Figure 1.
Each black dot contains 2 censused points (one on the top of the reef slope and one on the bottom of the reef slope).
Table 1.
Overall abundance, species and genus number per family observed by each technique.
Figure 2.
Species richness and density (number of individuals per 10 m2) observed per station according to technique and species size.
Three outlying values were not reported for better readability of the density plot: 14.85, 17.33 and 23.52 ind/10 m2 for small UVC. On the right of each boxplot, interaction plots on log-transformed averages are shown.
Figure 3.
Species richness and density observed per station for the 10 main families observed, distinguishing the size class of the species observed as small or large (see previous paragraph).
A size class in brackets indicates that all species observed in the family are characterized by the same size group. The result of the Student t-test on the difference between techniques is reported on the left side of the plot. NS: p>0.05; *: p<0.05.
Table 2.
Mean number of species per station (±SE) recorded for main families observed with UVC and STAVIRO.
Table 3.
Mean density (±SE) (ind/m2) recorded for main families observed with UVC and STAVIRO.
Figure 4.
Species richness and density (number of individuals per 10 m2) observed per station according to technique and to fishery target.
Two outlying values were not reported for better readability of the density plot: 17.48 and 23.84 ind/10 m2 for non-target UVC. On the right of each boxplot, interaction plots of log- and x2-transformed averages are shown.
Figure 5.
B: Barrier reef and I: Intermediate reef. Clusters are represented on the graph in bold: B1 = 1st cluster on the barrier reef; I = cluster on the intermediate reef; B2 = 2nd cluster on the barrier reef; Gp1, 2 and 3 = clusters not explained by habitat characteristics. Intermediate reef stations are in grey and barrier reef stations are in white.
Table 4.
Synthesis of results obtained in the present study: comparison of observations performed on 26 paired stations on reef slopes by UVC and STAVIRO.