Physiological challenges of migration

McWilliams, Scott R.; Ramenofsky, Marilyn; Pierce, Barbara J.

doi:10.1016/b978-0-12-819770-7.00017-7

Cited by 7 publications

(8 citation statements)

References 341 publications

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“…(Ramenofsky et al 2012;Stevenson et al 2022). Активность некоторых эндокринных систем (например, выработка глюкокортикоидных и тиреоидных гормонов) определяется в том числе действием экологических факторов Romero and Wingfield 2016;McWilliams et al 2022). Это обеспечивает тонкую подстройку врожденных программ под локальные условия, что важно при значительных межгодовых вариациях условий окружающей среды и актуально в связи с современным изменением климата (Helm et al 2013;Sokolov and Tsvey 2016;Åkesson and Helm 2020).…”

Section: миграционное состояниеunclassified

Endocrine mechanisms controlling the migratory disposition in birds

Tsvey

2023

Proceedings ZIN

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On Earth, billions of birds make seasonal migrations every year. Some species fly thousands of kilometers, overcoming seas, mountains and deserts on their way. For migration to be successful, birds must have perfect mechanisms for controlling its beginning, duration and termination. On the way, birds have to make many decisions: how much in energy reserves to accumulate; when to depart, how long and in which direction to fly; how to select optimal weather conditions for flight; and, finally, when and where to terminate migration. Prior to migration, birds develop a migratory disposition – a suite of changes in physiology and behavior (e.g. migratory fattening and expression of nocturnal migratory activity) which are typical for this important life-history stage. Such physiological changes and migratory behavior are the subject of hormonal regulation. The central structure that controls activity of various hormonal systems and development of migratory disposition is the hypothalamic-pituitary system. The hypothalamus controls the secretion of regulatory hormones by the pituitary gland and these hormones, in turn, regulate the activity of downstream endocrine glands. It has been established that spring migratory disposition is triggered by an increasing photoperiod, which stimulates the production of testosterone, prolactin and modulates the signaling of thyroid hormones. In contrast, it is practically unknown how autumn migratory disposition develops when the photoperiod decreases and does not stimulate release of the abovementioned hormones. While in migratory disposition, the endocrine control of behavior on the smaller temporal scales (for example, the level of fuel accumulation, or decision to depart from a migratory stopover) is associated with the combined action of melatonin, corticosterone, insulin, glucagon, adipokines, and other hormones and neurotransmitters. In this review, I will describe the role of these hormones in the control of migratory traits, highlight the existing inconsistencies, and present possible ways to progress in this area of research. A knowledge of endocrine regulation of migratory behavior will help to predict the limits of species adaptability, explain current population trends, and inform conservation actions, which is especially important in the light of modern climate change and anthropogenic transformation of landscapes.

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Section: миграционное состояниеunclassified

Endocrine mechanisms controlling the migratory disposition in birds

Tsvey

2023

Proceedings ZIN

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“…During this phase of the avian annual life cycle, birds must travel through unfamiliar areas, especially for immature individuals migrating for the rst time in their lives. Species adopting an intermittent migration strategy utilize foraging and resting stopover sites with various habitats and foraging conditions (Newton, 2008;Duijns et al 2017;McWilliams et al 2022). Other factors encountered by birds at stopover sites, such as weather (Newton 2007(Newton , 2008; Roberts et al 2014;Halupka et al 2017;Haest 2018), predator attacks (Bordjan and Kljun, 2018), and diseases (Altizer et al 2011), may also strongly impact the survival of avian populations during this important phase of the avian annual life cycle.…”

Section: Introductionmentioning

confidence: 99%

“…The physiological condition and health of birds are key factors in uencing the success of migration, as migrants face physically and cognitively demanding challenges that require a complex interplay of physiological processes, pushing them to the limits of their abilities (Rattner & Jehl, 1997;Seewagen 2020;McWilliams et al 2022). The concentration of elements in the organs of birds, including both essential elements and toxic elements, can serve as a proxy for their health and condition (Becker 2003; Roberts et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…However, migrating birds may be exposed to toxic elements, particularly at contaminated stopover sites (Xia et al 2021; Mukherjee et al 2022). The process of hyperphagic feeding at stopover sites, where birds rapidly accumulate fuel deposits for subsequent parts of migration, can play a signi cant role in the exposure to contaminants as it promotes the rapid absorption of toxic elements (Rattner & Jehl, 1997;Schummer et al 2011;Seewagen et al 2016;McWilliams et al 2022). Therefore, the quality of stopover sites, including the accumulation of various types of pollution, may signi cantly in uence the condition of birds during migration.…”

Section: Introductionmentioning

confidence: 99%

“…It should also be noted that an important factor in uencing bird exposure during the autumn migration period is its duration. It is signi cantly longer for many species compared to spring migration (Nilsson et al 2013;Schmaljohann 2018;McWilliams et al 2022).…”

Section: Introductionmentioning

confidence: 99%

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Concentration of toxic and essential elements in livers of birds of various foraging guilds collected during the autumn migration period in Poland

Ignacy,

Rafał,

Dariusz

et al. 2023

Preprint

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During migration, birds explore various habitats at stopover sites that differ in food resources and contamination levels. In this study, hepatic concentrations of 21 elements in 11 species of birds, representing various foraging guilds (omnivores, piscivores, molluscivores) and migration modes (migratory, sedentary), were analyzed. The samples were collected during the autumn migration period in Poland. The concentrations of elements determined in this study exhibited high inter-species variability, reflecting the diversity of food resources used by specific bird groups and their contamination levels. Many of the investigated individuals from different species showed exceeded levels of subclinical toxicity and moderate clinical poisoning due to Cd and Hg. The data collected confirmed the limited ability of As to enter ecosystem pathways. This study suggests that measuring hepatic elemental concentrations can help detect environmental contamination at stopover sites used during migration and identify the key contaminants that can impact avian health during this period. The presented results contribute significantly to understanding the year-round exposure of migratory birds to environmental contamination.

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Avian migration clocks in a changing world

Helm,

Liedvogel

2024

J Comp Physiol A

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Avian long-distance migration requires refined programming to orchestrate the birds’ movements on annual temporal and continental spatial scales. Programming is particularly important as long-distance movements typically anticipate future environmental conditions. Hence, migration has long been of particular interest in chronobiology. Captivity studies using a proxy, the shift to nocturnality during migration seasons (i.e., migratory restlessness), have revealed circannual and circadian regulation, as well as an innate sense of direction. Thanks to rapid development of tracking technology, detailed information from free-flying birds, including annual-cycle data and actograms, now allows relating this mechanistic background to behaviour in the wild. Likewise, genomic approaches begin to unravel the many physiological pathways that contribute to migration. Despite these advances, it is still unclear how migration programmes are integrated with specific environmental conditions experienced during the journey. Such knowledge is imminently important as temporal environments undergo rapid anthropogenic modification. Migratory birds as a group are not dealing well with the changes, yet some species show remarkable adjustments at behavioural and genetic levels. Integrated research programmes and interdisciplinary collaborations are needed to understand the range of responses of migratory birds to environmental change, and more broadly, the functioning of timing programmes under natural conditions.

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Physiological challenges of migration

Cited by 7 publications

References 341 publications

Endocrine mechanisms controlling the migratory disposition in birds

Endocrine mechanisms controlling the migratory disposition in birds

Concentration of toxic and essential elements in livers of birds of various foraging guilds collected during the autumn migration period in Poland

Avian migration clocks in a changing world

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