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• W2122377881 abstract "The literature is inconsistent regarding the ability of herbivory to control or reduce densities of a major invasive plant species of North America, spotted knapweed (Centaurea stoebe). Here, findings from experimental manipulations of spotted knapweed and long-term monitoring of seed production and insect abundance were used to parameterize a population matrix model for this species. Model predictions were compared against spotted knapweed densities observed in permanent transects, which were established after the release of biological controls. The model incorporated population-level compensation for adult mortality (increased growth from juveniles to adults). The model also incorporated newly reported results showing an interaction between precipitation and biological control impacts. We compared predictions from four alternate models against the observed population densities; models were: conspecific density-dependence, the effects of biological controls, precipitation, and biological control-precipitation interaction. The best model to explain population declines included the effects of biological control agents. Declines in population growth rates (λ < 1) were only predicted when reduced seed production and increased plant mortality due to biological controls were included. Results suggest that biological controls contributed to declines observed in field studies, and support the contention that biological control attenuates the ability of spotted knapweed to exploit favorable climatic conditions. The results also demonstrate that spotted knapweed control (i.e., conditions where λ < 1) depends upon a relatively large impact of biological control agents through high densities or large per capita impact; both of which are known to vary at our site and elsewhere. At our site spotted knapweed in certain habitats (e.g., disturbed riparian areas) is unlikely to be eradicated by insect herbivory, but spotted knapweed densities found in most other habitats can be reduced by biological control agents. Regardless, the management implications from these findings are that biological controls can intensify the efficacy of other control methods." @default.
• W2122377881 created "2016-06-24" @default.
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• W2122377881 date "2013-07-01" @default.
• W2122377881 modified "2023-09-27" @default.
• W2122377881 title "Biological control and precipitation effects on spotted knapweed (<i>Centaurea stoebe</i>): empirical and modeling results" @default.
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• W2122377881 doi "https://doi.org/10.1890/es13-00094.1" @default.
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