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| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Error | Units | Sex | Life Cycle Stage | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Inhalation Rate | 19.1 | mean resting respiratory rate | 3.28 SD | #/min | Not Reported | Adult | 4 | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Error | Units | Sex | Life Cycle Stage | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Metabolic Rate | 0.343 | mean standard metabolic rate | 0.044 | ml O^2/g bw/hr | Female | Adult | 2 birds | Exposure Factor Datasets |
| Metabolic Rate | 0.566 | mean standard metabolic rate | 0.080 | ml o^2/g bw/hr | Male | Adult | 4 birds | Exposure Factor Datasets |
| Body Weight - Mean | 1,588 | mean body weight | 147 | g | Female | Adult | 2 birds | Exposure Factor Datasets |
| Body Weight - Mean | 1,229 | mean body weight | 106 | g | Male | Adult | 4 birds | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Metabolic Rate | 0.59 | average basal metabolic rate | cc O^2/g bw/hr | Not Reported | Adult | 3 birds | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Longevity | 20.7 | known age at time of death | yr | Not Reported | Adult | s. of Aberdeen, Saskatchewan | 1 bird | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Longevity | 28+ | age at time of death | yr | Female | Adult | Asiniboine Park Zoo, Winnipeg | 1 bird | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Population Density | 1 | estimated population density based on call counts | bird/100 acres | Not Reported | Adult | San Joaquin Experimental Range | 7 counts | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Error | Units | Sex | Life Cycle Stage | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Food Ingestion Rate | 26.58 | daily food intake on a mouse diet, dry weight basis | 4.08 | g/kg/d | Not Reported | Adult | 4 owls x 5 days = 20 owl days | Exposure Factor Datasets |
| Food Ingestion Rate | 26.37 | daily food intake on a turkey poult diet, dry weight basis | 6.33 SD | g/kg/d | Not Reported | Adult | 26 owl days | Exposure Factor Datasets |
| Body Weight - Mean | 1615 | mean of averaged body weights (10-13 weighings/bird) | g | Not Reported | Adult | 4 birds | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Location | Sample Size | 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 | 13 mi NE Fort Davis, Jeff Davis County | 1 owl | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Error | Units | Sex | Life Cycle Stage | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Food Ingestion Rate | 115 | weight consumed per day on an all chick diet | 16.9 SD | g/d | Not Reported | Adult | 4 owls | Exposure Factor Datasets |
| Food Ingestion Rate | 114 | weight consumed per day on an all hamster diet | 21.4 SD | g/d | Not Reported | Adult | 4 owls | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Dietary Composition | Dipodomys ordii (0.13%), Microtus montanus (0.14%), Perognathus parvus (0.02%), Peromyscus maniculatus (0.50%), Thomomys umbrinus (0.21%) | relative proportion of prey species in the diet, based on pellet analysis | Female | Adult | Gund Research Ranch, University of Nevada | 1 owl | Exposure Factor Datasets |
| Dietary Composition | Dipodomys ordii (0.11%), Microtus montanus (0.12%), Perognathus parvus (0.03%), Peromyscus maniculatus (0.63%), Thomomys umbrinus (0.10%) | relative proportion of prey species in the diet, based on pellet analysis | Male | Adult | Gund Research Ranch, University of Nevada | 1 owl | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Dietary Composition | mammals (47.0%), birds (5.2%), reptiles (15.7%), arachnids (8.7%), centipedes (7.0%), insects (16.5%) | percent of total numbers of prey items in diet, based on pellet analysis | Both Male and Female | Adult | El Comitan, Baja California Sur | 2 owls (49 pellets) | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Food Ingestion Rate | 62.6 | average daily consumption on an all mouse diet | g/d | Not Reported | Adult | collected in Larimer County, CO | 1 owl | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Dietary Composition | Sylvilagus spp. (1.0%), unident. lagomorphs (0.2%), Peromyscus maniculatus (42.%), Microtus monatus (23.7%), unident. rodents (2.9%), Myotis spp. (1.9%), unident. mammal (1.5%), Podiceps nigricollis (1.0%), unident. rail (0.2%), Larus californicus (1.7%), unident. owl (0.4%), unident. blackbird (0.4%), unident. large bird (4.6%), unident. medium bird (1.2%), unident. small bird (6.9%), unident. vertebrate (1.0%), insects (8.3%), scorpions (0.4%) | percent occurence of prey items in pellets | Not Reported | Not Reported | Paoha Island, Mono Lake | 219 pellets, 518 remains | Exposure Factor Datasets |
