Land-use change and propagule pressure promote plant invasions in tropical rainforest remnants
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RESEARCH ARTICLE
Land-use change and propagule pressure promote plant invasions in tropical rainforest remnants Emily H. Waddell . Lindsay F. Banin . Susannah Fleiss . Jane K. Hill . Mark Hughes . Ahmad Jelling . Kok Loong Yeong . Bernadus Bala Ola . Azlin Bin Sailim . Joseph Tangah . Daniel S. Chapman
Received: 14 December 2019 / Accepted: 29 June 2020 Ó The Author(s) 2020
Abstract Context Intact tropical rainforests are considered robust to plant invasions. However, land-use change alters the structure and species composition of native forest, opening up tropical landscapes to invasion. Yet, the relative roles of key drivers on tropical forest invasions remain little investigated. Objectives We examine factors affecting plant invasion of rainforest remnants in oil-palm dominated landscapes in Sabah, Malaysian Borneo. We hypothesized that invasion is greater in highly fragmented
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10980-020-01067-9) contains supplementary material, which is available to authorized users. E. H. Waddell (&) L. F. Banin D. S. Chapman UK Centre for Ecology & Hydrology, Bush Estate, Penicuik EH26 0QB, UK e-mail: [email protected] E. H. Waddell S. Fleiss J. K. Hill Department of Biology, University of York, Wentworth Way, York YO10 5DD, UK E. H. Waddell M. Hughes Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh EH3 5LR, UK
landscapes, and in disturbed forests with lower native plant diversity (cf. old-growth rainforests). Methods Native and exotic plants were surveyed in 47 plots at 17 forest sites, spanning gradients in landscape-scale fragmentation and local forest disturbance. Using partial least squares path-modelling, we examined correlations between invasion, fragmentation, forest disturbance, propagule pressure, soil characteristics and native plant community. Results We recorded 6999 individuals from 329 genera in total, including eight exotic species (0–51% of individuals/plot, median = 1.4%) representing shrubs, forbs, graminoids and climbers. The best model (R2 = 0.343) revealed that invasion was correlated with disturbance and propagule pressure (high prevalence of exotic species in plantation matrix), the K. L. Yeong Leverhulme Centre for Climate Change Mitigation, University of Sheffield, Sheffield S10 2TN, UK J. Tangah Sabah Forestry Department, Forest Research Centre, P.O. Box 1407, 90715 Sandakan, Sabah, Malaysia D. S. Chapman Biological and Environmental Sciences, Faculty of Natural Sciences, University of Stirling, Stirling FK9 4LA, UK
A. Jelling K. L. Yeong B. B. Ola A. B. Sailim South East Asia Rainforest Research Partnership, Danum Valley Field Centre, PO Box 60282, 91112 Lahad Datu, Sabah, Malaysia
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Landscape Ecol
latter being driven by greater fragmentation of the landscape. Our models revealed a significant negative correlation between invasion and native tree seedlings and sapling community diversity. Conclusions Increasing landsca
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