Ecological Dynamics of Small Mammal Communities and Populations

Small mammals occupy a central position in terrestrial ecosystems, acting as seed predators, prey items for higher trophic levels and vectors of zoonotic pathogens. Their population and community dynamics are governed by a complex interplay of biotic interactions, climatic variability and habitat structure. Local fluctuations often reflect shifts in resource availability, predation pressure and disease, while regional patterns emerge from metapopulation processes, dispersal and landscape connectivity. Trait‐based approaches reveal how body size, reproductive output and foraging behaviour mediate species’ responses to environmental change. Long‐term monitoring and novel analytical frameworks have uncovered non‐linear edge effects, density‐dependence and the decoupling of reproduction from population growth in some systems, pointing to the overriding role of mortality factors such as predation and disease. Understanding these dynamics is critical for managing agricultural pests, conserving biodiversity in fragmented landscapes and predicting the impacts of global change on small mammal assemblages.

Research from Nature Portfolio

Recent studies have illuminated how vegetation structure and climatic factors shape small mammal behaviour and demography. Experiments in savanna systems demonstrate that shrub encroachment reduces perceived predation risk uniformly across rodent species, leading to increased activity beneath woody cover and potential shifts in habitat use. This homogenisation of risk may alter foraging patterns and interspecific interactions. In grassland vole populations, a seventeen-year demographic series revealed strong correlations between winter temperature and spring reproductive output, yet population growth rates remained unlinked to either weather or female fecundity. These findings imply that mortality agents, rather than reproductive fluctuations, drive multi-annual population dynamics, challenging traditional models of cyclic rodent outbreaks.

Ecological Dynamics of Small Mammal Communities and Populations publication trend

The graph below shows the total number of articles in ecological dynamics of small mammal communities and populations across all publications each year (not limited to Nature Index journals).

Technical terms

Capture–mark–recapture: A field method that involves capturing individuals, marking them uniquely, releasing them and then recording subsequent recaptures to estimate population size, survival and movement.

Giving-up density: The amount of food remaining in a foraging patch when an animal ceases feeding; used as an index of perceived predation risk and foraging costs.

Litter size: The number of offspring born to a female in a single reproductive event; a key life-history trait influencing population growth rates.

References

1. Twenty-nine years of continuous monthly capture-mark-recapture data of multimammate mice (Mastomys natalensis) in Morogoro, Tanzania. Scientific Data (2023).
2. New insight into drivers of mammalian litter size from individual‐level traits. Ecography (2023).
3. Shrub cover homogenizes small mammals’ activity and perceived predation risk. Scientific Reports (2019).
4. Weather influences M. arvalis reproduction but not population dynamics in a 17-year time series. Scientific Reports (2019).
5. Dynamic Edge Effects in Small Mammal Communities across a Conservation-Agricultural Interface in Swaziland. PLOS ONE (2013).
6. Mow the Grass at the Mouse’s Peril: Diversity of Small Mammals in Commercial Fruit Farms. Animals (2019).