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Differential Seed Dispersal by Birds of the Tree Casearia nitida (Flacourtiaceae)

Henry F. Howe and Richard B. Primack
Biotropica
Vol. 7, No. 4 (Dec., 1975), pp. 278-283
DOI: 10.2307/2989740
Stable URL: http://www.jstor.org/stable/2989740
Page Count: 6
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Differential Seed Dispersal by Birds of the Tree Casearia nitida (Flacourtiaceae)
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Abstract

Data are presented which demonstrate (1) flight patterns of frugivorous birds are responsible for directional patterns of seed dispersal, (2) these patterns influence seed mortality, and (3) dispersal of seeds away from the parent tree is more likely to result from behaviors characteristic of obligate frugivores (Ramphastos sulfuratus and R. swainsonii) than opportunistic frugivore/insectivores (Myiozetetes similis and M. granadensis) Investment by the parent tree in a seed carried by a specialized frugivore is less likely to be wasted than investment in a seed carried by an opportunistic frugivore because specialists are more likely to carry seeds away from areas of high seed mortality than opportunists.

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