Patrick J. Weatherhead
Home Snake Research Miscellaneous Research
Bird Research
I began my own graduate work studying mating systems and sexual selection, and those topics continue to be a central theme of avian research in my lab. In the past decade this work has benefited greatly from the application of DNA-based genetic markers, in particular to determine paternity. Other topics of interest include using nest defense to test predictions from life history theory, and to learn more about interactions with predators, and a variety of other aspects of reproductive behavior and ecology. More applied problems such as determining the ecological factors underlying blackbird damage to corn crops, band recovery biases in waterfowl, and acid rain effects on common goldeneye have also been investigated. Geographically, the studies have ranged from the arctic to the coast of the Gulf of Mexico.
Refereed Publications
161. Sperry, J.H., R.G. Peak, D.A. Cimprich and P.J. Weatherhead. Snake activity affects seasonal variation in nest predation risk for birds. Journal of Avian Biology, in press.
160. Maddox, J.D., R.M. Bowden, and P.J. Weatherhead. Yolk testosterone and estradiol variation relative to clutch size, laying order and hatching asynchrony in common grackles. Journal of Ornithology, in press.
159. Maddox, J.D. and P.J. Weatherhead. 2008. Egg size variation in birds with asynchronous hatching: is bigger really better? American Naturalist 171: 358-365. [PDF]
158. Weatherhead, P.J., K.E. Muma, J.D. Maddox, J.M. Knox and K.W. Dufour. 2007. Morphology vs. molecules: sexing red-winged blackbird nestlings. Journal of Field Ornithology 78: 441-448. [PDF]
157. Rowe, K.M.C. and P.J. Weatherhead. 2007. Social and ecological factors affecting paternity allocation in American robins with overlapping broods. Behavioral Ecology and Sociobiology 61: 1283-1291. [PDF]
156. Maddox, J.D. and P.J. Weatherhead. 2006. Nests without eggs: abandonment or cryptic predation? Auk 123:135-140. [PDF]
155. Ward, M.P. and P.J. Weatherhead. 2005. Sex-specific differences in site fidelity and the costs of dispersal in yellow-headed blackbirds. Behavioral Ecology and Sociobiology 59:108-118. [PDF]
154. Weatherhead, P.J. 2005. Long-term decline in a red-winged blackbird population: ecological causes and sexual selection consequences. Proceedings of the Royal Society of London B 272:2313-2317. [PDF]
153. Weatherhead, P.J. 2005. Effect of climate variation on timing of nesting, reproductive success and offspring sex ratios of red-winged blackbirds. Oecologia 144:168-175. [PDF]
152. Weatherhead, P.J. and K.W. Dufour. 2005. Limits to sexual size dimorphism in red-winged blackbirds: the cost of getting big? Biological Journal of the Linnean Society 85:353-361. [PDF]
151. Weatherhead, P.J. and G. Blouin-Demers. 2004. Understanding avian nest predation: why ornithologists should study snakes. Journal of Avian Biology 35: 185-190. [PDF]
150. Kissner, K.J., P.J. Weatherhead, and C.M. Francis. 2003. Sexual size dimorphism and timing of spring migration in birds. Journal of Evolutionary Biology 16: 154-162. [PDF]
149. Rockwell, R.F., C.R. Witte, R.L. Jeffries, and P.J. Weatherhead. 2003. Response of nesting savannah sparrows to 25 years of habitat change in a snow goose colony. Ecoscience 10: 33-37.
148. Gunness, M.A. and P.J. Weatherhead. 2002. Variation in nest defense in ducks: methodological and biological insights. Journal of Avian Biology 33: 191-198.[PDF]
147. Weatherhead, P.J. and S.J. Sommerer. 2001. Breeding synchrony and nest predation in red-winged blackbirds. Ecology 82: 1632-1641.
146. Gunness, M.A., R.G. Clark, and P.J. Weatherhead. 2001. Counterintuitive parental investment by female dabbling ducks in response to variable habitat quality. Ecology 82: 1151-1158.
