Notes on the feeding of Ectemnorrhinus similis waterhouse (Curculionidae) adults on Marion Island

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Abstract
Little is known regarding the role of arthropods as herbivores on subantarctic islands. In grassland and drainage line communities on Marion Island maximum densities (up to 220/m2) of Ectemnorrhinus similis adults occur in March to April, representing a maximum biomass of ca. 1 g m-2. Captured beetles ingest approximately 14% of body weight per day of Acaena magellanica leaf material and 37% of body weight per day of Brachythecium rutabulum fronds. No significant feeding on Poa cookii leaves was observed. It is proposed that E. similis be regarded as a significant primary consumer on the island.