Abstract
Prey selection was investigated in wild, resident common bottlenose dolphins, Tursiops truncatus, during the summer months in Sarasota Bay, Florida, USA. Stomach content analyses of 15 dolphins with extensive sighting histories and well-documented distributions were used to determine prey use. Prey availability was assessed by purse seine surveys. We compared the relative abundances of prey available to estimates of prey use at closely matching spatial and temporal scales. G-tests determined that dolphins in this study significantly selected for prey at the species, family, and soniferous/non-soniferous prey levels (G adj = 753.98–1,775.93, df = 1–21, p ≤ 0.01). While comprising only 6.3% of the total available prey, soniferous fishes accounted for 51.9% of the total prey consumed. Manly’s standardized forage ratios and 95% Bonferroni confidence intervals determined significant positive selection for soniferous prey and against non-soniferous prey (βS = 0.9461 vs. βNS = 0.0539). Dolphins selected against Gerridae, Clupeidae, and Sparidae (β ≤ 0.0014), as well as against all the species within those families (β ≤ 0.0190). It is likely that passive listening for soniferous prey provides an ecological or energetic advantage to cetaceans utilizing this specific foraging technique.
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Acknowledgments
We thank the many Mote Marine Laboratory and Chicago Zoological Society staff members, interns, and volunteers who made this work possible by providing logistical support and assistance in the field. Lewis Woods and Larry Fulford were instrumental in establishing our purse seining program. We especially thank Sandy Camilleri, Katie Brueggen, Aaron Barleycorn, and all members of Mote Marine Laboratory’s Stranding Investigations Program staff who provided much needed help in the field. Janet Gannon provided a custom GIS sampling program and prey sampling database. We would like to thank NOAA’s fisheries service (Grant Award Number NA16FL1355) for the primary funding for this project. Harbor Branch Oceanographic Institution’s Protect Wild Dolphins Program (grant numbers PWD 2004-18 and PWD 2005-09) and Florida’s State Wildlife Grants Program (SWG05_028) provided additional funding. This research was authorized by the Florida Fish and Wildlife Conservation Commission (Special Activity License numbers 03SR-809 and 04SR-809), NOAA Fisheries Service (STRANDING LOA), and Mote Marine Laboratory’s Institutional Animal Care and Use Committee (protocol numbers 06-10-DG1 and 07-10-DG1).
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Communicated by S. Garthe.
An erratum to this article can be found at http://dx.doi.org/10.1007/s00227-009-1385-9
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Berens McCabe, E.J., Gannon, D.P., Barros, N.B. et al. Prey selection by resident common bottlenose dolphins (tursiops truncatus) in Sarasota Bay, Florida. Mar Biol 157, 931–942 (2010). https://doi.org/10.1007/s00227-009-1371-2
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DOI: https://doi.org/10.1007/s00227-009-1371-2