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  • 1
    Online Resource
    Online Resource
    Moulting season corticosterone correlates with winter season bodyweight in an Arctic migrant bird
    Wiley ; 2021
    In:  Ibis Vol. 163, No. 1 ( 2021-01), p. 113-124
    Details
    In: Ibis, Wiley, Vol. 163, No. 1 ( 2021-01), p. 113-124
    Abstract: In vertebrates, the endocrine system translates environmental changes into physiological responses on which natural selection can act to regulate individual fitness and, ultimately, population dynamics. Corticosterone (CORT) and dehydroepiandrosterone (DHEA) are important regulators of the avian endocrine system but relatively few studies have investigated their downstream effects on key morphological fitness‐related traits in free‐living populations. This study quantified endocrine–morphology relationships in free‐living Greenland Barnacle Geese Branta leucopsis that breed in the high Arctic. CORT and DHEA were extracted from feather and blood samples and tested for relationships with three morphological traits associated with survival and reproduction: bodyweight, body size and facial plumage coloration. We expected CORT concentration to be higher in birds with less favourable morphological traits (i.e. lighter, smaller and less attractive) and DHEA to be higher in birds with more favourable traits (i.e. heavier, bigger and more attractive). As expected, individuals with higher CORT during the post‐breeding moult (July/August) had significantly lower bodyweight during the following winter (November–April). In contrast, we found no robust DHEA–morphology relationships and no statistically significant relationship between CORT and body size or facial plumage. Overall, this study provides evidence of a negative relationship between CORT and bodyweight extending across different seasons of the annual cycle in a long‐distance migrant. This is of particular interest because bodyweight fluctuates rapidly in response to environmental resources and is closely linked to both survival and reproductive success in this species. Understanding the relationship between CORT and key morphological traits is important because endocrine‐disrupting contaminants in the Arctic increasingly interfere with CORT function in birds, including Barnacle Geese, and based on the results of this study may have consequences for bodyweight regulation.
    Type of Medium: Online Resource
    ISSN: 0019-1019 , 1474-919X
    URL: Issue
    URL: Article
    DOI: 10.1111/ibi.v163.1
    DOI: 10.1111/ibi.12876
    Language: English
    Publisher: Wiley
    Publication Date: 2021
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    detail.hit.zdb_id: 2807-1
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    Time-varying effects of local weather on behavior and probability of breeding deferral in two Arctic-nesting goose populations
    Springer Science and Business Media LLC ; 2023
    In:  Oecologia Vol. 201, No. 2 ( 2023-02), p. 369-383
    Details
    In: Oecologia, Springer Science and Business Media LLC, Vol. 201, No. 2 ( 2023-02), p. 369-383
    Abstract: Arctic-nesting geese face energetic challenges during spring migration, including ecological barriers and weather conditions (e.g., precipitation and temperature), which in long-lived species can lead to a trade-off to defer reproduction in favor of greater survival. We used GPS location and acceleration data collected from 35 greater white-fronted geese of the North American midcontinent and Greenland populations at spring migration stopovers, and novel applications of Bayesian dynamic linear models to test daily effects of minimum temperature and precipitation on energy expenditure (i.e., overall dynamic body acceleration, ODBA) and proportion of time spent feeding (PTF), then examined the daily and additive importance of ODBA and PTF on probability of breeding deferral using stochastic antecedent models. We expected distinct responses in behavior and probability of breeding deferral between and within populations due to differences in stopover area availability. Time-varying coefficients of weather conditions were variable between ODBA and PTF, and often did not show consistent patterns among birds, indicating plasticity in how individuals respond to conditions. An increase in antecedent ODBA was associated with a slightly increased probability of deferral in midcontinent geese but not Greenland geese. Probability of deferral decreased with increased PTF in both populations. We did not detect any differentially important time periods. These results suggest either that movements and behavior throughout spring migration do not explain breeding deferral or that ecological linkages between bird decisions during spring and subsequent breeding deferral were different between populations and across migration but occurred at different time scales than those we examined.
