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Plumage Development and Molt in Long-Tailed Manakins (Chiroxiphia Linearis): Variation According to Sex and Age

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Plumage Development and Molt in Long-Tailed Manakins (Chiroxiphia Linearis): Variation According to Sex and Age University of Windsor Scholarship at UWindsor Biological Sciences Publications Department of Biological Sciences 2007 Plumage development and molt in long-tailed manakins (chiroxiphia linearis): variation according to sex and age Stéphanie M. Doucet University of Windsor David B. McDonald Mercedes S. Foster Rob P. Clay D. B. Lank Follow this and additional works at: https://scholar.uwindsor.ca/biologypub Part of the Biology Commons Recommended Citation Doucet, Stéphanie M.; McDonald, David B.; Foster, Mercedes S.; Clay, Rob P.; and Lank, D. B., "Plumage development and molt in long-tailed manakins (chiroxiphia linearis): variation according to sex and age" (2007). The Auk, 124, 1, 29-43. https://scholar.uwindsor.ca/biologypub/1113 This Article is brought to you for free and open access by the Department of Biological Sciences at Scholarship at UWindsor. It has been accepted for inclusion in Biological Sciences Publications by an authorized administrator of Scholarship at UWindsor. For more information, please contact [email protected]. PLUMAGE DEVELOPMENT AND MOLT IN LONG-TAILED MANAKINS (CHIROXIPHIA LINEARIS): VARIATION ACCORDING TO SEX AND AGE Author(s): Stéphanie M. Doucet, David B. McDonald, Mercedes S. Foster, and Rob P. Clay Source: The Auk, 124(1):29-43. Published By: The American Ornithologists' Union https://doi.org/10.1642/0004-8038(2007)124[29:PDAMIL]2.0.CO;2 URL: http://www.bioone.org/doi/full/10.1642/0004-8038%282007%29124%5B29%3APDAMIL %5D2.0.CO%3B2 BioOne (www.bioone.org) is a nonprofit, online aggregation of core research in the biological, ecological, and environmental sciences. BioOne provides a sustainable online platform for over 170 journals and books published by nonprofit societies, associations, museums, institutions, and presses. Your use of this PDF, the BioOne Web site, and all posted and associated content indicates your acceptance of BioOne’s Terms of Use, available at www.bioone.org/page/terms_of_use. Usage of BioOne content is strictly limited to personal, educational, and non-commercial use. Commercial inquiries or rights and permissions requests should be directed to the individual publisher as copyright holder. BioOne sees sustainable scholarly publishing as an inherently collaborative enterprise connecting authors, nonprofit publishers, academic institutions, research libraries, and research funders in the common goal of maximizing access to critical research. The Auk 124(1):29–43, 2007 © The American Ornithologists’ Union, 2007. Printed in USA. PLUMAGE DEVELOPMENT AND MOLT IN LONG-TAILED MANAKINS (CHIROXIPHIA LINEARIS): VARIATION ACCORDING TO SEX AND AGE S M. D,1,5 D B. MD,2 M S. F,3 R P. C~4,6 1Department of Biological Sciences, 401 Sunset Avenue, University of Windsor, Windsor, Ontario N9B 3P4, Canada; 2Department of Zoology and Physiology, University of Wyoming, Laramie, Wyoming 80721, USA; 3U.S. Geological Survey Patuxent Wildlife Research Center, National Museum of Natural History, 10th and Constitution Avenue NW, Washington, D.C. 20560, USA; and 4Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, United Kingdom A.—Lek-mating Long-tailed Manakins (Chiroxiphia linearis) exhibit an unusual pa ern of delayed plumage maturation. Each year, males progress through a series of predefi nitive plumages before a aining defi nitive plumage in their fi h calendar year. Females also exhibit variation in plumage coloration, with some females displaying male-like plumage characteristics. Using data from mist-net captures in northwest Costa Rica (n = 1,315) and museum specimens from throughout the range of Long-tailed Manakins (n = 585), we documented the plumage sequence progression of males, explored variation in female plum- age, and described the timing of molt in this species. Males progressed through a series of age-specifi c predefi nitive plumages, which enabled the accurate aging of predefi nitive-plumaged males in the fi eld; this predefi nitive plumage sequence is the basis for age-related status-signaling in these males. Females tended to acquire red coloration in the crown as they aged. However, colorful plumage in females may be a byproduct of selection on bright male plumage. Females exhibited an early peak of molt activity from February to April, li le molt from May through July, and a second, more pronounced peak of molt activity in October. By contrast, males in older predefi nitive-plumage stages and males in defi nitive plumage exhibited comparable unimodal distributions in molt activity beginning in June and peaking between July and October. Our data are consistent with selective pres- sure to avoid the costs of molt–breeding overlap in females and older males. Our fi ndings have important implications for social organization and signaling in Long- tailed Manakins, and for the evolution of delayed plumage maturation in birds. Received 20 May 2005, accepted 5 January 2006. Key words: Chiroxiphia linearis, cooperation, delayed plumage maturation, hierarchy, leks, Long-tailed Manakin, plumage coloration. Desarrollo del Plumaje y Muda en Chiroxiphia linearis: Variación de Acuerdo al Sexo y la Edad R.