Seasonal incidence of opportunistic reports in all garden bird mortality 2001–2006.

<p>Hatched bars – winter (Dec-Feb), open bars – spring (March–May), stippled bars – summer (June–Aug) and black bars - autumn (Sept-Nov). Note break in axis indicating an unprecedented level of reporting in autumn 2006.</p

Regional change in greenfinch occurrence in gardens in response to trichomonosis.

<p>Mean reporting rate from GBW of greenfinch, chaffinch and dunnock in spring 2005/06 (filled bars) and 2007 (open bars) in areas of Low, Intermediate and High incidence of trichomonosis incidence (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0012215#pone-0012215-g003" target="_blank">Fig. 3</a>). Bars represent 95% confidence limits.</p

Distribution of finch trichomonosis incidents in 2006.

<p>Gardens reporting at least one incident of finch trichomonosis (large red dots) and all other sites (small yellow dots) contributing to the systematic survey. The shading indicates relative incidence of trichomonosis recorded by the opportunistic survey (incidents per thousand households for each county interpolated from county centroids). The heavy lines delineate areas of High, Intermediate and Low incidence, based on the opportunistic survey data.</p

Seasonal variation in greenfinch occurrence in gardens.

<p>(a) Reporting rate for greenfinch in all GBW gardens for the years 1996–2005 (grey lines), 2006 (red) and 2007 (blue). (b) Fitted seasonal pattern of mean peak greenfinch count in 828 GBW gardens with complete counts in 2005. (c) Difference in mean peak count throughout the year between 2005 and 2006 for greenfinch, dashed lines represent 95% confidence limits.</p

Annual rate of population change as measured by the BBS in areas of differing disease incidence.

<p>Boxes show mean and quartiles of annual changes and whiskers minimum and maximum annual change observed in the period 1994–2006; points, the population change recorded in 2007. Dotted line indicates no population change.</p

Population change of breeding birds between 2006 and 2007.

<p>Population change between 2006 and 2007 in areas of High, Intermediate and Low incidence of trichomonosis mortality during autumn 2006 derived from the Breeding Bird Survey. The percentage change between the two years is given with approximate 95% confidence limits, n is the number of BBS squares in each region in which the species was recorded.</p

Necrotic ingluvitis lesions and trichomonad parasite morphology.

<p>(a) Necrotic ingluvitis lesions (arrow) with a characteristic yellow caseous appearance in a greenfinch caused by <i>Trichomonas gallinae</i> infection. (b) Morphology of the greenfinch trichomonad parasite. Scanning electron micrograph. Arrows indicate anterior flagella and axostyle.</p