Seed Dispersal Dynamics Involving Scatter-Hoarding Rodents

Scatter-hoarding rodents play a pivotal role in forest regeneration by gathering, transporting and burying seeds in numerous small caches. This behaviour not only fulfils their nutritional needs but also inadvertently facilitates seed dispersal and establishment, shaping plant community composition across landscapes. Seed traits—such as size, nutrient content, mechanical defences and secondary metabolites—interact with rodent cognitive abilities and foraging strategies to determine whether seeds are consumed or left to germinate. Environmental factors, including microhabitat structure and seasonal food availability, further influence cache placement and pilferage rates. Together, these processes underpin mutualistic coevolutionary dynamics between woody plants and rodents, with global implications for biodiversity maintenance, carbon sequestration and the design of effective reforestation and conservation programmes.

Research from Nature Portfolio

A foundational investigation into cotyledon reserves in acorns revealed that up to 60 % of cotyledonary tissue can be removed without impairing germination or subsequent seedling performance. Post-removal mass emerged as a superior predictor of seedling vigour, indicating that large seeds possess surplus energy reserves beyond immediate developmental needs. Furthermore, larger acorns with intact or partially damaged cotyledons were preferentially selected and cached by rodents, implying that excess reserves may have evolved primarily to trade off between predation risk and dispersal benefits. These findings illuminate the energetic and mechanical strategies by which trees manipulate rodent behaviour to enhance seed dispersal success.

Seed Dispersal Dynamics Involving Scatter-Hoarding Rodents publication trend

The graph below shows the total number of articles in seed dispersal dynamics involving scatter-hoarding rodents across all publications each year (not limited to Nature Index journals).

Technical terms

Scatter-hoarding: A foraging strategy of burying seeds in multiple spatially dispersed caches for later retrieval, often resulting in unintended seed dispersal.

Cotyledon: A seed’s nutrient reserve or ‘seed leaf’ that supplies energy to the germinating embryo until photosynthetic independence.

Radicle pruning: The targeted removal of the embryonic root by rodents to interrupt or delay seed germination within caches.

Embryo excision: The act of removing the embryonic axis from a seed to prevent sprouting and maintain its edibility over time.

Microbiota-gut-brain axis: The bidirectional communication network linking gastrointestinal microorganisms with central nervous system function, here shown to affect rodent memory and hoarding behaviour.

References

1. Squirrel-Seed Interactions: The Evolutionary Strategies and Impact of Squirrels as Both Seed Predators and Seed Dispersers. Frontiers in Ecology and Evolution (2020).
2. Acorn cotyledons are larger than their seedlings' need: evidence from artificial cutting experiments. Scientific Reports (2015).
3. High-tannin food enhances spatial memory and scatter-hoarding in rodents via the microbiota-gut-brain axis. Microbiome (2024).
4. Behavioral adaptation of sympatric rodents to early germination of oak acorns: radicle pruning and embryo excision. Frontiers in Plant Science (2023).
5. Tricky to track: comparing different tagging methods for tracing beechnut dispersal by small mammals. Ecological Research (2018).