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1. Walsh, J., W. G. Shriver, B. J. Olsen, K. M. O'Brien, and A. I. Kovach. (2015). Relationship of phenotypic variation and genetic admixture in the Saltmarsh-Nelson's sparrow hybrid zone. Auk 132 (3):704-716. doi: 10.1642/auk-14-299.1. https://doi.org/10.1642/auk-14-299.1
2. Pyle, P., and D. A. Sibley (1992). Juvenal-plumaged Le Conte's Sparrows on migration: Are they being overlooked? Birding 24:70-76.
3. Sibley, D. 1996. Field identification of the sharp-tailed sparrow complex. Birding 28 (3):196-208.
4. Pyle, P. (1997). Identification Guide to North American Birds, Part I: Columbidae to Ploceidae. Slate Creek Press, Bolinas, CA, USA.
5. Dwight, J., Jr. (1900). The sequence of plumages and moults of the passerine birds of New York. Annals of the New York Academy of Sciences 13:73–360.
6. Ridgway, R. (1901). The birds of North and Middle America, Part 1. United States National Museum Bulletin 50.
7. Woolfenden, G. E. (1968). "Ammospiza maritima maritima (Wilson) Northern Seaside Sparrow." In Life histories of North American cardinals, buntings, towhees, finches, sparrows, and their allies, Parts 1-3, edited by O. L. Austin, 819-831. U.S. National Museum Bulletin No. 237.
8. Byers, C., J. Curson, and J. Olsson. (1995). Sparrows and Buntings: A Guide to the Sparrows and Buntings of North America and the World. Houghton Mifflin Company, New York, USA.
9. Rising, J. D. (1996). A Guide to the Identification and Natural History of the Sparrows of the United States and Canada. Academic Press, NY, USA.
10. Woolfenden, G. E. 1956. Comparative breeding behavior of Ammospiza caudacuta and A. maritima. Univ. Kansas Publ. Mus. Nat. Hist. 10 (2):45-75.
11. Humphrey, P. S., and K. C. Parkes (1959). An approach to the study of molts and plumages. Auk 76:1–31.
12. Howell, S. N. G., C. Corben, P. Pyle, and D. I. Rogers (2003). The first basic problem: A review of molt and plumage homologies. Condor 105:635–653.
13. Wayne, A. T. (1921). Albinism in the Sharp-tailed Sparrow (Passerherbulus caudacutus). Auk 38:604-605.
14. Enders, F. and W. Post. (1971). White-spotting in the genus Ammospiza and other grassland sparrows. Bird-Banding 42:210-219.
15. Pyle, P., and M. McPherson (2017). Why so many white Eared Grebes? Birding 49:58-65. http://www.birdpop.org/docs/pubs/Pyle_and_McPherson_2017_Why_So_Many_White_Eared_Grebes.pdf
16. Wayne, A. T. 1924. Albinism in Sharp-tailed Sparrow. Auk 41:346-347.
17. Ross, C. C. (1963). Albinism among North American birds. Cassinia 47:2–21.
18. Howell, S. N. G., C. Corben, P. Pyle, and D. I. Rogers (2004). The first basic problem revisited: Reply to commentaries on Howell et al. (2003). Condor 106:206–210.
19. Howell, S. N. G. (2010). Peterson Reference Guide to Molt in North American Birds. Houghton Mifflin Harcourt Company, Boston, MA, USA.
20. Stone, W. (1896). The molting of birds with special reference to the plumages of smaller land birds of eastern North America. Proceedings of the Academy of Natural Sciences of Philadelphia 43:108–164.
21. Chapman, F. M. 1910. Notes on the plumage of North American sparrows. Bird-Lore 12:16-18.
22. Forbush, E. H. (1929). Birds of Massachusetts and Other New England States, Part 3: Land Birds from Sparrows to Thrushes. Massachusetts Department of Agriculture, Boston, MA, USA.
23. Tordoff, H. B., and R. M. Mengel (1951). The occurrence and possible significance of a spring molt in Le Conte's Sparrow. Auk 68:519-522.
24. Pyle, P. (1997). Molt limits in North American passerines. North American Bird Bander 22:49–89.
25. Walsh, J., I. J. Lovette, V. Winder, C. S. Elphick, B. J. Olsen, G. Shriver, and A. I. Kovach. (2017). Subspecies delineation amid phenotypic, geographic and genetic discordance in a songbird. Molecular Ecology 26 (5):1242-1255. doi: 10.1111/mec.14010. https://doi.org/10.1111/mec.14010
26. Borowske, A. C. (2015). Effects of life history strategies on annual events and processes in the lives of tidal marsh sparrows. Ph.D. dissertation, University of Connecticut, Storrs, CT.
