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The objective of this study was to explore the interrelationship between island area, number of species, and habitat diversity. A survey of dicotyledonous plant species was carried out on 45 uninhabited, unimproved, small islands off Shetland Mainland, plus two similar mainland headlands treated as islands. In addition, species were counted within 50-cm square quadrats randomly placed on island vegetation. The largest island surveyed was 100 ha; 81 plant species in all were found. A total of 14 physical (abiotic) habitat types were classified. The number of habitats on each island was counted, and the habitat types characteristic of each plant species were recorded. Island areas were determined from Ordnance Survey maps (...)
Kohn et al. (Wed,) studied this question.