Blar i forfatter "Henden, John-André"

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    • Fjellrev i Finnmark: Årsrapport 2009 

      Ims, Rolf Anker; Mørk, Torill; Sarre, Arne Petter; Killengreen, Siw Turid; Knutsen, Kjartan; Jensvoll, Ingrid; Yoccoz, Nigel Gilles; Ørjebu, Alfred; Henden, John-André (Research report; Forskningsrapport, 2009)

    • Fjellrev i Finnmark” - Rapport for perioden 2008-2012. 

      Killengreen, Siw Turid; Ims, Rolf Anker; Henden, John-André; Yoccoz, Nigel; Ehrich, Dorothee (Research report; Forskningsrapport, 2013)
      Som et av to prosjekter i en stor nasjonal satsning for å redde den utrydningstruede fjellreven, ble «Fjellrev i Finnmark» startet opp våren 2004. Prosjektet har fra starten av hatt to hovedmålsettinger. 1)Å gjøre grunnleggende forskning på økosystembetingelser som begrenser fjellrevenbestandens nåværende utbredelse og bestandsvekst i Øst-Finnmark spesielt, og i sub- & lav-Arktis generelt, med ...

    • Food web approach for managing Arctic wildlife populations in an era of rapid environmental change 

      Mellard, Jarad; Henden, John-André; Pedersen, Åshild Ønvik; Marolla, Filippo; Hamel, Sandra; Yoccoz, Nigel; Ims, Rolf Anker (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-28)
      Scientists and wildlife managers implementing adaptive monitoring and management schemes, are tasked with providing predictions of population responses to harvest and environmental changes. Such predictions are useful not only to forecast direct effects of climate, productivity, land use, or habitat degradation, but also changes in the food web, such as expanding/increasing species that are predators, ...

    • How spatial variation in areal extent and configuration of labile vegetation states affect the riparian bird community in Arctic Tundra 

      Henden, John-André; Yoccoz, Nigel; Ims, Rolf Anker; Langeland, Knut (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      The Arctic tundra is currently experiencing an unprecedented combination of climate change, change in grazing pressure by large herbivores and growing human activity. Thickets of tall shrubs represent a conspicuous vegetation state in northern and temperate ecosystems, where it serves important ecological functions, including habitat for wildlife. Thickets are however labile, as tall shrubs respond ...

    • The importance of willow thickets for ptarmigan and hares in shrub tundra : the more the better? 

      Ehrich, Dorothee; Henden, John-André; Ims, Rolf Anker; Doronina, Lilyia O; Killengreen, Siw Turid; Lecomte, Nicolas; Pokrovsky, Ivan; Skogstad, Gunhild; Sokolov, Alexander A.; Sokolov, Vasily A.; Yoccoz, Nigel (Journal article; Tidsskriftartikkel; Peer reviewed, 2012)

    • Indirect food web interactions mediated by rodent cycles: Relative roles of lemmings and voles 

      Ims, Rolf Anker; Henden, John-André; Thingnes, Anders Voss; Killengreen, Siw Turid (Journal article; Tidsskriftartikkel; Peer reviewed, 2013-12-23)
      Production cycles in birds are proposed as prime cases of indirect interactions in food webs. They are thought to be driven by predators switching from rodents to bird nests in the crash phase of rodent population cycles. Although rodent cycles are geographically widespread and found in different rodent taxa, bird production cycles appear to be most profound in the high Arctic where lemmings ...

    • Iterative model predictions for wildlife populations impacted by rapid climate change 

      marolla, Filippo; Henden, John-André; Fuglei, Eva; Pedersen, Åshild Ønvik; Itkin, Mikhail; Ims, Rolf Anker (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-01-14)
      To improve understanding and management of the consequences of current rapid environmental change, ecologists advocate using long-term monitoring data series to generate iterative near-term predictions of ecosystem responses. This approach allows scientific evidence to increase rapidly and management strategies to be tailored simultaneously. Iterative near-term forecasting may therefore be particularly ...