    Type of Medium: Online Resource
    ISSN: 0029-8549 , 1432-1939
    URL: Article
    DOI: 10.1007/s00442-022-05300-x
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
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    detail.hit.zdb_id: 123369-5
    SSG: 12
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  • 3
    Online Resource
    Online Resource
    Adult survival and per‐capita production of young explain dynamics of a long‐lived goose population
    Wiley ; 2022
    In:  Ibis Vol. 164, No. 2 ( 2022-04), p. 574-580
    Details
    In: Ibis, Wiley, Vol. 164, No. 2 ( 2022-04), p. 574-580
    Abstract: Population growth rates in geese can be sensitive to small changes in survival and/or production of young, and understanding which demographic rates explain more variation in population change can be crucial for implementing effective conservation actions. Here, we show that annual adult survival and production of young (assessed in winter) explained most variation in annual population growth rate across 36 years in Greenland White‐fronted Geese Anser albifrons flavirostris , during which time the population showed a sustained increase followed by a decline. In contrast, there was no strong relationship between annual population growth rate and juvenile survival following autumn migration, suggesting that variation in this demographic parameter contributed little to the population trajectory over the same period. Quantifying the influence of decisions made by Greenland White‐fronted Geese throughout the annual cycle will improve our ability to target seasonal conservation actions that reduce adult mortality and/or increase production of young where possible.
    Type of Medium: Online Resource
    ISSN: 0019-1019 , 1474-919X
    URL: Issue
    URL: Article
    DOI: 10.1111/ibi.v164.2
    DOI: 10.1111/ibi.13013
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 2071870-6
    detail.hit.zdb_id: 2807-1
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  • 4
    Online Resource
    Online Resource
    Differing drivers of decline within a migratory metapopulation has implications for future conservation
    Wiley ; 2023
    In:  Ecology and Evolution Vol. 13, No. 7 ( 2023-07)
    Details
    In: Ecology and Evolution, Wiley, Vol. 13, No. 7 ( 2023-07)
    Abstract: Researchers generally ascribe demographic drivers in a single sub‐population and presume they are representative. With this information, practitioners implement blanket conservation measures across metapopulations to reverse declines. However, such approaches may not be appropriate in circumstances where sub‐populations are spatiotemporally segregated and exposed to different environmental variation. The Greenland White‐fronted Goose, Anser albifrons flavirostris , is an Arctic‐nesting migrant that largely comprises two sub‐populations (delineated by northerly and southerly breeding areas in west Greenland). The metapopulation has declined since 1999 but this trend is only mirrored in one sub‐population and the causes of this disparity are unclear. Here we compare the drivers and trends of productivity in both sub‐populations using population‐ and individual‐level analysis. We examined how temperature and precipitation influenced population‐level reproductive success over 37 years and whether there was a change in the relationship when metapopulation decline commenced. In addition, we used biologging devices to remotely classify incubation events for 86 bird‐years and modelled how phenology and environmental conditions influenced individual‐level nest survival. Correlations between reproductive success and temperature/precipitation on the breeding grounds have weakened for both sub‐populations. This has resulted in lower reproductive success for the northerly, but not southerly breeding sub‐population, which at the individual‐level appears to be driven by lower nest survival. Earlier breeding ground arrival and less precipitation during incubation increased nest survival in the northerly breeding population, while no factors examined were important for the southerly breeding sub‐population. This suggests reproductive success is driven by different factor(s) in the two sub‐populations. Demographic rates and their environmental drivers differ between the sub‐populations examined here and consequently we encourage further decomposition of demography within metapopulations. This is important for conservation practitioners to consider as bespoke conservation strategies, targeting different limiting factors, may be required for different sub‐populations.