145. Weatherhead, P.J. and K.W. Dufour. 2000. Fledging success as an index of recruitment in red-winged blackbirds. Auk 117: 627-633. [PDF]
144. Weatherhead, P.J., K.W. Dufour, S.C. Loughheed and C.G. Eckert. 1999. A test of the good-genes-as-heterozygosity hypothesis using red-winged blackbirds. Behavioral Ecology 10: 619-625. [PDF]
143. Weatherhead, P.J. 1999. Sequential mating patterns suggest extra-pair mating is not part of a mixed reproductive strategy by female red-winged blackbirds. Proceedings of the Royal Society of London B 266: 1027-1031. [PDF]
142. Weatherhead, P.J. and S.M. Yezerinac. 1998. Breeding synchrony and extra-pair mating in birds. Behavioral Ecology and Sociobiology 43: 217-219. [PDF]
141. Weatherhead, P.J. 1998. Natal philopatry and local resource competition in the common goldeneye. Journal of Avian Biology 29: 321-322.
140. Lanctot, R.B., P.J. Weatherhead, B. Kempenaers, and K. T. Scribner. 1998. Male traits, mating tactics and reproductive success in the buff-breasted sandpiper, Tryngites subruficollis. Animal Behaviour 56: 419-432. [PDF]
139. Dufour, K.W. and P.J. Weatherhead. 1998. Bilateral symmetry and social dominance in captive male red-winged blackbirds. Behavioral Ecology and Sociobiology 42: 71-76. [PDF]
138. Dufour, K.W. and P.J. Weatherhead. 1998. Bilateral symmetry as an indicator of male quality in red-winged blackbirds: associations with measures of health, viability, and parental effort. Behavioral Ecology 9: 220-231.
137. Dufour, K.W. and P.J. Weatherhead. 1998. Reproductive consequences of bilateral asymmetry for individual male red-winged blackbirds. Behavioral Ecology 9: 232-242.
136. Weatherhead, P.J. and P.T. Boag. 1997. Genetic estimates of annual and lifetime reproductive success in red-winged blackbirds. Ecology 78: 884-896.
135. Yezerinac, S.M. and P.J. Weatherhead. 1997. Reproductive synchrony and extra-pair mating strategy in a socially monogamous bird, Dendroica petechia. Animal Behaviour 54: 1393-1403. [PDF]
134. Lanctot, R.B., K.T. Scribner, B. Kempenaers and P.J. Weatherhead. 1997. Lekking without a paradox in the buff-breasted sandpiper. American Naturalist 149: 1051-1070.
133. Weatherhead, P.J. 1997. Breeding synchrony and extra-pair mating in red-winged blackbirds. Behavioral Ecology and Sociobiology 40: 151-158. [PDF]
132. Yezerinac, S.M. and P.J. Weatherhead. 1997. Extra-pair mating, male plumage coloration and sexual selection in yellow warblers (Dendroica petechia). Proceedings of the Royal Society of London B 264: 527-532. [PDF]
131. Lanctot, R.B. and P.J. Weatherhead. 1997. Ephemeral lekking behavior in the buff-breasted sandpiper, Tryngites subruficollis. Behavioral Ecology 8: 268-278.
130. Montgomerie, R. and P.J. Weatherhead. 1997. How robins find worms. Animal Behaviour 54: 143-151. [PDF]
129. Dufour, K.W. and P.J. Weatherhead. 1996. Estimation of organism-wide asymmetry in red-winged blackbirds and its relation to studies of mate selection. Proceedings of the Royal Society of London B 263: 769-775. [PDF]
128. Leonard, M.L. and P.J. Weatherhead. 1996. Dominance rank and offspring sex ratios in domestic fowl. Animal Behaviour 51: 725-731. [PDF]
127. Yezerinac, S.M., P.J. Weatherhead and P. T. Boag. 1996. Cuckoldry and lack of parentage-dependent parental care in yellow warblers: a cost-benefit approach. Animal Behaviour 52: 821-832. [PDF]
126. Weatherhead, P.J. 1995. Effects on female reproductive success of familiarity and experience among male red-winged blackbirds. Animal Behaviour 49: 967-976. [PDF]
125. Yezerinac, S. M. and P.J. Weatherhead. 1995. Plumage coloration, differential attraction of vectors and haematozoa infections in birds. Journal of Animal Ecology 64: 528-537.
124. Weatherhead, P.J., K.J. Metz, D. Shutler, K.E. Muma and G.F. Bennett. 1995. Blood parasites and dominance in captive blackbirds. Journal of Avian Biology 26: 121-123.
123. Weatherhead, P.J. and R. Montgomerie. 1995. Local resource competition and sex ratio variation in birds. Journal of Avian Biology 26: 168-171.
