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Relationships between hydrological and limnological conditions in lakes of the Slave River Delta (NWT, Canada) and quantification of their roles on sedimentary diatom assemblages

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Abstract

Water chemistry and surface sediments were analyzed from 41 shallow lakes representing three previously-defined hydrological categories in the Slave River Delta, Northwest Territories, Canada, in order to identify relationships between hydrological and limnological conditions and their associations with recently deposited diatom assemblages. Evaporation-dominated lakes are physically removed from the influence of the Slave River, and are characterized by high alkalinity and high concentrations of nutrients and ions. In contrast, flood-dominated lakes tend to receive a pulse of floodwater from the Slave River during the spring thaw and have low alkalinity and low concentrations of most nutrients and ions. Exchange-dominated lakes are variably influenced by floodwaters from the Slave River and seiche events from Great Slave Lake throughout the spring thaw and open-water season, and are characterized by a broad array of limnological conditions that are largely dependent on the strength of the connection to these sources of floodwater. Specific diatom ‘indicator’ taxa have been identified that can discriminate these three hydrological lake categories. Evaporation-dominated lakes are associated with high relative abundance of common epiphytic diatom taxa, while diatoms indicative of flood- and exchange-dominated lakes span a wide range of habitat types (epiphytic, benthic) but also include unique planktonic diatoms (Stephanodiscus and Cyclostephanos taxa) that were not found in surface sediments of evaporation-dominated lakes. The planktonic diatom taxa originate from the Slave River, and thus are indicative of river influence. In complex, remote, freshwater ecosystems like the Slave River Delta, integration of results from hydrological and limnological approaches provides a necessary foundation to assess present, past and future hydroecological responses to changes in river discharge and climate.

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Acknowledgements

We thank the Deninu Kue First Nation, Deninu School (especially the Principal, Moh Odeen), K.P. Clogg-Wright, T.W.D. Edwards, M.C. English, Mr. G. Lafferty of Fort Resolution, and M. Morin of Wood Buffalo Helicopters for field and laboratory assistance and logistical services. Water chemistry analyses were conducted by Richard Carignan and his staff at the Water Chemistry Laboratory, University of Montreal. Funding for this study was provided by a NSERC Northern Research Chair and a Premier’s Research Excellence Award to B.B. Wolfe, a NSERC Discovery grant to R.I. Hall, Northern Scientific Training Program grant and Ontario Graduate Scholarships to M.A. Sokal, and BC Hydro.

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Authors and Affiliations

  1. Department of Biology, University of Waterloo, Waterloo, ON, Canada, N2L 3G1

    Michael A. Sokal & Roland I. Hall

  2. Department of Geography and Environmental Studies, Wilfrid Laurier University, Waterloo, ON, Canada, N2L 3C5

    Brent B. Wolfe

Authors
  1. Michael A. Sokal
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  2. Roland I. Hall
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  3. Brent B. Wolfe
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Correspondence to Michael A. Sokal.

Appendix

Appendix

Appendix  Diatom taxa (n = 88) found in ≥3 of the SD study lakes (n = 41) at ≥1% abundance in at least one lake, including number of occurrences, mean and maximum relative abundance. Taxon numbers correspond to those presented in Figs. 4 and 5 
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Sokal, M.A., Hall, R.I. & Wolfe, B.B. Relationships between hydrological and limnological conditions in lakes of the Slave River Delta (NWT, Canada) and quantification of their roles on sedimentary diatom assemblages. J Paleolimnol 39, 533–550 (2008). https://doi.org/10.1007/s10933-007-9128-8

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