    • Not only mosses: lemming winter diets as described by DNA metabarcoding 

      Soininen, Eeva M; Zinger, Lucie; Gielly, Ludovic; Yoccoz, Nigel Gilles; Henden, John-André; Ims, Rolf Anker (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-04-01)
      The temporal dynamics of most tundra food webs are shaped by the cyclic population dynamics of lemmings. While processes during winter may be behind the recent disruptions of lemming cycles, lemming winter ecology is poorly known. We present here the first DNA metabarcoding data on the winter diet of Norwegian lemmings (Lemmus lemmus), based on feces collected after a winter of population ...

    • Plastic reproductive allocation as a buffer against environmental stochasticity : linking life history and population dynamics to climate 

      Bårdsen, Bård-Jørgen; Henden, John-André; Fauchald, Per; Tveraa, Torkild; Stien, Audun (Journal article; Tidsskriftartikkel; Peer reviewed, 2011)
      Empirical work suggest that long-lived organisms have adopted risk sensitive reproductive strategies where individuals trade the amount of resources spent on reproduction versus survival according to expected future environmental conditions. Earlier studies also suggest that climate affects population dynamics both directly by affecting population vital rates and indirectly through long-term changes ...

    • Populasjonssykluser hos rype – stor variasjon i rom og tid 

      Henden, John-André; Fuglei, Eva; Ims, Rolf Anker (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-06-27)
      Fjellrype og lirype har en vid sirkumpolar utbredelse, med populasjoner som ofte har store, sykliske svingninger. Disse rypesyklusenes periodelengde og amplitude varierer imidlertid svært mye i tid og rom. Mens norske rypepopulasjoner har hatt en 3–4-års syklus koplet til smågnagersyklusen, kan rype andre steder i verden ha 9–11-års sykluser koplet til andre arter i økosystemet. Rypedynamikken kan ...

    • Population dynamics of tundra voles in relation to configuration of willow thickets in southern arctic tundra 

      Henden, John-André; Ims, Rolf Anker; Yoccoz, Nigel; Sørensen, Raymond; Killengreen, Siw Turid (Journal article; Tidsskriftartikkel; Peer reviewed, 2011)
      The areal extent and conWguration of thickets of willow shrubs are currently changing in the Arctic both as an eVect of global warming and changed browsing pressure of reindeer. These changes have been predicted to impact the distribution and abundance of wildlife species relying on willow thickets as habitat. We assessed the relation between variables quantifying willow thicket configuration and ...

    • The PREDICTS database: a global database of how local terrestrial biodiversity responds to human impacts 

