Table 5 Bird Reference (“BirdRef”) data of snowy plovers breeding in Bahía de Ceuta, Mexico, between 2006 and 2016.
From: CeutaOPEN, individual-based field observations of breeding snowy plovers Charadrius nivosus
Column | Data name | Description of data |
|---|---|---|
1. | species | species of plover (all snowy plover ‘SNPL’ in this case) |
2. | population | population at which family was observed (all ‘Ceuta’ in this case) |
3. | year | year during which family was observed |
4. | site | site at which family was observed |
5. | family | unique identifier of family (unique within year and within site). Families found as nests retain nest identifier found in Nests table, whereas families found as broods hatching from unknown nests have a negative brood identifier (e.g., ‘−2’) found in Broods table) |
6. | ID | a concatenation of year, site, and nest to make a unique family identifier across all sites and years |
7. | nest_initiation_date | estimated date when the first egg of the nest was laid (i.e., its ‘initiation’). The estimate is calculated by subtracting the age in days of the oldest egg (determined by the floatation scores ‘float1’, ‘float2’, and ‘float3’ defined in the Nests table) and a 5-day laying period for three-egg clutches or a 3-day laying period for two-egg clutches or a 1-day laying period for one-egg clutches (egg-laying intervals are based on ref. 34. Determining initiation dates of clutches found at stage ‘F’ is imprecise, and thus we estimated the initiation date by subtracting 25 days from the hatch date (i.e., the average length of incubation in this population) and an additional 5, 3, or 1 days for the laying period depending on the clutch size. For nests found at stage ‘F’ that failed before hatching, the nest initiation date is ‘NA’. Stored in the internal ‘Date’ format of R and represents the number of days since January 1, 1970, the ‘Unix epoch’. Converted easily in R using ‘as.Date(nest_initiation_date, origin = “1970-01-01”)’) |
8. | hatching_date | date nest hatched (stored in the internal ‘Date’ format of R and represents the number of days since January 1, 1970, the ‘Unix epoch’. Converted easily in R using ‘as.Date(hatching_date, origin = “1970-01-01”)’; ‘NA’ if nest fate was other than ‘hatch’ in Nests table) |
9. | male | metal ring alpha-numeric code of male parent observed with nest/brood |
10. | female | metal ring alpha-numeric code of female parent observed with nest/brood |
11. | chick1 | metal ring alpha-numeric code of first chick assigned to brood |
12. | chick2 | metal ring alpha-numeric code of second chick assigned to brood |
13. | chick3 | metal ring alpha-numeric code of third chick assigned to brood |
14. | exp | indication if family was part of an experiment |
15. | type | indication of type of experiment conducted |
16. | manip | date of possible experimental manipulation (stored in the internal ‘Date’ format of R and represents the number of days since January 1, 1970, the ‘Unix epoch’. Converted easily in R using ‘as.Date(manip, origin = “1970-01-01”)’) |
