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• W2113846475 abstract "Abstract Question: The Janzen‐Connell hypothesis predicts that herbivores and pathogens prevent seedlings from establishing in dense patches near adult conspecifics. Although many studies have investigated the Janzen‐Connell hypothesis, the environmental context – local or regional – in which juveniles establish is often overlooked. The objectives of this study were: (1) to evaluate Janzen‐Connell effects in contrasting environments, and (2) to incorporate microsite variation into the study of this hypothesis. Location: Pacaya‐Samiria Reserve, Peru. Methods: I assessed seedling performance of two tree species, Garcinia macrophylla and Xylopia micans , during one growing season. In an observational study, mortality and growth rates were regressed against distance to the nearest adult conspecific, conspecific seedling density, heterospecific plant density, and several abiotic variables in upland and floodplain forests. Field and shadehouse experiments were used to isolate distance‐ and density‐dependent effects. Results: Contrary to predictions, seedling survivorship increased in the presence of conspecific seedlings ( Garcinia ) and heterospecific understory plants ( Garcinia and Xylopia ) in the observational study. Survivorship in the field experiment, however, was unaffected by conspecific seedling density or adult proximity. In the shadehouse, Garcinia growth rates were highest in floodplain soils collected near adult conspecifics, but mortality was unrelated to the soil's habitat or proximity to an adult. Conclusions: The positive density dependence found in this study could have been produced by: (1) environmental factors that increase both density and survivorship, or (2) interspecific facilitation, if heterospecifics reduce herbivore or pathogen pressure on the focal species. Such interactions could help explain species coexistence in tropical forests." @default.
• W2113846475 created "2016-06-24" @default.
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• W2113846475 date "2009-02-01" @default.
• W2113846475 modified "2023-10-16" @default.
• W2113846475 title "Positive density dependence in seedlings of the neotropical tree species<i>Garcinia macrophylla</i>and<i>Xylopia micans</i>" @default.
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• W2113846475 doi "https://doi.org/10.1111/j.1654-1103.2009.05272.x" @default.
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