Dissertation - HQ

108 Vertical distribution during ontogeny
Figure 5.4 “Violin” plot of the distribution of z cm by family and ontogenetic
stage. Each shape represents the probability density function of z cms, estimated
via kernel density at 512 points in the domain 0-100 m. Basically, z cms were more
likely to be where the shapes are wide. The probability density was not estimated
for post-flexion larvae in Lethrinidae and Holocentridae because catches were
too low.
Table 5.1 Tests for differences in variances (Fligner-Killeen) and medians
(Kruskal-Wallis) for the z cms of different ontogenetic stages of eight abundant
families of coral reef fishes. For Lethrinidae and Holocentridae, only pre-flexion
and flexion stages are used. For each test, both the test statistic and the p-value
are reported (values are bolded in significant tests, and italicised for close to
significant ones). In the last three columns are the z cm medians (in m) for each
family and stage.
Family Fligner Kruskal z cm
χ 2 – p χ 2 – p pre flex post
Serranidae 5.07 – 0.08 7.86 – 0.02 29 < 36 < 45
Pomacentridae 4.02 – 0.13 2.63 – 0.27 58 46 41
Lutjanidae 1.16 – 0.56 2.16 – 0.34 27 22 31
Lethrinidae 2.66 – 0.26 3.12 – 0.21 17 14
Labridae 0.63 – 0.73 7.91 – 0.019 26 < 38 < 47
Holocentridae 3.12 – 0.21 6.10 – 0.047 17 < 40
Apogonidae 6.07 – 0.05 5.88 – 0.053 15 20 24
Acanthuridae 1.38 – 0.5 6.44 – 0.04 35 < 41 < 43