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Decline of young-of-year walleye (Sander vitreus) growth due to Bythotrephes impacts predicted from bioenergetic principles

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Abstract

Invasive species are a major threat to ecosystem structure and function. For example, Bythotrephes cederströmii (Bythotrephes hereafter) invasions have significantly reduced native zooplankton density and biomass, resulting in competitive interactions with zooplanktivorous fishes. Young of year (YOY) walleye (Sander vitreus) are initially zooplanktivorous and have recently been shown to display reduced growth in Bythotrephes-invaded lakes. Here, we combined a bioenergetics model for larval walleye with changes in the zooplankton community following Bythotrephes invasion and predicted reduced larval walleye growth in the presence of Bythotrephes, supporting field observations. The model predicted greater negative impacts on larval walleye growth in oligotrophic compared with mesotrophic lakes, though reduced growth was only significant under oligotrophic conditions. Under Bythotrephes invasion, net energy available to growth over the simulated period was often observed to be negative (indicating mass loss). These combined results from the model suggest that Bythotrephes invasion could potentially lead to walleye recruitment failure, especially in low nutrient environments. This result was insensitive to differences in annual mean water temperatures ranging from 18.5 to 23.5 °C. As YOY growth, survival, and recruitment are ultimately linked to adult abundance and sustainability of managed stocks, our results highlight the potential impacts of Bythotrephes on the sustainability of walleye populations in boreal lakes.

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Data availability

Lake total phosphorus data are publicly available from The Ontario Biodiversity Council (https://sobr.ca/indicator/water-quality-inland-lakes/) and walleye presence data are available from the Land Information Ontario repository (https://geohub.lio.gov.on.ca/datasets/lio::aquatic-resource-area-survey-point/about). Zooplankton biomass estimates and bioenergetic model output data are available from the Knowledge Network for Biocomplexity (https://knb.ecoinformatics.org/view/urn%3Auuid%3Aea68a408-8a33-4f2d-a0a3-8b0d848d11b6). All other data and parameters used in models are available in the source literature referenced in the body text of the manuscript.

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Acknowledgements

The authors would like to thank Shelley Arnott for providing zooplankton abundance estimates from various lakes in Northern Ontario generated through the Canadian Aquatic Invasive Species Network (CAISN). The authors would also like to thank the Minnesota Department of Natural Resources Large Lakes Monitoring Program for providing zooplankton abundance estimates from various lakes in Northern Minnesota. Comments from two anonymous reviewers helped improve both the readability and scope of the manuscript. This work was supported by grants from the Quetico Foundation, the Rainy Lakes Fishery Trust, NSERC Discovery, the Canada Research Chair program and Lakehead University.

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Both authors contributed to the design and conception of the study. DG preformed data preparation, analysis, and prepared the first draft of the manuscript. MR provided support to automate results generation, provided comments and edits on subsequent versions of the manuscript and approved the final manuscript.

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Correspondence to Danni J. Gartshore.

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Gartshore, D.J., Rennie, M.D. Decline of young-of-year walleye (Sander vitreus) growth due to Bythotrephes impacts predicted from bioenergetic principles. Biol Invasions 25, 2643–2658 (2023). https://doi.org/10.1007/s10530-023-03065-9

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  • DOI: https://doi.org/10.1007/s10530-023-03065-9

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