This codebook.txt file was generated on <2019/01/22> by Samuel F. Ward ------------------- GENERAL INFORMATION ------------------- 1. Title of Dataset: Anomalous outbreaks of an invasive defoliator and native bark beetle facilitated by warm temperatures, changes in precipitation, and interspecific interactions 2. Author Information Principal Investigator Contact Information Name: Samuel F Ward Email:ward225@purdue.edu 3. Time period of content: 2000-2017 4. Geographic location of data collection (where was data collected?): Minnesota, USA -------------------------- SHARING/ACCESS INFORMATION -------------------------- 1. Licenses/restrictions placed on the data: CC0 1.0 Universal (CC0 1.0) Public Domain Dedication 2. Links to publications that cite or use the data: Ward, Samuel F; Aukema, Brian H. (2019). Anomalous outbreaks of an invasive defoliator and native bark beetle facilitated by warm temperatures, changes in precipitation, and interspecific interactions. Ecography. https://doi.org/10.1111/ecog.04239 3. Was data derived from another source? If yes, list source(s): PRISM Climate Data (http://prism.oregonstate.edu/) Aerial detection survey polygons (publicly available from the USDA Forest Service and Minnesota Department of Natural Resources) -------------------------- METHODOLOGICAL INFORMATION -------------------------- 1. Description of methods used for collection/generation of data: All climate and disturbance agent data were processed using R, a free software environment for statistical computing and graphics. 2. Describe any quality-assurance procedures performed on the data: 3. People involved with sample collection, processing, analysis and/or submission: ----------------------------------------- DATA-SPECIFIC INFORMATION FOR: ----------------------------------------- 1. Number of variables: 32 2. Number of cases/rows: 75195 3. Variable List variable name description year year of aerial survey x coordinates in meters in x direction, NAD83 / UTM zone 15 projection y coordinates in meters in y direction, NAD83 / UTM zone 15 projection presence_defoliation presence/absence of larch casebearer defoliation in a cell in the current year presence_mortality presence of mortality, lagged by one year (e.g., if mortality was detected in 2003 in raw data, year 2002 would be assigned a 1; see associated publication for further explanation) neighborhood_total_rook first-order neighborhood; total number of cells out of the nearest four (i.e., first cell in each cardinal direction) that are positive for larch casebearer neighborhood_total_queen second-order neighborhood; total number of cells out of the nearest eight that are positive for larch casebearer t_minus_1 presence/absence of larch casebearer defoliation in a cell the previous year t_minus_2 presence/absence of larch casebearer defoliation in a cell two years prior neighborhood_total_rook_ELB first-order neighborhood; total number of cells out of the nearest four (i.e., first cell in each cardinal direction) that are positive for eastern larch beetle neighborhood_total_queen_ELB second-order neighborhood; total number of cells out of the nearest eight that are positive for eastern larch beetle t_minus_1_ELB presence/absence of tree mortality attributed to eastern larch beetle in a cell the previous year t_minus_2_ELB presence/absence of tree mortality attributed to eastern larch beetle in a cell two years prior Septmin_prev minimum monthly temperature (°C) in September of previous year Octtmin_prev minimum monthly temperature (°C) in October of previous year Novtmin_prev minimum monthly temperature (°C) in November of previous year Dectmin_prev minimum monthly temperature (°C) in December of previous year Jantmin minimum monthly temperature (°C) in January Febtmin minimum monthly temperature (°C) in February Martmin minimum monthly temperature (°C) in March Aprtmin minimum monthly temperature (°C) in April Maytmin minimum monthly temperature (°C) in May DD_from_Feb20_Nov30_prev degree-day accumulation (base = 5 °C) between 20 February and 30 November of the previous year Mar_ppt total precipitation in March (mm) Apr_ppt total precipitation in April (mm) May_ppt total precipitation in May (mm) first_day_of_flight ordinal day of year that accumulated degree-days (base = 5 °C) surpassed 120 first_frost_free_ordinal_day ordinal day of year that daily minimum temperature was above 0 °C DD_from_Jan1_Dec31 degree-day accumulation (base = 5 °C) across the entire year annual_ppt_prev3 total annual precipitation (mm) across previous 3 years annual_ppt_prev6 total annual precipitation (mm) across previous 6 years defoliation_prev presence/absence of defoliation by larch casebearer in current and previous year; integer defoliation_prev3 presence/absence of defoliation by larch casebearer in current and across previous three years; integer