Nom scientifique: Vermivora chrysoptera
1% of the global abundance. This threshold is used to identify tigger species and IBA's under A4i/ii and A4iv categories
1% of the regional/continental population Estimate
Solely IUCN Vulnerable listed species are presently eligible. The Regional threshold for these birds is static and standardized: Passeriformes (e.g. perching/songbirds) = 90 individuals (or 30 pairs); non-Passeriformes = 30 individuals (or 10 pairs).
The sub-regional/national SAR population threshold = 1% of the COSEWIC population estimate within the region (provinces/territories) the species is listed as being at risk. This threshold is used to identify trigger species and IBAs under criterion C1.
|Carden Alvar (ON040)|