Table 2.

Post-hoc pairwise comparison of visual field parameters in four shark species

HorizontalVertical
MonocularMonocular
N. brevirostrisC. acronotusS. tiburoN. brevirostrisC. acronotusS. tiburo
C. acronotus<0.001--<0.050--
S. tiburo<0.001NS-NSNS-
S. lewini<0.001<0.0010.021NSNSNS
BinocularBinocular
N. brevirostrisC. acronotusS. tiburoN. brevirostrisC. acronotusS. tiburo
C. acronotusNS--0.033--
S. tiburoNSNS-NSNS-
S. lewini<0.001<0.001<0.001NSNSNS
CyclopeanCyclopean
N. brevirostrisC. acronotusS. tiburoN. brevirostrisC. acronotusS. tiburo
C. acronotus<0.001--NS--
S. tiburo<0.001NS-NSNS-
S. lewini<0.001NSNSNSNSNS
Convergence distance (cm)Convergence distance (cm)
N. brevirostrisC. acronotusS. tiburoN. brevirostrisC. acronotusS. tiburo
C. acronotusNS--NS--
S. tiburoNSNS-NSNS-
S. lewini0.027NSNSNSNSNS
Blind area (cm2)Blind area (cm2)
N. brevirostrisC. acronotusS. tiburoN. brevirostrisC. acronotusS. tiburo
C. acronotusNS--NS--
S. tiburoNSNS-NSNS-
S. lewiniNSNSNS0.031NSNS
Anterior eye rotation (deg.)Posterior eye rotation (deg.)
N. brevirostrisC. acronotusS. tiburoN. brevirostrisC. acronotusS. tiburo
C. acronotusNS--0.039--
S. tiburoNSNS-NSNS-
S. lewiniNSNSNSNS0.037NS
  • Two hammerhead (Sphyrna tiburo and Sphyrna lewini) and two carcharhinid species (Carcharhinus acronotus and Negaprion brevirostris) were compared. NS, not significant.