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Landscape Ecology

, Volume 29, Issue 1, pp 67–79 | Cite as

Riverscape heterogeneity explains spatial variation in zooplankton functional evenness and biomass in a large river ecosystem

  • Philippe MassicotteEmail author
  • Jean-Jacques Frenette
  • Raphaël Proulx
  • Bernadette Pinel-Alloul
  • Andrea Bertolo
Research article

Abstract

Ecologists have long focused on local-scale phenomena (i.e. local environment variables) and assumed that spatial processes were unimportant factors influencing both the community structure and the functional diversity of aquatic communities. In this paper we used zooplankton assemblages in a typical large river (St. Lawrence River) as a biological model to examine the roles of (1) local environmental conditions (physicochemical characteristics of the water column), (2) broad-scale connectivity (a proxy for dispersion potential), and (3) habitat heterogeneity (a proxy for niche diversity) on the structure and the diversity of lotic communities. Together, these three sets of descriptors explained respectively 52, 49 and 59 % of the variation in zooplankton total biomass, functional diversity and community structure. After partialling out the roles of local environmental conditions and broad-scale connectivity, we demonstrated that habitat heterogeneity alone is a key driver of zooplankton total biomass and functional evenness at the riverscape level. In homogeneous and temporally stable habitats, zooplankton communities had higher biomass and functional evenness but lower species richness. Conversely, zooplankton had lower biomass and higher species richness in heterogeneous and unstable habitats, suggesting that zooplankton species can coexist because disturbances prevent competitive exclusion from occurring. This is the first study to reveal how local environmental conditions, spatial connectivity and habitat heterogeneity operate jointly to determine the functional diversity and structure of aquatic communities in a natural ecosystem.

Keywords

Community structure Functional diversity Riverscape Spatial connectivity Habitat heterogeneity Variation partitioning St-Lawrence river Zooplankton 

Notes

Acknowledgments

We gratefully acknowledge the captain, François Harvey, and crew of the RV Lampsilis for their invaluable support during the expedition on the St. Lawrence River. We are thankful to Simon de Sousa, Virginie Roy, and Ginette Méthot for their assistance during field sampling and to Édith Cusson and Lama Aldamman for taxonomic analyzes of zooplankton. We thank A.-L. Larouche, C. Martin, D. M’Radamy, P. Thibeault and A. Veillette for help in the field and in the lab. M. Gosselin and C. Nozais kindly shared the bacterial data. Katherine Roach gave helpful comments on an earlier version of the manuscript. This research was funded by the Natural Sciences Research Council of Canada (NSERC ship time and discovery programs) and the Fonds Québécois de la Recherche sur la Nature et les Technologies (FQRNT) to J.-J.F. P. Massicotte was supported by a Centre de Recherche sur les Interactions Bassins Versants- Écosystèmes aquatiques (RIVE) postdoctoral fellowship from university of Québec at Trois-Rivières. The Matlab (version 2011b) code implemented to calculate heterogeneity metrics is available upon request to the authors.

Supplementary material

10980_2013_9946_MOESM1_ESM.pdf (121 kb)
Supplementary material 1 (PDF 120 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Philippe Massicotte
    • 1
    Email author
  • Jean-Jacques Frenette
    • 1
  • Raphaël Proulx
    • 1
  • Bernadette Pinel-Alloul
    • 2
  • Andrea Bertolo
    • 1
  1. 1.Department of Environmental ScienceUniversité du Québec à Trois-RivièresTrois-RivièresCanada
  2. 2.Université de MontréalMontréalCanada

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