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Spatio-temporal patterns of occupation and density by an invasive fish in streams

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Abstract

Since its introduction to North America in the 1990s, the round goby has spread throughout the Great Lakes and inland movement into small tributaries, a new environment for this species in both its native and invaded ranges, is becoming more prevalent. We assessed spatial and temporal occupation of round gobies in four small streams in two systems in south-central Ontario, Canada to determine which habitat variables are the best predictors of round goby density. Two streams are tributaries of Lake Ontario and two are tributaries of the Otonabee River; all of these streams have barriers preventing upstream migration. Occupation and density patterns differed between the systems. In the Lake Ontario system, density was highest near the longitudinal centre of the stream between the mouth and first barrier, and round goby appeared to occupy these streams mainly from spring to fall. In the Otonabee River system, round goby occupied the streams year-round, and the most important factor determining adult density was distance from a barrier to upstream movement, with density highest next to the barriers. Adult density in Lake Ontario tributaries was highest in sites with a high percentage of cobble/boulder and a low percentage of gravel substrate, while substrate was less important in Otonabee River tributaries. Date was the strongest predictor of juvenile density, with density increasing through the sampling period in both systems. Occupation and density patterns may differ due to contrasting environmental conditions in the source environments and distance to the first barrier preventing upstream movement. This study shows diversity in invasion strategies, and provides insight into the ability of invasive species to change their occupation strategies based on the different environments they encounter.

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Acknowledgements

This project was supported by a National Science and Engineering Council Discovery Grant to MGF. Electrofishing and fish handling procedures used in this study were approved by the Trent University Animal Care Committee (Protocol #24435). We thank S. MacDonald and S. Blair for field assistance, and L. Gutowsky for statistical advice. This manuscript was greatly improved by helpful comments provided by D. Beresford, M. Kornis and an anonymous reviewer on an earlier version of this manuscript.

Funding

This study was financially supported by National Science and Engineering Research Council Grant (46681) to M. G. Fox.

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Correspondence to Michael G. Fox.

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Appendix

Appendix

See Tables 7, 8, 9, 10, 11 and 12.

Table 7 Lake Ontario tributaries correlation matrix for explanatory variables, where Spearman Rank correlation coefficient ≥ |0.5| indicates significant correlation and the variables will not be used in the same model
Table 8 Otonabee River tributaries correlation matrix for explanatory variables where Spearman Rank correlation coefficient ≥ |0.5| indicates significant correlation and the variables will not be used in the same model
Table 9 Top ten models describing adult round goby density in Otonabee River tributaries using Akaike’s Information Criterion corrected for small sample size (AICc)
Table 10 Top ten models describing juvenile round goby density in Otonabee River tributaries using Akaike’s Information Criterion corrected for small sample size (AICc)
Table 11 Top ten models describing adult round goby density in Lake Ontario tributaries using Akaike’s Information Criterion corrected for small sample size (AICc)
Table 12 Top ten models describing juvenile round goby density in Lake Ontario tributaries using Akaike’s Information Criterion corrected for small sample size (AICc)

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May, C., Burness, G., Morrison, B. et al. Spatio-temporal patterns of occupation and density by an invasive fish in streams. Biol Invasions 22, 2143–2161 (2020). https://doi.org/10.1007/s10530-020-02243-3

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  • DOI: https://doi.org/10.1007/s10530-020-02243-3

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