Flowering, growth and defence in the two sexes: consequences of herbivore exclusion for Salix polaris
作者： Carsten F. Dormann , Christina Skarpe
DOI: 10.1046/J.1365-2435.2002.00662.X
关键词: Salix polaris 、 Herbivore 、 Inflorescence 、 Biology 、 Sex ratio 、 Niche differentiation 、 Ecology 、 Salicaceae 、 Grazing 、 Willow
摘要: Summary 1 For a long time, dioecious plants have been model system for understanding the interactions between and herbivores. Differences in growth rate and, consequently, investment defence sexes may lead to skewed sex ratios due differential herbivory. 2 In this study we evaluated applicability of idea polar willow (Salix polaris), which site, Svalbard, displays female-biased ratio. 3 Excluding reindeer 3 years increased abundance male flowers one two vegetation types investigated. Growth rates differed only slightly sexes, with females investing more inflorescences. 4 The concentration chemical compounds (phenolics condensed tannins) did not differ sexes. 5 On basis these findings, that rate-dependent herbivory caused unbalanced ratio S. polaris has be rejected. Possibly an interaction niche differentiation female willows, combination grazing, produced observed ratio, but mechanism remains unclear.
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