Inherited differences of migratory phenotypes in two Acrocephalus warblers in relation to geomagnetic field parameters

Ilieva, Mihaela; Bianco, Giuseppe; Åkesson, Susanne

doi:10.1007/s00265-023-03373-z

Cited by 2 publications

(3 citation statements)

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“…The possibility of continuing the nocturnal migratory ight into the daytime was recently reported in another short-distance migrant, European starling (Sturnus vulgaris), which had been previously assumed to migrate primarily during the day (Vīgants et al 2023). In captive conditions, a similar explanation was recently proposed for circadian activity dynamics in Sedge warblers (Acrocephalus schoenobaenus) in autumn (Ilieva et al 2023).…”

Section: Sex-speci C Migration Speed (Hypothesis 3: Males Travelsupporting

confidence: 71%

“…2). Assuming that the circadian pattern of migratory activity might re ect actual behaviour in the wild (Schmaljohann et al 2015;Ilieva et al 2023), the observed dynamics of circadian activity suggest that, in the wild, male reed buntings start their migration shortly before sunrise and continue migratory ight some hours during daytime, while females migrate mainly during the second half of the night and cease migration around sunrise. The possibility of continuing the nocturnal migratory ight into the daytime was recently reported in another short-distance migrant, European starling (Sturnus vulgaris), which had been previously assumed to migrate primarily during the day (Vīgants et al 2023).…”

Section: Sex-speci C Migration Speed (Hypothesis 3: Males Travelmentioning

confidence: 99%

“…It has been shown that migratory activity in caged birds is a useful proxy for the species, population and even individual motivation to migrate (Berthold 1996;Eikenaar et al 2014;Deakin et al 2019). Moreover, such activity occurs at a species-and/or population-speci c time of the year and follows speci c circadian patterns (Schmaljohann et al 2015;Ilieva et al 2023). Most of our knowledge on temporal patterns of migratory activity between and within migratory seasons comes from experimental studies on small passerine birds that exclusively migrate either at night (reviewed in Berthold 1996;Gwinner 1996a;Gwinner 1996b) or during the daytime (Berthold 1996; Ramenofsky et al 2012; Bojarinova and Babushkina 2015; Stey et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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Sex-specific migration strategies and underlying physiology contribute to spring arrival protandry in a songbird

Bojarinova,

Demina,

Chetverikova

et al. 2024

Preprint

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In spring, many migrating songbirds exhibit protandry (the phenomenon whereby males precede females in arrival at breeding sites). The reed bunting (Emberiza schoeniclus) is a short-distance migrant which expresses a high degree of protandry and combines both nocturnal and diurnal movements during migrations. In experimental conditions, we studied the proximate mechanisms of protandry and compared locomotor behavior between spring and autumn migrations. We assumed that captive behavior is a proxy for the behavior that birds demonstrate in the wild. Combined, the analysis of seasonal patterns and circadian dynamics of locomotor activity suggested that male reed buntings depart from wintering grounds by daytime flights approximately two weeks earlier than females. Later, they develop nocturnal activity, take off shortly before dawn and continue their flight for several hours in the morning. We argue that such behavior allows males to benefit from both the advantage of nocturnal flight and an efficient start of foraging, thereby reducing the stopover duration (by minimizing search/settling costs) and increasing the total migration speed. In contrast, females migrate predominantly at night in spring. Sex-related variation in behavior was accompanied by differences in energetic conditions; males in spring had, on average, lower fat reserves. However, leukocyte profile parameters were similar in males and females. In contrast, in autumn, both sexes display similar levels/dynamics of locomotor activity and fat reserves. Overall, our results describe unique sex-specific migratory behaviour and physiology in reed buntings in spring, which, we assume, contribute to spring arrival protandry in this species.

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Section: Sex-speci C Migration Speed (Hypothesis 3: Males Travelsupporting

confidence: 71%