Number of influenza A virus infection (RRT-PCR positive) days per month in 2009 and 2010 given for 10 individual mallards kept under close to natural conditions in close proximity to wild mallards.

<p>Number of influenza A virus infection (RRT-PCR positive) days per month in 2009 and 2010 given for 10 individual mallards kept under close to natural conditions in close proximity to wild mallards.</p

Changes in influenza A virus shedding (measured as C<i>_T</i>-value in RRT-PCR positive faecal samples) with progress of autumn in 2009 and 2010.

<p>Changes in influenza A virus shedding (measured as C<i>_T</i>-value in RRT-PCR positive faecal samples) with progress of autumn in 2009 and 2010.</p

Temporal change of anti-NP-antibodies in 10 mallards kept under close to natural conditions in close proximity to wild mallards.

<p>Data are presented as the inversed monthly mean of the sample to negative control ratio for each individual. The cut-off for positivity is shown by a hatched line. Colours correspond to <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0061201#pone-0061201-g001" target="_blank">Figure 1</a>.</p

Spatial distribution of mallard GPS fixes (white dots, all individuals pooled) on southern Öland, Sweden, October – December 2010.

<p>Fixes from flying birds (speed >4 m/s) are excluded.</p

Selection ratios (<i>w_i</i>) at the home-range level, averaged over 16 mallards studied on southern Öland, Sweden, October – December 2010, with respective 95% confidence interval (CI) lower and upper limits.

<p>The table shows the selection ratios when considering the habitat as a six-level factor (all wet habitats are pooled together). The habitats are ordered from the most (top) to the least preferred habitat (bottom).</p

Habitat use time-budgets (in %) from last light to first light for 16 mallards studied on southern Öland, Sweden, October – December 2010.

<p>Habitat use time-budgets (in %) from last light to first light for 16 mallards studied on southern Öland, Sweden, October – December 2010.</p

Previously published home-range sizes for mallards in comparison to the present study.

<p>(Further examples exist, especially for breeding birds, but our aim here is to show a representative variation.).</p><p>*Mean values not published.</p><p>**This mean value does not include foraging areas.</p

Distance between consecutive locations for 16 mallards on southern Öland, Sweden, October – December 2010, during different periods of the day; <i>dawn</i> = first light to sunrise (close to two hours duration), <i>day</i> = sunrise to sunset (7–9 hours), <i>dusk</i> = sunset to last light (close to two hours duration), and <i>night</i> = last light to first light (11–13 hours).

<p>Distance between consecutive locations for 16 mallards on southern Öland, Sweden, October – December 2010, during different periods of the day; <i>dawn</i>  =  first light to sunrise (close to two hours duration), <i>day</i>  =  sunrise to sunset (7–9 hours), <i>dusk</i>  =  sunset to last light (close to two hours duration), and <i>night</i>  =  last light to first light (11–13 hours).</p

Percentage of time spent by mallards in different habitats (all individuals, with standard deviation bars) on southern Öland, Sweden, October – December 2010.

<p>Percentage of time spent by mallards in different habitats (all individuals, with standard deviation bars) on southern Öland, Sweden, October – December 2010.</p

Total habitat use time-budgets (in %), home-range size (100% MCP; in ha), and number of GPS fixes for 16 mallards studied on southern Öland, Sweden, October – December 2010.

<p>Total habitat use time-budgets (in %), home-range size (100% MCP; in ha), and number of GPS fixes for 16 mallards studied on southern Öland, Sweden, October – December 2010.</p