Physiological Preparation for Autumnal Migration in White-Crowned Sparrows

Moore, Michael C.; Donham, Richard S.; Farner, Donald S.

doi:10.2307/1367445

Cited by 59 publications

(38 citation statements)

References 26 publications

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“…Black-crown males hold larger territories, yet brown-crown birds pair and breed, suggesting that age-related morphology may not constrain breeding success (Ralph and Pearson, 1971). Regulation of prenuptial molt is not well understood (Wingfield and Silverin, 2002), but Moore et al (1982) showed that Z. l. gambelii held on short photoperiods (8 h:16 h light:dark) failed to molt while those maintained on constant photoperiod of 12 h:12 h light:dark did. In the present study, molt was first observed when photoperiod reached 11 h:13 h light:dark (Table 1), which may pinpoint a threshold for molt initiation in Z. l. gambelii ( Fig.…”

Section: Prenuptial Moltmentioning

confidence: 99%

“…For example, Zonototrichia spp., like many north temperate species, are known to be highly photoperiodic (Farner and Lewis, 1971;Lewis, 1975;Moore et al, 1982;Wingfield et al, 1996Wingfield et al, , 1997. Specifically, both subspecies held on short-day photoperiods require exposure to the increasing day lengths of spring for activation of the HPG to initiate development of migratory and breeding life history stages (Farner, 1950;Lewis, 1975;Mewaldt and King, 1977;Ramenofsky, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Behavioral and physiological traits of migrant and resident White-crowned Sparrows: a common garden approach

Ramenofsky

Campion

Krause

et al. 2017

Journal of Experimental Biology

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To accommodate a migratory life history, migrants express a greater number of physiological and behavioral stages per annum than residents and are thus considered to have higher finite state diversity (FSD). To investigate the physiological mechanisms and constraints associated with migration, direct comparison of two subspecies of white-crowned sparrow -migrant, Zonotrichia leucophrys gambelii, and resident, Z. l. nuttalli -were made under common garden conditions of photoperiod and housing, as birds progressed from winter through the vernal life history stages. We tested the hypothesis that migrants (higher FSD) respond differently than residents (lower FSD) to the initial predictive cue, photoperiod, to initiate and integrate the progression of vernal stages of prenuptial molt, migration and development of breeding. If differences in vernal phenology were noted, then the basis for the distinctions was considered genetic. Results indicate that (1) residents had a lower threshold to vernal photoperiod with elevations of plasma androgen, growth and development of reproductive structures preceding those of migrants; (2) only migrants displayed prenuptial molt, preparations for migration and migratory restlessness; and (3) neither baseline nor stress-induced plasma corticosterone differed across subspecies, suggesting energetic demands of the common garden were insufficient to induce a differential adrenocortical response in either subspecies, highlighting the impact of environmental conditions on corticosterone secretion. Thus, in a common garden experiment, Z. l. gambelii responds differently to the initial predictive cue, photoperiod, to initiate and execute the vernal stages of molt, migration and development of breeding in comparison to the shared stage of breeding with Z. l. nuttalli, confirming a genetic basis for the subspecies differences.

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Section: Prenuptial Moltmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Behavioral and physiological traits of migrant and resident White-crowned Sparrows: a common garden approach

Ramenofsky

Campion

Krause

et al. 2017

Journal of Experimental Biology

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“…Possible means of communication between adjacent follicles should be explored. Moore et al (1982), on the basis of results of experiments with Z.l. gambelii, have suggested that photorefractoriness, postnuptial molt, and premigratory fattening are physiologically coupled events that are induced by long days with the time of onset being inversely related to daylength; however, the rates of postnuptial molt and fattening are inversely related to daylength once these functions have begun.…”

Section: Moltmentioning

confidence: 99%

“…The magnitude of the fine adjustment is much greater in females than in the males. The longer days of spring and early summer also constitute the information for the ultimate development of photorefractoriness, which causes the seasonal discontinuation of reproductive function, to which the induction of the postnuptial molt and autumnal migration are coupled (e.g., Moore et al 1982, Farner et al 1983). As noted above for several species, in the single-brooded Z. l. gambelii the cycles of plasma levels of LH, testosterone and estrogens are unimodal.…”

Section: Endocrinology Of Feral Speciesmentioning

confidence: 99%

Some Recent Advances in Avian Physiology

Farner

1983

Journal of the Yamashina Institute for Ornithology

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With primary attention to feral species, some important, recent trends in avian physiology have been selected and briefly described. Included are investigations of the exchanges of gases between embryo and external environment during incubation; structure and function of the lung-airsac system; avian energetics; control and energetic cost of molt; osmoregulation, ionoregulation and nitrogen excretion, including roles of kidney, lower gut, salt glands, and renin-angiotensin system; endocrinology; and orientation and navigation. Among these trends there has been an increase in the spectrum of species investigated, greater effort to make measurements under natural conditions and successes with experiments on feral species in the field. Physiological investigations have been facilitated by the great fund of information on the natural history and zoogeography of birds.

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“…Photostimulation (exposure to longer days) has been found to induce migratory restlessness (Zugunruhe) and preparations for breeding in many species (Farner and Gwinner 1980;Gwinner 1988;Hahn et al 1997;Dawson et al 2001). In addition, vernal photostimulation has been suggested to function independently as a ''remote timer'' for the initiation of autumn events (King 1963;Farner et al 1980;Moore et al 1982;Berthold 2002).…”

Section: Introductionmentioning

confidence: 99%

Carry-over effects of day length during spring migration

Helm

Gwinner

2005

J Ornithol

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The day lengths to which migratory birds are exposed depend on the timing and course of their journey. While winter day length is known to influence vernal events, it is not clear if birds also use day length during the spring migration as a temporal cue. We addressed this question by exposing captive stonechats (Saxicola torquata) to two different photoperiodic simulations of spring migration routes, following common winter conditions.

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Physiological Preparation for Autumnal Migration in White-Crowned Sparrows

Cited by 59 publications

References 26 publications

Behavioral and physiological traits of migrant and resident White-crowned Sparrows: a common garden approach

Behavioral and physiological traits of migrant and resident White-crowned Sparrows: a common garden approach

Some Recent Advances in Avian Physiology

Carry-over effects of day length during spring migration

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