The urge to breed early: Similar responses to environmental conditions in short‐ and long‐distance migrants during spring migration

Ecology and Evolution, Journal Year: 2023, Volume and Issue: 13(7)

Published: July 1, 2023

Birds migrating different distances experience temporal, energetic, physiological, and physical constraints throughout migration, which is reflected in their migration strategy. Consequently, we predict behavioral decisions to similar environmental cues between short- long-distance migrants, has been documented for autumn migration. Here, focus on the question whether trade-off regarding departure, routing, landing when alternating migratory endurance flights stopovers also differ during spring As early arrivals at breeding grounds should be ultimately favored regardless of distance, selection may favor more than autumn. We radio-tagged songbirds stopover sites along German North Sea coast automatically tracked behavior using a large-scale network receiver stations. Once departed, birds could either cross sea or detour coast. corrected spatially biased detection data, hierarchical multistate model assess how respond variation conditions day-to-day departure route selection. The probability was higher migrants independently routing decision. Irrespective all species likely departed under light winds rainless conditions, while influence air pressure change relative humidity species-specific. By accounting probabilities, estimated that about half individuals each crossed but did not find differences migrants. Offshore were blew offshore began earlier within night compared with onshore flights. Our results suggest similarly affects These findings put toward ultimate mechanisms shape differently seasons.

Language: Английский

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The oxidative balance and stopover departure decisions in a medium- and a long-distance migrant

Movement Ecology, Journal Year: 2023, Volume and Issue: 11(1)

Published: Feb. 6, 2023

Birds have extremely elevated metabolic rates during migratory endurance flight and consequently can become physiologically exhausted. One feature of exhaustion is oxidative damage, which occurs when the antioxidant defense system overwhelmed by production damaging reactive oxygen species (ROS). Migrating birds been shown to decrease amount lipid damage stopovers, relatively stationary periods in between flights. It has therefore argued that, addition accumulating fuel, one functions stopover restore balance. If this so, we would expect that migrating are unlikely resume migration from they still high amounts damage.To test hypothesis, measured parameters balance related these departure decisions song thrushes (Turdus philomelos) northern wheatears (Oenanthe oenanthe), a medium- long-distance songbird migrant, respectively. We malondialdehyde (MDA) concentration, biomarker for total non-enzymatic capacity (AOX), an overall protection against ROS. Stopover were determined using fully automated telemetry set-up on our small island study site.The decision was not with MDA concentration either species, also corrected circulating fatty acid concentrations. Similarly, AOX did affect decision, uric-acid concentration. The time within night departed affected or AOX. However, confirming earlier observations, found both fat individuals more likely depart than lean individuals, conspecifics. Northern additionally spring southerly winds.We no support idea stopovers influenced discuss possible reasons unexpected finding.

Language: Английский

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Evolutionary integration of the geography and pacing of the annual cycle in migratory birds

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: March 12, 2024

Abstract In migratory species, the temporal phases of annual cycle are intrinsically linked to seasonally shifting geographic ranges. Despite intense interest in ecology migration, a synthetic understanding relationship between biogeography and phenology seasonal migration remains elusive. Here, we interrogate spatiotemporal structure novel phylogenetic comparative framework. We use eBird, massive avian occurrence dataset, demarcate measure consistent manner among species portions when distribution is stationary versus dynamic due migration. Through analyses durations stages for 150 birds breeding North America, show that duration periods remarkably unrelated distance nonbreeding locations. other words, distributions long-distance migrants shift their geographically distant same amount time as short-distance migrants, suggesting individuals have more synchronous likely faster individual pace than migrants. Our results further spends on grounds strongly inversely related spent grounds, revealing length period be primary source species-level variation pacing cycle, opposed needed period. Further, our study reveals annually predicts locations, demonstrating key linkages its phenology, evolution life history tradeoffs.

Language: Английский

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Molecular changes and physiological responses involved in migratory bird fuel management and stopover decisions

Journal of Experimental Zoology Part A Ecological and Integrative Physiology, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 6, 2024

Abstract Migratory birds undertake long journeys across continents to reach breeding habitats with abundant resources. These migrations are essential for their survival and shaped by a complex interplay of physiological adaptations, behavioral cues, gene expression patterns. Central migration stopovers, critical resting points where replenish energy stores before continuing journey. In this study, we integrate measurements, observations, molecular data from temporarily caged migrating Garden Warblers ( Sylvia borin ) gain insights into stopover strategies adaptations after crossing the extended ecological barrier formed Sahara Desert Mediterranean Sea. Depleted individuals, marked low body mass flight muscle mass, showcased remarkable plasticity in recovering rapidly rebuilding within short 5‐day stopover. Flight increased during period, highlighting dynamic trade‐off between refuelling. Notably, prioritizing exhibited downregulation genes related lipid transport metabolism at same time showing evidence skeletal angiogenesis. Early arrivals were more motivated depart higher levels stress. Our study highlights importance understanding adaptive responses changing environmental conditions along routes.

Language: Английский

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Anthropogenic food subsidies reshape the migratory behaviour of a long-distance migrant

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 858, P. 159992 - 159992

Published: Nov. 7, 2022

Bird migratory journeys are often long and hostile, requiring high energetic expenditure, thus forcing birds to pause between flights. Stopover sites allow migrants replenish fuel reserves rest, being crucial for the success of migration. Worldwide, increasing accumulation waste on landfills rubbish dumps has been described provide superabundant food resources many bird species not only during breeding wintering seasons but also migration, used as stopover sites. Using GPS-tracking data juvenile white storks (Ciconia ciconia) their first migration from Iberia Peninsula sub-Saharan grounds, we uncover effects stopping en route individual performance. Particularly, examine benefits at artificial (landfills dumps) when compared natural (wetlands, agricultural or desert areas) explore influence anthropogenic storks' strategies. Overall, spent up one-third in stopovers. We found that stopped longer periods made more detours, duration by half a day each day. Stopping did reflect in-flight efficiency nor likelihood completing Juvenile 80 % days, spending 45 less time 10 energy foraging than using While translate into differences performance, individuals poor body condition possibly rely these improve weight before proceeding, enabling them successfully complete Artificial attractive likely increase number stops storks. Even though consequences arriving late grounds unknown, it can lead cascading consequences, influencing fitness population dynamics.

Language: Английский

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