122. Weatherhead, P.J. and P.T. Boag. 1995. Pair and extra-pair mating success relative to male quality in red-winged blackbirds. Behavioral Ecology and Sociobiology 37: 81-91.
121. Yezerinac, S.M., P.J. Weatherhead and P.T. Boag. 1995. Extra-pair paternity and the opportunity for sexual selection in a socially monogamous bird (Dendroica petechia). Behavioral Ecology and Sociobiology 37: 179-188.
120. Teather, K.L. and P.J. Weatherhead. 1995. The influence of age and access to females on dominance in captive male brown-headed cowbirds (Molothrus ater). Canadian Journal of Zoology 73: 1012-1018.
119. Weatherhead, P.J. and K.L. Teather. 1994. Sexual size dimorphism and egg-size allometry in birds. Evolution 48: 671-678. [PDF]
118. Weatherhead, P.J. 1994. Mixed mating strategies by females may strengthen the sexy son hypothesis. Animal Behaviour 47: 1210-1211.
117. Weatherhead, P.J. and R.G. Clark. 1994. Natural selection and sexual size dimorphism in red-winged blackbirds. Evolution 48: 1071-1079. [PDF]
116. Mallory, M.L., D.K. McNicol and P.J. Weatherhead. 1994. Habitat quality and reproductive effort of common goldeneyes nesting near Sudbury, Canada. Journal of Wildlife Management 58: 552-560.
115. Forbes, M.R.L., R.G. Clark, P.J. Weatherhead and T. Armstrong. 1994. Risk-taking by female ducks: intra- and interspecific tests of nest defense theory. Behavioral Ecology and Sociobiology 34: 79-85.
114. Shutler, D. and P.J. Weatherhead. 1994. Movement patterns and territory acquisition by male red-winged blackbirds. Canadian Journal of Zoology 72: 712-720.
113. Weatherhead, P.J. and M.L. Forbes. 1994. Natal philopatry in passerine birds: genetic or ecological influences? Behavioral Ecology 5: 426-433.
112. Teather, K.L. and P.J. Weatherhead. 1994. Allometry, adaptation, and the growth and development of sexually dimorphic birds. Oikos 71: 515-525.
111. Forbes, M.R.L., P.J. Weatherhead and G.F. Bennett. 1994. Blood parasites of blue grouse: variation in prevalence and patterns of interspecific association. Oecologia 97: 520-525.
110. Weatherhead, P.J., R. Montgomerie, H.L. Gibbs and P.T. Boag. 1994. The cost of extra-pair fertilizations to female red-winged blackbirds. Proceedings of the Royal Society of London B 258: 315-320. [PDF]
109. Mallory, M.L. and P.J. Weatherhead. 1993. Incubation rhythms and mass loss of common goldeneyes. Condor 95: 849-859.
108. Mallory, M.L., P.J. Weatherhead, D.K. McNicol and M.E. Wayland. 1993. Nest site selection by common goldeneyes in response to habitat features influenced by acid precipitation. Ornis Scandinavica 24: 59-64.
107. Dufour, K.W., C.D. Ankney and P.J. Weatherhead. 1993. Condition and vulnerability to hunting among mallards staging at Lake St. Clair, Ontario. Journal of Wildlife Management 57: 209-215.
106. Dufour, K.W., C.D. Ankney and P.J. Weatherhead. 1993. Nonrepresentative sampling during waterfowl banding: emphasis on body condition. Journal of Wildlife Management 57: 741-751.
105. Metz, K.J. and P.J. Weatherhead. 1993. An experimental test of the contrasting-color hypothesis of red-band effects in red-winged blackbirds. Condor 95: 395-400.
104. Mallory, M.L. and P.J. Weatherhead. 1993. Responses of nesting mergansers to parasitic common goldeneye eggs. Animal Behaviour 46: 1226-1228.
103. Mallory, M.L. and P.J. Weatherhead. 1993. Observer effects on common goldeneye nest defense. Condor 95: 467-469.
102. Weatherhead, P.J., K.J. Metz, G.F. Bennett and R.E. Irwin. 1993. Parasite faunas, testosterone and secondary sexual traits in male red-winged blackbirds. Behavioral Ecology and Sociobiology 33: 13-23.
101. McRae, S.B., P.J. Weatherhead and R. Montgomerie. 1993. American robin nestlings compete by jockeying for position. Behavioral Ecology and Sociobiology 33: 101-106. [PDF]
100. Metz, K.J. and P.J. Weatherhead. 1992. Seeing red: uncovering coverable badges in red-winged blackbirds. Animal Behaviour 43: 223-229.
