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Impacts of urbanization and agricultural legacy on taxonomic and functional diversity in isolated wetlands

  • Audréanne Loiselle
  • Stéphanie PellerinEmail author
  • Monique Poulin
Original Paper

Abstract

Land use changes pose major threats to biodiversity. In this study, we analysed the impacts of urbanization and agricultural legacy on plant communities of isolated wetlands (Laval, Québec, Canada). We sampled 35 marshes and 32 swamps. We used multi-factor analysis of variance to compare taxonomic richness and functional diversity between wetland types, urbanization levels and former agricultural use. We calculated beta diversity as between-site similarities in composition, and differences were evaluated using tests for homogeneity in multivariate dispersions. We also analysed the effect of exotic species on beta diversity. We found that urbanization and former agricultural use had no effect on taxonomic richness, functional diversity or beta diversity. However, exotics tended to be more abundant in urban and previously cultivated wetlands than in more natural ones. Furthermore, despite the absence of difference in beta diversity in response to present and past human disturbances when analysing the total species pool, we found that exotic species tend to favor homogenization. We also found that species composition differed in response to urbanization in marshes, while in swamps it differed according to former agricultural uses. This contrasting result was likely due to the fact that marshes are dominated by herbaceous species and swamps by woody species (short vs. long regeneration time). Our study highlights the importance of looking at different types of habitats within the same urban context and considering land use legacy to understand the response of ecosystems to urbanization, especially due to the time lag between disturbances and vegetation responses.

Keywords

Agricultural legacy Beta diversity Functional traits Marshes Urbanization Species composition Swamps 

Notes

Acknowledgements

This research received financial support from the Natural Sciences and Engineering Research Council of Canada (Discovery grant to S. Pellerin: RGPIN-2014-05367 and M. Poulin RGPIN-2014-05,663) and the Fonds Nature et technologies (scholarship to A. Loiselle). We are grateful to the City of Laval and landowners who allowed us to work on their lands. Our thanks to the CRE-Laval for their data and their logistical supports, numerous field assistants, Karen Grislis for linguistic revision and two anonymous reviewers for comments on an earlier draft of the manuscript.

Supplementary material

11273_2019_9692_MOESM1_ESM.docx (119 kb)
Supplementary material 1 (DOCX 119 kb)

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© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Institut de recherche en biologie végétale, Université de Montréal and Jardin botanique de MontréalMontrealCanada
  2. 2.Québec Center for Biodiversity ScienceMcGill UniversityMontrealCanada
  3. 3.Department of PhytologyUniversité LavalQuebecCanada

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