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| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Dietary Composition | Dipodomys sp (8-18%), Perognathus sp (4-29%), insects (53-75%), crayfish (0-9%), reptiles (0-5%), birds (0-1%) | frequency of occurence in pellets | Both Male and Female | Adult | Coachella Valley | 3 burrows | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Dietary Composition | vertebrates (14.3%), invertebrates (85.7%) | percent of diet based on pellet analysis | Both Male and Female | Adult | Malheur county | 150 pellets | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Description | Range | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Population Density | breeding season density based on roadside censuses | 12-13 | birds/mi^2 | Both Male and Female | Adult | Imperial Valley | Not Reported | Exposure Factor Datasets |
| Population Density | fall/winter season density based on roadside censuses | 3-4 | birds/mi^2 | Both Male and Female | Adult | Imperial Valley | Not Reported | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Population Density | 925 | estimate of number of pairs in census area | pairs/43,235 km^2 | Both Male and Female | Not Reported | San Francisco Bay and Central Valley areas | 198 UTM blocks censused | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Fledging or Weaning Rate | 50-57% | percent of occupied nests that fledged young | Both Male and Female | Adult | Gilliam, Morrow, and Umatilla counties | 63-76 nests | Exposure Factor Datasets |
| Dietary Composition | arthropods (92%), vertebrates (8%) | percent occurrence in diet based on pellet analysis | Both Male and Female | Not Reported | Gilliam, Morrow, and Umatilla counties | 5,559 pellets | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Dietary Composition | vertebrate (86.7%), invertebrate (13.3%) | diet composition by percent biomass in pellets | Both Male and Female | Adult | Columbia Basin | pellets 5,559 | Exposure Factor Datasets |
| Dietary Composition | vertebrate (89.9%), invertebrate (10.1%) | diet composition by percent biomass in pellets | Both Male and Female | Adult | Columbia Basin | 769 pellets | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Range | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|---|
| Clutch or Litter Size | 8-12 | eggs/clutch | Female | Adult | Umatillo and Morrow counties | 4 burrows | Exposure Factor Datasets | ||
| Hatching Success | based on number of young observed at burrow | 80-91 | % | Both Male and Female | Hatchling | Umatillo and Morrow counties | 4 burrows | Exposure Factor Datasets | |
| Time of Mating/ Laying | April | Female | Adult | Umatillo and Morrow counties | 4 burrows | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Error | Units | Sex | Life Cycle Stage | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Population Density | 7.8 | based on Christmas bird counts 1954-1986 | 2.3 (SD) | per 1,000 mi | Both Male and Female | Both Adults and Juveniles | Not Reported | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Population Density | 2 | pairs/6669 ha | Both Male and Female | Adult | Columbia River | Not Reported | Exposure Factor Datasets |
| Fledging or Weaning Rate | 2.5 | young/occupied nest | Both Male and Female | Adult | Columbia River | Not Reported | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Dietary Composition | mammals (85), insects (170), birds (3), spiders (0), reptiles (1) | number of prey items found in sample pellets | Both Male and Female | Both Adults and Juveniles | Crooked River National Grassland | 60 pellets | Exposure Factor Datasets |
| Dietary Composition | mammals (28), insects (22) | number of prey items found in sample pellets | Both Male and Female | Both Adults and Juveniles | Crooked River National Grassland | 20 pellets | Exposure Factor Datasets |
| Dietary Composition | mammals (414), insects (259), birds (3), spiders (2) | number of prey items found in sample pellets | Both Male and Female | Both Adults and Juveniles | Crooked River National Grassland | 228 pellets | Exposure Factor Datasets |
