Seasonal survival estimation for a long-distance migratory bird and the influence of winter precipitation
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Conservation of migratory animals requires information about seasonal survival rates. Identifying factors that limit populations, and the portions of the annual cycle in which they occur, are critical for recognizing and reducing potential threats. However, such data are lacking for virtually all migratory taxa. We investigated patterns and environmental correlates of annual, oversummer, overwinter, and migratory survival for adult male Kirtland’s warblers (Setophaga kirtlandii), an endangered, long-distance migratory songbird. We used Cormack–Jolly–Seber models to analyze two mark–recapture datasets: 2006–2011 on Michigan breeding grounds, and 2003–2010 on Bahamian wintering grounds. The mean annual survival probability was 0.58 ± 0.12 SE. Monthly survival probabilities during the summer and winter stationary periods were relatively high (0.963 ± 0.005 SE and 0.977 ± 0.002 SE, respectively). Monthly survival probability during migratory periods was substantially lower (0.879 ± 0.05 SE), accounting for ~44% of all annual mortality. March rainfall in the Bahamas was the best-supported predictor of annual survival probability and was positively correlated with apparent annual survival in the subsequent year, suggesting that the effects of winter precipitation carried over to influence survival probability of individuals in later seasons. Projection modeling revealed that a decrease in Bahamas March rainfall >12.4% from its current mean could result in negative population growth in this species. Collectively, our results suggest that increased drought during the non-breeding season, which is predicted to occur under multiple climate change scenarios, could have important consequences on the annual survival and population growth rate of Kirtland’s warbler and other Neotropical–Nearctic migratory bird species.
KeywordsAnnual survival Carryover effects Kirtland’s warbler Non-breeding season Population growth
We thank the two anonymous reviewers whose comments substantially improved this manuscript. This research was completed with approval from the Kirtland’s Warbler Recovery Team and the IACUCs of the University of Maryland and Smithsonian National Zoological Park. All applicable institutional and/or national guidelines for the care and use of animals were followed. The Michigan portion of this research was supported by the American Ornithologists’ Union, Cooper Ornithological Society, Manomet Center for Conservation Science, Smithsonian Institution, University of Maryland, U.S. Fish and Wildlife Service, and USDA Forest Service. We thank 15 enthusiastic field assistants for their hard work at Michigan study sites. We are grateful to C. Studds and J. Hostetler for assistance with fieldwork and statistics, respectively. We additionally thank the dedicated team of eight Bahamian student interns and ten field assistants who carried out field work on Eleuthera, as well as E. Carey of the Bahamas National Trust. We greatly appreciate the local support provided by Bahamian landowners and commonage committees for permitting access to their lands. Funding for Eleuthera work was provided by International Programs of the USDA Forest Service, The Nature Conservancy, and the Puerto Rican Conservation Foundation, working in cooperation with the Bahamas National Trust, the College of the Bahamas, and the University of Puerto Rico. The National Climatic Data Center of the National Oceanic and Atmospheric Association is available online at http://www.ncdc.noaa.gov/IPS/mcdw/mcdw.html.
Author contribution statement
SMR, PPM, TSS formulated the idea. SMR, PPM, JMW, CIB developed the methodology. SMR, JMW, DC, JDW, DNE performed the field work. SMR and TSS analyzed the data. SMR and all other authors prepared the manuscript.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest other than the funding sources listed in “Acknowledgments”.
