Movement drives population dynamics of one of the most mobile ungulates on Earth: Insights from a mechanistic model.
LPJ-GUESS
Mongolian gazelle
Procapra gutturosa
climate change
dynamic global vegetation model
movement ecology
nomadic
population ecology
thermoregulation
ungulates
Journal
Ecology
ISSN: 1939-9170
Titre abrégé: Ecology
Pays: United States
ID NLM: 0043541
Informations de publication
Date de publication:
07 2023
07 2023
Historique:
received:
07
12
2022
accepted:
11
01
2023
medline:
4
7
2023
pubmed:
2
5
2023
entrez:
2
5
2023
Statut:
ppublish
Résumé
Long-distance movements are hypothesized to positively influence population size and stability of mobile species. We tested this hypothesis with a novel modeling approach in which moving herbivores interact with the environment created by a dynamic global vegetation model using highly mobile Mongolian gazelles in the eastern Mongolian grasslands as a case study. Gazelle population dynamics were modeled from 1901 to 2018 under two scenarios, one allowing free movement and one restricting movement. Gazelles were 2.2 times more abundant when they could move freely and were extirpated in 71% of the study area when mobility was restricted. Mobility resulted in greater population increases during times of abundant forage and smaller population decreases during drought. Reduced thermoregulatory costs associated with climate change, combined with an increase in vegetation biomass, increased gazelle abundance. Since high abundances often resulted in overgrazing and, thus, extirpation when movement was restricted, mobility had an important role in maintaining higher densities. The novel modeling approach shows how accounting for not just herbivore but also plant ecophysiology can improve our understanding of the population dynamics of highly mobile herbivores, in particular when examining the effects of habitat and climate change. Since the model simulates herbivores based on general physiological mechanisms that apply across large herbivores and the vegetation model can be applied globally, it is possible to adapt the model to other large-herbivore systems.
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
e4071Informations de copyright
© 2023 The Authors. Ecology published by Wiley Periodicals LLC on behalf of The Ecological Society of America.
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