Table 1 Description and details of data used for the relative index of occurrence (RIO) in this study for two goose species. Subregions are shown in Fig. 1.
Species and sample size details | Location and subregion in Study Area | Survey focus | Source | Time period | Observer | Comment |
|---|---|---|---|---|---|---|
(a) Training data | ||||||
Anser albifrons (n = 219; Broods present = 142, Broods absent = 77; Non-breeders present = 95 Non-breeders absent = 124) | Yakutia | Brood & Non-breeders | Boat | 2017, 2018 | IB | |
Chaun | Brood & Non-breeders | Boat | 2002 till 2019 | DS, AK | ||
Chukotka | Brood & Non-breeders | Aerial | 2002, | AK | ||
Chukotka: Koryak Highland | Brood & Non-breeders | Aerial | 1997 | AK | ||
Anser fabalis (n = 593; Broods present = 213, Broods absent = 380; Non-breeders present = 303, Non-breeders absent = 290) | Yakutia | Brood & Non-breeders | Boat | 2017, 2018 | IB | |
Chaun | Brood & Non-breeders | Boat | 2002 till 2019 | DS, AK | ||
Chukotka | Brood & Non-breeders | Aerial | 2002, | AK | ||
Chukotka: Koryak Highland | Brood & Non-breeders | Aerial | 1997 | AK | ||
Species | Source | Match with predictive model | Comment | |||
|---|---|---|---|---|---|---|
(b) Testing data | ||||||
Anser albifrons | GBIF presence (n = 63) | Good | These data are ‘just’ occurrences but indicate presence absence in the landscape | |||
Compiled literature presence absence (n = 14) | Good | These data are also ‘just’ presence/absence but carry some attributes on broods and non-breeders (not shown here). The source is from the literature and first-time presented as a GIS layer | ||||
Anser fabalis | GBIF presence (n = 17) | Good | These data are ‘just’ occurrences but indicate presence absence in the landscape | |||
Compiled literature presence absence (n = 18) | Good | These data are also ‘just’ presence/absence but carry some attributes on broods and non-breeders (not shown here). The source is from the literature and first-time presented as a GIS layer | ||||
