Great Horned Owl (Bubo virginianus)
Great Horned Owl (Bubo virginianus)
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Sample Size | Location | Type |
|---|---|---|---|---|---|---|---|---|
| Time of Nesting | Mar 12 - Jun 4 | period from earliest egg laying date to date of latest brood departure | Both Male and Female | Adult | 4 nests | Jackson Hole | Exposure Factor Datasets | |
| Time of Hatching or Parturition | Apr 14 | earliest hatching date | Not Reported | Nestling | 4 nests | Jackson Hole | Exposure Factor Datasets | |
| Population Density | 1 | density of nesting pairs | pair/3 mi^2 | Both Male and Female | Adult | 4 nests | Jackson Hole | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Sample Size | Location | Type |
|---|---|---|---|---|---|---|---|---|
| Population Density | pairs/mi^2 | Both Male and Female | Adult | 12-22 pairs (3 study years) | southern Green County | Exposure Factor Datasets | ||
| Time of Mating/ Laying | Feb 5-15 | peak period of egg laying | Female | Adult | 11-17 nests (3 study years) | southern Green County | Exposure Factor Datasets | |
| Fledging or Weaning Rate | mean number of fledglings produced per successful nest | fledglings/nest | Not Reported | Fledgling | 11-17 nests (3 study years) | southern Green County | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Sample Size | Location | Type |
|---|---|---|---|---|---|---|---|
| Dietary Composition | wolf spider (1), centipede (2), tarantula (3), grasshopper (1), walking stick (2) | numbers of prey items in stomach contents | Not Reported | Adult | 1 owl | 13 mi NE Fort Davis, Jeff Davis County | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Sample Size | Location | Type | Condition |
|---|---|---|---|---|---|---|---|---|---|
| Fledging or Weaning Rate | 1.1 | rate of production of young at least 4 weeks old | young/nest | Not Reported | Nestling | 16 nests | Pima and Pinal Counties | Exposure Factor Datasets | breeding |
| Fledging or Weaning Rate | 9/16 | fraction of nests that sucessfully raised at least one nestling to the age of 4 weeks | successful nests/total nests | Both Male and Female | Adult | 16 nests | Pima and Pinal Counties | Exposure Factor Datasets | breeding |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Sample Size | Location | Type | Error | Lab |
|---|---|---|---|---|---|---|---|---|---|---|
| Food Ingestion Rate | 115 | weight consumed per day on an all chick diet | g/d | Not Reported | Adult | 4 owls | Exposure Factor Datasets | 16.9 SD | Laboratory |
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