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Littoral Benthos of the Northern Baltic Sea. III. Macrobenthos of the Hydrolittoral Belt of Filamentous Algae on rocky shores in Tvärminne
Author(s) -
Hällfors Guy,
Kangas Pentti,
Lappalainen Annikki
Publication year - 1975
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19750600303
Subject(s) - macrobenthos , littoral zone , benthos , dominance (genetics) , algae , ecology , invertebrate , biology , dry weight , amphipoda , fucus vesiculosus , detritivore , oceanography , abundance (ecology) , benthic zone , crustacean , botany , geology , biochemistry , gene
The community composition was studied quantitatively in two localities in 1968‐1970. The average ash‐free dry weights of the plants in a fully exposed and a moderately exposed locality were 48.6 g. m −2 and 93.3 g. m −2 , respectively. The average animal ash‐free dry weights were 2.52 g. m −2 and 3.45 g. m −2 . and the average numbers of animal individuals were 5360 m −2 and 15450. m −2 . The communities are characterized by the strong dominance of a few species. viz. Cladophora glomerata. Gammarus spp. and Chironomid larvae. The species diversity is thus very low. The seasonal aspects of species composition and abundance are presented. and some factors causing the differences between the localities are discussed.