99. Weatherhead, P.J. and G.F. Bennett. 1992. Ecology of parasitism of brown-headed cowbirds by haematozoa. Canadian Journal of Zoology 70: 1-7.
98. Shutler, D. and P.J. Weatherhead. 1992. Surplus territory contenders in male red-winged blackbirds: where are the desperados? Behavioral Ecology and Sociobiology 31: 97-106.
97. Mallory, M.L. and P.J. Weatherhead. 1992. A comparison of three techniques for monitoring avian nest attentiveness and weight change. Journal of Field Ornithology 63: 428-435.
96. Scott, D.M., P.J. Weatherhead and C.D. Ankney. 1992. Egg-eating by female brown-headed cowbirds. Condor 94: 579-584.
95. Muma, K.E. and P.J. Weatherhead. 1991. Plumage variation and dominance in captive female red-winged blackbirds. Canadian Journal of Zoology 69: 49-54.
94. Prior, K.A. and P.J. Weatherhead. 1991. Competition at the carcass: opportunities for social foraging by turkey vultures in southern Ontario. Canadian Journal of Zoology 69: 1550-1556.
93. Metz, K.J. and P.J. Weatherhead. 1991. Color bands function as secondary sexual traits in male red-winged blackbirds. Behavioral Ecology and Sociobiology 28: 23-27.
92. Weatherhead, P.J. 1991. The adaptive value of thick-shelled eggs for brown-headed cowbirds. Auk 108: 196-198.
91. Weatherhead, P.J., G.F. Bennett and D. Shutler. 1991. Sexual selection and parasites in wood-warblers. Auk 108: 147-152.
90. Prior, K.A. and P.J. Weatherhead. 1991. Turkey vultures foraging at experimental food patches: a test of information transfer at communal roosts. Behavioral Ecology and Sociobiology 28: 385-390.
89. Shutler, D. and P.J. Weatherhead. 1991. Owner and floater red-winged blackbirds: determinants of status. Behavioral Ecology and Sociobiology 28: 235-241.
88. Weatherhead, P.J. and K.L. Teather. 1991. Are skewed fledgling sex ratios in sexually dimorphic birds adaptive? American Naturalist 138: 1159-1172. [PDF]
87. Weatherhead, P.J. and G.F. Bennett. 1991. Ecology of red-winged blackbird parasitism by haematozoa. Canadian Journal of Zoology 69: 2352-2359.
86. Gibbs, H.L., P.T. Boag, B.N. White, P.J. Weatherhead and L.M. Tabak. 1991. Detection of a hypervariable DNA locus in birds by hybridization with a mouse MHC probe. Molecular Biology and Evolution 8: 433-446.
85. Hurd, P.L., P.J. Weatherhead and S.B. McRae. 1991. Parental consumption of nestling feces: good food or sound economics? Behavioral Ecology 2: 69-76.
84. Weatherhead, P.J., R.D. Montgomerie and S.B. McRae. 1991. Egg-laying times of American robins. Auk 108: 965-967.
83. Shutler, D. and P.J. Weatherhead. 1991. Basal song rate variation in male red-winged blackbirds: sound and fury signifying nothing? Behavioral Ecology 2: 123-132.
82. Dufour, K.W. and P.J. Weatherhead. 1991. A test of the condition-bias hypothesis using brown-headed cowbirds trapped during the breeding season. Canadian Journal of Zoology 69: 2686-2692.
81. Hoysak, D.J. and P.J. Weatherhead. 1991. Sampling blood from birds: a technique and an assessment of its effect. Condor 93: 746-752.
80. Weatherhead, P.J. and R.D. Montgomerie. 1991. Good news and bad news about DNA fingerprinting. Trends in Ecology and Evolution 6: 173-174. [PDF]
79. Weatherhead, P.J., D.J. Hoysak, K.J. Metz and C.G. Eckert. 1991. A retrospective analysis of red-band effects on red-winged blackbirds. Condor 93: 1013-1016.
