Universidad Complutense de Madrid
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Non-random co-occurrence of native and exotic plant species in Mediterranean grasslands



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Miguel Garcinuño, José Manuel de y Martín Forés, Irene y Acosta Gallo, Belén y Pozo Lira, Alejandro del y Ovalle, Carlos y Sánchez Jardón, Laura y Castro Parga, Isabel y Casado González, Miguel Ángel (2016) Non-random co-occurrence of native and exotic plant species in Mediterranean grasslands. Acta Oecologica, 77 . pp. 18-26. ISSN 1146-609X

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URL Oficial: http://dx.doi.org/10.1016/j.actao.2016.08.011


Invasion by exotic species in Mediterranean grasslands has determined assembly patterns of native and introduced species, knowledge of which provides information on the ecological processes underlying these novel communities. We considered grasslands from Spain and Chile. For each country we considered the whole grassland community and we split species into two subsets: in Chile, species were classified as natives or colonizers (i.e. exotics); in Spain, species were classified as exclusives (present in Spain but not in Chile) or colonizers (Spanish natives and exotics into Chile). We used null models and co-occurrence indices calculated in each country for each one of 15 sites distributed along a precipitation gradient and subjected to similar silvopastoral exploitation. We compared values of species co-occurrence between countries and between species subsets (natives/colonizers in Chile; exclusives/colonizers in Spain) within each country and we characterised them according to climatic variables. We hypothesized that: a) the different coexistence time of the species in both regions should give rise to communities presenting a spatial pattern further from random in Spain than in Chile, b) the co-occurrence patterns in the grasslands are affected by mesoclimatic factors in both regions. The patterns of co-occurrence are similar in Spain and Chile, mostly showing a spatial pattern more segregated than expected by random. The colonizer species are more segregated in Spain than in Chile, possibly determined by the longer residence time of the species in the source area than in the invaded one. The segregation of species in Chile is related to water availability, being species less segregated in habitat with greater water deficit; in Spain no relationship with climatic variables was found. After an invasion process, our results suggest that the possible process of alteration of the original Chilean communities has not prevented the assembly between the native and colonizer species together.

Tipo de documento:Artículo
Palabras clave:Community organization, Chile, Herbaceous species, Null models Spain, Transcontinental naturalization
Materias:Ciencias Biomédicas > Biología > Botánica
Ciencias Biomédicas > Biología > Ecología
Código ID:41123
Depositado:07 Feb 2017 13:48
Última Modificación:27 Sep 2017 11:43

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