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RESEARCH PRODUCT

Additional file 1 of Interspecific attraction between ground-nesting songbirds and ants: the role of nest-site selection

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Additional file 1: Table S1. The number of ant colonies on sample plots (3 × 3 m) that were centred on Wood Warbler Phylloscopus sibilatrix nests and controls in 2018-2020. Shown are the total number of sample plots on which ant colonies were searched for, and the percentage of sample plots on which a minimum of one ant colony was found. An ant colony was defined as a group of ants (workers and/or a queen with larvae or pupae) occupying a nest structure other than bird nest. Table S2. The mean daily ambient temperature (5-day average) and daily sum of rainfall (5-day sum) preceding Wood Warbler nest failure or chicks’ fledging, and the delay of bird nest collection from the field in 2018-2020. Table S3. Variables used in selection of candidate Generalised Linear Models with a binomial error distribution and ‘logit’ link function, and the subsequent model averaging, testing the effect of the thermal activity of birds within their nests (nest stage, delay of bird nest collection from the field), weather conditions (temperature, rainfall) and year (2018-2020) on the likelihood of an ant brood occurring in a Wood Warbler nest. Table S4. The results of simulations and bootstrapping (40000 replications) showing the expected mean percentage and 95 % confidence intervals (CI) of a simulated ant brood (larvae or pupae) falling within a hypothetical bird nest (i.e. 8 cm from the nest centre), in relation to the number of ant colonies present in a sample plot (3 × 3 m) that was centred on a hypothetical bird nest. The distance of 8 cm from the nest centre corresponded to the approximate radius of a Wood Warbler nest. Table S5. The number of Wood Warbler nests with and without ant broods in relation to the proximity (within 18 cm from the nest centre) of a tussock of vegetation (grass, sedge or fern), fallen branch (≥ 1 and < 5 cm diameter), or a tree log (≥ 5 cm diameter), or where these features were absent near the bird nests. Table S6. The percentage and total number (n) of Wood Warbler nests containing ant broods in early nest stage (egg-laying or incubation, or < 5 days post-hatching) and late nestling stage (≥ 5 days post-hatching), in 2018-2020. Table S7. The mean daily ambient temperature (5-day average) and daily sum of rainfall (5-day sum) preceding bird nest failure or chicks’ fledging, and the delay of bird nest collection from the field for the Wood Warbler nests where ant broods were present or absent. The comparison includes early nest stage (egg-laying or incubation, or < 5 days post-hatching) and late nestling stage (chicks ≥ 5 days old).