Families with highest proportions of rare species are not consistent between floras

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Abstract:

Abstract Aim

In this study we compare the incidence of rarity within lineages between three floras: Australia, North America and New Zealand. Methods

We used published data for absolute numbers of species and for numbers of rare species to ask three questions: 1. Do families have similar proportions of rare species in different floras? 2. Can proportions of rare species within families be interpreted with reference to biogeographic history of particular floras? and 3. Is the proportion of rare species consistent between families and genera within each flora? Results

Within families in each flora, genera usually had similar proportions of rare species; indicating processes determining rarity are in general not operating differentially within families. However, in comparisons within-family between floras, approximately 62% of comparisons showed significant differences in the proportion of rare species. Main conclusions

These results imply that there are no general rules whereby the particular traits a family possesses are conducive to rarity wherever they occur. Rather, such attributes must exert influence conditionally, in conjunction with the biogeographical and competitive setting where speciation and extinction or persistence has occurred.

Keywords: Rarity; continental comparisons; inconsistency; taxonomy

Document Type: Research Article

DOI: http://dx.doi.org/10.1046/j.1365-2699.2000.00424.x

Affiliations: School of Biological Sciences Macquarie University, NSW 2109, Australia

Publication date: May 1, 2000

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