Abstract
Decades of anthropogenic flooding to create wetlands in spring for breeding waterfowl in the Canadian Prairies have produced undesirable successional shifts from open wetlands dominated by endemic Eleocharis palustris L. (spikerush), to habitats dominated by relatively closed communities of Typha latifolia L. (cattail). Using 2 greenhouse experiments, we examined the potential of specific drying regimes to cross moisture thresholds and achieve T. latifolia control while maintaining E. palustris. We assessed the morphologic (leaf density, shoot ratio, biomass) and biochemical (root carbohydrate) responses of transplanted T. latifolia and E. palustris to different soil hydrologic treatments, including continuous flooding (CF), field capacity (FC) moisture, and 5 different drying stress (DS) treatments ranging from 4 to 12 weeks in duration, including recovery during re-inundation. Our results suggest that both plant species are susceptible to low soil moisture, as exemplified by reduced growth and survival. Although T. latifolia recovery during reflooding declined with incremental severity of moisture stress, T. latifolia was more tolerant to drought than E. palustris, with soil moisture below 5% required to induce complete root mortality. We conclude that only very low soil moisture will achieve T. latifolia control, under which E. palustris will have to re-establish from seed.
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Acknowledgments
This research was supported by the University of Alberta and a grant from Ducks Unlimited Canada (DUC). Special thanks to Dr. Jonathan Thompson, Dave Kay, and Morgan Stromsmoe of DUC for providing the impetus for this research, as well as to the DUC field staff from the Brooks office in southern Alberta who assisted with various aspects of the study, including Stacey Wabick, Nathan Fontaine, and Brian Peers. The Department of Agricultural, Food and Nutritional Science at the University of Alberta provided the greenhouse space and facilities for the research, while staff at the Ecophysiology Laboratory in the Department of Renewable Resources provided expertise with carbohydrate analyses. We thank Dr. Laki Goonewardene for advice on statistical analysis, and many individuals for providing helpful comments on earlier versions of the manuscript, including Drs. Thompson, Lee Foote, Anne Naeth, Robert Hudson and Jeff Moseley, as well as an Associate Editor and 2 anonymous reviewers.
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Asamoah, S.A., Bork, E.W. Drought Tolerance Thresholds in Cattail (Typha latifolia): A Test Using Controlled Hydrologic Treatments. Wetlands 30, 99–110 (2010). https://doi.org/10.1007/s13157-009-0005-2
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DOI: https://doi.org/10.1007/s13157-009-0005-2