      Hudson, Lawrence N.; Newbold, Tim; Contu, Sara; Hill, Samantha L. L.; Lysenko, Igor; Palma, Adriana De; Phillips, Helen R. P.; Senior, Rebecca A.; Bennett, Dominic J.; Booth, Hollie; Choimes, Argyrios; Correia, David L. P.; Day, Julie; Echeverría-Londoño, Susy; Garon, Morgan; Harrison, Michelle L. K.; Ingram, Daniel J.; Jung, Martin; Kemp, Victoria; Kirkpatrick, Lucinda; Martin, Callum D.; Pan, Yuan; White, Hannah J.; Aben, Job; Abrahamczyk, Stefan; Adum, Gilbert B.; Aguilar-Barquero, Virginia; Aizen, Marcelo A.; Ancrenaz, Marc; Arbeláez-Cortés, Enrique; Armbrecht, Inge; Azhar, Badrul; Azpiroz, Adrián B.; Baeten, Lander; Báldi, András; Banks, John E.; Barlow, Jos; Batary, Peter; Bates, Adam J.; Bayne, Erin M.; Beja, Pedro; Berg, Åke; Berry, Nicholas J.; Bicknell, Jake E.; Bihn, Jochen H.; Böhning-Gaese, Katrin; Boekhout, Teun; Boutin, Celine; Bouyer, Jeremy; Brearley, Francis Q.; Brito, Isabel; Brunet, Jörg; Buczkowski, Grzegorz; Buscardo, Erika; Cabra-Garcia, Jimmy; Calvino-Cancela, Maria; Cameron, Sydney A.; Cancello, Eliana M.; Carrijo, Tiago F.; Carvalho, Anelena L.; Castro, Helena; Castro-Luna, Alejandro A.; Cerda, Rolando; Cerezo, Alexis; Chauvat, Matthieu; Clarke, Frank M.; Cleary, Daniel F.R.; Connop, Stuart P.; D'Aniello, Biagio; da Silva, Pedro Giovani; Darvill, Ben; Dauber, Jens; Dejean, Alain; Diekotter, Tim; Dominguez-Haydar, Yamileth; Dormann, Carsten F.; Dumont, Bertrand; Dures, Simon G.; Dynesius, Mats; Edenius, Lars; Elek, Zoltán; Entling, Martin H.; Farwig, Nina; Fayle, Tom M.; Felicioli, Antonio; Felton, Annika M.; Ficetola, Gentile F.; Filgueiras, Bruno K.C.; Fonte, Steven J.; Fraser, Lauchlan H.; Fukuda, Daisuke; Furlani, Dario; Ganzhorn, Jörg U.; Garden, Jenni G.; Gheler-Costa, Carla; Giordani, Paolo; Giordano, Simonetta; Gottschalk, Marco S.; Goulson, Dave; Gove, Aaron D.; Grogan, James; Hanley, Mick E.; Hanson, Thor; Hashim, Nor R.; Hawes, Joseph E.; Hebert, Christian; Helden, Alvin J.; Henden, John-André; Hernandez, Lionel; Herzog, Felix; Higuera-Diaz, Diego; Hilje, Branko; Horgan, Finbarr G.; Horvath, Roland; Hylander, Kristoffer; Isaacs-Cubides, Paola; Ishitani, Masahiro; Jacobs, Carmen T.; Jaramillo, Victor J.; Jauker, Birgit; Jonsell, Mats; Jung, Thomas S.; Kapoor, Vena; Kati, Vassiliki; Katovai, Eric; Kessler, Michael; Knop, Eva; Kolb, Anette; Korösi, Adam; Lachat, Thibault; Lantschner, Victoria; Le Feon, Violette; LeBuhn, Gretchen; Legare, Jean-Philippe; Letcher, Susan G.; Littlewood, Nick A.; Lopez-Quintero, Carlos A.; Louhaichi, Mounir; Lövei, Gabor L.; Lucas-Borja, Manuel Esteban; Luja, Victor H.; Maeto, Kauro; Magura, Tibor; Mallari, Neil Aldrin; Marin-Spiotta, Erika; Marshall, E.J.P.; Martinez, Eliana; Mayfield, Margaret M.; Mikusinski, Grzegorz; Milder, Jeffrey C.; Miller, James R.; Morales, Carolina L.; Muchane, Mary N.; Muchane, Muchai; Naidoo, Robin; Nakamura, Akihiro; Naoe, Shoji; Nates-Parra, Guiomar; Navarrete Gutierrez, Dario A.; Neuschulz, Eike L.; Noreika, Norbertas; Norfolk, Olivia; Noriega, Jorge Ari; Nöske, Nicole M.; O'Dea, Niall; Oduro, William; Ofori-Boateng, Caleb; Oke, Chris O.; Osgathorpe, Lynne M.; Paritsis, Juan; Parra-H, Alejandro; Pelegrin, Nicolas; Peres, Carlos A.; Persson, Anna S.; Petanidou, Theodora; Phalan, Ben; Philips, T. Keith; Poveda, Katja; Power, Eileen F.; Presley, Steven J.; Proenc, Vania; Quaranta, Marino; Quintero, Carolina; Redpath-Downing, Nicola A.; Reid, J. Leighton; Reis, Yana T.; Ribeiro, Danilo B.; Richardson, Barbara A.; Richardson, Michael J.; Robles, Carolina A.; Römbke, Jörg; Romero-Duque, Luz Piedad; Rosselli, Loreta; Rossiter, Stephen J.; Roulston, T’ai H.; Rousseau, Laurent; Sadler, Jonathan P.; Sáfi án , Szabolcs; Saldana-Vázquez, Romeo A.; Samnegård, Ulrika; Schüepp, Christof; Schweiger, Oliver; Sedlock, Jodi L.; Shahabuddin, Ghazala; Sheil, Douglas; Silva, Fernando A. B.; Slade, Eleanor M.; Smith-Pardo, Allan H.; Sodhi, Navjot S.; Somarriba, Eduardo J.; Sosa, Ramón A.; Stout, Jane C.; Struebig, Matthew J.; Sung, Yik-Hei; Threlfall, Caragh G.; Tonietto, Rebecca; Tóthmérész, Béla; Tscharntke, Teja; Turner, Edgar C.; Tylianakis, Jason M.; Vanbergen, Adam J.; Vassilev, Kiril; Verboven, Hans A. F.; Vergara, Carlos H.; Vergara, Pablo M.; Verhulst, Jort; Walker, Tony R.; Wang, Yanping; Watling, James I.; Wells, Konstans; Williams, Christopher D.; Willig, Michael R.; Woinarski, John C. Z.; Wolf, Jan H. D.; Woodcock, Ben A.; Yu, Douglas W.; Zaitsev, Andrey S.; Collen, Ben; Ewers, Rob M.; Mace, Georgina M.; Purves, Drew W.; Scharlemann, Jörn P. W.; Purvis, Andy (Journal article; Tidsskriftartikkel; Peer reviewed, 2014-12)
      Biodiversity continues to decline in the face of increasing anthropogenic pressures such as habitat destruction, exploitation, pollution and introduction of alien species. Existing global databases of species’ threat status or population time series are dominated by charismatic species. The collation of datasets with broad taxonomic and biogeographic extents, and that support computation of a ...

