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Abstract. The effects of grazing by the molluscs Helix aspersa and Deroceros reticulatus on six plant species of early successional plant communities was studied. Mixtures of Hypochoeris radicata, Plantago lanceolata, Plantago major, Ranunculus acris and Lolium perenne were grown from seed and subjected to grazing. Percentage cover and total yield were determined for grazed and ungrazed mixtures. Grazing had a significant effect on four out of the five species and the differences between the two mollusc species were significant for four species.

INTRODUÇÃO o gênero Sargassum c. Agardh (Fucales, phaeophyceae) é um componente conspícuo da flora marinha bentônica de regiões tropicais e temperadas quentes e frias (Lüning 1990). Em costões rochosos protegidos do embate direto de ondas, espécies de Sargassum podem ser encontradas formando extensos bancos na zona sublitorânea rasa, sendo as macroalgas mais representativas em termos de altura e/ou biomassa,

The present data suggest that concrete may be a recommendable substrate for paint in an indoor environment. As the nature of the substrate conditions the rate and nature of VOC emissions from wet materials, it must be explicit when emissions from composite materials are reported, in order to allow comparisons and labelling of the product in terms of indoor air quality.

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