| Dietary Composition | mammals (50), insects (108), birds (1) | number of prey items found in sample pellets | Both Male and Female | Both Adults and Juveniles | Crooked River National Grassland | 39 pellets | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Clutch or Litter Size | 78 | total number of young observed on study site | young/study site | Both Male and Female | Juvenile | Albuquerque | 15 pairs | Exposure Factor Datasets |
| Fledging or Weaning Rate | 4.9 | fledglings/pair | Both Male and Female | Fledgling | Albuquerque | 15 pairs | Exposure Factor Datasets | |
| Time of Migration or Dispersal | August (begin) | Both Male and Female | Both Adults and Juveniles | Albuquerque | 15 pairs | Exposure Factor Datasets | ||
| Time of Mating/ Laying | third week of March (begin) | Female | Adult | Albuquerque | 15 pairs | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Error | Range | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|---|---|
| Body Weight - Mean | 146 | 1.9 (SE) | g | Male | Adult | Rocky Mountain Arsenal National Wildlife Area | 38 birds | Exposure Factor Datasets | ||
| Body Weight - Mean | 156 | 3.6 (SE) | g | Female | Adult | Rocky Mountain Arsenal National Wildlife Area | 31 birds | Exposure Factor Datasets | ||
| Clutch or Litter Size | 4.38 | mean productivity | 2-10 | chicks/nesting territory | Both Male and Female | Adult | Rocky Mountain Arsenal National Wildlife Area | 33 nests | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Range | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|---|
| Dietary Composition | mammals (18.9%), birds (3.9%), insects (29.9%), vegetation (71.3%) | mean percent occurrence in pellets | Both Male and Female | Not Reported | Oakland Airport | 209 pellets | Exposure Factor Datasets | ||
| Dietary Composition | mammals (31.4%), birds (5.9%), insects (28.6%), vegetation (61.0%) | mean percent occurrence in pellets | Both Male and Female | Not Reported | Oakland Airport | 608 pellets | Exposure Factor Datasets | ||
| Dietary Composition | mammals (41.2%), birds (2.0%), insects (23.3%), vegetation (55.5%) | mean percent occurrence in pellets | Both Male and Female | Not Reported | Oakland Airport | 366 pellets | Exposure Factor Datasets | ||
| Dietary Composition | mammals (35.7%), birds (1.3%), insects (27.7%), vegetation (57.4%) | mean percent occurrence in pellets | Both Male and Female | Not Reported | Oakland Airport | 929 pellets | Exposure Factor Datasets | ||
| Body Weight - Mean | 172.0 | 145.0-191.3 | g | Male | Not Reported | Oakland Airport | 12 birds | Exposure Factor Datasets | |
| Body Weight - Mean | 168.0 | 125.6-210.0 | g | Female | Not Reported | Oakland Airport | 10 birds | Exposure Factor Datasets | |
| Territory Size | 1.98 | 0.1-4.0 | ac | Both Male and Female | Adult | Oakland Airport | 6 pairs | Exposure Factor Datasets | |
| Clutch or Litter Size | mean annual productivity | 1.7-2.2 | young/breeding adult | Both Male and Female | Adult | Oakland Airport | 18 birds | Exposure Factor Datasets | |
| Survival/ Mortality | 70 | % | Both Male and Female | Juvenile | Oakland Airport | 40 birds | Exposure Factor Datasets | ||
| Survival/ Mortality | 19 | % | Both Male and Female | Adult | Oakland Airport | 18 birds | Exposure Factor Datasets | ||
| Survival/ Mortality | 18 | % | Both Male and Female | Nestling | Oakland Airport | 40 birds | Exposure Factor Datasets | ||
| Time of Migration or Dispersal | Sep, Jan | Both Male and Female | Juvenile | Oakland Airport | Not Reported | Exposure Factor Datasets | |||
| Time of Molt | Jul (begin) | Both Male and Female | Adult | Oakland Airport | Not Reported | Exposure Factor Datasets | |||
| Fledging or Weaning Rate | proportion of nesting pairs that successfully fledged young (over two years) | 53.3-88.8 | % | Both Male and Female | Adult | Oakland Airport | 18 birds | Exposure Factor Datasets |
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