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Fig. S1. Map of study areas Appendix S1. Summary of sampling by season and study area for the study fields. Closed circles indicate where all 48 fields were sampled, open circles indicate where 24 fields were sampled. Appendix S2. Results of logistic regression analyses for winter birds using presence of each species as the dependent variable. Analyses have been completed separately for Bucks and Devon. In all cases field area was entered into the model and significant results are shown for variables having an effect independently of field area. Only significant results are shown for each region with * P<0.05, **P<0.01 and if no significant results occurred in a particular season/region combination the data are not shown. The seasons and years in which relationships were tested appear after each variable name (B = Bucks, D=Devon and the number refers to the winter in which data were collected, e.g. 1999 = 1999/2000 winter). Blocked out cells indicate inappropriate food resources. Species codes are given in Fig. 2. Appendix S3. Results of logistic regression analyses for birds in summer using presence of each species as the dependent variable. In all cases field area was entered into the model and significant results are shown for variables having an effect independently of field area. Analyses have been completed separately for each season separately in Bucks and Devon. Only significant results are shown for each region with * P<0.05, **P<0.01 and if no significant results occurred in a particular season/region combination the data are not shown. The seasons and years in which relationships were tested appear after each variable name (B = Bucks, D=Devon, and the number refers to the year in which data were collected). Blocked out cells indicate inappropriate food resources. Species codes are given in Fig. 2.

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