Adaptive Temporal Programming of Molt and Migratory Disposition in Two Closely Related Long-Distance Migrants, the Pied Flycatcher (Ficedula hypoleuca) and the Collared Flycatcher (Ficedula albicollis)

Gwinner, Eberhard; Schwabl-Benzinger, Ingrid

doi:10.1007/978-3-642-68616-0_8

Cited by 14 publications

(11 citation statements)

References 13 publications

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“…We investigated the first full annual cycle of flycatchers in replicated studies of cohorts hatched in 1981 [27] and 2002. In this common garden experiment through time [21], nestlings were collected from the same German field site, on the same dates (Figures S1 and S2), and raised in identical captive settings [13,27]; thus we considered any systematic timing changes between cohorts as evidence of evolutionary change in the birds' inherited timing programmes. We recorded the timing of annual cycle events and grouped them by season (autumn, winter, spring) [9,13,27,28] (Figure 1).…”

Section: Replicated Experimental Studymentioning

confidence: 99%

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Evolutionary Response to Climate Change in Migratory Pied Flycatchers

et al. 2019

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Section: Replicated Experimental Studymentioning

confidence: 99%

“…Birds were weighed and checked for moult at least weekly, and every 2-3 d during the postjuvenile period, by the Institute team led by the authors of the original flycatcher study [13].…”

Section: Description Of Replication Study In Captivitymentioning

confidence: 99%

Evolutionary Response to Climate Change in Migratory Pied Flycatchers

et al. 2019

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“…1A, Helm and Gwinner 2006). Circannual rhythms are typically variable and occasionally not expressed by a fraction of birds, as evidenced in the few publications that tabulate individual patterns (Gwinner 1972, 1986, 1991, 1996, Gwinner and Schwabl‐Benzinger 1982, Holberton and Able 1992). The functional interpretation of individual differences is still a matter of speculation.…”

Section: Variation and Precision Of Circannual Cyclesmentioning

confidence: 99%

Zugunruheof migratory and non‐migratory birds in a circannual context

Helm

2006

Journal of Avian Biology

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Recent findings in non‐migratory birds have reopened questions about the interpretation and seasonal organization of Zugunruhe. I address the relationship between Zugunruhe and migration by comparing underlying circannual patterns in captive populations of migratory and non‐migratory stonechats. Zugunruhe was highly variable and lacked clear periodicity, indicating its sensitivity to external cues. Patterns of Zugunruhe were similar in African residents, European short‐distance migrants, and Siberian long‐distance migrants, revealing no major difference in circannual organization. Moult was regulated independently of Zugunruhe and timed more rigidly, particularly in stonechats from equatorial Africa. The persistent and variable circannual patterns of Zugunruhe suggest that non‐migratory and migratory stonechats have similar underlying programs but have modified the expression of actual migration. The findings, together with published observations from other species, emphasize the importance of considering programs for migration in a wide range of species, without losing sight of its environmental context.

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“…1, middle, right). Correspondingly, their annual cycles of gonadal function, molt, and migratory disposition are also under the control of a circannual rhythmicity that persists for several cycles in constant environmental conditions (Gwinner and Schwabl-Benzinger, 1982). Figure 3 shows the pattern of seasonal activities in birds of both species held for more than 1 year in a constant 12-hr photoperiod.…”

Section: Species Specificitymentioning

confidence: 99%

Photoperiod as a Modifying and Limiting Factor in the Expression of Avian Circannual Rhythms

Gwinner¹

1989

J Biol Rhythms

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In three species of birds that migrate long distances, the annual rhythms of gonadal activity, molt, and migratory restlessness (Zugunruhe) persist for more than 1 year under certain constant conditions. The most important zeitgeber for these circannual rhythms is the annual cycle of photoperiod, which adjusts the overall period of circannual rhythms to exactly 1 year and also provides for the appropriate adjustment of seasonal activities to the temporal structure of the environment. This is illustrated by results on garden warblers (Sylvia borin) indicating that the longer photoperiods experienced by individuals wintering far south in the African wintering area phase-advance spring migration and the accompanying gonadal development, relative to those of individuals wintering further north. The rate of acceleration is, however, slow enough to prevent a reproductive cycle during the Southern Hemisphere summer. Hence, endogenous circannual components and zeitgeber stimuli constitute a functional entity that provides as a whole for adaptive temporal programming. This idea is further supported by findings in the pied flycatcher (Ficedula hypoleuca), in which a circannual rhythmicity persists only if photoperiod in winter is at least as short as that normally encountered by the species in its wintering grounds slightly north of the equator. In collared flycatchers (Ficedula albicollis), in contrast, rhythmicity continues under much longer photoperiods, consistent with the fact that the wintering area of this species extends to latitudes far south of the equator. It is proposed that the adaptive function of circannual rhythms can be properly understood only if their interactions with environmental factors, particularly those that play a role as zeitgebers, are analyzed in sufficient detail. The biological significance of circannual rhythms may be more apparent in the context of the environmental constraints limiting their expression than in the often rather restricted set of conditions sustaining spontaneous annual cyclicity.

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Adaptive Temporal Programming of Molt and Migratory Disposition in Two Closely Related Long-Distance Migrants, the Pied Flycatcher (Ficedula hypoleuca) and the Collared Flycatcher (Ficedula albicollis)

Cited by 14 publications

References 13 publications

Evolutionary Response to Climate Change in Migratory Pied Flycatchers

Evolutionary Response to Climate Change in Migratory Pied Flycatchers

Zugunruheof migratory and non‐migratory birds in a circannual context

Photoperiod as a Modifying and Limiting Factor in the Expression of Avian Circannual Rhythms

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