    • Prosjekt ”Fjellrev i Finnmark” : rapport for perioden 2004-2007 

      Ims, Rolf Anker; Killengreen, Siw Turid; Henden, John-André; Yoccoz, Nigel Gilles (Research report; Forskningsrapport, 2007)

    • Rapid, landscape scale responses in riparian tundra vegetation to exclusion of small and large mammalian herbivores 

      Ravolainen, Virve; Bråthen, Kari Anne; Ims, Rolf Anker; Yoccoz, Nigel; Henden, John-André; Killengreen, Siw Turid (Journal article; Tidsskriftartikkel; Peer reviewed, 2011)
      Productive tundra plant communities composed of a variety of fast growing herbaceous and woody plants are likely to attract mammalian herbivores. Such vegetation is likely to respond to different-sized herbivores more rapidly than currently acknowledged from the tundra. Accentuated by currently changing populations of arctic mammals there is a need to understand impacts of different-sized herbivores ...

    • 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 ...

    • Shedding new light on the diet of Norwegian lemmings: DNA metabarcoding of stomach content 

      Soininen, Eeva Marjatta; Zinger, Lucie; Gielly, Ludovic; Bellemain, Eva; Bråthen, Kari Anne; Brochmann, Christian; Epp, Laura; Gusarova, Galina; Hassel, Kristian; Henden, John-André; Killengreen, Siw Turid; Rämä, Teppo; Stenøien, Hans; Yoccoz, Nigel; Ims, Rolf Anker (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      Lemmings are key herbivores in many arctic food webs, and their population dynamics have major impacts on the functioning of tundra systems. However, current knowledge of lemming diet is limited, hampering evaluation of lemming–vegetation interactions. This lack of knowledge is mainly due to methodological challenges, as previously used microhistological methods result in large proportions of poorly ...

    • 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 ...