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- W2037551970 abstract "Abstract Given that changes in population size are slow, information on future prospects of long‐lived tree species is necessarily obtained from demographic models. We studied six threatened tree species in four Vietnamese protected areas: the broad‐leaved Annamocarya sinensis , Manglietia fordiana and Parashorea chinensis , and the coniferous Calocedrus macrolepis , Dacrydium elatum and Pinus kwangtungensis . With data from a 2‐year field study on recruitment, growth and survival, we constructed matrix models for each species. All species showed continuous regeneration, as indicated by annual seedling recruitment and inverse J‐shaped population structures. To evaluate the future prospects of our study species, we calculated three parameters: (1) asymptotic growth rates ( λ ) from matrix models indicated significant population declines of 2–3%/year for two species; (2) population trajectories for 50–100 years showed slight population declines (0–3%/year) for five species; and (3) the reproductive period required for an adult tree to replace itself was excessive for three of the six species, suggesting that these species presently have insufficient recruitment. Overall agreement of the three parameters was low, showing that reliance on just one parameter is risky. Combining the three parameters we concluded that prospects are good for Dacrydium and Parashorea , worrisome for Annamocarya , Manglietia and Pinus , and intermediate for Calocedrus . We argue that conservation should involve strict protection of (pre‐)adult trees, as their survival is crucial for population maintenance in all species (high elasticity). For species with poor demographic prospects, active intervention is required to improve seedling and tree growth, enrich populations with seedlings from controlled germination, and restore habitat. Finally, our study suggests that these conservation measures apply to long‐lived trees in general, given that their demography is highly similar. Such measures should be taken before populations decline below critical levels, as long‐lived species will respond slowly to management." @default.
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- W2037551970 date "2008-03-08" @default.
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- W2037551970 title "Conservation prospects for threatened Vietnamese tree species: results from a demographic study" @default.
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- W2037551970 doi "https://doi.org/10.1007/s10144-008-0079-3" @default.
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