Fig. 2
From: Avian keratin disorder of Alaska black-capped chickadees is associated with Poecivirus infection
Association between Poecivirus and AKD in BCCH. Graph combines swab data from the current study with our previous data that tested individuals for Poecivirus using beak and cloacal tissue. Y-axis shows the number of individuals tested with a given beak length; individuals testing negative for Poecivirus are highlighted in blue and those testing positive for Poecivirus are in orange. Note that the x-axis is not to scale (beak lengths for which we had no individual data are excluded from the graph). Individuals to the right of the vertical line are classified as having AKD based on beak length or morphology. The hatched data point represents the single individual with an apparently normal beak that tested positive for Poecivirus and later developed an elongated beak; this is the only individual represented twice on the graph and the data points are linked by a dashed line, with the arrow pointing to the later beak measurement