Table 2 Top Generalised Additive Mixed Models (GAMMs) for predicting probability of observation, abundance given observation and time of arrival from full-subsets analyses for the five shark groups. The difference between the lowest reported Akaike Information Criterion corrected for small sample size (AICc), AICc weights (wAICc), variance explained (R2) and estimated degrees of freedom (EDF) are reported for model comparison. The most parsimonious model is shown in bold and was defined as the model that contains the fewest variables and the lowest EDF within two units of the lowest AICc.
From: Drivers of variation in occurrence, abundance, and behaviour of sharks on coral reefs
Shark group | Model | ΔAICc | ωAICc | R2 | EDF |
|---|---|---|---|---|---|
Probability of occurrence | |||||
Apex sharks | SD relief + sqrt distance to ramp + depth | 0 | 0.23 | 0.02 | 12.71 |
SD relief + depth | 0.19 | 0.21 | 0.02 | 11.92 | |
SD relief + reef cover | 1.16 | 0.13 | 0.02 | 12.52 | |
SD relief + sqrt distance to ramp + reef cover | 1.57 | 0.1 | 0.02 | 14.3 | |
C. amblyrhynchos | Reef cover + sqrt depth + status | 0 | 0.81 | 0.15 | 7.47 |
C. melanopterus | SD relief + sqrt depth | 0 | 0.36 | 0.03 | 5.85 |
SD relief + sqrt depth + status | 1.19 | 0.19 | 0.03 | 6.85 | |
SD relief + reef + sqrt depth | 1.25 | 0.19 | 0.03 | 7.03 | |
SD relief + sqrt distance to ramp + sqrt depth | 1.29 | 0.18 | 0.03 | 6.85 | |
T. obesus | Reef cover + sqrt distance to ramp + sqrt depth | 0 | 0.74 | 0.04 | 8.24 |
Abundance | |||||
C. melanopterus | Reef cover | 0 | 0.27 | 0.11 | 4.92 |
SD relief + reef cover | 0.27 | 0.24 | 0.14 | 6.55 | |
Reef cover + status | 1.29 | 0.14 | 0.11 | 5.91 | |
Sqrt distance to ramp + reef cover | 1.87 | 0.11 | 0.12 | 6.41 | |
C. amblyrhynchos | Sqrt distance to ramp | 0 | 0.18 | 0.04 | 4.69 |
Sqrt distance to ramp + status | 0.61 | 0.13 | 0.05 | 5.74 | |
SD relief + sqrt distance to ramp | 1.71 | 0.07 | 0.04 | 5.71 | |
T. obesus | Status | 0 | 0.14 | 0.06 | 4 |
Sqrt distance to ramp | 1.03 | 0.09 | 0.08 | 4 | |
Reef cover + status | 1.21 | 0.08 | 0.09 | 5.38 | |
Reef cover | 1.4 | 0.07 | 0.10 | 4.53 | |
Sqrt distance to ramp + status | 1.54 | 0.07 | 0.09 | 5.43 | |
SD relief + status | 1.98 | 0.05 | 0.07 | 5 | |
Time of arrival | |||||
Apex sharks | SD relief + sqrt distance to ramp | 0 | 0.31 | 0.11 | 6.43 |
SD relief + reef cover + sqrt distance to ramp | 0.65 | 0.22 | 0.13 | 8 | |
SD relief + sqrt distance to ramp + depth | 1.23 | 0.16 | 0.12 | 7.36 | |
SD relief + sqrt distance to ramp + status | 1.77 | 0.12 | 0.11 | 7.41 | |
C. melanopterus | SD relief + reef cover + sqrt distance to ramp | 0 | 0.99 | 0.14 | 7.43 |
C. amblyrhynchos | SD relief + sqrt depth + sqrt distance to ramp | 0 | 0.59 | 0.10 | 8.65 |
SD relief + sqrt distance to ramp + status | 0.73 | 0.41 | 0.10 | 7.93 | |
T. obesus | SD relief + reef + sqrt distance to ramp | 0 | 0.47 | 0.10 | 6.98 |
Reef cover + sqrt distance to ramp + status | 0.48 | 0.37 | 0.11 | 7.56 | |
Likelihood fed | |||||
C. amblyrhynchos | Reef cover + sqrt distance to ramp + status | 0 | 0.14 | 0.04 | 6.82 |
Reef cover + sqrt distance to ramp | 0.67 | 0.1 | 0.04 | 5.82 | |
Reef cover + sqrt depth + sqrt distance to ramp | 1 | 0.08 | 0.03 | 7.53 | |
Reef cover + sqrt depth + status | 1.09 | 0.08 | 0.03 | 7.5 | |