27. Montagna, W. (1942). The Sharp-tailed Sparrows of the Atlantic coast. Wilson Bulletin 54:107-120.
28. Post, W. and J. S. Greenlaw. (2009). Seaside Sparrow (Ammodramus maritimus), version 2.0. In The Birds of North America (P. G. Rodewald, editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bna.127
29. Greenberg, R. (2006). Tidal marshes: Home for the few and the highly selected. Pp. 2-9 In Terrestrial Vertebrates of Tidal Marshes: Evolution, Ecology, and Conservation (R. Greenberg, J. E. Maldonado, S. Droege, and M. V. McDonald, Eds.). Studies in Avian Biology, no. 32.
30. Benoit, L. K. and R. A. Askins. (2002). Relationship between habitat area and the distribution of tidal marsh birds. Wilson Bulletin 114 (3):314-323.
31. Hill, C. E., S. Tomko, C. Hagen, N. A. Schable, and T. C. Glenn. (2008). Novel microsatellite markers for the Saltmarsh Sharp-tailed Sparrow, Ammodramus caudacutus (Aves: Passeriformes). Molecular Ecology Resources 8 (1):113-115. doi: 10.1111/j.1471-8286.2007.01885.x. https://doi.org/10.1111/j.1471-8286.2007.01885.x
32. Walsh, J., A. I. Kovach, K. J. Babbitt, and K. M. O'Brien. (2012). Fine-scale population structure and asymmetrical dispersal in an obligate salt-marsh passerine, the Saltmarsh Sparrow (Ammodramus caudacutus). Auk 129 (2):247-258. doi: 10.1525/auk.2012.11153. https://doi.org/10.1525/auk.2012.11153
33. Pennant, T. (1785). Arctic zoology. Vol. II. London, England: Henry Hughs.
34. Latham, J. (1782). A general synopsis of birds. Vol. 1 (2). London: Printed for Benj. White.
35. Dwight, Jr., J. (1896). The Sharp-tailed Sparrow (Ammodramus caudacutus) and its geographical races. Auk 13:271-278.
36. Greenlaw, J. S. (2008). Saltmarsh Sharp-tailed Sparrow, Ammodramus caudacutus. In The Second Atlas of Breeding Birds in New York State (K. J. McGowan and K. Corwin, Eds.). Cornell University Press, Ithaca NY, pp. 560-561.
37. Dettmers, R., and K. V. Rosenberg. (2000). Partners in Flight bird conservation plan for the southern New England (physiographic area 09), version 1.0. American Bird Conservancy, Washington, DC.
38. DiQuinzio, D. A., P. W. C. Paton, and W. R. Eddleman. (2001). Site fidelity, philopatry, and survival of promiscuous Saltmarsh Sharp-tailed Sparrows in Rhode Island. Auk 118 (4):888-899. doi: 10.1642/0004-8038(2001)118[0888:sfpaso]2.0.co;2. https://doi.org/10.1642/0004-8038(2001)118[0888:sfpaso]2.0.co;2
39. Gjerdrum, C., C. S. Elphick, and M. A. Rubega. (2008). How well can we model numbers and productivity of Saltmarsh Sharp-tailed Sparrows (Ammodramus caudacutus) using habitat features? Auk 125 (3):608-617. doi: 10.1525/auk.2008.07029. https://doi.org/10.1525/auk.2008.07029
40. Bayard, T. S., and C. S. Elphick. (2010). Using spatial point-pattern assessment to understand the social and environmental mechanisms that drive avian habitat selection. Auk 127 (3):485-494. doi: 10.1525/auk.2010.09089. https://doi.org/10.1525/auk.2010.09089
41. Wiest, W. A., M. D. Correll, B. J. Olsen, C. S. Elphick, T. P. Hodgman, D. R. Curson, and W. G. Shriver. (2016). Population estimates for tidal marsh birds of high conservation concern in the northeastern USA from a design-based survey. Condor 118 (2):274-288. doi: 10.1650/condor-15-30.1. https://doi.org/10.1650/condor-15-30.1
42. Bishop, L. B. (1901). A new Sharp-tailed Finch from North Carolina. Auk 18:269-270.
43. Wetmore, A. (1944). Records of Sharp-tailed Sparrows from Maryland and Virginia in the National Museum. Auk 61 (1):132-133.
44. Montagna, W. (1942). Additional notes on the Atlantic coast Sharp-tailed Sparrows. Wilson Bulletin 54:256.
45. American Ornithologists' Union (1998). Check-list of North American Birds, 7th edition. American Ornithologists' Union, Washington, DC, USA.
