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The influence of deer browsing on the reproductive biology of Canada yew (Taxus canadensismarsh.)

✍ Scribed by Taber D. Allison

Publisher
Springer-Verlag
Year
1990
Tongue
English
Weight
502 KB
Volume
83
Category
Article
ISSN
0029-8549

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✦ Synopsis

Hand-pollination significantly increased seed production in a Canada yew (Taxus canadensis) population that had been browsed previously by white-tailed deer (Odocoileus virginianus) indicating that pollen availability limited seed production in this population. Handpollination did not significantly increase seed production in a population never browsed by deer. Deer-browsing significantly reduces yew density and pollen production, which in turn results in reduced pollination and seed production. Pollen limitation of yew seed production is an indirect effect of deer browsing on Canada yew and results from an interaction between the direct effect of deer browsing and the pollination syndrome of Canada yew. Artificially created female yews had lower seed set than monoecious yews when yew seed production was pollen-limited, but not when pollen did not limit seed production.

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## Abstract __Taxus cuspidata__ and __Taxus media var. Hicksii__ contain paclitaxel, among other taxoids, on the surface of the needles. These compounds were removed by 5‐s dipping of the needles in water just below its boiling point at 96Β°C and at 60Β°C and 40Β°C. __Taxus cuspidata__ contained a fou