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. 2011 Sep 13;65(12):2305–2317. doi: 10.1007/s00265-011-1241-z

Table 2.

Models of the relationships between the distance a sedge warbler male shifts territory between season “t” and season “t + 1” (response variable in GLM analysis) and an explanatory binary variable describing a measure of breeding success (mating or nesting success in season “t”), the vegetation quality of season “t” territory, and the change of arrival date between consecutive seasons as covariates

Success measure Change between seasons Model Underlying relationships and data
Predictors for season “t Estimate SE t p r Previous-year success Mean distance (m) SD (n) F
Mating success (all males) 1st vs 2nd TWV −0.86 0.233 −3.69 0.0003 −0.20* (132)
Success −0.25 0.125 −1.97 0.051 0 310 365.4 (29) 7.98**
1 150 236.0 (103)
Δ arrival date 0.002 0.003 0.72 0.473
2nd vs 3rd TWV −0.08 0.381 −0.21 0.832 −0.19 (39)
Success −0.13 0.179 −0.72 0.479 0 147 132.9 (11) 0.51
1 118 120.0 (28)
Δ arrival date −0.005 0.007 −0.73 0.471
3rd vs 4th TWV −0.73 0.528 −1.38 0.198 −0.31 (14)
Success −0.60 0.315 −1.91 0.086 0 241 152.8 (3) 0.15
1 165 320.5 (11)
Δ arrival date −0.004 0.012 −0.35 0.732
 
Nesting success (mated males only) 1st vs 2nd TWV −0.83 0.277 −3.00 0.003 −0.09 (103)
Success −0.16 0.121 −1.32 0.189 0 215 328.8 (36) 4.40*
1 115 158.5 (67)
Δ arrival date 0.002 0.003 0.73 0.466
2nd vs 3rd TWV 0.137 0.536 0.26 0.800 0.01 (29)
Success −0.001 0.222 −0.01 0.995 0 111 101.3 (10) 0.04
1 120 128.3 (19)
Δ arrival date −0.001 0.010 −0.17 0.965
3rd vs 4th TWV −0.658 0.632 −1.04 0.332 −0.38 (11)
Success 0.012 0.356 0.03 0.974 0 79 32.8 (6) 0.95
1 268 480.5 (5)
Δ arrival date 0.002 0.021 0.11 0.912

Distance and territory quality were transformed (log10 and square root, respectively) in order to approximate a normal distribution. The second section of the table (underlying relationships and data) presents the basic relationships that underlie the model: correlation coefficients (r) of territory quality in the preceding year and the distance a sedge warbler male shifts territory between seasons, as well as the distance differences between males without (0) or with (1) mating or nesting success

TWV tall wetland vegetation, sum of cattail and reed area in a male's territory

*−0.01 < p < 0.05, **−p = 0.005