46. Roberts, S. G., R. A. Longenecker, M. A. Etterson, K. J. Ruskin, C. S. Elphick, B. J. Olsen, and W. G. Shriver. (2017). Factors that influence vital rates of Seaside and Saltmarsh sparrows in coastal New Jersey, USA. Journal of Field Ornithology 88 (2):115-131. doi: 10.1111/jofo.12199. https://doi.org/10.1111/jofo.12199
47. Greenlaw, J. S. and G. E. Woolfenden. (2007). Wintering distributions and migration of Saltmarsh and Nelson's sharp-tailed sparrows. Wilson Journal of Ornithology 119 (3):361-377.
48. Rising, J. D. and J. Avise. (1993). An application of genealogical concordance principles to the taxonomy and evolutionary history of the Sharp-tailed Sparrow (Ammodramus caudacutus). Auk 110:844-856.
49. Greenlaw, J. S. (1993). Behavioral and morphological diversification in Sharp-tailed Sparrows (Ammodramus caudacutus) of the Atlantic coast. Auk 110 (2):286-303.
50. Klicka, J., and G. M. Spellman (2007). A molecular evaluation of the North American "grassland" sparrow clade. Auk 124:537–551.
51. Zink, R. M., and J. C. Avise (1990). Patterns of mitochondrial DNA and allozyme evolution in the avian genus Ammodramus. Systematic Zoology 39:148-161.
52. Klicka, J., F. K. Barker, K. J. Burns, S. M. Lanyon, I. J. Lovette, J. A. Chaves and Jr. Bryson, R. W. (2014). A comprehensive multilocus assessment of sparrow (Aves: Passerellidae) relationships. Molecular Phylogenetics and Evolution 77:177-182.
53. Murray, B. G., Jr. 1968. The relationships of sparrows in the genera Ammodramus, Passerherbulus, and Ammospiza, with a description of a hybrid Le Conte's x Sharp-tailed Sparrow. Auk 85:586-593.
54. Oberholser, H. C. 1917. Notes on the fringilline genus Passerherbulus and its nearest allies. Ohio Journal of Science 17:332-336.
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61. Norton, A. H. (1897). The Sharp-tailed Sparrows of Maine, with remarks on their distribution and relationship. Portland Soc. Nat. Hist. 2:97-102.
62. American Ornithologists' Union (1995). Fortieth supplement to the American Ornithologists' Union Check-list of North American Birds. Auk 112:819-830.
63. Chesser, R. T., K. J. Burns, C. Cicero, J. L. Dunn, A. W. Kratter, I. J. Lovette, P. C. Rasmussen, J. V. Remsen Jr., D. F. Stotz, B. M. Winger, and K. Winker (2018). Fifty-ninth supplement to the American Ornithological Society's Check-list of North American Birds. Auk 135:798–813. https://doi.org/10.1642/auk-18-62.1
64. Hodgman, T. P., W. G. Shriver and P. D. Vickery. (2002). Redefining range overlap between the Sharp-tailed Sparrows of coastal New England. Wilson Bulletin 114 (1):38-43.
65. Walsh, J., A. I. Kovach, O. P. Lane, K. M. O'Brien, and K. J. Babbitt. (2011). Genetic barcode RFLP analysis of the Nelson’s and Saltmarsh sparrow hybrid zone. Wilson Journal of Ornithology 123 (2):316-322. doi: 10.1676/10-134.1. https://doi.org/10.1676/10-134.1
66. Shriver, W. G., J. P. Gibbs, P. D. Vickery, H. L. Gibbs, T. P. Hodgman, P. T. Jones and C. N. Jacques. 2005. Concordance between morphological and molecular markers in assessing hybridization between sharp-tailed sparrows in New England. Auk 122 (1):94-107.
67. Walsh, J., B. J. Olsen, K. J. Ruskin, W. G. Shriver, K. M. O'Brien, and A. I. Kovach. (2016). Extrinsic and intrinsic factors influence fitness in an avian hybrid zone. Biological Journal of the Linnean Society 119 (4):890-903. doi: 10.1111/bij.12837. https://doi.org/10.1111/bij.12837
68. Walsh, J., R. J. Rowe, B. J. Olsen, W. G. Shriver, and A. I. Kovach. (2016). Genotype-environment associations support a mosaic hybrid zone between two tidal marsh birds. Ecology and Evolution 6 (1):279-294. doi: 10.1002/ece3.1864. https://doi.org/10.1002/ece3.1864
69. Norton, A. H. (1904). Notes on the finches found in Maine. Journal of Maine Ornithological Society 6:42-47, 53-57.
70. Montagna, W. (1940). The Acadian Sharp-tailed Sparrows of Popham Beach, Maine. Wilson Bulletin 52:191-197.
71. Palmer, R. S. (1949). Maine Birds. Bulletin of the Museum of Comparative Zoology, Harvard University 102:1–579.
72. Brown, N. C. (1880). Ammodromus [sic] caudacutus a summer resident in southern Maine. Bulletin of the Nuttall Ornithological Club 5:52.
