Figure 1.
Study area with dots marking sampling locations.
The offshore contours are depth isoclines at 30 m, 50 m, and 100 m.
Figure 2.
Chevron fish trap outfitted with an outward-looking Canon high-definition video camera over the mouth of the trap.
Table 1.
Variables evaluated as potential covariates influencing patterns in occurrence, abundance, and/or detection of red snapper Lutjanus campechanus.
Table 2.
General model structures evaluated for convergence properties and goodness of fit (GOF).
Figure 3.
Mean site occupancy probability and abundance of red snapper as a function of depth and latitude.
The left column contains the estimated mean site occupancy probability as a function of depth (top panel) and latitude (bottom panel) from the basic occupancy model. The right column contains the estimated mean site abundance as a function of depth (top panel) and latitude (bottom panel) from the Royle-Nichols occupancy model. The intervals represent 95% credible intervals.
Table 3.
Posterior probability summaries of parameters evaluated in the red snapper Lutjanus campechanus basic occupancy model using pooled camera trap data and without a site-specific random effect on camera trap detection probability (Bin(ψ) Bin(pchevron) Bin(pcamera)).
Table 4.
Posterior probability summaries of parameters evaluated in the red snapper Lutjanus campechanus Royle-Nichols occupancy model using pooled camera trap data and without a site-specific random effect on abundance (Pois(λ) Bin(pchevron) Bin(pcamera)).
Figure 4.
Mean site occupancy probability and abundance of red snapper in reef habitat off the coasts of Georgia and Florida.
Estimated mean occupancy probability of reef sites from the basic occupancy model (left panel) and abundance from the Royle-Nichols model (right panel) as a function of depth and latitude.
Figure 5.
Mean chevron and camera trap detection probabilities.
Estimated detection probabilities at the reference covariate values (intercept) from both the basic occupancy model (left panel) and the Royle-Nichols model (right panel) for red snapper. Note that for the basic occupancy model framework the detection probability is for the species at occupied sites. In contrast, for the Royle-Nichols framework the detection probability is for each individual at occupied sites. The intervals represent 95% credible intervals.
Figure 6.
Camera trap detection probabilities as influenced by turbidity and current direction.
The estimated detection probabilities at reference covariate values (intercept) and at high turbidity and with current direction away from the camera lens from both the basic occupancy model (left panel) and the Royle-Nichols model (right panel) for red snapper. Note that for the basic occupancy model framework the detection probability is for the species at occupied sites. In contrast, for the Royle-Nichols framework the detection probability is for each individual at occupied sites. The intervals represent 95% credible intervals.