Browsing by Author "Yoccoz, Nigel Gilles"

Now showing items 41-52 of 52

    • A screening for canine distemper virus, canine adenovirus and carnivore protoparvoviruses in Arctic foxes (Vulpes lagopus) and red foxes (Vulpes vulpes) from Arctic and sub-Arctic regions of Norway 

      Tryland, Morten; Balboni, Andrea; Killengreen, Siw Turid; Mørk, Torill; Nielsen, Ole; Yoccoz, Nigel Gilles; Ims, Rolf Anker; Fuglei, Eva (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-26)
      Canine distemper virus (CDV), canine adenovirus (CAdV) and canine parvovirus type 2 (CPV-2) cause disease in dogs (Canis familiaris). These, or closely related viruses, may also infect wild carnivores. The aim of this study was to investigate exposure to CDV, CAdV and CPV-2 among fox populations in Norway. Arctic foxes (n = 178) from High-Arctic Svalbard were investigated for antibodies against CDV. ...

    • Seasonal difference in temporal transferability of an ecological model: near-term predictions of lemming outbreak abundances 

      Kleiven, Eivind Flittie; Henden, John-André; Ims, Rolf Anker; Yoccoz, Nigel Gilles (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-15)
      Ecological models have been criticized for a lack of validation of their temporal transferability. Here we answer this call by investigating the temporal transferability of a dynamic state-space model developed to estimate season-dependent biotic and climatic predictors of spatial variability in outbreak abundance of the Norwegian lemming. Modelled summer and winter dynamics parametrized by spatial ...

    • Snowmelt progression drives habitat selection and vegetation disturbance by an Arctic avian herbivore 

      Eischeid, Isabell; Madsen, Jesper; Ims, Rolf Anker; Nolet, Bart A.; Pedersen, Åshild Ønvik; Schreven, Kees H.T.; Soininen, Eeva Marjatta; Yoccoz, Nigel Gilles; Ravolainen, Virve (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-12-17)
      Arctic tundra vegetation is affected by rapid climatic change and fluctuating herbivore population sizes. Broad-billed geese, after their arrival in spring, feed intensively on belowground rhizomes, thereby disturbing soil, mosses, and vascular plant vegetation. Understanding of how springtime snowmelt patterns drive goose behavior is thus key to better predict the state of Arctic tundra ecosystems. ...

    • Sources of variation in small rodent trophic niche: New insights from DNA metabarcoding and stable isotope analysis 

      Soininen, Eeva M; Ehrich, Dorothee; Lecomte, Nicolas; Yoccoz, Nigel Gilles; Tarroux, Arnaud; Berteaux, Dominique; Gauthier, Gilles; Gielly, Ludovic; Brochmann, Christian; Gussarova, Galina; Ims, Rolf Anker (Journal article; Tidsskriftartikkel; Peer reviewed, 2014-05-15)

    • Spatial synchrony in sub-arctic geometrid moth outbreaks reflects dispersal in larval and adult life cycle stages 

      Vindstad, Ole Petter Laksforsmo; Jepsen, Jane Uhd; Yoccoz, Nigel Gilles; Bjørnstad, Ottar Nordal; Mesquita, Michel d. S.; Ims, Rolf Anker (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-02-08)
      <OL> <LI>Spatial synchrony in population dynamics can be caused by dispersal or spatially correlated variation in environmental factors like weather (Moran effect). Distinguishing between these mechanisms is challenging for natural populations, and the study of dispersal‐induced synchrony in particular has been dominated by theoretical modelling and laboratory experiments. <LI>The goal of the ...

    • The spectacular human nose: An amplifier of individual quality? 

      Mikalsen, Åse Kristine Rognmo; Folstad, Ivar; Yoccoz, Nigel Gilles; Laeng, Bruno (Journal article; Tidsskriftartikkel; Peer reviewed, 2014)

    • Stakeholder Perspectives on Triage in Wildlife Monitoring in a Rapidly Changing Arctic 

      Wheeler, Helen Claire; Berteaux, Dominique; Furgal, Chris; Parlee, Brenda; Yoccoz, Nigel Gilles; Grémillet, David (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-11-15)
      Monitoring activities provide a core contribution to wildlife conservation in the Arctic. Effective monitoring which allows changes in population status to be detected early provides opportunities to mitigate pressures driving declines. Monitoring triage involves decisions about how and where to prioritize activities in species and ecosystem based monitoring. In particular, monitoring triage examines ...

    • Temporal trend of mercury in relation to feeding habits and food availability in arctic foxes (Vulpes lagopus) from Svalbard, Norway 

      Hallanger, Ingeborg G.; Fuglei, Eva; Yoccoz, Nigel Gilles; Pedersen, Åshild Ønvik; König, Max; Routti, Heli Anna Irmeli (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-03-20)
      We investigated the temporal trend of mercury (Hg) in arctic foxes from Svalbard, Norway sampled in the period 1997–2014 (<i>n</i> = 109, from 11 trapping seasons). We used linear models to investigate the effect of trapping season, feeding habits (δ<sup>13</sup>C), food availability from marine and terrestrial ecosystems (reindeer carcasses and sea ice cover), sex, age and body condition on liver ...

    • Toward understanding the effect of top predators on ecosystems 

      Lecomte, Nicolas A Francis; Ehrich, Dorothee; Ims, Rolf Anker; Yoccoz, Nigel Gilles (Journal article; Tidsskriftartikkel, 2009)
      To what extent top predators - carnivores at the top of food chains - drive or just respond to ecosystem dynamics is a central, but partially unresolved, question in ecology. In this report, we highlight how different research approaches employed in aquatic and terrestrial ecology may have a bearing on how the role of top predators in ecosystems is perceived.

    • Transferability of biotic interactions: temporal consistency of arctic plant-rodent relationships is poor 

      Soininen, Eeva M; Henden, John-André; Ravolainen, Virve; Yoccoz, Nigel Gilles; Bråthen, Kari Anne; Killengreen, Siw Turid; Ims, Rolf Anker (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-09-17)
      Variability in biotic interaction strength is an integral part of food web functioning. However, the consequences of the spatial and temporal variability of biotic interactions are poorly known, in particular for predicting species abundance and distribution. The amplitude of rodent population cycles (i.e., peak-phase abundances) has been hypothesized to be determined by vegetation properties ...

    • Ungulate population monitoring in an open tundra landscape: distance sampling versus total counts 

      Le Moullec, Mathilde; Pedersen, Åshild Ønvik; Yoccoz, Nigel Gilles; Aanes, Ronny; Tufto, Jarle; Hansen, Brage Bremset (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-07-27)
      Researchers and wildlife managers strive for low bias and high precision (i.e. high accuracy) when estimating animal population sizes. Distance sampling is currently one of the most widely used monitoring methods. However, it relies on strict sampling designs and modeling assumptions that can be difficult to meet in the field. Here, we use data from two sub-populations of non-migratory wild Svalbard ...

    • Warm temperatures during cold season can negatively affect adult survival in an alpine bird 

      Chiffard, Jules; Delestrade, Anne; Yoccoz, Nigel Gilles; Loison, Anne; Besnard, Aurelien (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-25)
      Climate seasonality is a predominant constraint on the lifecycles of species in alpine and polar biomes. Assessing the response of these species to climate change thus requires taking into account seasonal constraints on populations. However, interactions between seasonality, weather fluctuations, and population parameters remain poorly explored as they require long‐term studies with high sampling ...