Details

Autor(en) / Beteiligte

• DiFazio, Stephen P.
• Wilson, Mark V.
• Vance, Nan C.

Titel

Factors limiting seed production of Taxus brevifolia (Taxaceae) in western Oregon

Ist Teil von

• American journal of botany, 1998-07, Vol.85 (7), p.910-918

Ort / Verlag

United States: Botanical Soc America

Erscheinungsjahr

1998

Quelle

Wiley Online Library

Beschreibungen/Notizen

• Seed production of Pacific yew (Taxus brevifolia), an understory conifer, was studied at four sites in western Oregon over 2 yr. The effects of pollen supplementation, overstory canopy, and predator exclusion on ovule attrition were examined. Supplemental hand-pollination of ten trees at two sites resulted in significantly increased rates of ovule development and a doubling of seed efficiency (ratio of seeds to ovules). However, seed efficiency still averaged 15% on branches receiving supplemental pollen, so pollination was not a primary factor limiting seed production. The number of developing ovules was positively associated with overstory openness, but seed production was not. Seed efficiency was negatively associated with overstory openness. Branches bagged to exclude vertebrate seed predators had higher seed production than unbagged branches at three of four sites for 2 yr. In contrast to unbagged branches, seed production on bagged branches was positively associated with overstory openness, as was the effectiveness of bagging. Therefore, both vertebrate predation and overstory were important in limiting seed production, and these factors interacted. Factors limiting seed production varied in importance among the four sites and between years, illustrating the importance of examining multiple limiting factors over several sites and years