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Mammal Community Responses to Increasing Puma Activity in a Suburban Preserve
Chinmay Sonawane1, Kevin Leempoel1, Nicole Nova1
1Department of Biology Stanford University Stanford California USA.
Ecology and Evolution
|June 19, 2026
Summary
Predator activity, like pumas, can influence prey and mesopredator behavior in suburban areas. This study suggests increasing puma presence may alter ecosystem dynamics in human-dominated landscapes.
Area of Science:
- Ecology
- Wildlife Conservation
- Behavioral Ecology
Background:
- Predators significantly influence ecosystem structure through direct predation and fear-induced behavioral changes in prey and mesopredators.
- Previous research on these predator effects has largely focused on landscapes with minimal human presence.
- The ecological role of predators in human-dominated landscapes remains understudied, despite increasing human-wildlife overlap.
Purpose of the Study:
- To investigate the ecological impact of increasing puma (Puma concolor) activity in a suburban preserve.
- To determine if rising puma presence affects mesopredator (bobcats, coyotes, grey foxes) and prey (black-tailed deer, brush rabbits) activity patterns and behavior.
- To assess potential effects on local woody plant communities.
Main Methods:
- Utilized convergent cross mapping analysis to detect causal influences between species' activity.
- Analyzed daily activity patterns to identify shifts in nocturnality for prey and mesopredators.
- Conducted limited plant community sampling over a 17-year period to assess changes in woody plant density.
Main Results:
- Convergent cross mapping indicated that puma activity influenced longitudinal changes in prey and mesopredator activity.
- Prey and mesopredators exhibited decreased nocturnality, suggesting behavioral adjustments to avoid puma presence.
- Preliminary data showed an increase in woody plant density correlating with increased puma activity.
Conclusions:
- Increasing puma activity in a suburban environment showed preliminary evidence of altering mesopredator and prey dynamics.
- Behavioral shifts, such as reduced nocturnality, were observed in response to heightened predator presence.
- Further research is needed to confirm impacts on specific species and plant communities, highlighting the importance of predator persistence in human-modified ecosystems.
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