Study
Ecology of seed dispersal
Howe, Henry F.; Smallwood, Judith
Annual Review of Ecology and Systematics, 1982
A synthesis of why plants disperse seeds at all, organising the evidence around three non-exclusive advantages — escape from density-dependent mortality near the parent, colonisation of new sites, and directed dispersal to suitable microsites.
- Studied in
- Angiospermae
- Sample size
- synthesis of dispersal modes and their ecological consequences
Dispersal modes vary with plant size, habitat and the animals available. Seeds falling beneath a parent suffer disproportionate mortality from pathogens and seed predators, which alone can favour dispersal even without any new habitat to reach.
What it means
The authors' reading, and ours. Where they differ, that difference is the point.
How the authors put it
Seed dispersal is shaped by escape, colonisation and directed-dispersal advantages operating together rather than by any single benefit.
How NatureHQ reads it
The escape argument is the one that surprises people and is the most robust. It is easy to assume dispersal is about finding new ground; a large share of the benefit is simply not being under your parent, where specialised pathogens and seed predators concentrate. That also explains why the animal doing the dispersing frequently gains nothing intentional — a squirrel that forgets a cache and a bird that defecates a seed are both dispersing without any mutualism being negotiated.
- A review from 1982; quantitative dispersal modelling has advanced considerably since.
- The three advantages are hard to separate empirically in any one system.
- Tropical systems are better represented than temperate ones.
What this study is used for on NatureHQ
One study can inform several subjects. Here is everywhere this one is cited.
Seed dispersal
The biggest benefit of dispersal is not finding new ground — it is not landing under your parent
Seed dispersal
Whether a wind-blown seed travels metres or kilometres is decided by the weather, not by the seed
Oak trees
Acorns fall straight down. Jays are what carry them anywhere useful
Seed dispersal
Seeds that land under their parent are the most likely to be eaten or infected
Published by: Academic book publishersPublished as an academic monograph.
doi.org/10.1146/annurev.es.13.110182.001221
This reference was resolved automatically against Crossref on 2026-08-11.
NatureHQ summarises research in its own words and does not reproduce published text. Reviewed 2026-08-10.