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Phototropism of Whole Trees: Effects of Habitat and Growth Form

Craig Loehle
The American Midland Naturalist
Vol. 116, No. 1 (Jul., 1986), pp. 190-196
DOI: 10.2307/2425951
Stable URL: http://www.jstor.org/stable/2425951
Page Count: 7
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Phototropism of Whole Trees: Effects of Habitat and Growth Form
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Abstract

The hypothesis that phototropism applies to entire trees as well as to apical meristems was tested. The hypothesis was correct but with important modifications: (1) canopy emergent species exhibit very little phototropic response; (2) streamside species exhibit significantly more response than upland species. Costs and benefits of learning are shown to provide an evolutionary explanation for these differences. Extrapolation of the cost/benefit model yields predictions about what habitats are likely to select for phototropic response.

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