Barred owl detection probabilities by dog versus vocalization surveys.

<p>As per <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0042892#pone-0042892-g002" target="_blank">Figure 2a</a>, detection probabilities were derived from from occupancy models using data for all polygons sampled, after controlling for occupancy <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0042892#pone.0042892-MacKenzie1" target="_blank">[1]</a>. These probabilities also incorporate the mean CJ-habitat quality values from the sites (see text). The lines represent 1 SE.</p

Northern spotted owl and barred owl detections during dog and vocalization surveys per polygon.

<p>Red squares correspond to northern spotted owls and yellow squares correspond to barred owls. An owl inside the square indicates a dog detection, a sound wave illustration inside the square indicates a vocalization survey detection. A ? inside the square indicates a one-time DNA amplification from a pellet, which thus did not meet the criterion of two successive DNA amplifications to confirm a species. Blue circles represent pellets located by dogs that failed to amplify for mtDNA. Each polygon number is indicated in white inside the black square outlining the polygon. The thin black lines indicate dog survey routes. Habitat quality ranges from high (green) to intermediate (yellow) to low (brown) and were generated from the Zabel et al. <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0042892#pone.0042892-Zabel1" target="_blank">[16]</a> and Carroll and Johnson <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0042892#pone.0042892-Carroll1" target="_blank">[17]</a> habitat models. The two models are merged by making the coarse <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0042892#pone.0042892-Carroll1" target="_blank">[17]</a> model transparent and overlaying it on the more fine-grained model <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0042892#pone.0042892-Zabel1" target="_blank">[16]</a>. This collectively increases and decreases color contrast on the map when the two models concur or differ, respectively.</p