Freydis Vigfusdottir

Freydis Vigfusdottir
Ministry of Food, Agriculture and Fisheries · Department of Sustainability and Environment

Doctor of Philosophy

About

13
Publications
2,295
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110
Citations
Citations since 2017
7 Research Items
82 Citations
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Introduction
My research interests lie in the field of spatial and trophic ecology of animals and current research is focused on foraging ecology of marine animals and influences of marine resource limitations on arctic and subarctic ecosystems as well as studies on stress associated with disturbance and risk behaviours of long-distance migrants.

Publications

Publications (13)
Article
Full-text available
During the breeding season, seabirds are central place foragers and in order to successfully rear chicks they must adjust their foraging behaviours to compensate for extrinsic factors. When foraging, arctic terns Sterna paradisaea are restricted to the first 50 cm of the water column and can only carry a few prey items back to their nests at once....
Article
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Seabirds can play a vital role in primary succession by transferring nutrients from sea to land. Here, we examine the effects of sparse seabird colonies on primary succession at the Breiðamerkurjökull glacial fore-field in SE-Iceland. The area is generally characterized by low vegetation cover, where mosses are dominant, with scattered, grassy vege...
Article
Full-text available
Sex-specific niche differentiation is common in marine vertebrates, but how this varies long-term is poorly understood. Here we investigated interannual variation in sexual segregation among breeding northern gannets Morus bassanus, wide-ranging central-place foragers with slight sexual dimorphism. Over 11 breeding seasons, we used GPS tracking and...
Article
Full-text available
1.Physiological processes, including those that disrupt oxidative balance, have been proposed as key to understanding fundamental life history trade‐offs. Yet examination of changes in oxidative balance within wild animals across time, space and major life history challenges remain uncommon. For example, migration presents substantial physiological...
Article
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Fisheries produce large amounts of waste, providing food subsidies for scavengers. Discards influence seabird movement, demography and community structure, but little is known about seabird-fishery interactions where discarding is banned. Here, we investigate how northern gannets Morus bassanus respond to fishing vessels in Iceland, where discardin...
Article
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Oxidative stress is a likely consequence of hard physical exertion and thus a potential mediator of life-history trade-offs in migratory animals. However, little is known about the relative importance of intrinsic and extrinsic stres-sors on the oxidative state of individuals in wild populations. We quantified the relationships between air temperat...
Article
Full-text available
The manner in which patterns of variation and interactions among demographic rates contribute to population growth rate (λ) are key to understanding how animal populations will respond to changing climatic conditions. Migratory species are likely to be particularly sensitive to climatic conditions as they experience a range of different environment...
Article
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Capsule Recent annual productivity of Arctic Terns Sterna paradisaea in Iceland has been persistently low, primarily because of very low rates of chick fledging. Aims To quantify current levels of productivity in Arctic Terns in Iceland, and the extent to which this varies among 10 colonies across the Snaefellsnes peninsula, West Iceland. Methods B...
Preprint
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Diets of Northern Gannet in Iceland At present about 8% of the world population of the Northern Gannet Morus bassanus breed in Iceland. However, only anecdotal evidence has been available on the diet of Gannets in Icelandic waters. Here we present data on summer diets of the species at three localities (Fig. 1, Table 1). We analysed nine stomach co...
Article
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Recent hybridization has been reported between the Herring Gull (Larus argentatus) and Glaucous Gull (Larus hyperboreus; the larger of the species) in Iceland, after the arrival of Herring Gulls around 1925. We used samples of both species from various locations in Iceland and from three periods spanning >40 years. To analyze the nature of hybridiz...
Article
Full-text available
Large white-headed gulls provide an interesting group of birds for studies of hybridization. The group is composed of 20 species of recent origin, often with weak reproductive barriers. Here we report the results from a study on the glaucous gull Larus hyperboreus, an Arctic species which has been breeding in Iceland for centuries, and the herring...

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Projects

Projects (2)
Project
The goal of this study is conduct an interdisciplinary study that will form the building blocks for linking economic data to stock assessment modelling. A location choice model will link fisher behaviour in cod fishing with exogenous factors such as prices of inputs and outputs, vessel type, season and biological attributes of the cod itself, which varies from fish to fish and depends on stock properties, season, gear and location. To do so, biological attributes of Icelandic cod will need to be analysed spatially and over time, as will the relationship between these attributes and prices in Icelandic fish auction markets. Finally, a fishing location choice model will be built and specified using logbook data. The model will be designed such that market influences on targeted biological traits (e.g., consumer preferences, processing constraints, timing of fishing) can be directly linked to a stock assessment model. It would then be possible to analyse the feedback between market influences and population processes, a highly innovative and useful task for the refinement of fisheries management.