Abstract
The signaling function of sexually selected traits, such as carotenoid-dependent avian plumage coloration, has received a great deal of recent attention especially with respect to parasitism and immunocompetence. We argue that parasite-mediated models of sexual selection may have an implicit temporal component that many researchers have ignored. For example, previous studies have demonstrated that carotenoid-dependent traits can signal past parasite exposure, current levels of parasitism, or the ability of individuals to manage parasitic infections in the future. We examined repeated measures of carotenoid-dependent skin color and blood parasitism in American kestrels (Falco sparverius) to distinguish whether coloration might signal current parasitism or the potential to deal with infections in the future. We found no evidence that coloration was related to current levels of parasitism in either sex. However, coloration of males significantly predicted their response to parasitism; males with bright orange coloration during prelaying, when mate choice is occurring, were more likely than dull yellow males to reduce their levels of infection by the time incubation began. Coloration during prelaying may advertise a male’s health later in the breeding season. For kestrels, the ability to predict future health would be highly beneficial given the male’s role in providing food to his mate and offspring. Coloration of females was not a significant predictor of parasitism in the future, and we provide several possible explanations for this result.
References
Balgooyen TG (1976) Behavior and ecology of the American kestrel (Falco sparverius L.) in the Sierra Nevada of California. Univ Calif Publ Zool 103:1–85
Berger DD, Mueller HC (1959) The bal-chatri: a trap for the birds of prey. Bird-Banding 30:18–26
Bortolotti GR, Iko WM (1992) Non-random pairing in American kestrels: mate choice versus intrasexual competition. Anim Behav 44:811–821
Bortolotti GR, Negro JJ, Tella JL, Marchant TA, Bird DM (1996) Sexual dichromatism in birds independent of diet, parasites and androgens. Proc R Soc Lond B Biol Sci 263:1171–1176
Bortolotti GR, Dawson RD, Murza GL (2002) Stress during feather development predicts fitness potential. J Anim Ecol 71:333–342
Bortolotti GR, Fernie KJ, Smits JE (2003) Carotenoid concentration and coloration of American kestrels (Falco sparverius) disrupted by experimental exposure to PBBs. Funct Ecol 17:651–657
Brawner WR, Hill GE, Sundermann CA (2000) Effects of coccidial and mycoplasmal infections on carotenoid-based plumage pigmentation in male house finches. Auk 117:952–963
Brush AH (1978) Avian pigmentation. In: Brush AH (ed) Chemical zoology, vol 10. Aves. Academic, New York, pp 141–164
Burley N (1977) Parental investment, mate choice, and mate quality. Proc Natl Acad Sci USA 74:3476–3479
Dawson RD, Bortolotti GR (1999) Prevalence and intensity of hematozoan infections in a population of American kestrels. Can J Zool 77:162–170
Dawson RD, Bortolotti GR (2000) Effects of hematozoan parasites on condition and return rates of American kestrels. Auk 117:373–380
Dawson RD, Bortolotti GR (2001) Sex-specific associations between reproductive output and hematozoan parasites of American kestrels. Oecologia 126:193–200
Faivre B, Grégoire A, Préault M, Cézilly F, Sorci G (2003) Immune activation rapidly mirrored in a secondary sexual trait. Science 300:103
Garvin MC, Homer BL, Greiner EC (2003) Pathogenicity of Haemoproteus danilewskyi, Kruse, 1890, in blue jays (Cyanocitta cristata). J Wildl Dis 39:161–169
Gray DA (1996) Carotenoids and sexual dichromatism in North American passerine birds. Am Nat 148:453–480
Hamilton WD, Zuk M (1982) Heritable true fitness and bright birds: a role for parasites? Science 218:384–387
Hamilton WJ, Poulin R (1997) The Hamilton and Zuk hypothesis revisited: a meta-analytical approach. Behaviour 134:299–320
Hill GE, Farmer KL (2005) Carotenoid-based plumage coloration predicts resistance to a novel parasite in the house finch. Naturwissenschaften 92:30–34
Hõrak P, Ots I, Vellau H, Spottiswoode C, Møller AP (2001) Carotenoid-based plumage coloration reflects hemoparasite infection and local survival in breeding great tits. Oecologia 126:166–173
Lande R (1980) Sexual dimorphism, sexual selection, and adaptation in polygenic characters. Evolution 34:292–305
Lindström K, Lundström J (2000) Male greenfinches (Carduelis chloris) with brighter ornaments have higher virus infection clearance rate. Behav Ecol Sociobiol 48:44–51
Lozano GA (1994) Carotenoids, parasites, and sexual selection. Oikos 70:309–311
McGraw KJ, Ardia DR (2003) Carotenoids, immunocompetence, and the information content of sexual colors: an experimental test. Am Nat 162:704–712
Merilä J, Sheldon BC, Lindström K (1999) Plumage brightness in relation to haematozoan infections in the greenfinch Carduelis chloris: bright males are a good bet. Ecoscience 6:12–18
Merino S, Moreno J, Sanz JJ, Arriero E (2000) Are avian blood parasites pathogenic in the wild? A medication experiment in blue tits (Parus caeruleus). Proc R Soc Lond B Biol Sci 267:2507–2510
Møller AP, Biard C, Blount JD, Houston DC, Ninni P, Saino N, Surai PF (2000) Carotenoid-dependent signals: indicators of foraging efficiency, immunocompetence or detoxification ability? Avian Poult Biol Rev 11:137–159
Negro JJ, Bortolotti GR, Tella JL, Fernie KJ, Bird DM (1998) Regulation of integumentary colour and plasma carotenoids in American Kestrels consistent with sexual selection theory. Funct Ecol 12:307–312
Nolan PM, Hill GE, Stoehr AM (1998) Sex, size, and plumage redness predict house finch survival in an epidemic. Proc R Soc Lond B Biol Sci 265:961–965
Olson VA, Owens IPF (1998) Costly sexual signals: are carotenoids rare, risky or required? Trends Ecol Evol 13:510–514
Saks L, Ots I, Hõrak P (2003) Carotenoid-based plumage coloration of male greenfinches reflects health and immunocompetence. Oecologia 134:301–307
Shykoff JA, Widmer A (1996) Parasites and carotenoid-based signal intensity: how general should the relationship be? Naturwissenschaften 83:113–121
Surai PF, Speake BK (1998) Distribution of carotenoids from the yolk to the tissues of the chick embryo. J Nut Biochem 9:645–651
Surai PF (1999) Vitamin E in avian reproduction. Poult Avian Biol Rev 10:1–60
Acknowledgments
We thank the many people who helped sample birds, and the late G. Bennett who examined smears for parasites. We thank E. Korpimäki, D. Shutler, and J. Wiehn for comments on various drafts of the manuscript. Funding was provided by the Natural Sciences and Engineering Research Council of Canada through a grant to GRB and a scholarship to RDD. The Canadian Wildlife Federation and Northern Scientific Training Program also provided funding to RDD. Our protocol was approved by the University of Saskatchewan Animal Care Committee.
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Dawson, R.D., Bortolotti, G.R. Carotenoid-dependent coloration of male American kestrels predicts ability to reduce parasitic infections. Naturwissenschaften 93, 597–602 (2006). https://doi.org/10.1007/s00114-006-0146-6
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DOI: https://doi.org/10.1007/s00114-006-0146-6