78. Gibbs, H.L., P.J. Weatherhead, P.T. Boag, B.N. White, L.M. Tabak and D.J. Hoysak. 1990. Realized reproductive success of polygynous red-winged blackbirds revealed by DNA markers. Science 250: 1394-1397. [PDF]
77. Weatherhead, P.J. and D.J. Hoysak. 1990. Genetics of long-spurred pheasants. Nature 343: 599-600.
76. Weatherhead, P.J. 1990. Nest defence as shareable paternal care in red-winged blackbirds. Animal Behaviour 39: 1173-1178.
75. Weatherhead, P.J. and S.B. McRae. 1990. Brood care in American robins: implications for mixed reproductive strategies by females. Animal Behaviour 39: 1179-1188.
74. Weatherhead, P.J. 1990. Secondary sexual traits, parasites, and polygyny in red-winged blackbirds, Agelaius phoeniceus. Behavioral Ecology 1: 125-130.
73. Mallory, M.L. and P.J. Weatherhead. 1990. Effects of nest parasitism and nest location on eggshell strength in waterfowl. Condor 92: 1031-1039.
72. Reid, M.L. and P.J. Weatherhead. 1990. Mate-choice criteria of Ipswich sparrows: the importance of variability. Animal Behaviour 40: 538-544.
71. Shutler, D. and P.J. Weatherhead. 1990. Targets of sexual selection: song and plumage of wood warblers. Evolution 44: 1967-1977.
70. Weatherhead, P.J. and D. Shutler. 1989. Sparrow sexual size dimorphism and testis size: a comment. Evolution 43: 1120-1121.
69. Weatherhead, P.J. 1989. Nest defence by song sparrows: methodological and life history considerations. Behavioral Ecology and Sociobiology 25: 129-136.
68. Weatherhead, P.J. 1989. Sex ratios, host-specific reproductive success, and impact of brown-headed cowbirds. Auk 106: 358-366.
67. Muma, K.E. and P.J. Weatherhead. 1989. Male traits expressed in females: direct or indirect sexual selection? Behavioral Ecology and Sociobiology 25: 23-31.
66. Teather, K.L. and P.J. Weatherhead. 1989. Sex-specific mortality in nestling great-tailed grackles. Ecology 70: 1485-1493.
65. Montgomerie, R.D. and P.J. Weatherhead. 1988. Risks and rewards of nest defence by parent birds. Quarterly Review of Biology 63: 167-187. [PDF]
64. Lightbody, J.P. and P.J. Weatherhead. 1988. Female settling patterns and polygyny: tests of a neutral-mate-choice hypothesis. American Naturalist 132: 20-33. [PDF]
63. Reid, M.L. and P.J. Weatherhead. 1988. Topographical constraints on competition for territories. Oikos 51: 115-117.
62. Teather, K.L., K.E. Muma and P.J. Weatherhead. 1988. Estimating female settlement from nesting data. Auk 105: 196-200.
61. Teather, K.L. and P.J. Weatherhead. 1988. Sex-specific energy requirements of great-tailed grackle (Quiscalus mexicanus) nestlings. Journal of Animal Ecology 57: 659-668.
60. Weatherhead, P.J. 1988. Adaptive disposal of fecal sacs? Condor 90: 518-519.
59. Eckert, C.G. and P.J. Weatherhead. 1987. Male characteristics, parental quality and the study of mate choice in the red-winged blackbird (Agelaius phoeniceus). Behavioral Ecology and Sociobiology 20: 35-42.
58. Eckert, C.G. and P.J. Weatherhead. 1987. Ideal dominance distributions: a test using red-winged blackbirds (Agelaius phoeniceus). Behavioral Ecology and Sociobiology 20: 43-52.
57. Weatherhead, P.J. 1987. Field tests of information transfer in communally roosting birds. Animal Behaviour 35: 614-615.
56. Clark, R.G. and P.J. Weatherhead. 1987. Influence of population size on habitat use by territorial male red-winged blackbirds in agricultural landscapes. Auk 104: 311-315.
55. Eckert, C.G. and P.J. Weatherhead. 1987. Owners, floaters and competitive asymmetries among territorial red-winged blackbirds. Animal Behaviour 35: 1317-1323.
54. Eckert, C.G. and P.J. Weatherhead. 1987. Competition for territories in red-winged blackbirds: is resource-holding potential realized? Behavioral Ecology and Sociobiology 20: 369-375.
53. Lightbody, J.P. and P.J. Weatherhead. 1987. Interactions among females in polygynous yellow-headed blackbirds. Behavioral Ecology and Sociobiology 21: 23-30.
