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Use of Alpha, Beta, and Gamma Diversity Measures to Characterize Seed Dispersal by Animals
Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
2012 (English)In: American Naturalist, ISSN 0003-0147, E-ISSN 1537-5323, Vol. 180, no 6, 719-732 p.Article in journal (Refereed) Published
Abstract [en]

Seed dispersal shapes ecological and evolutionary dynamics of plant populations. Here, we extend classical diversity measures to study the impact of disperser behavior on seed dispersal. We begin by extending our previous diversity structure approach, which partitioned seed source diversity within and among dispersal sites, into the more general framework of traditional diversity measures. This statistical approach allows an assessment of the extent to which foraging behavior shapes alpha and gamma diversity, as well as the divergence in seed sources among dispersal sites, which we call delta. We also introduce tests to facilitate comparisons of diversity among dispersal sites and seed vectors and to compare overall diversity among sampled systems. We then apply these tools to investigate the diversity blend of parentage resulting from seed dispersal by two avian seed vectors with very different social and foraging behaviors: (1) acorn woodpeckers, transporting Quercus agrifolia acorns, and (2) long-wattled umbrellabirds, transporting Oenocarpus bataua palm nuts. Using these diversity and divergence measures, we test the hypothesis that different foraging behaviors generate distinctive diversity partitions for the two focal tree species. This approach provides a new tool for assessment of the impact of dispersal agents on the seed source structure of plant populations, which can be extended to include the impact of virtually any propagule vector for a range of systems.

Place, publisher, year, edition, pages
Chicago: University of Chicago Press, 2012. Vol. 180, no 6, 719-732 p.
Keyword [en]
alpha diversity, beta diversity, seed dispersal by animals, genetic diversity, foraging behavior, frugivory
National Category
URN: urn:nbn:se:umu:diva-62779DOI: 10.1086/668202ISI: 000311090100005OAI: diva2:581642
Available from: 2013-01-02 Created: 2012-12-18 Last updated: 2013-01-02Bibliographically approved

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Scofield, Douglas G.
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Umeå Plant Science Centre (UPSC)
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