Cristin-resultat-ID: 1491487
Sist endret: 31. januar 2018, 10:24
NVI-rapporteringsår: 2017
Resultat
Vitenskapelig artikkel
2017

Migration in geographic and ecological space by a large herbivore

Bidragsytere:
  • Wibke Erika Brigitta Peters
  • Mark Hebblewhite
  • Atle Mysterud
  • Derek Spitz
  • Stefano Focardi
  • Ferdinando Urbano
  • mfl.

Tidsskrift

Ecological Monographs
ISSN 0012-9615
e-ISSN 1557-7015
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2017
Publisert online: 2017
Trykket: 2017
Volum: 87
Hefte: 2
Sider: 297 - 320
Open Access

Importkilder

Scopus-ID: 2-s2.0-85016237927

Klassifisering

Vitenskapsdisipliner

Zoologiske og botaniske fag

Beskrivelse Beskrivelse

Tittel

Migration in geographic and ecological space by a large herbivore

Sammendrag

Partial migration, when only part of the population migrates seasonally while the other part remains resident on the shared range, is the most common form of migration in ungulates. Migration is often defined by spatial separation of seasonal ranges and consequently, classification of individuals as migrants or residents is usually only based on geographic criteria. However, the underlying mechanism for migration is hypothesized to be movement in response to spatiotemporal resource variability and thus, migrants are assumed to travel an “ecological distance” (ED) or shift their realized ecological niches. While ecological and geographic distances should be related, their relationship may depend on landscape heterogeneity. Here, we tested the utility of ecological niche theory to both classify migratory individuals and to understand the underlying ecological factors for migratory behavior. We developed an integrative approach combining measures in geographic and ecological niche space and used this to classify and explain migratory behavior of 71 annual roe deer (Capreolus capreolus) movement trajectories in five European study areas. First, to assess the utility of the ED concept for classifying migratory behavior, we tested whether roe deer sought the same ecological conditions year-round or moved to different ecological conditions by measuring the annual ED travelled and the seasonal niche overlap using multivariate statistics. Comparing methods to classify migrants and residents based on geographic and ecological niche space, we found that migratory roe deer switched between seasons both in geographic and in ecological dimensions. Second, we tested which seasonal ecological factors separated resident from migrant niches using discriminant analysis and which broad-scale determinants (e.g., spatiotemporal forage variation and population density) predicted migration probability using generalized linear models. Our results indicated that factors describing forage and topographic variability discriminated seasonal migrant from resident niches. Determinants for predicting migration probability included the temporal variation (seasonality) and also the spatial variability of forage patches. Last, we also found suggestive evidence for a positive relationship between population density and migration probability. By applying the ecological niche concept to the study of partial migration in ungulates, our work underlines that partial migration is a form of behavioral plasticity. Key words: behavioral plasticity; Capreolus capreolus; ecological distance; large herbivores; niche switching; Normalized Difference Vegetation Index; partial migration; realized niche; spatiotemporal variation; ungulates

Bidragsytere

Wibke Erika Brigitta Peters

  • Tilknyttet:
    Forfatter
    ved University of Montana
  • Tilknyttet:
    Forfatter
    ved Centro Ricerca e Innovazione
  • Tilknyttet:
    Forfatter
    ved CEES ved Universitetet i Oslo

Mark Hebblewhite

  • Tilknyttet:
    Forfatter
    ved University of Montana
Aktiv cristin-person

Atle Mysterud

  • Tilknyttet:
    Forfatter
    ved CEES ved Universitetet i Oslo

Derek Spitz

  • Tilknyttet:
    Forfatter
    ved University of Montana

Stefano Focardi

  • Tilknyttet:
    Forfatter
    ved Italia
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