Dissertation - HQ

xiv
Liste des figures
4.6 Distribution of coral reef fish larvae for each rotation . . . . 81
4.7 Regression tree of concentration of coral reef fish larvae
against taxonomic, ontogenetic, and physical factors . . . . . 82
4.8 Distribution of the normalised concentrations of the five
most abundant reef fish families during the four rotations . 83
4.9 Principal Component Analysis of the concentrations of the
ten most abundant reef fish families and various physical
factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
4.10 Concentration of reef fish larvae plotted over mean intensity
of current speed . . . . . . . . . . . . . . . . . . . . . . . . . . 85
4.11 Comparison of larval fishes abundance and residuals of
Generalised Linear Models . . . . . . . . . . . . . . . . . . . . 87
5.1 Demonstration of the bias in z cm calculation when using
concentration instead of standardised abundance . . . . . . . 97
5.2 Regression tree of the z cm against taxonomic, physical, and
ontogenetic factors . . . . . . . . . . . . . . . . . . . . . . . . 105
5.3 Z cms of the ten most abundant reef fish families . . . . . . . 105
5.4 Violin plot of z cms by family and ontogenetic stage for eight
common reef fish families . . . . . . . . . . . . . . . . . . . . 108
5.5 Violin plot of z cms for the global community at three ontogenetic
stages . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
5.6 Z cm in function of mean relative size . . . . . . . . . . . . . . 109
5.7 Trajectories of vertically migrating particles around a circular
island . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
6.1 State space representation of transitions in a simplified model121
6.2 Transition matrices for the simplest parameterisation of the
one-dimensional model . . . . . . . . . . . . . . . . . . . . . . 122
6.3 Two examples of optimal trajectories . . . . . . . . . . . . . . 126
6.4 Snapshot of Symphonie’s output . . . . . . . . . . . . . . . . . 127
6.5 Swimming decisions available in the refined model . . . . . 128
6.6 Comparison of optimal trajectories of a larva of type Acanthuridae
and a larva of type Pomacentridae . . . . . . . . . . 133
6.7 Schematic comparison of trajectories starting on the downstream
side of the island for Acanthuridae and Pomacentridae134
6.8 Linear regression of recruitment rate against the island-mass
factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
6.9 Bathymetry of the circular island and the promontory models138
6.10 Daily snapshots of surface flow in the island model . . . . . 140
6.11 Daily snapshots of surface flow in the promontory model . 141
6.12 Development of critical speed throughout the larval period
and effect of temperature . . . . . . . . . . . . . . . . . . . . . 144
6.13 Decrease of larval duration with increasing temperature . . 145
6.14 Possible explanation of the sudden increase in swimming
endurance during ontogeny . . . . . . . . . . . . . . . . . . . 147