Migratory Birds Advance Spring Arrival and Egg‐Laying in the Arctic, Mostly by Travelling Faster

Global Change Biology, Journal Year: 2025, Volume and Issue: 31(4)

Published: April 1, 2025

ABSTRACT In the current warming climate, many organisms in seasonal environments advance their timing of reproduction to benefit from resource peaks earlier spring. For migrants, potential may be constrained by migration strategies, notably ability arrival at breeding grounds. Recent studies show various changes including wintering closer grounds, departure grounds or faster travels spending less time stopover sites. However, whether such lead remains an open question. We studied and 12 populations nine migratory birds, seabirds, shorebirds, birds prey waterfowl Arctic sites bordering Greenland Barents Sea, a region undergoing rapid climate warming. The was derived tracking field data analysed study (1) how has changed response changing moment snowmelt (2) what adjustments strategies this involved. found that years with early snowmelt, egg‐laying multiple advanced, but only two also advanced Arctic. contrast, generally time, even when dates did not advance. Earlier mostly explained traveling faster, likely Inability forecast conditions limit adjust annually varying we several species, particularly waterfowl, are able travel over years. question reflects adaptations change other factors, for example, environmental along route.

Language: Английский

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Life in the fast and slow lanes: contrasting timing of annual cycle events in high‐ and mid‐latitude breeding Whooper Swans (Cygnus cygnus)

Ibis, Journal Year: 2024, Volume and Issue: unknown

Published: June 28, 2024

Shorter duration of ice‐free conditions at successively northern latitudes increasingly constrains large‐bodied waterbirds from completing their reproductive cycle before freeze‐up, affecting migration and breeding schedules. We compared timing stay in summering areas between 127 tracked East Asian Whooper Swans Cygnus cygnus high latitude (HLP, 67°N, Japan wintering) mid‐latitude (MLP, 48°N, China based on tracking remote‐sensing data. Adult site arrival dates were positively correlated with latitude. HLP adults arrived just 50% snow melt, summered for 142 days (the the period there), over c.130 required to hatch raise cygnets fledging. MLP 3 weeks after c.209 (c.80% total 267 days), laying eggs c.33 arrival. These results suggest that breeders more likely invest stored nutrients energy brought winter quarters and/or enable rapid egg‐laying post‐arrival grounds (a ‘capital’ strategy). By contrast, females appear able obtain most, if not all, energetic nutritional needs exogenously ‘income’ individuals left MLP, but all departed freeze‐up. Migration did differ two groups, so differential summer residency times affected wintering areas. recommend follow‐up investigations relative degree capital/income investment among birds both groups effects respective demographics, population dynamics growth rates.

Language: Английский

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New information on the breeding and moulting ecology of the Eastern population of Lesser White-fronted Goose Anser erythropus from GPS/GSM tracking data

Bird Conservation International, Journal Year: 2025, Volume and Issue: 35

Published: Jan. 1, 2025

Summary The Eastern population of the Lesser White-fronted Goose (EPLWFG) Anser erythropus is shared between Russia and China. summer range EPLWFG has been recognised as a continuous area extending from Olenyok River in west to Anadyr east northwards 64°N. aim this study was provide information on breeding behaviour; nest-sites, nesting habitats, time nesting; success; timing movements including moult migration; timing, duration, moulting habitats; site fidelity; effect human presence. To accomplish this, we combined results field surveys with GPS/GSM tracking. A total 30 tracks 19 individual were analysed. We estimated propensity 93.8% adult LWFG, factor did not seem depend success previous season. Reproductive 13.3% all attempts. Non-breeders arrived three-week later departed week earlier. are highly mobile during summer. core for entire discovered by located along lower reaches San-Yuryakh Kyuanekhtyakh rivers flowing towards Omulyakhskaya Bay East Siberian Sea. flightless period 24.8 ± 2.8 days. part failured (43.7 %) migrated back its early breeding/staging after having completed moult. strong fidelity (100%) birds both sites promotes formation local populations, which could be considered conservation units if genetic studies support differentiation. selects remotest least human-accessible their remigial moult, main help

