Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2016
Authors
Camilla Lorange LindbergAbstract
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Authors
Brit Karen VikeAbstract
The regular movement of animals between summer and winter ranges, termed seasonal migration, is a common phenomenon among ungulates at northern latitudes. The most prominent hypothesis to explain seasonal migration is the forage maturation hypothesis; it predicts that large herbivores will preferentially follow phenological (or green-up) gradients in order to access the highest possible forage quality with sufficient quantity. Surprisingly few studies provide empirical testing of the forage maturation hypothesis, and a question not often addressed is which landscape variables underlie the phenological gradient that makes migration a beneficial strategy. I tested the forage maturation hypothesis using the normalized difference vegetation index (NDVI), an index of plant phenology, and feces analyses as measures of forage quality and linked it with space use data from partially migratory red deer (Cervus elaphus) in Norway. Specifically, I investigated whether migratory individuals had access to higher quality forage than stationary, and the role of landscape variables for access to high quality forage. Generalized linear mixed models were used to analyze different measures of forage quality as responses to a set of covariates, including landscape variables. I found evidence that migratory red deer gain access to more high quality forage than stationary red deer, consistent with the forage maturation hypothesis. I found a positive effect of elevation on access to high quality forage for migratory individuals, and a diverse effect of other landscape characteristics, such as aspect and home range size. There was a positive effect of distance to fjord on accessed forage quality. This study sheds light on the relationship between the landscape an ungulate inhabit and the possibilities and limitations to access high quality forage within this landscape. Considering future climate change, and consequent changes in phenological gradients, it is important to understand the mechanisms causing the phenological gradients that migratory ungulates benefit from. Given the high diversity of impact by different variables found in this study, the effect of climate change may differ for populations across ecosystems.
Authors
Frank MillerAbstract
No abstract has been registered
Authors
Elena I. Vanguelova Eleonora Bonifacio Bruno De Vos Marcel R. Hoosbeek Torsten W. Berger Lars Vesterdal Ketutis Armolaitis L. Celi Lucian Dinca O. Janne Kjønaas Pavel Pavlenda Jukka Pumpanen Ülle Püttsepp Brian Reidy Primož Simončič Brian Tobin Miglena ZhiyanskiAbstract
No abstract has been registered
Abstract
No abstract has been registered
Authors
May Bente BrurbergAbstract
No abstract has been registered
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Authors
Philip Evans Stephan Vollmer Joseph Kim George Chan Sara GibsonAbstract
No abstract has been registered
Authors
Emma Brunberg T Bas Rodenburg Lotta Rydhmer Joergen B. Kjaer Per Jensen Linda J. KeelingAbstract
No abstract has been registered
Abstract
No abstract has been registered