Study
Electroreception in juvenile scalloped hammerhead and sandbar sharks
Kajiura, Stephen M.; Holland, Kim N.
Journal of Experimental Biology, 2002
Juvenile hammerheads and sandbar sharks were presented with prey-simulating dipole electric fields, and the distance and angle at which each initiated an orientation response were measured and compared against head morphology.
- Studied in
- Sphyrna lewini, Carcharhinus plumbeus
- Sample size
- juvenile sharks tested against dipole electric fields
Both species detected fields at comparable minimum voltage gradients, but the hammerhead’s wide head gave it a substantially larger sampling area and a wider search path, without greater per-pore sensitivity.
What it means
The authors' reading, and ours. Where they differ, that difference is the point.
How the authors put it
The hammerhead’s cephalofoil enhances electrosensory search by increasing the area swept, rather than by making individual receptors more sensitive.
How NatureHQ reads it
A clean example of a morphological explanation beating a physiological one. The obvious hypothesis — a hammerhead detects weaker fields — is wrong; the head is a wider sweep, not a better antenna. It is also a reminder that "why is it shaped like that" usually has several answers at once, since the cephalofoil has been argued to serve vision and manoeuvring too.
- Juveniles only, in tanks; adult hammerheads are difficult to test.
- A single stimulus type — a dipole is a simplification of a real prey field.
- Does not test the competing hypotheses about the head shape, only the electrosensory one.
What this study is used for on NatureHQ
One study can inform several subjects. Here is everywhere this one is cited.
Published by: The Company of BiologistsPublished by The Company of Biologists.
doi.org/10.1242/jeb.205.23.3609
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 2026-08-09.