Habitat- and age-specific parameter estimates (demographic rates) and environmental variances used to model population growth.

<p>Parameter estimates are based on the age class of the male member of a pair, Y: young (i.e. one year old) males, O: old males. FY: farmyard, CP: cattle pasture, HP: horse pasture, SC: spring crops, AC: autumn crops, OG: other grassland. Numbers in parentheses refer to sample sizes.</p>1<p>Uniform demographic rates, i.e. estimated across all habitat types, were probability of breeding for young (0.645) and old males (0.995; see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0003006#s2" target="_blank">Methods</a> for details).</p>2<p>The number of fledglings shown here refers to the total number produced by a pair.</p>3<p>Estimated environmental variance component (estimation method differs between demographic rates; see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0003006#s2" target="_blank">Methods</a> for details). Data were insufficient to calculate environmental variance for probability of breeding.