Species Number, Island Area, and Isolation

Martin L. Cody

in Plants on Islands

Published by University of California Press

Published in print June 2006 | ISBN: 9780520247291
Published online March 2012 | e-ISBN: 9780520932722 | DOI:
Species Number, Island Area, and Isolation

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This chapter considers the plant species counts on the Barkley Sound islands and evaluates the extent to which species numbers vary over time. It assesses whether the data support an equilibrium value for island species counts, and how these counts are related to the more obvious variables of island area and isolation, and less obvious variables such as island topography and position within Barkley Sound. The chapter describes a number of factors that influence species richness on the islands—including area, isolation, elevation, and other topographical variables—positional factors which moderate exposure to storms or to colonists, and also historical concerns such as age since isolation.

Keywords: Barkley Sound; species counts; species numbers; island area; isolation; topography

Chapter.  7718 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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