changes in species richness, faunal abundance, numerical dominance, diversity, evenness, homogeneity, and similarity. It could be shown that minor differences in sediment quality can cause conspicuous heterogeneity within a small sampling area (diameter: ca. 100 m). Both spatfalt and mortality of benthic invertebrates can change the faunal structure within a short period (two months). The degree of change varies between species and thus at stations harbouring different faunal assemblages as welt.

Re-occurrence and bioindication status of the netted dog whelk Nassarius reticulatus (Linnaeus, 1758) in the Western Baltic Sea (Mecklenburg Bight, Germany)

“…Between 1962 and 1968 two living specimens of N. reticulatus were found by Schulz (1969aSchulz ( , 1969b in the Kadet Trench, which were the last records of this species in the Mecklenburg Bight for several decades. In numerous exhaustive macrozoobenthos surveys during the period from 1969 to 1996, no individuals of N. reticulatus were found (e.g., Rogal et al, 1978;Al-Hissni, 1989;Rumohr, 1993;Voigt et al, 1994;Prena et al, 1997). Based on these clear results, there is a high probability that since the end of the 1960s N. reticulatus had died out in the area.…”

Die Biomasse mariner Makrobenthos-Gesellschaften im Einflußbereich der Klärschlammverklappung vor der Elbemündung

“…Diese Streuung ist sicherlich -neben der Interpretation als "patchiness" -auch auf die Methode der Probennahme zurtickzufiihren (Stripp, 1969;Rogal, 1978).…”

A multiple coring system for use with scuba

“…; Anderson & Meadows, 1978) . The factors can influence faunal distributions (Gray, 1974 ;Eckman, 1979 ;Bailey-Brock, 1979 ;Woodin, 1978 ;Rogal et al, 1978) . If relationships between the fauna and these fine-scale environmental attributes are being studied, the precise positioning of samples becomes important .…”