Nom scientifique: Vermivora chrysoptera
Global
1% of the global abundance. This threshold is used to identify tigger species and IBA's under A4i/ii and A4iv categories
Regional/Continental
1% of the regional/continental population Estimate
Regional SAR
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).
Sub-regional/National SAR
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) | ||
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Nombre | Année | Saison |
200 | 2000 | Été |