Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel Nr.123 GEMEINSCHAFTSSTRUKTUREN, ABUNDANZ, BIOMASSE UND PRODUKTION DES MAKROZOOBENTHOS SANDIGER BÖDEN DER KIELER BUCHT IN 5 - 15m WASSERTIEFE COMMUNITY-STRUCTURES, ABUNDANCE, BIOMASS AND PRODUCTION OF MACROZOOBENTHOS INHABITING SANDY BOTTOMS OF KIEL BAY IN 5 - 15m WATERDEPTH T j O X -to V j.8 ^ / i f . ' V von THOMAS BREY Kopien dieser Arbeit können bezogen werden von: Institut für Meereskunde Abt. Meeresbotanik DüsternbrookerWeg202300Kiel ISSN 0341-8561
Summary 1. A study of the benthic macrofauna in the shallow water area ( 5 - 1 5 m depth) of Kiel Bay was carried out in the years 1982 and 1983. 178 samples were collected from 45 stations by means of a 0.1m2-VanVeen-grab. Annual macrobenthic succession and production was investigated at one station 8t the Schleisand near Schleinriinde (6m depth, fine sand). Samples were taken at 9 dates between April 1982 and April 1983. All samples were washed through a 1 mm sieve. 2. 97 macrobenthic species were found. The species with the highest frequency correspond to the character-species of the"Macoma—community" of PETERSEN (1918). With the exception of the areas with coarse, gravely sediment the average abundance amounted to 7350 ind./m2, the average biomass amounted to 14.5 gAFDW/m1. The annual production was estimated at ca. 30 gAFDW/m2. In the Flüggesand - Hohwachter Bucht area the biomass of the molluscs was about five times higher in comparison to the values found between 1962 and 1965 by KÜHLMORGEN-HILLE (1965). 3. In the 5 - 15 m depth area of Kiel Bay 5 macrozoobenthos-communities were identified by means of clusteranalysis. 1. "Gravel/coarse sand"-group: 34 species; no quantitative data. 2. "Hohwachter Bucht"-group; 46 species; 6500 ind./m*; 11.2 gAFDW/m2. 3. "Shallow water "-group: 47 species; 6250 ind./m*; 14.3 gAFDW/m2. 4. "Medium depthM-group: 67 species; 8760 ind./m2; 17.1 gAFDW/m2. 5. "Deep water"-group: 73 species; 6990 ind./m2; 13.6 gAFDW/m2. Group 4 and 5 are very similar with regard to their fauna, therefore their delimitation is still uncertain. 4. At the station Schleinriinde 59 species were found. Only 17 species were present on more than 6 of the 9 sampling dates. The annual average abundance of all species amounted to 9100 ind./m2, the annual average biomass amounted to 28 gAFDW/m2. The highest values were obtained in September 1982î 24950 ind./m2 and 46.3 gAFDW/m2; the lowest values occured in March 1983: 2850 ind./m2 and 7 gAFDW/m2. The annual macrobenthic production amounted to ca. 78 gAFDW/m*. Only 6 species had a production which was more than 1 gAFDW/m2. Cardium edule had the highest production: 40 gAFDW/m3. At the station Schleimiinde the annual macrobenthic production (78 gAFDW/m2) is more than twice as high as the average production of the remaining investegated area (30 gAFDW/m2). It also exeeds the production value for the area from 1 to 5 m depth (24 gAFDW/m2, W0RTHMANN 1976) as well as the production value for the area deeper than 15m depth (23.5 gAFDW/m2, ARNTZ and BRUNSWIG 1975) of Kiel Bay.