Language: Английский

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Earlier springs increase goose breeding propensity and nesting success at Arctic but not at temperate latitudes

Journal of Animal Ecology, Journal Year: 2023, Volume and Issue: 92(12), P. 2399 - 2411

Published: Oct. 29, 2023

Intermittent breeding is an important tactic in long-lived species that trade off survival and reproduction to maximize lifetime reproductive success. When conditions are unfavourable, individuals expected skip ensure their own survival. Breeding propensity (i.e. the probability for a mature female breed given year) essential parameter determining output population dynamics, but not often studied birds because it difficult obtain unbiased estimates. especially variable at high latitudes, potentially resulting large effect on of Arctic-breeding migratory birds, such as geese. With novel approach, we used GPS-tracking data determine nest locations, nesting success barnacle geese, how these varied with latitude timing arrival grounds relative local onset spring. Onset spring was better predictor than arrival. At Arctic latitudes (>66° N), decreased from 0.89 (95% CI: 0.65-0.97) early springs 0.22 0.06-0.55) late springs, while temperate between 0.75 0.38-0.93) 0.41-0.99) regardless phenology. Nesting followed similar pattern lower later latitudes. In larger proportion geese started despite arriving spring, possibly enabled them use resources fuel egg laying incubation. While earlier due climate warming considered have mostly negative repercussions through phenological mismatches, our results suggest effects may partly be offset by higher

Language: Английский

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Effects of capture and GPS-tagging in spring on migration timing and reproduction in Pink-footed geese Anser brachyrhynchus

Animal Biotelemetry, Journal Year: 2024, Volume and Issue: 12(1)

Published: April 25, 2024

Abstract Background GPS-transmitters enable detailed study of animal behaviour but may impact the animals. Impacts vary from short-term stress and habituation to longer-term effects on e.g., migration reproduction. To impacts, ideally, true controls (i.e., uncaptured or untagged animals) are used, unbiased assessments their timing breeding performance challenging, especially in remote areas. Alternatively, quasi-controls can be used: individuals tagged longer ago, same later years. Quasi-controls reveal tagging that differ between first following Results We captured Pink-footed geese ( Anser brachyrhynchus ) spring summer deployed GPS-transmitter neckbands. In spring, were caught with cannon clap nets stopovers Norway Finland, 2 weeks before departure areas Svalbard Novaya Zemlya. summer, rounded up during wing moult Svalbard. First, we compared recently 1–4 years prior. Newly migrated significantly later, by days, than previously geese, both at stopover arrival grounds, while duration did not differ. Breeding propensity laying date differ, nesting success tended lowered, resulting a lower annual probability produce hatchlings geese. Second, within advanced next year, suggesting delay spring. This was likely an ageing effect, as showed no advancing over Third, Svalbard, observed brood sizes 1 year after tagging. Conclusions The capture GPS-tagging delayed lowered year. These lasted reported week-long time budgets neck-banding body condition. Additional is needed evaluate permanent which remain undetected quasi-controls.

Language: Английский

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Visual lateralization in the sky: Geese manifest visual lateralization when flying with pair mates

Laterality Asymmetries of Body Brain and Cognition, Journal Year: 2024, Volume and Issue: 29(3), P. 313 - 330

Published: May 3, 2024

The brain's sensory lateralization involves the processing of information from organs primarily in one hemisphere. This can improve brain efficiency by reducing interference and duplication neural circuits. For species that rely on successful interaction among family partners, such as geese, be advantageous. However, at group level, one-sided biases make individuals predictable to competitors predators. We investigated lateral preferences positioning pair mates Greater white-fronted geese

Language: Английский

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Phenology at High Latitudes

Published: Jan. 1, 2024

Language: Английский

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