Main agricultural practices likely to influence studied steppe bird food resources (seeds, plants, invertebrates and vertebrates) in different farming systems within the study area throughout the breeding season (spring: Sp and summer: Su).

Symbols −/+ indicate absence/presence of each practice and its key impacts on different food resources.*In the case of alfalfa negative effects of agricultural practices were only considered to affect seeds, invertebrates and vertebrates, but not plant material since the crop by itself could be consumed by plant-eaters.1Availability was calculated as 1/(n • f +1), where n is the number of agricultural practices that negatively affect food resource considered in calculations and f the production system intensity (measured by field yield). For fallows f was set to 1.