Please use this identifier to cite or link to this item: https://doi.org/10.1007/s11258-017-0720-3
Title: Reconstructing the invasion history of a spreading, non-native, tropical tree through a snapshot of current distribution, sizes, and growth rates
Authors: CHONG KWEK YAN 
RAPHAEL, MARK BRIAN
CARRASCO TORRECILLA,LUIS R 
YEE THIAM KOON, ALEX
GIAM XINGLI
YAP VON BING 
TAN TIANG WAH,HUGH 
Keywords: invasive trees
spread rates
age-size relationships
range expansion
Cecropia
Macaranga
Issue Date: 1-Jun-2017
Publisher: Springer Verlag
Citation: CHONG KWEK YAN, RAPHAEL, MARK BRIAN, CARRASCO TORRECILLA,LUIS R, YEE THIAM KOON, ALEX, GIAM XINGLI, YAP VON BING, TAN TIANG WAH,HUGH (2017-06-01). Reconstructing the invasion history of a spreading, non-native, tropical tree through a snapshot of current distribution, sizes, and growth rates. Plant Ecology 218 (6) : 673-685. ScholarBank@NUS Repository. https://doi.org/10.1007/s11258-017-0720-3
Abstract: Elucidating the invasion history of non-native species has been dependent on coarse-grain and expensive methods or long-term monitoring during which the spread may have proceeded beyond feasible control. We used the case of a relatively recent introduction and spread of the neotropical Cecropia pachystachya in Singapore to develop a method for reconstructing spatio-temporal patterns of spread through a low-cost, cross-sectional study. Size and growth rates were measured for C. pachystachya trees as well as the native Macaranga gigantea. A power-expansion exponential-decline function was a better fit than the probability density function of the log-normal distribution in describing the growth-rate to size relationship for both species. C. pachystachya trees generally grew faster (up to 5.4 ± 0.1 cm per year at 12.2 ± 0.2 cm DBH) than M. gigantea trees (up to 3.8 ± 0.2 cm per year at 11.5 ± 0.3 cm DBH). We demonstrated that the integral of the reciprocal of these growth equations provides an estimate of the age of the individuals from their size. Using the size and geographic coordinates of C. pachystachya trees from an island-wide search, we estimate that the invasion front of reproductive trees (>5 cm DBH) showed at least a 20-year lag phase from the time of initial establishment to the year 2005, before advancing exponentially at median rates between 5-466 m year-1 with maximum rates of several km year-1. The extent of occurrence expanded by nearly 10-fold from 2004-2012. Consequently, the spatial dynamics of trees can be reproduced using ontogenetic growth functions.
Source Title: Plant Ecology
URI: http://scholarbank.nus.edu.sg/handle/10635/148323
ISSN: 1385-0237
DOI: 10.1007/s11258-017-0720-3
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