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A Network Extension of Species Occupancy Models in a Patchy Environment Applied to the Yosemite Toad (Anaxyrus canorus)

Figure 2

Disentangling intrinsic meadow ‘environmental quality’ from its spatial ‘network quality’ with respect to predicted A. canorus breeding.

a) Normalized Network Improved breeding probabilities ((Network Boosted probability – Environmental Model probability) / (1 – Environmental Model probability)) for each meadow as a function of the mean Environmental Model probability. Symbol colors represent field survey results (Breeding detected (red), Breeding not detected (blue), and Meadow not visited (black). b-c) Total Influence (Gi) of meadow deletion (the decrease in park-wide breeding probability summed across all meadows after deleting that meadow from the network) as a function of the Environmental Model and the Network-Boosted GLM probabilities. Horizontal dotted lines indicate the 90th percentile of meadow deletion impact, and solid red symbols are the known breeding meadows within that 90th percentile. Vertical dotted lines in all panels represent the threshold probability that maximizes both true positives and true negatives predicted by the model.

Figure 2