Morphological variability was high as 4–6 of the six shell ratios tested were significantly different between stations.
Svipfarsbreytileiki var mikill milli beitukónga frá stöðvunum 10, í flestum tilfellum voru 4–6 útlitsbreytur beitukónga marktækt frábrugðnar á milli svæða, af þeim 6 sem prófaðar voru.