Functional traits indicate faster resource acquisition for alien herbs than native shrubs in an urban Mediterranean shru
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ORIGINAL PAPER
Functional traits indicate faster resource acquisition for alien herbs than native shrubs in an urban Mediterranean shrubland Samantha D. Dı´az de Leo´n Guerrero . Georgina Gonza´lez-Rebeles Guerrero . Teresa M. Ibarra-Montes . Anaid Rodrı´guez Bastarrachea . Ramiro Santos Cobos . Stephen H. Bullock . Lawren Sack . Rodrigo Me´ndez-Alonzo
Received: 13 August 2019 / Accepted: 16 May 2020 Ó Springer Nature Switzerland AG 2020
Abstract In urban Mediterranean ecosystems, invasive alien plants should have characteristics that enable faster resource acquisition and utilization than native species. We tested this hypothesis by comparing stem and leaf functional traits from five abundant native woody shrubs and five of the most abundant alien species within an urban coastal scrub community in Ensenada, Baja California, Me´xico. Twelve anatomical and ecophysiological traits were studied: light-saturated CO2 assimilation rate, stomatal Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10530-020-02290-w) contains supplementary material, which is available to authorized users. S. D. Dı´az de Leo´n Guerrero T. M. Ibarra-Montes A. Rodrı´guez Bastarrachea R. Santos Cobos Posgrado en Ciencias de la Vida, Centro de Investigacio´n Cientı´fica y de Educacio´n Superior de Ensenada, Ensenada, B.C., Mexico e-mail: [email protected]
conductance, stem and leaf water potentials during transpiration, % stem allocation to bark, xylem and pith, stem xylem vessel diameter and density, leaf size, and % allocation to spongy and palisade mesophyll. Alien species varied more in these traits, and their trait combinations reflected less investment in long-lived tissues; they had higher CO2 assimilation and stomatal conductance rates, higher values of leaf and stem water potential, and higher allocation to pith, larger stem xylem vessels, and larger leaf areas. In contrast, native woody shrub species were relatively convergent in leaf and stem traits reflecting more conservative resource use. Within disturbed urban environments, alien species may outcompete the native stressG. Gonza´lez-Rebeles Guerrero Posgrado en Ciencias Biolo´gicas, Universidad Nacional Auto´noma de Me´xico, Ciudad De Me´xico, CDMX, Mexico e-mail: [email protected]
A. Rodrı´guez Bastarrachea e-mail: [email protected]
S. H. Bullock R. Me´ndez-Alonzo (&) Departamento de Biologı´a de la Conservacio´n, Centro de Investigacio´n Cientı´fica y de Educacio´n Superior de Ensenada, Ensenada, B.C., Mexico e-mail: [email protected]
R. Santos Cobos e-mail: [email protected]
S. H. Bullock e-mail: [email protected]
T. M. Ibarra-Montes e-mail: [email protected]
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S. D. Dı´az de Leo´n Guerrero et al.
tolerant species through rapid resource acquisition, enhanced by a broader set of functional trait combinations across species. Keywords Carbon assimilation Functional traits association Leaf water potentials Urban environments
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