This DATA_OIK_08762_Readme.txt file was generated on 2021-11-16 by Markus Öst



GENERAL INFORMATION

1. Title of Dataset: Top-down effects override climate forcing on reproductive success in a declining sea duck 

2. Author Information
	A. Principal Investigator Contact Information
		Name: Markus Öst
		Institution: Åbo Akademi University
		Address: Tykistökatu 6, Åbo Akademi University, FI-20520 Turku, Finland
		Email: markus.ost@abo.fi

	
3. Date of data collection: 1990-2020 

4. Geographic location of data collection: Tvärminne Zoological Station (59°50′N, 23°15′E) and Hanko Bird Observatory (59°49′N, 22°54′E), Finland. 

5. Information about funding sources that supported the collection of the data:
Swedish Cultural Foundation in Finland (Grant nos. 168333, 158026, 149014, 138139, 17/3317, 16/1476, 15/3296, 14/2657, 13/2654) (to MÖ) 
The Academy of Finland (Grant nos. 275606 and 323527) (to AL) 
Sophie von Julins Stiftelse and the Finnish Ministry of Agriculture and Forestry (to the Nature and Game Management Trust Finland) 


SHARING/ACCESS INFORMATION

1. Licenses/restrictions placed on the data: None. 

2. Links to publications that cite or use the data: https://doi.org/10.1111/oik.08762


3. Was data derived from another source? No.
	 


DATA & FILE OVERVIEW

1. File List: 
DryadData_OIK_08762.csv

2. Are there multiple versions of the dataset? No.
	

METHODOLOGICAL INFORMATION

1. Description of methods used for collection/generation of data: 
See https://doi.org/10.1111/oik.08762 for methodological details.


DATA-SPECIFIC INFORMATION FOR: DryadData_OIK_08762.csv


1. Number of variables: 17.

2. Number of cases/rows: 31.

3. Variable List: 

YEAR = Year of observation (1990...2020)	
NAO = extended annual PC-based winter NAO (December–March) index	
Ice = the maximum ice extent of the Baltic Sea (unit: km2)	
Bodycondition = mean annual size-corrected body condition index at hatching of incubating female common eiders at Tvärminne (unitless; see https://doi.org/10.1111/oik.08762 for derivation of index)	
Bodycondition_IQR = annual interquartile range of size-corrected body condition indices of incubating female common eiders at Tvärminne (unitless)   	
FledglingProduction = annual ratio of nearly fledged ducklings per adult female common eider at Tvärminne (sum of brood-caring and solitary adult females)	
MedianLayDate = annual median laying date of female common eiders at Tvärminne (1 = 1 January)	
LayDate_IQR = annual interquartile range of laying dates of female common eiders at Tvärminne (unit: days)	
MeanClutchSize = annual mean clutch size of female common eiders at Tvärminne	
AdultPredationRisk = total annual number of incubating female common eiders killed at their nests at Tvärminne divided by the total number of nesting attempts in each year	
IslandPredationRisk = total annual number of depredated nests at first encounter at Tvärminne divided by the total number of nesting attempts	
EagleAbundance = total sum of daily numbers of resident white-tailed eagles observed at the Hanko Bird Observatory during 1 April–15 June in each year divided by the number of annual observation days during the same period	
Halias5MigrationDate = day of the year when the season’s cumulative sum of migrating common eiders at Hanko Bird Observatory reached 5%	(1 = 1 January)
Halias50MigrationDate = day of the year when the season’s cumulative sum of migrating common eiders at Hanko Bird Observatory reached 50% (1 = 1 January)		
MediaLay_50MigrationDate = time lapse between MedianLayDate and Halias50MigrationDate (unit: days)
PERIOD = period 1: 1990-2005; period 2: 2006-2020.	
Halias5MigrationDate_Halias50MigrationDate = time lapse between Halias5MigrationDate and Halias50MigrationDate (unit: days)



4. Missing data codes: 
Empty cells.