    Type of Medium: Online Resource
    ISSN: 2045-7758 , 2045-7758
    URL: Issue
    URL: Article
    DOI: 10.1002/ece3.v13.7
    DOI: 10.1002/ece3.10281
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2635675-2
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  • 5
    Online Resource
    Online Resource
    Energetic trade-offs in migration decision-making, reproductive effort and subsequent parental care in a long-distance migratory bird
    The Royal Society ; 2024
    In:  Proceedings of the Royal Society B: Biological Sciences Vol. 291, No. 2017 ( 2024-02-28)
    Details
    In: Proceedings of the Royal Society B: Biological Sciences, The Royal Society, Vol. 291, No. 2017 ( 2024-02-28)
    Abstract: Migratory species trade-off long-distance movement with survival and reproduction, but the spatio-temporal scales at which these decisions occur are relatively unknown. Technological and statistical advances allow fine-scale study of animal decision-making, improving our understanding of possible causes and therefore conservation management. We quantified effects of reproductive preparation during spring migration on subsequent breeding outcomes, breeding outcomes on autumn migration characteristics and autumn migration characteristics on subsequent parental survival in Greenland white-fronted geese ( Anser albifrons flavirostris ). These are long-distance migratory birds with an approximately 50% population decline from 1999 to 2022. We deployed GPS-acceleration devices on adult females to quantify up to 5 years of individual decision-making throughout the annual cycle. Weather and habitat-use affected time spent feeding and overall dynamic body acceleration (i.e. energy expenditure) during spring and autumn. Geese that expended less energy and fed longer during spring were more likely to successfully reproduce. Geese with offspring expended more energy and fed for less time during autumn, potentially representing adverse fitness consequences of breeding. These behavioural comparisons among Greenland white-fronted geese improve our understanding of fitness trade-offs underlying abundance. We provide a reproducible framework for full annual cycle modelling using location and behaviour data, applicable to similarly studied migratory animals.
    Type of Medium: Online Resource
    ISSN: 0962-8452 , 1471-2954
    URL: Article
    DOI: 10.1098/rspb.2023.2016
    Language: English
    Publisher: The Royal Society
    Publication Date: 2024
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    detail.hit.zdb_id: 209242-6
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    SSG: 25
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  • 6
    Online Resource
    Online Resource
    Temperature and precipitation at migratory grounds influence demographic trends of an Arctic‐breeding bird
    Wiley ; 2020
    In:  Global Change Biology Vol. 26, No. 10 ( 2020-10), p. 5447-5458
    Details
    In: Global Change Biology, Wiley, Vol. 26, No. 10 ( 2020-10), p. 5447-5458
    Abstract: Anthropogenic climate disruption, including temperature and precipitation regime shifts, has been linked to animal population declines since the mid‐20th century. However, some species, such as Arctic‐breeding geese, have thrived during this period. An increased understanding of how climate disruption might link to demographic rates in thriving species is an important perspective in quantifying the impact of anthropogenic climate disruption on the global state of nature. The Greenland barnacle goose ( Branta leucopsis ) population has increased tenfold in abundance since the mid‐20th century. A concurrent weather regime shift towards warmer, wetter conditions occurred throughout its range in Greenland (breeding), Ireland and Scotland (wintering) and Iceland (spring and autumn staging). The aim of this study was to determine the relationship between weather and demographic rates of Greenland barnacle geese to discern the role of climate shifts in the population trend. We quantified the relationship between temperature and precipitation and Greenland barnacle goose survival and productivity over a 50 year period from 1968 to 2018. We detected significant positive relationships between warmer, wetter conditions on the Icelandic spring staging grounds and survival. We also detected contrasting relationships between warmer, wetter conditions during autumn staging and survival and productivity, with warm, dry conditions being the most favourable for productivity. Survival increased in the latter part of the study period, supporting the possibility that spring weather regime shifts contributed to the increasing population trend. This may be related to improved forage resources, as warming air temperatures have been shown to improve survival rates in several other Arctic and northern terrestrial herbivorous species through indirect bottom‐up effects on forage availability.
    Type of Medium: Online Resource
    ISSN: 1354-1013 , 1365-2486
    URL: Issue
    URL: Article
    DOI: 10.1111/gcb.v26.10
    DOI: 10.1111/gcb.15267
    Language: English
    Publisher: Wiley
    Publication Date: 2020
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    detail.hit.zdb_id: 2020313-5
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  • 7
    Online Resource
    Online Resource
    Home range of a long-distance migrant, the Greenland Barnacle Goose Branta leucopsis , throughout the annual cycle
    Informa UK Limited ; 2023
    In:  Bird Study Vol. 70, No. 1-2 ( 2023-04-03), p. 37-46
    Details
    In: Bird Study, Informa UK Limited, Vol. 70, No. 1-2 ( 2023-04-03), p. 37-46
    Type of Medium: Online Resource
    ISSN: 0006-3657 , 1944-6705
    URL: Article
    DOI: 10.1080/00063657.2023.2191924
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2023
    detail.hit.zdb_id: 2093767-2
    detail.hit.zdb_id: 950993-8
    SSG: 12
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