Nonlinear spatial and temporal decomposition provides insight for climate change effects on sub-Arctic herbivore populations.

Climate window Decomposed covariates Generalized additive models Plant productivity Reindeer Varying coefficient models

Journal

Oecologia
ISSN: 1432-1939
Titre abrégé: Oecologia
Pays: Germany
ID NLM: 0150372

Informations de publication

Date de publication:
Apr 2022
Historique:
received: 23 10 2021
accepted: 06 03 2022
pubmed: 25 3 2022
medline: 4 5 2022
entrez: 24 3 2022
Statut: ppublish

Résumé

Global temperatures are increasing, affecting timing and availability of vegetation along with relationships between plants and their consumers. We examined the effect of population density, herd body condition in the previous year, elevation, plant productivity and phenology, snow, and winter onset on juvenile body mass in 63 semi-domesticated populations of Rangifer tarandus throughout Norway using spatiotemporal generalized additive models (GAMs) and varying coefficient models (VCMs). Optimal climate windows were calculated at both the regional and national level using a novel nonlinear climate window algorithm optimized for prediction. Spatial and temporal variation in effects of population and environmental predictors were considered using a model including covariates decomposed into spatial, temporal, and residual components. The performance of this decomposed model was compared to spatiotemporal GAMs and VCMs. The decomposed model provided the best fit and lowest prediction errors. A positive effect of herd body condition in the previous year explained most of the deviance in calf body mass, followed by a more complex effect of population density. A negative effect of timing of spring and positive effect of winter onset on juvenile body mass suggested that a snow free season was positive for juvenile body mass growth. Our findings suggest early spring onset and later winter permanent snow cover as reinforcers of early-life conditions which support more robust reindeer populations. Our methodological improvements for climate window analyses and effect size measures for decomposed variables provide important contributions to account for, measure, and interpret nonlinear relationships between climate and animal populations at large scales.

Identifiants

pubmed: 35325288
doi: 10.1007/s00442-022-05150-7
pii: 10.1007/s00442-022-05150-7
doi:

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

IM

Pagination

889-904

Subventions

Organisme : National Science Foundation
ID : DGE-1414475
Organisme : Research Council of Norway
ID : 276395

Commentaires et corrections

Type : ErratumIn

Informations de copyright

© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

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Auteurs

Hannah E Correia (HE)

Harvard Data Science Initiative, Harvard University, Cambridge, MA, USA. hcorreia@hsph.harvard.edu.
Department of Biostatistics, Harvard University, 655 Huntingdon Ave, Boston, MA, 02115, USA. hcorreia@hsph.harvard.edu.

Torkild Tveraa (T)

Norwegian Institute for Nature Research (NINA), Fram Centre, Tromsø, Norway.

Audun Stien (A)

Department of Arctic and Marine Biology, The Arctic University of Norway, Tromsø, Norway.

Nigel Yoccoz (N)

Norwegian Institute for Nature Research (NINA), Fram Centre, Tromsø, Norway.
Department of Arctic and Marine Biology, The Arctic University of Norway, Tromsø, Norway.

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