Geographic position and landscape composition explain regional patterns of migrating landbird distributions during spring stopover along the northern coast of the Gulf of Mexico
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Annual migration of landbirds across the Gulf of Mexico (GOM) presents a unique opportunity to examine extrinsic processes operating at various spatial scales in determining animal distributions.
Our objectives were to comprehensively quantify bird stopover densities across the northern GOM coast and model broad-scale factors explaining distributional patterns.
We used weather surveillance radars to measure reflectivity of birds aloft at onset of nocturnal migratory flights and estimate bird stopover densities during four springs (2009–2012) for 6.7 million ha along the GOM. We aggregated bird densities to one longitudinal degree and 3 km of proximity to coast.
Boosted Regression Tree models revealed that stopover density was related to year, longitude, proximity to coast, and amount of hardwood forest cover in the landscape. Average longitudinal patterns supported previous studies of broad-scale trans-Gulf migrant arrivals with highest density in Louisiana (92–93°W) and lowest in Alabama (88–89°W). Florida (83–84°W) supported a second peak in migrant density, suggesting an eastern trans-Gulf route or contribution from trans-Caribbean migrants. Longitudinal patterns in migrant distributions varied strongly between years and appear generally related to variability in GOM wind patterns. Densities increased with proximity to coast, highlighting constraints on migrants to travel inland, especially in Florida’s panhandle. Despite this, density was positively related to amount of forest cover more steeply along the immediate coast.
Broad-scale stopover distributions of migrating landbirds along the GOM coast are heavily influenced by geographic constraints in the context of the GOM acting as a barrier to landbird migration.
Keywords(10 max) Bird migration Gulf of Mexico Hierarchical distribution patterns Weather radar
We thank Jaclyn Smolinsky for assistance with radar data processing. Funding to support this research was awarded in part by a grant from the USGS Science Support Partnership Program and provided in part by the University of Southern Mississippi. We acknowledge and are grateful for the support of the USGS Gulf Coast Joint Venture and constructive comments from two anonymous reviewers.
- Abdollahi KK, Ning ZH, Stubblefield M (2005) Urban forest ecosystem structure and the function of the gulf coastal communities in the United States. WIT Trans Ecol Environm. Ecosyst Sustain Dev V Vol 81: 605–614Google Scholar
- Able KP (1972) Fall migration in coastal Louisiana and the evolution of migration patterns in the Gulf region. Wilson Bull 84:231–242Google Scholar
- Barrow WC, Johnson Randall LA, Woodrey MS, Cox J, Ruelas E, Riley CM, Hamilton RB, Eberly C (2005) Coastal forests of the Gulf of Mexico: a description and some thoughts on their conservation. USDA Forest Service General Technical Report PSW-GTR-191Google Scholar
- Buler JJ, Moore FR, Woltmann S (2007) A multi-scale examination of stopover habitat use by birds. Ecology (Washington D. C.) 88:1789–1802Google Scholar
- Buskirk WH (1980) Influence of meteorological patterns and trans-Gulf migration on the calendars of latitudinal migrants. In: Keast A, Morton E (eds) Migrant birds in the Neotropics. Smithsonian Press, Washington, DC, pp 485–491Google Scholar
- Cooke WW (1904) Distribution and migration of North American warblers. U.S. Department of Agriculture. Bulletin No. 18Google Scholar
- Deppe J, Ward MP, Bolus RT, Diehl RH, Celis-Murillo A, Zenzal TJ, Moore FR, Benson TJ, Smolinsky JA, Schofield LN, Enstrom DA, Paxton EH, Bohrer G, Beveroth TA, Raim A, Obringer RL, Delaney D, Cochran WW (2015) Fat, weather, and date affect migratory songbirds' departure decisions, routes, and time it takes to cross the Gulf of Mexico. Proc Natl Acad Sci USA 112(46):E6331–E6338Google Scholar
- Fraser KC, Silverio C, Kramer P, Mickle N, Aeppli R, Stutchbury BJ (2013) A trans-hemispheric migratory songbird does not advance spring schedules or increase migration rate in response to record-setting temperatures at breeding bites. PLoS ONE 8(5):e64587. doi: 10.1371/journal.pone.0064587 CrossRefPubMedPubMedCentralGoogle Scholar
- Gauthreaux SA (1975) Coastal hiatus of spring trans-Gulf bird migration. A rationale for determining Louisiana’s coastal zone. Louisiana State University, Center for Wetland Resources, Coastal Zone Management Series report no. 1, pp 85–91Google Scholar
- Gauthreaux SA (1999) Neotropical migrants and the Gulf of Mexico: The view from aloft. In: Able KP (ed) A gathering of angels: the ecology and conservation of migrating birds. Cornell University Press, IthacaGoogle Scholar
- Gauthreaux SA, Michi JE, Belser CG (2005) The temporal and spatial structure of the atmosphere and its influence on bird migration strategies. Birds of two worlds. Smithsonian Institution, Washington, D. C., pp 182–196Google Scholar
- Hijmans RJ, Phillips S, Leathwick JR, Elith J (2015) Dismo: species distribution modeling. R package version 1.0-12. http://CRAN.R-project.org/package=dismo
- Homer CG, Dewitz JA, Yang L, Jin S, Danielson P, Xian G, Coulston J, Herold ND, Wickham JD, Megown K (2015) Completion of the 2011 National Land Cover Database for the conterminous United States-Representing a decade of land cover change information. Photogramm Eng Remote Sens 81(5):345–354Google Scholar
- Moore FR (ed) (2000) Stopover Ecology of Neartic-Neotropical Landbird Migrants: Habitat Relations and Conservation Implications. Stud in Avian Biol No. 20Google Scholar
- Moore FR, Gauthreaux SA, Kerlinger P, Simons TR (1995) Habitat requirements during migration: important link in the conservation of neotropical landbird migrants. In: Martin T, Finch D (eds) Ecology and management of neotropical migratory birds. Oxford University Press, New York, pp 121–144Google Scholar
- Moore FR, Kerlinger P (1989) Atmospheric structure and avian migration. Curr Ornithol 6:109–142Google Scholar
- Moore FR, Kerlinger P, Simons TR (1990) Stopover on a Gulf Coast barrier island by spring trans-gulf migrants. Wilson Bull 102:487–500Google Scholar
- Moore FR, Woodrey MS, Buler JJ, Woltmann S, Simons TR (2005) Understanding the stopover of migratory birds: A scale dependent approach. In: Ralph CJ and Rich TD (eds) Bird Conservation Implementation and Integration in the Americas: Proceedings of the third international partners in flight conference 2002. U.S.D.A. Forest Service, GTR-PSW-191, Albany, CA, pp 684–689Google Scholar
- Murray D, McWhirter J, Wier S, Emmerson S (2003) The integrated data viewer: a web-enabled application for scientific analysis and visualization. Preprints, 19th International conference on IIPS for meteorology, oceanography and hydrologyGoogle Scholar
- Newton I (2008) The migration ecology of birds. Academic Press, LondonGoogle Scholar
- Putnam JA, Furnival GM, McKnight JS (1960) Management and inventory of southern hardwoods. U.S. Department of Agriculture Handbook 181Google Scholar
- Russell RW (2005) Interactions between migrating birds and offshore oil and gas platforms in the northern Gulf of Mexico: Final Report. U.S. Department of the Interior, Minerals Management Service, Gulf of Mexico OCS Region, New Orleans, LA. OCS Study MMS 2005-009Google Scholar
- Yong W, Moore FR (1997) Spring stopover of intercontinental migratory thrushes along the northern coast of the Gulf of Mexico. Auk 114(2):263–278Google Scholar