Periphyton architecture and susceptibility to grazing by periwinkles (Littorina littorea, Gastropoda)

Sommer, Ulrich (1999) Periphyton architecture and susceptibility to grazing by periwinkles (Littorina littorea, Gastropoda) International Review of Hydrobiology, 84 (2). pp. 197-204. DOI 10.1002/iroh.199900020.

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Periphyton was grown on transparent plastic substrata in the Kiel Fjord and used for short-term laboratory experiments to study the feeding selectivity of the periwinkle Littorina littorea in response to the vertical structure of the periphyton. The susceptibility of algae to periwinkle grazing was assessed by comparing the species-specific biomass within the grazing tracks of the snails to the biomass outside the tracks. After 3 weeks of incubation, the periphyton consisted of a scattered monolayer of algal cells without vertical structure. No apparent grazing could be found. After 6 weeks of incubation, periphyton consisted of a tightly attached undergrowth (mainly Cocconeis scutellum, Bacillariophyceae, and Myrionema sp., Phaeophyceae) and canopy of filamentous (Melosira moniliformis, Bacillariophyceae) and stalked forms (Achnanthes longipes, Bacillariophyceae). The unicellular diatoms Fragilaria tabulata and Stauroneis constricta grew partly on the primary substratum and partly as epiphytes on the canopy species. The canopy species and the epiphytes were decimated inside the grazing tracks, while the tightly attached undergrowth species appeared ungrazed.

Document Type: Article
Keywords: benthic microalgae, periphyton, Littorina littorea, grazing, selectivity, architecture
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
Refereed: Yes
DOI etc.: 10.1002/iroh.199900020
ISSN: 1434-2944
Projects: Bedeutung biotischer Interaktionen fUr die Struktur des Mikrophytobenthos auf Hartsubstraten
Date Deposited: 18 Feb 2008 17:24
Last Modified: 30 May 2017 11:33

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