Figure 4.

Associations between climate and long-tailed tit phenology in the Rivelin Valley, Sheffield (1995–2011), showing relationships from model averaged estimates holding other variables at mean values. (A) median lay date of first attempts advances with warmer March temperature (slope = −3.40 ± 0.74, partial r² = 0.58); (B) median lay date of renest attempts advances with warmer April temperature (slope = −2.74 ± 1.18, partial r² = 0.35); (C) termination date advances with warmer April temperature (slope = −2.79 ± 1.21, partial r² = 0.32). Day 1 represents 1 March.