Biotic homogenization of urban floras by alien species: the role of species turnover and richness differences

0464241 - BÚ 2017 RIV NL eng J - Článek v odborném periodiku
Lososová, Z. - Chytrý, M. - Danihelka, Jiří - Tichý, L. - Ricotta, C.
Biotic homogenization of urban floras by alien species: the role of species turnover and richness differences.
Journal of Vegetation Science. Roč. 27, č. 3 (2016), s. 452-459. ISSN 1100-9233. E-ISSN 1654-1103
Institucionální podpora: RVO:67985939
Klíčová slova: archaeophyte * neophyte * environmental filter
Kód oboru RIV: EF - Botanika
Impakt faktor: 2.924, rok: 2016

The spread of alien species has been changing the diversity of plant communities all over the world, perhaps most notably in urban habitats. It has been shown that alien species with different residence times have different impacts on the beta-diversity of urban plant communities: archaeophytes tend to contribute to homogenization, while neophytes tend to increase differentiation among sites. However, it has not been determined whether these processes result from changes in species turnover or from differences in species richness. Here, we use an additive partitioning framework to disentangle the contribution of species turnover and richness difference to beta-diversity patterns in invaded urban plant communities. We analysed the effects of alien species on beta-diversity of urban plant communities separately for archaeophytes and neophytes to assess whether the observed patterns differ between these two groups of species with different residence times in the invaded region. We used additive as well as non-additive measures of species turnover and richness difference. For this purpose, we proposed a new index that complements the recently proposed Podani-Schmera index of richness difference. We confirmed the results of earlier studies that neophytes tend to differentiate the urban plant communities, while archaeophytes tend to homogenize, although in some specific habitats they can also contribute to differentiation. The observed changes in beta-diversity were related to the turnover component of beta-diversity in most cases, especially for neophytes. In contrast, the richness difference component was not significantly different between neophytes and native species. The trends for archaeophytes were less consistent, but in most habitats their turnover and richness difference were not significantly different from native species.
Trvalý link: http://hdl.handle.net/11104/0265178