# Data underpinning "Phenotypic plasticity increases exposure to extreme climatic events that reduce individual fitness" --- These data come from the long-term individual-based study of great tits in Wytham Woods, Oxfordshire, UK. Breeding attempts occurring in 996 nestboxes are recorded each year following a standardised protocol. These datasets include information on the relative laying date and success of breeding attempts from 1965 onwards, alongside information on the number of extreme climatic events (ECEs) encountered by these broods in particular time windows (see below for details). ## Description of the data and file structure "Wytham_greti_breeding_with_ECE.csv" Breeding_attempt: unique identifier for each breeding attempt Nestbox: the nestbox ID that each breeding attempt corresponds to Year: the year in which a breeding attempt occurred Clutch_size: the maximum number of eggs recorded Num_chicks: the maximum number of hatched chicks recorded Num_fledglings: the number of chicks that successfully fledged January_laydate: the day of the year that the first egg in that breeding attempt was laid (1 = 1st January) Standardised_laydate: the breeding attempt's laying date expressed relative to the annual mean and scaled according to the annual SD Hot_ECE_num_period_1: the number of hot ECEs occurring between the day the last egg was laid and the day that the eggs hatched (see paper for ECE definitions) Cold_ECE_num_period_1: the number of cold ECEs occurring between the day the last egg was laid and the day that the eggs hatched (see paper for ECE definitions) Hot_ECE_num_period_2: the number of hot ECEs occurring between the day the eggs hatched and day 7 post-hatch (see paper for ECE definitions) Cold_ECE_num_period_2: the number of cold ECEs occurring between the day the eggs hatched and day 7 post-hatch (see paper for ECE definitions) Hot_ECE_num_period_3: the number of hot ECEs occurring between day 8 post-hatch and day 15 post-hatch (see paper for ECE definitions) Cold_ECE_num_period_3: the number of cold ECEs occurring between day 8 post-hatch and day 15 post-hatch (see paper for ECE definitions) Hot_ECE_num_period_4: the number of hot ECEs occurring between day 16 post-hatch and day 21 post-hatch (see paper for ECE definitions) Cold_ECE_num_period_4: the number of hot ECEs occurring between day 16 post-hatch and day 21 post-hatch (see paper for ECE definitions) Hot_ECE_yes_no_period_1: whether there was a hot ECE or not between the day the last egg was laid and the day that the eggs hatched (see paper for ECE definitions) Cold_ECE_yes_no_period_1: whether there was a cold ECE or not between the day the last egg was laid and the day that the eggs hatched (see paper for ECE definitions) Hot_ECE_yes_no_period_2: whether there was a hot ECE or not between the day the eggs hatched and day 7 post-hatch (see paper for ECE definitions) Cold_ECE_yes_no_period_2: whether there was a cold ECE or not between the day the eggs hatched and day 7 post-hatch (see paper for ECE definitions) Hot_ECE_yes_no_period_3: whether there was a hot ECE or not between day 8 post-hatch and day 15 post-hatch (see paper for ECE definitions) Cold_ECE_yes_no_period_3: whether there was a cold ECE or not between day 8 post-hatch and day 15 post-hatch (see paper for ECE definitions) Hot_ECE_yes_no_period_4: whether there was a hot ECE or not between day 16 post-hatch and day 21 post-hatch (see paper for ECE definitions) Cold_ECE_yes_no_period_4: whether there was a cold ECE or not between day 16 post-hatch and day 21 post-hatch (see paper for ECE definitions) Rain_ECE_num_period_1: the number of high rainfall ECEs occurring between the day the last egg was laid and the day that the eggs hatched (see paper for ECE definitions) Rain_ECE_num_period_2: the number of high rainfall ECEs occurring between the day that the eggs hatched and day 7 post-hatch (see paper for ECE definitions) Rain_ECE_num_period_3: the number of high rainfall ECEs occurring between day 8 post-hatch and day 15 post-hatch (see paper for ECE definitions) Rain_ECE_num_period_4: the number of high rainfall ECEs occurring between day 16 post-hatch and day 21 post-hatch (see paper for ECE definitions) "Wytham_annual_ECE_freq.csv" Year: the year from 1965 to 2020 Num_cold_ECEs: the number of cold ECEs between the 1st April and the 30th June (see paper for ECE definitions) Num_hot_ECEs: the number of hot ECEs between the 1st April and the 30th June (see paper for ECE definitions) ## Sharing/Access information Please do contact us if you plan on using the data to ensure you have access to all the data you need (what you see here is a subset of what is available) and that you understand its limitations.