52. Weatherhead, P.J., H. Greenwood and R.G. Clark. 1987. Natural selection and sexual selection on body size in red-winged blackbirds. Evolution 41: 1401-1403.
51. Weatherhead, P.J. and K.L. Teather. 1987. The paradox of age-related dominance in brown-headed cowbirds (Molothrus ater). Canadian Journal of Zoology 65: 2354-2357.
50. Lightbody, J.P. and P.J. Weatherhead. 1987. Polygyny in the yellow-headed blackbird: female choice versus male competition. Animal Behaviour 35: 1670-1684.
49. Weatherhead, P.J. and K.A. Boak. 1986. Site infidelity in song sparrows. Animal Behaviour 34: 1299-1310.
48. Clark, R.G. and P.J. Weatherhead. 1986. The effect of fine-scale variations in agricultural land use on the abundance of red-winged blackbirds. Canadian Journal of Zoology 64: 1951-1955.
47. Clark, R.G., P.J. Weatherhead, H. Greenwood and R.D. Titman. 1986. Numerical responses of red-winged blackbird populations to changes in regional land-use patterns. Canadian Journal of Zoology 64: 1944-1950.
46. Greenwood, H., R.G. Clark and P.J. Weatherhead. 1986. Condition bias of hunter-shot mallards (Anas platyrhynchos). Canadian Journal of Zoology 64: 599-601.
45. Brodsky, L.M. and P.J. Weatherhead. 1985. Time and energy constraints on courtship in wintering American black ducks. Condor 87: 33-36. [PDF]
44. Weatherhead, P.J. 1985. Sex ratios of red-winged blackbirds by egg size and laying sequence. Auk 102: 298-304. [PDF]
43. Brodsky, L.M. and P.J. Weatherhead. 1985. Variability in behavioural response of wintering black ducks to increased energy demands. Canadian Journal of Zoology 63: 1657-1662.
42. Brodsky, L.M. and P.J. Weatherhead. 1985. Diving by wintering black ducks: an assessment of atypical foraging. Wildfowl 36: 72-76.
41. Weatherhead, P.J. and C.D. Ankney. 1985. Condition bias and band recovery data: a reply to Burnham and Nichols. Wildlife Society Bulletin 13: 349-351.
40. Weatherhead, P.J., S.G. Sealy and R.M.R. Barclay. 1985. Risks of clustering in thermally-stressed swallows. Condor 87: 443-444. [PDF]
39. Weatherhead, P.J. and D.J. Hoysak. 1985. Dominance structuring of a blackbird roost: a reply to Giroux. Auk 102: 901-902. [PDF]
38. Weatherhead, P.J., H. Greenwood and R.G. Clark. 1984. On the use of avian mortality patterns to test sexual selection theory. Auk 101: 134-139. [PDF]
37. Weatherhead, P.J. 1984. Fecal sac removal by tree swallows: the cost of cleanliness. Condor 86: 187-191.
36. Weatherhead, P.J. 1984. Mate choice in avian polygyny: why do females prefer older males? American Naturalist 123: 873-875. [PDF]
35. Weatherhead, P.J. and C.D. Ankney. 1984. A critical assumption of band-recovery models may often be violated. Wildlife Society Bulletin 12: 198-199.
34. Weatherhead, P.J. and D.J. Hoysak. 1984. Dominance structuring of a red-winged blackbird roost. Auk 101: 551-555. [PDF]
33. Brodsky, L.M. and P.J. Weatherhead. 1984. Behavioural thermoregulation in wintering black ducks: roosting and resting. Canadian Journal of Zoology 62: 1223-1226.
32. Brodsky, L.M. and P.J. Weatherhead. 1984. Behavioral and ecological factors contributing to American black duck-mallard hybridization. Journal of Wildlife Management 48: 846-852.
31. Weatherhead, P.J. 1984. Patterns in roosting flocks: a re-evaluation of data and conclusions. Condor 86: 497-498.
30. Weatherhead, P.J. 1983. Two principal strategies in avian communal roosts. American Naturalist 121: 237-243. [PDF]
29. Greenwood, H., P.J. Weatherhead and R.D. Titman. 1983. A new age- and sex-specific molt scheme for the red-winged blackbird. Condor 85: 104-105. [PDF]
28. Weatherhead, P.J. and S.H. Tinker. 1983. Maize ear characteristics affecting vulnerability to damage by red-winged blackbirds. Protection Ecology 5: 167-175.
