3aace99d-4e52-4597-86b3-03f420176cea JYV-1 Suvi Ruuskanen University of Jyväskylä

Jyväskylä 40500 Finland

suvi.k.ruuskanen@jyu.fi 0000-0001-5582-9455 creator-1 2026-01-07 This work is licensed under the 'Fully Open' license of SPI-Birds. This license allows Data Users to freely build upon, enhance and reuse the data for any purposes without restriction under copyright or database law. By selecting this license type, the Data Custodian waives all their copyright and related rights of their data to the fullest extent allowed by law. See https://github.com/SPI-Birds/documentation/blob/master/terms_and_conditions/SPI_Birds_Data_Licenses.pdf for term definition and more info. Jyväskylä, Finland 25.732 25.732 62.2378 62.2378 2021 2026 kingdom Animalia 1 N 202423 phylum Chordata 44 CH2 158852 class Aves 212 V2 174371 order Passeriformes 729 3RL 178265 family Paridae 9327 626B2 178697 genus Parus 2487923 6J9Z 178698 species Parus major Great tit 9705453 75SVV 45515267 561864 14640 kingdom Animalia 1 N 202423 phylum Chordata 44 CH2 158852 class Aves 212 V2 174371 order Passeriformes 729 3RL 178265 family Paridae 9327 626B2 178697 genus Cyanistes 2487875 3XN8 557599 species Cyanistes caeruleus Eurasian blue tit 2487879 32NH2 45515265 559612 14620 kingdom Animalia 1 N 202423 phylum Chordata 44 CH2 158852 class Aves 212 V2 174371 order Passeriformes 729 3RL 178265 family Muscicapidae 9322 CZN 178663 genus Ficedula 2492596 4JY9 178673 species Ficedula hypoleuca European pied flycatcher 2492606 6HWGP 45513708 560081 13490 annually creator-1 Tagging Birds were fitted with tags (i.e., metal leg ring) to monitor the development and life histories of individuals. Brood data Nests were visited regularly to collect breeding ecology variables (i.e., brood size, hatch date, lay date, clutch size, fledgling number). Individual data The following individual-level data were collected: physiological data, size (weight, wing, tarsus, etc.). Genetic data The following samples were taken for genetic analysis: blood. Environmental data The following abiotic variables were collected: temperature. Other activities The following activities were undertaken: experimental manipulations. creator-1 dataCustodian European Research Council, Research Council of Finland, Emil Aaltonen Foundation Woodland, forest and other wooded land Mixed deciduous and coniferous woodland Mixed Scots pine - birch woodland 120 ha The field study monitors artificial nest boxes, with a minimum of 460 and a maximum of 460 throughout the study period.