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What are the competitive effects of invasive species? Forty years of the Eurasian collared-dove in North America

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Abstract

Eurasian collared-doves (Streptopelia decaocto; hereafter ‘collared-doves’) have spread throughout North America since they first colonized Florida in the early 1980s. Here I test for adverse effects of this introduced species on four confamilial potential competitor dove and pigeon species using data from the breeding season (North American Breeding Bird Survey; BBS) and the winter (Audubon Christmas Bird Count; CBC). Within sites of both sets of surveys, correlations between populations of collared-doves and all four potential competitor species have generally been either nonsignificant or positive, indicating a lack of adverse competitive effects due to collared-doves. Similarly, there were no significant differences in population trends of any of the four species in sites where collared-doves were present compared to those where they were not, and there have been no significant declines in population trends of the four species driven by differences in collared-dove abundance in areas where the latter were present. Overall, analyses revealed no negative effects of collared-doves on populations of these potential competitors. Evidence thus far supports a ‘passenger’ rather than a ‘driver’ role for collared-doves in North America, although future monitoring of potential competitor species is warranted, especially if collared-dove populations continue to increase.

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Acknowledgements

We thank the reviewers for their comments, Janis Dickinson for discussion, and Kathy Dale for access to the Audubon Christmas Bird Count data.

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Correspondence to Walter D. Koenig.

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Koenig, W.D. What are the competitive effects of invasive species? Forty years of the Eurasian collared-dove in North America. Biol Invasions 22, 3645–3652 (2020). https://doi.org/10.1007/s10530-020-02350-1

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  • DOI: https://doi.org/10.1007/s10530-020-02350-1

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