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• W2023132481 startingPage "931" @default.
• W2023132481 abstract "I investigated reproduction in a three-year study of Echinacea angustifolia, purple coneflower, growing in a fragmented prairie landscape. I quantified the local abundance of flowering conspecifics at individual-based spatial scales and at a population-based spatial scale. Regression analyses revealed that pollen limitation increased while seed set and fecundity decreased with isolation of individual plants. Isolation, defined as the distance to the k(th) nearest flowering conspecific, was a good predictor of pollen limitation, for all nearest neighbors considered (k = 1-33), but the strength of the relationship, as quantified by R2, peaked at intermediate scales (k = 2-18). The relationship of isolation to seed set and fecundity was similarly strongest at intermediate scales (k = 3-4). The scale dependence of individual density effects on reproduction (density of flowering plants within x meters) resembled that of isolation. Analyses at a population-based scale showed that pollen limitation declined significantly with population size. Seed set and fecundity also declined with population size, but significantly so only in 1998. Whether quantifying local abundance with population- or individual-based measures, reproductive failure due to pollen limitation is a consistent consequence of Echinacea scarcity. However, individual-based measures of local abundance predicted pollen limitation from a wider sample of plants with a simpler model than did population size. Specifically, the largest site, a nature preserve, is composed of plants with intermediate individual isolation and, as predicted, intermediate pollen limitation, but its large population size poorly predicted population mean pollen limitation." @default.
• W2023132481 created "2016-06-24" @default.
• W2023132481 creator A5047665650 @default.
• W2023132481 date "2006-04-01" @default.
• W2023132481 modified "2023-09-30" @default.
• W2023132481 title "SCALE DEPENDENCE OF REPRODUCTIVE FAILURE IN FRAGMENTED Echinacea POPULATIONS" @default.
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• W2023132481 doi "https://doi.org/10.1890/0012-9658(2006)87[931:sdorfi]2.0.co;2" @default.
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