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Coexistence and Competitive Exclusion of Banksia hookeriana in the Presence of Congeneric Seedlings along a Topographic Gradient

Byron B. Lamont, Neal J. Enright and Stephen M. Bergl
Oikos
Vol. 56, No. 1 (Sep., 1989), pp. 39-42
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3566085
Stable URL: http://www.jstor.org/stable/3566085
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Coexistence and Competitive Exclusion of Banksia hookeriana in the Presence of Congeneric Seedlings along a Topographic Gradient
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Abstract

Banksia hookeriana is restricted to the midrange of a gradient from a sand dune swale to a sand-over-limestone ridge in Western Australia. As a monoculture, B. hookeriana seedlings established equally at three sites along the gradient. However, when mixed with seedlings of four other Banksia species abundant along the gradient, B. hookeriana was eliminated from all sites except where it occurs naturally. Drought stress, as measured by leaf xylem tension and stomatal conductance, increased with greater density of seedlings, with increase in elevation, and over summer. The negative interaction between certain habitats and interspecific competitive pressure in association with the first summer drought may account for the restricted distribution of this species.

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