Abstract
Abstract Data are presented on the taxonomic composition of the flora and fauna associated with the green alga Cladophora albida (Huds.) Kutz. from four rockpools (three high-shore and one mid-shore) from Great Cumbrae Is., Firth of Clyde. In addition, information on the annual cyclesoftemperature and salinity in the pools is given, as is an assessment of the ecological importance of various aspects of plant form (sand & detritus accumulation, frond twisting, presence oftubes of Fabricia). Diatoms dominate the epiflora of Cladophora together with cyanobacteria (blue-green algae). They are mostly confmed to the distal parts of the Cladophora filaments. 81 animal species from 21 groups were recorded, the dominant groups being nematodes and harpacticoid copepods. The majority of these meiofaunal organisms are micro-grazers, eating diatoms. The activities of so many grazers may assist the host alga to receive more light for photosynthesis. Five major modes oflife characterize the fauna: a) sessileanimals, b) ...
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