Abstract
Human-induced rapid environmental change (HIREC) has altered landscape processes and negatively impacted many species globally. Some of the most dramatic changes have been in wetlands where flows have been disrupted, and new wetlands have been created to retain runoff. In response to disrupted natural wetland conditions, Wood Stork (Mycteria americana) populations in South Florida have significantly declined over the past several decades. Despite the well-documented sensitivity of Wood Storks to natural wetland conditions, Wood Storks are often observed foraging in roadside created wetlands; however, the availability of prey in created wetlands is currently unknown. We sampled natural and created wetlands to determine aquatic fauna available for foraging Wood Storks. To determine prey use, we collected food boluses from Wood Storks in both natural wetland and urban landscapes. Historical studies found nonnative fish were absent in Wood Stork diet prior to the dominance of created wetlands in the landscape; however, we found nonnative fish frequently in both created wetlands and boluses. Furthermore, urban nesting Wood Storks consumed large-bodied prey species that were more characteristic of created wetlands whereas Wood Storks nesting in natural wetlands consumed large-bodied prey more characteristic of natural wetlands. Overall, Wood Storks consumed prey that were more similar to the fish community in created wetlands than those in natural wetlands. These dietary patterns suggest that Wood Storks have behavioral plasticity in both foraging habitat and prey use to cope with HIREC. Conservation efforts for species existing in both natural and urban habitats should consider the importance of novel prey and foraging habitats, as they may assist in sustaining populations in a rapidly changing world.
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All data are available upon request.
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Primary analyses were done using a non-code-based software, PRIMER-7. Information on these analyses are available by request.
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Acknowledgements
We are grateful to the many individuals who provided substantial assistance in the field, including Lauren Haag, Jenna May, Carl Santangelo, Victor Benavides, Alissa Gulette, Sarah Staton, Zara Mansoor, and Ashley Jackson. We also thank Wendy Cyriacks and Andrew Gottlieb, for their assistance in project management and field data collection. We are also grateful to Rindy Anderson, Nathan Dorn, Colin Hughes, Kate Shlepr, and two anonymous reviewers for invaluable comments on drafts of this manuscript.
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This research was supported by the Florida Department of Transportation (BDV27-922-02).
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Betsy Evans, Jessica Klassen, and Dale Gawlik designed the study and developed the methods. Betsy Evans and Jessica Klassen collected the data. Betsy Evans analyzed the data and wrote the manuscript. Dale Gawlik and Jessica Klassen provided substantial feedback and edited all versions of the manuscript.
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Research techniques were approved by the Florida Atlantic University Institutional Animal Care and Use Committee (IACUC; Protocol A14-11, A14-28), US Fish and Wildlife Service (TE65550A), Big Cypress National Preserve (BICY-2014-SCI-0014), Everglades National Park (EVER-2014/2016-SCI-0021), Florida Fish and Wildlife Conservation Commission (S-15-02), and the Miccosukee Tribe of Indians of Florida.
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Evans, B.A., Klassen, J.A. & Gawlik, D.E. Dietary flexibility of Wood Storks in response to human-induced rapid environmental change. Urban Ecosyst 25, 705–718 (2022). https://doi.org/10.1007/s11252-021-01181-9
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DOI: https://doi.org/10.1007/s11252-021-01181-9