Least Bell's Vireo (Vireo bellii ssp. pusillus)
Least Bell's Vireo (Vireo bellii ssp. pusillus)
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Sample Size | Location | Type |
|---|---|---|---|---|---|---|---|---|
| Fledging or Weaning Rate | 21 | percent of active nests that fledged at least one young | % | Both Male and Female | Adult | 14 nests | various CA locations | Exposure Factor Datasets |
| Population Density | number of singing males per linear km of suitable habitat | birds/km | Male | Adult | 8 survey sites | various CA locations | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Sample Size | Location | Type | Lab |
|---|---|---|---|---|---|---|---|---|---|
| Duration of Incubation or Gestation | approx. 15 | incubation period up to time of pipping | d | Not Reported | Embryo | 8 eggs | Exposure Factor Datasets | Laboratory |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Sample Size | Location | Type | California Counties |
|---|---|---|---|---|---|---|---|---|---|
| Territory Size | nesting territory size | ha | Both Male and Female | Adult | 43-48 pairs (2 yrs) | Gibraltar Reservoir | Exposure Factor Datasets | Santa Barbara | |
| Population Density | range of nesting density over two years | pairs/243 ha | Both Male and Female | Adult | 43-48 pairs (2 yrs) | Gibraltar Reservoir | Exposure Factor Datasets | Santa Barbara | |
| Fledging or Weaning Rate | percent of nesting pairs that successfully raised at least one young (range over two years) | % | Both Male and Female | Adult | 43-48 pairs (2 yrs) | Gibraltar Reservoir | Exposure Factor Datasets | Santa Barbara | |
| Hatching Success | range in proportions of total eggs hatching vs. total eggs laid (for two years) | eggs hatched/eggs produced | Not Reported | Hatchling | 238-262 eggs (two yrs) | Gibraltar Reservoir | Exposure Factor Datasets | Santa Barbara | |
| Fledging or Weaning Rate | range in proportions of total chicks fledging vs. total chicks hatched (for two years) | chicks fledged/chicks hatched | Not Reported | Fledgling | 147 eggs hatched (2 yrs) | Gibraltar Reservoir | Exposure Factor Datasets | Santa Barbara | |
| Clutches or Litters per year | annual clutch numbers per pair observed over 2 years | clutches/yr | Both Male and Female | Adult | 43-48 pairs (2 yrs) | Gibraltar Reservoir | Exposure Factor Datasets | Santa Barbara | |
| Foraging Distance | up to several hundred yards | maximum observed distance travelled by birds from the nest | Both Male and Female | Adult | 32 pairs (1 yr) | Gibraltar Reservoir | Exposure Factor Datasets | Santa Barbara | |
| Time of Migration or Dispersal | mid Jul to early Sep | period of departure from the breeding area by migrants | Both Male and Female | Both Adults and Juveniles | Not Reported | Gibraltar Reservoir | Exposure Factor Datasets | Santa Barbara |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Sample Size | Location | Type | California Counties |
|---|---|---|---|---|---|---|---|---|---|
| Fledging or Weaning Rate | 63 | percent of birds that successfully fledged one young | % | Male | Adult | 98 birds | Gibraltar Reservoir | Exposure Factor Datasets | Santa Barbara |
| Fledging or Weaning Rate | 66 | percent of birds that successfully fledged one young | % | Female | Adult | 98 birds | Gibraltar Reservoir | Exposure Factor Datasets | Santa Barbara |
| Survival/ Mortality | 48/312 | proportion of young banded as nestlings or fledglings returning to study area in subsequent yrs | birds returning/birds banded | Both Male and Female | Juvenile | 312 birds | Gibraltar Reservoir | Exposure Factor Datasets | Santa Barbara |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Sample Size | Location | Type |
|---|---|---|---|---|---|---|---|
| Population Density | review | historical and recent population data | Not Reported | Adult | Not Reported | Exposure Factor Datasets | |
| Fledging or Weaning Rate | review | reproductive success data | Adult | Not Reported | Exposure Factor Datasets |
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