Table 1.

Parameters used in predicting long-term population trends of UK farmland birds.

parameter	description
body size	natural log average male and female body size
annual productivity	number of clutches per year multiplied by average clutch size
migration strategy	categorical variable of resident and long-distance migrant
niche position	indication of how ‘typical’ resource use is compared to other community members. Natural logged.
niche breadth	measure of diversity of habitat types occupied. Natural logged.
relative brain size	residuals of log–log body–brain RMA regression, including a grade shift (see Electronic Appendix, part B)
relative telencephalon size	residuals of log–log body–telencephalon RMA regression, including a grade shift
relative brain stem size	residuals of log–log body–brain stem RMA regression
relative cerebellum size	residuals of log–log body–cerebellum RMA regression
relative optical lobe size	residuals of log–log body–optical lobe RMA regression