- Baillie SR, Peach WJ (1992) Population limitation in Palearctic-African migrant passerines. Ibis 134(Suppl):120–132Google Scholar
- Bocetti CI (1994) Density, demography, and mating success of Kirtland’s warblers in managed and natural habitats. Ph.D. dissertation, Department of Evolution, Ecology and Organismal Biology, Ohio State University, Columbus, Ohio, USAGoogle Scholar
- Bocetti CI, Probst JR, Huber P (2002) Report to Regional Director to request modification to recovery goal. U.S. Department of Interior, Fish and Wildlife Service Region 3, Minneapolis, Minnesota, USAGoogle Scholar
- Burnham KP, Anderson DR (2002) Model selection and multi-model inference: a practical information-theoretic approach, 2nd edn. Spring-Verlag New York Inc, New YorkGoogle Scholar
- Calvert AM, Walde SJ, Taylor PD (2009) Non-breeding season drivers of population dynamics in seasonal migrants: conservation parallels across taxa. Avian Conserv Ecol 4 [online]. http://www.ace-eco.org/vol4/iss2/art5
- Faaborg J, Holmes RT, Anders AD, Bildstein KL, Dugger KM, Gauthreaux SA, Heglund P, Hobson KA, Jahn AE, Johnson DH, Latta SC, Levey DJ, Marra PP, Merkord CL, Nol E, Rothstein SI, Sherry TW, Sillett TS, Thompson FR, Warnock N (2010) Recent advances in understanding migration systems of New World land birds. Ecol Monogr 80:3–48CrossRefGoogle Scholar
- Fretwell SD (1972) Populations in a seasonal environment. Princeton University Press, PrincetonGoogle Scholar
- Hedenström A, Bowlin MS, Nathan R, Nolet BA, Wikleski M (2011) Mechanistic principles of locomotion performance in migrating animals. In: Milner-Gulland EJ, Fryxell JM, Sinclair ARE (eds) Animal migration: a synthesis. Oxford University Press, Oxford, pp 35–51Google Scholar
- Holmes RT, Rodenhouse NL, Sillett TS (2005) Black-throated Blue Warbler (Setophaga careluscens). In: Poole A (ed) The birds of North America online. Cornell Lab of Ornithology, IthacaGoogle Scholar
- Kelly ST, DeCapita ME (1982) Cowbird control and its effect on Kirtland’s Warbler reproductive success. Wilson Bull 94:363–365Google Scholar
- Martin HC, Weech PS (2001) Climate change in the Bahamas? Evidence from the meteorological records. Bahamas J Sci 5:22–32Google Scholar
- Mayfield HF (1960) The Kirtland’s Warbler. Cranbook Institute of Science, Bloomfield HillsGoogle Scholar
- Mayfield HF (1992) Kirtland’s Warbler (Setophaga kirtlandii). In: Poole A (ed) The birds of North America online. Cornell Lab of Ornithology, IthacaGoogle Scholar
- Petrucha ME, Sykes PW Jr, Huber PW, Duncan WW (2013) Spring and fall migrations of Kirtland’s Warbler (Setophaga kirtlandii). N Am Birds 66:382–427Google Scholar
- Sealey NE (2006) Bahamian landscapes: an introduction to the geology and physical geography of the Bahamas, 3rd edn. Macmillan Publishers Ltd, NassauGoogle Scholar
- Seber GAF (1982) The estimation of animal abundance and related parameters, 2nd edn. Charles Griffin and Company Ltd, LondonGoogle Scholar
- Seebacher F, Post E (2015) Climate change impacts on animal migration. Clim Ch Responses 2:5. [online] doi: 10.1186/s40665-015-0013-9
- Sherry TW, Holmes RT (1995) Summer versus winter limitation of populations: what are the issues and what is the evidence? In: Martin TE, Finch DM (eds) Ecology and management of Neotropical migratory birds. Oxford University Press, Oxford, pp 85–120Google Scholar
- Sykes PW, Clench MH (1998) Winter habitat of Kirtland’s Warbler: an endangered Nearctic/Neotropical migrant. Wilson Bull 110:244–261Google Scholar
- U. S. Fish and Wildlife Service (USFWS) (2016) Kirtland’s Warbler Census Results. [online] http://www.fws.gov/midwest/Endangered/birds/Kirtland/Kwpop.html
- Walkinshaw L (1983) Kirtland’s Warbler: the natural history of an endangered species. Cranbrook Institute of Science, Bloomfield HillsGoogle Scholar
- Wunderle JM Jr, Lebow PK, White JD, Currie D, Ewert DN (2014) Sex and age differences in site fidelity, food resource tracking, and body condition of wintering Kirtland’s Warblers in the Bahamas. Orn Monogr 80:1–62Google Scholar