This readme.txt file was generated on 2021-02-14 by Lisa Horn


GENERAL INFORMATION

1. Title of Dataset: Weak evidence of carry-over effects of overwinter climate and habitat productivity on spring passage of migratory songbirds at a northern stopover site in Ontario 

2. Author Information
	A. Corresponding Author Contact Information
		Name: Lisa Horn 
		Institution: York University 
		Address: 4700 Keele Street, Toronto, ON, Canada, M3J 1L3
		Email: lisa.horn@hotmail.ca 

	B. Alternate Contact Information
		Name: Bridget Stutchbury
		Institution: York University
		Address: 4700 Keele Street, Toronto, ON, Canada, M3J 1L3
		Email: bstutch@yorku.ca

3. Date of data collection (range): 1982-2015 

4. Geographic location of data collection: 
		Bird response variables obtained through bird banding data provided by Long Point Bird Observatory in Ontario, Canada (42.5831°N, 80.3985°W) 
		Normalized Difference Vegetation Index (NDVI) data covers species-specific tropical overwintering areas


SHARING/ACCESS INFORMATION

1. Licenses/restrictions placed on the data: 
		Original bird banding data from Long Point Bird Observatory should be requested from NatureCounts: https://bsc-eoc.org/birdmon/default/datasets.jsp?code=CMMN-BAND-LPBO

2. Was data derived from another source? yes
	A. If yes, list source(s): 
		Oceanic Nino Index values available from the National Oceanic and Atmospheric Administration (NOAA): https://origin.cpc.ncep.noaa.gov/products/analysis_monitoring/ensostuff/ONI_v5.php
		NDVI data derived from the Global Inventory Modelling and Mapping Studies NOAA Advanced Very High Resolution Radiometer dataset: https://ecocast.arc.nasa.gov/data/pub/gimms/3g.v1/
		Range of NDVI data based on species range maps provided by BirdLife International (request dataset here: http://datazone.birdlife.org/species/requestdis) and refined based on methods described in supplemental materials of Horn et al. 2021
		Historic monthly summaries of weather data obtained from: https://climate-change.canada.ca/climate-data/#/monthly-climate-summaries


DATA & FILE OVERVIEW

1. File List: 
		Horn et al 2021 data: individual-level data originating from bird banding records for seven focal species, as well as environmental variables


METHODOLOGICAL INFORMATION

1. Description of methods used for collection/generation/processing of data: 
		Please see Horn et al 2021 (Weak evidence of carry-over effects of overwinter climate and habitat productivity on spring passage of migratory songbirds at a northern stopover site in Ontario) published in the Condor: Ornithological Applications for a detailed description of methodology  


DATA-SPECIFIC INFORMATION FOR: Horn et al 2021 data

1. Variable List: 

		Species: the 4 letter ornithological code for each study species. AMRE: American Redstart; BTBW: Black-throated Blue Warbler; OVEN: Ovenbird; REVI: Red-eyed Vireo; SWTH: Swainson's Thrush; WOTH: Wood Thrush; YWAR: Yellow Warbler
		Sex: M - Male; F - Female
		Age: SY - Second Year; ASY - After Second Year
		BCI: body condition index 
		PassageDate: Spring passage date (as ordinal date) 
		Year: 1982-2015
		NDVI: a yearly mean value of the Normalized Difference Vegetation Index for a given species' overwintering range during the pre-migratory period (15 February - 31 March)
		ONI: Oceanic Nino Index
		MayTemp: monthly summary of mean temperature (°C) in May near the area of capture in southern Ontario
		MayPrecip: monthly summary of total precipitation (mm) in May near the area of capture in southern Ontario
		TempStation: Station name where monthly temperature summary was acquired from (https://climate-change.canada.ca/climate-data/#/monthly-climate-summaries)
		PrecipStation: Station name where monthly precipitation summary was acquired from (https://climate-change.canada.ca/climate-data/#/monthly-climate-summaries)

2. Missing data codes: 
		NA. Note: age and sex data marked as NA for all species except for American Redstart and Yellow Warbler, as age and sex data were only used in models for these two species


