Study
Countershading: universally deceptive or deceptively universal?
Kiltie, Richard A.
Trends in Ecology & Evolution, 1988
Reviews the evidence for self-shadow concealment as the explanation for countershading, and sets out the competing functions a dorsoventral colour gradient could serve.
- Studied in
- Animalia
- Sample size
- critical review
Countershading is nearly ubiquitous and has several plausible functions besides concealment — protection from ultraviolet, thermoregulation, abrasion resistance, and signalling — and its near-universality makes concealment hard to establish as the explanation in any particular case.
What it means
The authors' reading, and ours. Where they differ, that difference is the point.
How the authors put it
A pattern this common may have several causes, and demonstrating that it conceals in one experiment does not establish why it is present in a given species.
How NatureHQ reads it
The corrective that keeps the countershading page honest. Rowland’s experiment shows the gradient can conceal; Kiltie’s point is that showing a benefit is not the same as showing the reason a particular animal has it, and that several other explanations remain live.
- A critique rather than a test; it identifies alternatives without adjudicating between them.
- Predates the experimental work that addressed part of its objection.
What this study is used for on NatureHQ
One study can inform several subjects. Here is everywhere this one is cited.
Countershading
Dark above and pale below does conceal: artificial prey with the gradient outlived uniform prey of the same average shade. But the pattern is so common that concealment need not be why any given animal has it.
Countershading
A fish is not mainly cancelling its own shadow. It is viewed against bright surface from below and dark depths from above — so the same dark-above, pale-below pattern is solving a different problem from a land animal’s.
Published by: Elsevier journalsPublished in an Elsevier journal.
doi.org/10.1016/0169-5347(88)90079-1
Checked against Crossref on 2026-09-28, and they agree on the title, the authors and the year.
NatureHQ summarises research in its own words and does not reproduce published text. Reviewed 2026-09-03.