Abstract: Large herbivores can strongly influence ecosystem structure and biodiversity, making knowledge of their space use important for trophic rewilding. We used GPS-tracking data collected over two years from 10 semi-feral cattle and 17 horses across ten Danish rewilding sites to analyse habitat use in a use-availability framework using resource selection functions (RSFs), complemented by direct behavioural observations. Both species showed large individual variability but overall used habitats disproportionately to availability, with higher relative use of open habitats; including dry grassland and heath-dune habitats, and lower relative use of dense shrub, conifer forest, mixed and broadleaved forest and wetlands relative to grasslands. Horses showed higher relative use of open wet and heath-dune habitats compared with cattle. Behavioural observations supported marked interspecific differences in activity budgets, with horses spending most observed time grazing and cattle allocating more time to resting and ruminating. Habitat use also varied seasonally, including increased use of wetlands and forests in summer, while supplementary winter feeding caused strong local shifts in habitat use by concentrating animal activity around winter feeding areas. These results show that habitat composition and management strongly determine where herbivore impacts are likely to be concentrated within rewilding sites, and that dense conifer-dominated stands are likely to receive relatively limited use by horses and cattle. Thus, considering herbivore space-use ecology in site planning and management and introducing herbivores with distinct digestive physiologies and foraging strategies such as horses and cattle, will improve the effectiveness of trophic rewilding.
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Overview
This study investigated how semi-feral cattle and horses use different habitats in Danish rewilding sites, showing that both species prefer open habitats but differ in their specific space use and behaviors.
It highlights the importance of species differences and habitat types for managing herbivore impacts and the success of trophic rewilding projects.
Research Objectives and Context
Large herbivores like cattle and horses can shape ecosystems and biodiversity significantly through their feeding and movement patterns.
Trophic rewilding aims to restore these ecological roles by reintroducing or supporting herbivore populations.
Understanding where and how these animals use the landscape is crucial to predict and manage their ecological impacts.
This study focused on comparing habitat use by semi-feral cattle and horses across multiple Danish rewilding sites over two years using GPS tracking and behavior observations.
Methodology
Subjects: 10 semi-feral cattle and 17 horses across 10 rewilding sites in Denmark.
Data Collection: Two years of GPS tracking to monitor spatial movement and habitat use.
Habitat Analysis: Used a ‘use-availability’ framework with resource selection functions (RSFs) to determine preferences or avoidance of particular habitat types relative to availability.
Complementary Data: Direct behavioral observations recorded to verify activity patterns and provide context to habitat use differences.
Key Findings on Habitat Use
Both species exhibited considerable individual variation in space use, indicating flexibility or personality differences.
Overall, there was a clear preference for open habitats such as dry grassland, heathlands, and dune habitats.
Reduced relative use was noted for dense shrubland, conifer forests, mixed and broadleaved forests, and wetlands compared to grasslands.
Horses showed a higher relative preference for open wet habitats and heath-dune areas than cattle did.
Seasonal changes affected habitat choice, with increased use of wetlands and forests in summer, likely related to forage availability and temperature regulation.
Winter supplementary feeding strongly concentrated animal activity around feeding sites, causing localized shifts in habitat use.
Cattle dedicated more time to resting and ruminating.
These differences reflect contrasting digestive physiologies and foraging strategies between the two species.
Implications for Rewilding Management
Habitat composition and management practices strongly influence how and where herbivores impact the landscape.
Dense coniferous forest stands tend to be used less by both species, suggesting limited herbivore influence in those areas.
Planning rewilding sites with consideration of herbivore spatial ecology can improve targeted ecosystem outcomes.
A mixed herbivore community, including species with different digestive and foraging traits like horses and cattle, broadens the range of vegetation types impacted and can create more diverse ecological effects.
Managing supplementary feeding locations is critical as they strongly affect spatial behavior and habitat use patterns during winter.
Conclusion
This study underscores the nuanced roles of species differences and habitat characteristics in shaping herbivore space use.
Effective trophic rewilding benefits from integrating these insights into site design and species selection to maximize ecological function and biodiversity benefits.
Cite This Article
APA
Bergin MD, Börger L, da Rocha ÉG, Havmøller RW, Jensen M, Svenning JC.
(2026).
Open habitats and species differences shape space use in semi-feral cattle and horses across Danish rewilding sites.
Environ Monit Assess, 198(6), 639.
https://doi.org/10.1007/s10661-026-15487-8
Center for Ecological Dynamics in a Novel Biosphere (ECONOVO), Department of Biology, Aarhus University, Ny Munkegade 114, DK- 8000, Aarhus C, Denmark. mberg@hempel.com.
Center for Ecological Dynamics in a Novel Biosphere (ECONOVO), Department of Biology, Aarhus University, Ny Munkegade 114, DK- 8000, Aarhus C, Denmark.
MeSH Terms
Animals
Cattle
Ecosystem
Horses / physiology
Denmark
Conservation of Natural Resources / methods
Environmental Monitoring
Herbivory
Biodiversity
Grant Funding
2020-0927 / 15. Juni Fonden
16549 / Villum Fonden
DNRF173 / Danmarks Grundforskningsfond
0135-00225B / Danmarks Frie Forskningsfond
Conflict of Interest Statement
Declarations. Ethics approval and consent to participate: All authors have read, understood, and have complied as applicable with the statement on “Ethical responsibilities of Authors” as found in the Instructions. No approval from research ethics committee was required in this study. Clinical trial number: not applicable. Competing interests: The authors declare no competing interests.
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