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C onyza canadensis suppresses plant diversity in its nonnative ranges but not at home: a transcontinental comparison
Author(s) -
Shah Manzoor A.,
Callaway Ragan M.,
Shah Tabasum,
Houseman Gregory R.,
Pal Robert W.,
Xiao Sa,
Luo Wenbo,
Rosche Christoph,
Reshi Zafar A.,
Khasa Damase P.,
Chen Shuyan
Publication year - 2014
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.12733
Subject(s) - species richness , introduced species , biology , invasive species , ecology , native plant , range (aeronautics) , biomass (ecology) , solidago canadensis , abundance (ecology) , competition (biology) , materials science , composite material
Summary The impact of invasive species across their native and nonnative ranges is poorly quantified and this impedes a complete understanding of biological invasions. We compared the impact of the native N orth A merican plant, C onyza canadensis , which is invasive to E urasia, on species richness at home and in a number of introduced regions through well replicated transcontinental field studies, glasshouse experiments and individual‐based models. Our results demonstrated mostly negative relationships between C. canadensis abundance and native species richness in nonnative ranges, but either positive or no relationships in its native N orth A merican range. In glasshouse experiments, the total biomass of C onyza was suppressed more by species from its native range than by species from regions where it is nonnative, but the effects of C onyza on other species did not show a consistent biogeographical pattern. Finally, individual‐based models led to the exclusion of C onyza from N orth A merican scenarios but to high abundances in scenarios with species from the nonnative ranges of C onyza . We illustrate biogeographical differences in the impact of an invader across regional scales and suggest that inherent differences in one specific aspect of competitive ability, tolerance to the effects of other species, may play some role in these differences.