The laying date (LD) of the earliest first clutch was associated with local spring (minimum) temperatures but did not show a significant trend during the period considered.
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Climate warming induced a stretch of the breeding season and an increase of second clutches in a passerine breeding at its altitudinal limits.
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The sentences
We investigated (1) a possible shift in the average laying date (LD) and (2) a possible trend in the earliest and latest observed LD; we also estimated (3) the duration of the breeding period, that is, the time between the earliest and latest clutch recorded; (4) the yearly proportion of second clutches (SCs), and (5) the association between breeding output (BO), that is, number of fledglings, and climatic factors.