73. Walsh, J., W. G. Shriver, M. D. Correll, B. J. Olsen, C. S. Elphick, T. P. Hodgman, R. J. Rowe, K. M. O'Brien, and A. I. Kovach. (2017). Temporal shifts in the saltmarsh-Nelson's sparrow hybrid zone revealed by replicated demographic and genetic surveys. Conservation Genetics 18 (2):453-466. doi: 10.1007/s10592-016-0920-8. https://doi.org/10.1007/s10592-016-0920-8
74. Correll, M. D., W. A. Wiest, T. P. Hodgman, W. G. Shriver, C. S. Elphick, B. J. McGill, K. M. O'Brien, and B. J. Olsen. (2017). Predictors of specialist avifaunal decline in coastal marshes. Conservation Biology 31 (1):172-182. doi: 10.1111/cobi.12797. https://doi.org/10.1111/cobi.12797
75. Walsh, J., L. M. Maxwell, and A. I. Kovach (2018). The role of divergent mating strategies, reproductive success, and compatibility in maintaining the Saltmarsh–Nelson’s sparrow hybrid zone. Auk 135:693-705. https://doi.org/10.1642/AUK-17-218.1
76. Sage, J. H., L. B. Bishop and W. P. Bliss. (1913). The birds of Connecticut. Hartford, CN: Bull. no. 20, Connecticut Geol. and Nat. Hist. Surv.
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78. Beecher, W. J. (1955). Late Pleistocene isolation in salt-marsh sparrows. Ecology 36 (1):23-28.
79. Greenberg, R., C. S. Elphick, J. C. Nordby, C. Gjerdrum, H. Spautz, G. Shriver, B. Schmeling, B. Olsen, P. Marra, N. Nur, and M. Winter (2006). Flooding and predation: Trade-offs in the nesting ecology of tidal-marsh sparrows. Studies in Avian Biology (32):96-109.
80. Trollinger, J. B., and K. K. Reay. (2001). Breeding bird atlas of Virginia, 1985-1989. Special Publication no. 3, The Virginia Society of Ornithology.
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82. O’Brian, M. (1996). Saltmarsh Sharp-tailed Sparrow (Ammodramus caudacutus). In Atlas of the breeding birds of Maryland and the District of Columbia (C. S. Robbins, ed.). University of Pittsburgh Press, Pittsburgh, PA. pp. 402-403.
83. Davidson, L. M. (2010). Saltmarsh Sparrow (Ammodramus caudacutus). In 2nd Atlas of the Breeding Birds of Maryland and the District of Columbia (W. G. Ellison, Ed.). John Hopkins University Press, Baltimore, MD. pp. 388-389.
84. Watts, B. D. (2004). A recent breeding record of the Saltmarsh Sharp-tailed Sparrow in Gloucester County, Virginia. Raven 75:128-131.
85. Watts, B. D. (2010). Southern range limit for breeding in the Saltmarsh Sparrow. The Center for Conservation Biology, The College of William and Mary. https://www.ccbbirds.org/2010/07/02/southern-range-limit-for-breeding-in-the-saltmarsh-sparrow/
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115. DiQuinzio, D. A., P. W. C. Paton, and W. R. Eddleman. (2002). Nesting ecology of Saltmarsh Sharp-tailed Sparrows in a tidally restricted salt marsh. Wetlands 22 (1):179-185. doi: 10.1672/0277-5212(2002)022[0179:neosst]2.0.co;2. https://doi.org/10.1672/0277-5212(2002)022[0179:neosst]2.0.co;2
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128. Gjerdrum, C., K. Sullivan-Wiley, E. King, M. A. Rubega, and C. S. Elphick. (2008). Egg and chick fates during tidal flooding of Saltmarsh Sharp-tailed Sparrow nests. Condor 110 (3):579-584. doi: 10.1525/cond.2008.8559. https://doi.org/10.1525/cond.2008.8559
129. Shriver, W. G., T. P. Hodgman, J. P. Gibbs, and P. D. Vickery. (2010). Home range sizes and habitat use of Nelson’s and Saltmarsh sparrows. Wilson Journal of Ornithology 122 (2):340-345. doi: 10.1676/09-149.1. https://doi.org/10.1676/09-149.1
130. Chalfoun, A. D., and T. E. Martin. (2007). Assessments of habitat preferences and quality depend on spatial scale and metrics of fitness. Journal of Applied Ecology 44 (5):983-992. doi: 10.1111/j.1365-2664.2007.01352.x. https://doi.org/10.1111/j.1365-2664.2007.01352.x
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