—En Chiroxiphia linearis se presenta un patrón inusual de maduración retardada del plumaje. Cada año, los machos pasan por una serie de plumajes predefi nitivos antes de acanzar su plumaje defi nitivo en su quinto año calendario. Las hembras también exhiben variación en la coloración del plumaje: algunas presentan características del plumaje similares a las de los machos. Empleando datos de capturas 5E-mail: [email protected] 6Present address: BirdLife International, Vicente Cárdenas E5-7S y Japón, 3er Piso, C. P. 17-17-717, Quito, Ecuador. 29 30 D . [Auk, Vol. 124 hechas con redes de niebla en el noroeste de Costa Rica (n = 1,315) y especímenes de museo de todo el rango de distribución (n = 585), documentamos la secuencia de plumajes progresivos de los machos, exploramos la variación en el plumaje de las hembras y describimos el momento en que tiene lugar la muda en C. linearis. Los machos progresaron a través de una serie de plumajes pre-defi nitivos específi cos para cada clase de edad, lo que permitió determinar la edad de los machos sin plumaje defi nitivo con exactitud en el campo. Esta secuencia de plumajes predefi nitivos es la base para la señalización del estatus entre los machos, que está relacionada con la edad en esta especie. Las hembras tendieron a adquirir coloración roja en la corona a medida que envejecieron. Sin embargo, el plumaje colorido en las hembras podría ser un subproducto de la selección por plumaje brillante en los machos. Las hembras exhibieron un pico temprano de actividad de muda entre febrero y abril, poca muda entre mayo y julio y un segundo pico más pronunciado de actividad de muda en octubre. En contraste, los machos en estadíos de plumaje predefi nitivo más avanzados y en plumaje defi nitivo exhibieron distribuciones unimodales de actividad de muda comparables comenzando en junio, con un pico entre julio y octubre. Nuestros datos concuerdan con la existencia de una presión selectiva para evitar los costos del sobrelapamiento de la muda de las hembras y de los machos más viejos. Nuestros hallazgos tienen implicaciones importantes relacionadas con la organización social y la señalización entre individuos de C. linearis, y también para la evolución de la maduración retardada del plumaje en las aves. I , males do not assume defi ni- 1995; VanderWerf 2001; Mulder et al. 2002; tive, adult-like plumage for one or more years DuVal 2005). Investigations of the adaptive sig- a er hatching. In some species, this delay in nifi cance of delayed plumage maturation, and plumage maturation is accompanied by a delay of the signal function of variation in plumage, in sexual maturation (Lawton and Lawton require a thorough understanding of plumage 1986). In many sexually dichromatic, north- development and molt. Here, we investigate temperate passerines, however, males do not age- and sex-related plumage variation in the a ain their defi nitive plumage until a er their Long-tailed Manakin (Chiroxiphia linearis). fi rst potential breeding season, despite having Long-tailed Manakins have a lek-based mating reached sexual maturity (Rohwer et al. 1980, system (Foster 1977; McDonald 1989a, b). Males Lyon and Montgomerie 1986). The adaptive gather at lek sites, where they establish age- signifi cance of this type of delayed plumage graded dominance hierarchies. The two most maturation has been the focus of extensive dominant males at each lek, the alpha and beta research in recent decades (e.g., Rohwer et al. males, perform vocal duets and elaborate, dual- 1980, Lyon and Montgomerie 1986, Hill 1996), male dance displays for females visiting the leks. with most studies investigating the one-year Females usually copulate only with alpha males delays typically exhibited by north-temperate (Foster 1977, McDonald 1989b, McDonald and passerines. However, many tropical passerines Po s 1994). As in other lekking species (Höglund deviate from this pa ern. In some species, such and Alatalo 1995), females are solely responsible as bowerbirds and birds of paradise, males molt for rearing off spring (Foster 1976). into the same predefi nitive plumage for sev- As they grow older, male Long-tailed eral years before assuming defi nitive plumage Manakins progress through a series of tran- (Frith and Beehler 1998, Frith and Frith 2004). In sitional, predefi nitive plumage stages before other species, for example manakins, Darwin’s a aining defi nitive plumage in their fi h fi nches, paradise fl ycatchers, Hawaiian hon- calendar year (Foster 1987; McDonald 1989a, eycreepers, and monarch fl ycatchers, males 1993a). This delay is unusually long for such a progress through a transitional series of dif- small (15–21 g) passerine (Lawton and Lawton ferent predefi nitive plumage stages before 1986). Female Long-tailed Manakins also vary assuming defi nitive plumage (Foster 1987; in plumage color, with some females develop- McDonald 1989a, 1993a; Lepson and Freed ing red or tawny crown feathers, a trait believed January 2007] Plumage and Molt in Long-tailed Manakins 31 to be associated with age (McDonald 1989b).
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