27. Clark, R.G., P.J. Weatherhead and R.D. Titman. 1983. On the relationship between breeding bird survey counts and estimates of male density in the red-winged blackbird. Wilson Bulletin 95: 453-459. [PDF]
26. Weatherhead, P.J. 1983. Secondary sex ratio adjustment in red-winged blackbirds (Agelaius phoeniceus). Behavioral Ecology and Sociobiology 12: 57-61.
25. Greenwood, H. and P.J. Weatherhead. 1982. Spring roosting dynamics of red-winged blackbirds: biological and management implications. Canadian Journal of Zoology 60: 750-753.
24. Bendell, B.E. and P.J. Weatherhead. 1982. Prey characteristics of upland-breeding red-winged blackbirds, Agelaius phoeniceus. Canadian Field-Naturalist 96: 265-271.
23. Weatherhead, P.J., S. Tinker and H. Greenwood. 1982. Indirect assessment of avian damage to agriculture. Journal of Applied Ecology 19: 773-782.
22. Weatherhead, P.J. 1982. Risk-taking by red-winged blackbirds and the Concorde Fallacy. Zeitschrift fur Tierpsychologie 60: 199-208.
21. McNicol, D.K., R.J. Robertson and P.J. Weatherhead. 1982. Seasonal, habitat and sex-specific food habits of red-winged blackbirds: implications for agriculture. Canadian Journal of Zoology 60: 3282-3289.
20. Weatherhead, P.J. and R.J. Robertson. 1981. In defense of the "sexy son" hypothesis. American Naturalist 117: 349-356. [PDF]
19. Weatherhead, P.J. and H. Greenwood. 1981. Age and condition bias of decoy-trapped birds. Journal of Field Ornithology 52: 10-15. [PDF]
18. Bendell, B.E., P.J. Weatherhead and R.K. Stewart. 1981. The impact of predation by red-winged blackbirds on European corn borer populations. Canadian Journal of Zoology 59: 1535-1538.
17. Weatherhead, P.J. 1981. The dynamics of red-winged blackbird populations at four late summer roosts in Quebec. Journal of Field Ornithology 52: 222-227. [PDF]
16. Weatherhead, P.J. 1980. Sexual dimorphism in two savannah sparrow populations. Canadian Journal of Zoology 58: 412-415.
15. Weatherhead, P.J. and J.R. Bider. 1980. Avian range extension northward to Deception Bay, Quebec. Arctic 33: 369.
14. Weatherhead, P.J., R.G. Clark, J.R. Bider and R.D. Titman. 1980. Movements of blackbirds and starlings in southwestern Quebec and eastern Ontario in relation to crop damage and control. Canadian Field-Naturalist 94: 75-79.
13. Weatherhead, P.J. and R.J. Robertson. 1980. Altruism in the savannah sparrow? Behavioral Ecology and Sociobiology 6: 185-186.
12. Weatherhead, P.J., H. Greenwood, S.H. Tinker and J.R. Bider. 1980. Decoy traps and the control of blackbird populations. Phytoprotection 61: 65-71.
11. Weatherhead, P.J., J.R. Bider and R.G. Clark. 1980. Surfactants and the management of red-winged blackbirds in Quebec. Phytoprotection 61: 39-47.
10. Weatherhead, P.J. and R.J. Robertson. 1980. Sexual recognition and anticuckoldry behaviour in savannah sparrows. Canadian Journal of Zoology 58: 991-996.
9. Weatherhead, P.J. and R.J. Robertson. 1979. Offspring quality and the polygyny threshold: "the sexy son hypothesis." American Naturalist 113: 201-208. [PDF]
8. Weatherhead, P.J. and J.R. Bider. 1979. Management options for blackbird problems in agriculture. Phytoprotection 60: 145-155.
7. Weatherhead, P.J. 1979. Do savannah sparrows commit the Concorde Fallacy? Behavioral Ecology and Sociobiology 5: 373-381.
6. Weatherhead, P.J. 1979. Behavioral implications of the defense of a shoveler brood by common eiders. Condor 81: 427.
5. Weatherhead, P.J. 1979. Ecological correlates of monogamy in tundra-breeding savannah sparrows. Auk 96: 391-401. [PDF]
4. Weatherhead, P.J. and R.J. Robertson. 1978. Intraspecific nest parasitism in the savannah sparrow. Auk 95: 744-745. [PDF]
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