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Landscape Ecology

, Volume 23, Issue 1, pp 91–105 | Cite as

Using the landscape morphometric context to resolve spatial patterns of submerged macrophyte communities in a fluvial lake

  • Rosalie LéonardEmail author
  • Pierre Legendre
  • Martin Jean
  • André Bouchard
Research Article

Abstract

This study investigates the spatial heterogeneity of macrophyte communities in a fluvio-lacustrine landscape. We analysed the importance of the geomorphological point/bay pattern in structuring aquatic plant assemblages inside a 20-km-long littoral segment of a large fluvial lake. The abundance of 21 macrophyte species was surveyed in 232 quadrats along 24 transects perpendicular to the lakeshore. Two contrasting plant communities were identified, corresponding to the bay and point morphology of the study zone: a bay community characterized by Chara sp. and a point community dominated by Butomus umbellatus f. vallisneriifolius, Vallisneria americana, Potamogeton richardsonii and Myriophyllum sp. We subsequently investigated the spatial patterns within the bay and point communities. From a dataset containing local environmental variables, landscape morphometric descriptors, and spatial geographical positions of the sampling sites, variation partitioning of the species abundance table showed that more than two-thirds of the explained variation was spatially structured. Around half of the spatially structured variation was due to the spatially structured environment. We identified important broad-scale patterns in the vegetation correlated to the local environmental variables, mainly depth and sediment richness. The remaining half of the spatially structured variation in the aquatic plant communities was explained by the landscape morphometric context; shoreline complexity of the bay or point, relative width, duration of wind exposure, and fetch were the landscape descriptors explaining most of this variation. Our results indicate that the landscape morphometric context can resolve as much spatial patterning as environmental variables and should be considered when studying a large lake ecosystem.

Keywords

Lake Saint-François St. Lawrence River Submerged macrophyte communities Variation partitioning Spatial patterns Landscape morphometric context 

Notes

Acknowledgements

We would like to thank the Centre Saint-Laurent team from Environment Canada, especially M. Arseneau, G. Brault, and C. Lessard for fieldwork. We thank M. Pelletier for advice on sediment analysis, V. Champagne for the particle-size analysis, and J. Lacey for enriching discussions concerning the project. We are also grateful to H. Wagner, J. Vermaat and an anonymous reviewer for their insightful comments which helped to improve the manuscript. This study was supported by a Natural Science and Engineering Research of Canada scholarship to R.L., by NSERC grants to A.B. and to P.L., and by CSL funds to M.J.

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Rosalie Léonard
    • 1
    Email author
  • Pierre Legendre
    • 1
  • Martin Jean
    • 2
  • André Bouchard
    • 3
  1. 1.Département de sciences biologiquesUniversité de MontréalMontréalCanada
  2. 2.Centre Saint-Laurent, Environnement CanadaMontréalCanada
  3. 3.Institut de recherche en biologie végétaleUniversité de MontréalMontréalCanada

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