Population regulation in a sub-Arctic wader: insights from variation in breeding density
Population numbers result from the combined effect of exogenous (weather, food, predation, anthropogenic impact) and endogenous (behaviour, density) factors on the population, which often act simultaneously resulting in spatial variation in population distribution and density. The effects of these f...
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University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences
2024
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Online Access: | https://hdl.handle.net/20.500.11815/4926 |
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ftopinvisindi:oai:opinvisindi.is:20.500.11815/4926 2024-06-23T07:48:22+00:00 Population regulation in a sub-Arctic wader: insights from variation in breeding density Cerezo-Araujo, Maite Tómas Grétar Gunnarsson; José Augusto Alves; Verónica Méndez; Gunnar Thor Hallgrímsson Líf- og umhverfisvísindadeild (HÍ) Faculty of Life and Environmental Sciences (UI) Verkfræði- og náttúruvísindasvið (HÍ) School of Engineering and Natural Sciences (UI) Háskóli Íslands University of Iceland 2024-05 163 https://hdl.handle.net/20.500.11815/4926 en eng University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences Cerezo-Araujo, M. 2024. Population regulation in a sub-Arctic wader: insights from variation in breeding density. PhD thesis. 978-9935-9769-0-1 https://hdl.handle.net/20.500.11815/4926 info:eu-repo/semantics/embargoedAccess Líffræði (námsgrein) Stofnstærð (vistfræði) Vaðfuglar Spói Doktorsritgerðir Búsvæði Whimbrel Population dynamics Habitat quality Density dependence Numenius phaeopus info:eu-repo/semantics/doctoralThesis 2024 ftopinvisindi https://doi.org/20.500.11815/4926 2024-06-03T23:36:06Z Population numbers result from the combined effect of exogenous (weather, food, predation, anthropogenic impact) and endogenous (behaviour, density) factors on the population, which often act simultaneously resulting in spatial variation in population distribution and density. The effects of these factors can mask each other and operate across different spatiotemporal scales making the study of population regulation challenging. Studies on variation in demography and habitat quality across gradients in breeding density can give important insights into population regulation. The largest lowland basin in Iceland has a unique gradient of wader breeding density, an ideal setting for population regulation studies. Using the variation in Whimbrel, Numenius phaeopus, abundance recorded during a long-term monitoring programme and a three-year study in South Iceland, I aimed to better understand the possible mechanisms regulating this population. To do so, I investigated population trends and the relationships between demographic processes, habitat features, and behaviour of this species. Adult abundance decreased from 2012-2021 possibly due to habitat degradation. Brood abundance did not show a trend (2013-2021) but showed high environmental variability. Adults used a variety of semi-natural habitats, and their annual abundance was not directly explained by the process of ecological succession, potential prey abundance, or potential predator pressure. Adult numbers influenced the frequency of the aerial display behaviour with Whimbrels displaying more often at low densities during pre-incubation, probably for mate attraction. Displaying at all densities occurred during the rest of the breeding season and may serve other functions such as resource defence. Broods avoided areas of anthropogenic origin, and some semi-natural habitats were more important than others during chick-rearing and migration preparation. Food availability is likely a driver of variation in habitat quality and more broods were produced at a higher ... Doctoral or Postdoctoral Thesis Arctic Arctic Iceland Numenius phaeopus Whimbrel Opin vísindi (Iceland) Arctic |
institution |
Open Polar |
collection |
Opin vísindi (Iceland) |
op_collection_id |
ftopinvisindi |
language |
English |
topic |
Líffræði (námsgrein) Stofnstærð (vistfræði) Vaðfuglar Spói Doktorsritgerðir Búsvæði Whimbrel Population dynamics Habitat quality Density dependence Numenius phaeopus |
spellingShingle |
Líffræði (námsgrein) Stofnstærð (vistfræði) Vaðfuglar Spói Doktorsritgerðir Búsvæði Whimbrel Population dynamics Habitat quality Density dependence Numenius phaeopus Cerezo-Araujo, Maite Population regulation in a sub-Arctic wader: insights from variation in breeding density |
topic_facet |
Líffræði (námsgrein) Stofnstærð (vistfræði) Vaðfuglar Spói Doktorsritgerðir Búsvæði Whimbrel Population dynamics Habitat quality Density dependence Numenius phaeopus |
description |
Population numbers result from the combined effect of exogenous (weather, food, predation, anthropogenic impact) and endogenous (behaviour, density) factors on the population, which often act simultaneously resulting in spatial variation in population distribution and density. The effects of these factors can mask each other and operate across different spatiotemporal scales making the study of population regulation challenging. Studies on variation in demography and habitat quality across gradients in breeding density can give important insights into population regulation. The largest lowland basin in Iceland has a unique gradient of wader breeding density, an ideal setting for population regulation studies. Using the variation in Whimbrel, Numenius phaeopus, abundance recorded during a long-term monitoring programme and a three-year study in South Iceland, I aimed to better understand the possible mechanisms regulating this population. To do so, I investigated population trends and the relationships between demographic processes, habitat features, and behaviour of this species. Adult abundance decreased from 2012-2021 possibly due to habitat degradation. Brood abundance did not show a trend (2013-2021) but showed high environmental variability. Adults used a variety of semi-natural habitats, and their annual abundance was not directly explained by the process of ecological succession, potential prey abundance, or potential predator pressure. Adult numbers influenced the frequency of the aerial display behaviour with Whimbrels displaying more often at low densities during pre-incubation, probably for mate attraction. Displaying at all densities occurred during the rest of the breeding season and may serve other functions such as resource defence. Broods avoided areas of anthropogenic origin, and some semi-natural habitats were more important than others during chick-rearing and migration preparation. Food availability is likely a driver of variation in habitat quality and more broods were produced at a higher ... |
author2 |
Tómas Grétar Gunnarsson; José Augusto Alves; Verónica Méndez; Gunnar Thor Hallgrímsson Líf- og umhverfisvísindadeild (HÍ) Faculty of Life and Environmental Sciences (UI) Verkfræði- og náttúruvísindasvið (HÍ) School of Engineering and Natural Sciences (UI) Háskóli Íslands University of Iceland |
format |
Doctoral or Postdoctoral Thesis |
author |
Cerezo-Araujo, Maite |
author_facet |
Cerezo-Araujo, Maite |
author_sort |
Cerezo-Araujo, Maite |
title |
Population regulation in a sub-Arctic wader: insights from variation in breeding density |
title_short |
Population regulation in a sub-Arctic wader: insights from variation in breeding density |
title_full |
Population regulation in a sub-Arctic wader: insights from variation in breeding density |
title_fullStr |
Population regulation in a sub-Arctic wader: insights from variation in breeding density |
title_full_unstemmed |
Population regulation in a sub-Arctic wader: insights from variation in breeding density |
title_sort |
population regulation in a sub-arctic wader: insights from variation in breeding density |
publisher |
University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences |
publishDate |
2024 |
url |
https://hdl.handle.net/20.500.11815/4926 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Iceland Numenius phaeopus Whimbrel |
genre_facet |
Arctic Arctic Iceland Numenius phaeopus Whimbrel |
op_relation |
Cerezo-Araujo, M. 2024. Population regulation in a sub-Arctic wader: insights from variation in breeding density. PhD thesis. 978-9935-9769-0-1 https://hdl.handle.net/20.500.11815/4926 |
op_rights |
info:eu-repo/semantics/embargoedAccess |
op_doi |
https://doi.org/20.500.11815/4926 |
_version_ |
1802638784912687104 |