Abstract
Cootes Paradise Marsh (CP) is an urban wetland and is part of the Hamilton Harbour Area of Concern (AOC). Anthropogenic stressors have degraded the system’s water quality. Submerged aquatic vegetation (SAV) provides critical fish habitat, and its recovery is crucial to this AOC’s delisting efforts. We developed predictive models to recommend water clarity (Secchi depth) targets that can potentially achieve a minimum SAV presence of 230 ha in CP, using macrophyte monitoring data that have been collected since 1996 by the Royal Botanical Gardens (RBG). A random forest approach was used for modelling SAV presence and SAV % cover. The final model for predicting presence of SAV consisted of Secchi depth, west wind fetch, and water level; the model had high accuracy (accuracy = 0.88, kappa = 0.77). For predicting SAV cover, the final model consisted of water depth, Secchi depth, percent slope, average fetch, water level, and substrate type; it had moderate accuracy (σ2explained = 0.66, root mean square error = 26.09, and weighted absolute percentage error = 58.96). Both models were then applied spatially using a digital elevation model to predict areas of CP where SAV would likely occur under different water level and water clarity scenarios. We recommend a delisting Secchi depth target of greater than 0.75 m to achieve the maximum potential of SAV areal extent under different water level scenarios.
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Acknowledgements
We would like to express our gratitude to the Royal Botanical Gardens for providing us with the aquatic plant community monitoring data, specifically to Tys Theysmeyer, Jennifer Bowman, Andrea Court and other field staff who monitored Cootes Paradise. We would also like to thank the Hamilton Harbour–Cootes Paradise, Grindstone RAP sub-committee for their guidance and advice on the project. This research was supported by Fisheries and Oceans Canada (DFO) Great Lakes Laboratory of Fisheries and Aquatic Science (GLLFAS) and the Great Lakes Action Plan (GLAP). Special thanks to Dave Reddick, Jackie Dosen, Janet Jardine, Sarah Day and Cheriene Vierra for their help in the project.
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Tang, R.W.K., Doka, S.E., Midwood, J.D. et al. Development and spatial application of a submerged aquatic vegetation model for Cootes Paradise Marsh, Ontario, Canada. Aquat Sci 83, 9 (2021). https://doi.org/10.1007/s00027-020-00760-w
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DOI: https://doi.org/10.1007/s00027-020-00760-w