| Dietary Composition | Lepus californicus (0.2%), Sylvilagus spp. (6.0%), unident. lagomorphs (1.7%), Peromyscus maniculatus (69.2%), Microtus monatus (0.7%), Dipodomys spp. (0.6%), unident. rodents (0.4%), Myotis spp. (1.1%), unident. chiropteran (0.2%), unident. mammal (3.9%), Larus californicus (1.3%), unident. large bird (7.1%), unident. medium bird (1.1%), unident. small bird (0.9%), unident. vertebrate (4.3%), insects (1.5%) | percent occurence of prey items in pellets | Not Reported | Not Reported | Negit Island, Mono Lake | 188 pellets, 536 remains | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Dietary Composition | Microtus (66.7%), Peromyscus (27.6%), Dipodomys (1.1%), Sylvilagus (0.3%), Euphagus cyanocephalus (0.3%), Sorex (0.2%), Tadarida brasiliensis (0.2%), Mustela frenata (0.2%), unident. bird (1.4%), unident. small mammal (0.7%), insect (1.3%) | percent occurence of prey items in pellets | Not Reported | Not Reported | Tule Lake National Wildlife Refuge | 107 pellets | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Dietary Composition | Sylvilagus nuttallii (12.4%), Spermophilus washingtoni (0.4%), Thomomys talpoides (29.7%), Perognathus parvus (12.5%), Dipodomys ordii (1.4%), Reithrodontomys megalotis (0.3%), Peromyscus maniculatus (6.2%), Neotoma cinerea (2.1%), Microtus montanus (7.7%), Mus musculus (0.2%), unident. microtinae (4.5%), Mustela frenata (0.4%), Anas platyrynchos (2.6%), Phasianus colchicus (2.5%), Fulica americana (1.5%), Charadrius vociferus (0.2%), Tyto alba (10.7%), Sternella neglecta (0.2%), unident. Fringillidae (0.2%), unident. Passeriformes (1.2%), unident. snake (1.4%), Cyprinus carpio (1.3%), Stenopelmatus spp (0.2%) | percent of total prey biomass | Not Reported | Not Reported | Esquatzel Coulee, Franklin County | 234 pellets | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Dietary Composition | unident. snake (0.3%), Sylvilagus nuttallii (19.2%), Lepus californicus (14.3%), unident. leporid (16.1%), Spermophilus townsendii (0.6%), Thomomys townsendii (14.6%), Perognathus parvus (0.4%), Dipodomys ordii (11.1%), Reithrodontomys megalotis (0.2%), Peromyscus spp (2.3%), Neotoma cinerea (4.6%), Neotoma lepida (2.0%), unident. woodrat (0.3%), Microtus montanus (4.7%), Mus musculus (0.7%), Mustela frenata (0.1%), Falco sparverius (0.1%), Phasianus colchicus (1.9%), Callipepla californicus (0.1%), unident. galliform (0.4%), Fulica americana (0.4%), Columba livia (0.9%), Tyto alba (0.3%), Sturnus vulgaris (0.2%), unident. passerine (0.6%), unident. bid (3.4%) | occurence in diet as percent of total prey biomass, based on pellet analysis | Not Reported | Not Reported | Snake River Birds of Prey National Conservation Area (42 deg, 50'N, 115 deg, 50'W) | 14 nesting areas, 1472 prey items | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Growth Rate | see figures | figures showing weight increase and feather growth for 0-73 days of age | Not Reported | Nestling | collected in California | five owls | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Description | Range | Units | Sex | Life Cycle Stage | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Clutch or Litter Size | range of clutch sizes | 4-14 | eggs/clutch | Female | Adult | 191 clutches | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Surface Area | 241 | measured area of skin beneath feathers of 649.1 g bird, excluding beak and non-feathered portions of legs | cm^2 | Not Reported | Adult | 1 | Exposure Factor Datasets |
| Surface Area | 198 | measured area of the external plumage surface of 649.1 g bird, excluding beak and non-feathered portions of legs | cm^2 | Not Reported | Adult | 1 | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Fledging or Weaning Rate | 16% | Percent of nests that fledged young | Not Reported | Fledgling | Kern River Preserve | 19 nests | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Error | Range | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|---|---|
| Time of Migration or Dispersal | early to mid-June | timing of arrival of spring migrants | Both Male and Female | Adult | Perazzo Meadows, Lacey Valley (32 km NW of Truckee) | Not Reported | Exposure Factor Datasets | |||
| Time of Mating/ Laying | mid-June | time by which first eggs laid | Both Male and Female | Adult | Perazzo Meadows, Lacey Valley (32 km NW of Truckee) | 11 nests | Exposure Factor Datasets | |||
| Time of Hatching or Parturition | June 30 | time by which first eggs hatched | Both Male and Female | Adult | Perazzo Meadows, Lacey Valley (32 km NW of Truckee) | 11 nests | Exposure Factor Datasets | |||
| Time of Fledging or Metamorphosis | July 15-August 13 | dates on which first and last young fledged | Both Male and Female | Adult | Perazzo Meadows, Lacey Valley (32 km NW of Truckee) | 11 nests | Exposure Factor Datasets | |||
| Time of Migration or Dispersal | August 31 | date by which last fall migrants departed | Both Male and Female | Adult | Perazzo Meadows, Lacey Valley (32 km NW of Truckee) | Not Reported | Exposure Factor Datasets | |||
| Fledging or Weaning Rate | 1.3 | average number of fledglings per nest | 1.3 SD | 0-3 or 4 | fledglings/nest | Not Reported | Fledgling | Perazzo Meadows, Lacey Valley (32 km NW of Truckee) | 11 nests | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Range | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|---|
| Population Density | population density in a 360 km riparian corridor as indicated by song counts | 2-11 | singing males/yr | Male | Adult | Colorado River, Grand Canyon National Park | 6 sampling yrs | Exposure Factor Datasets | |
| Population Density | population density in a 360 km riparian corridor as indicated by active nest counts | 2-4 | nests found/yr | Both Male and Female | Adult | Colorado River, Grand Canyon National Park | 6 sampling yrs | Exposure Factor Datasets | |
| Time of Nesting | June 2-July 10 | estimated length of breeding season (period when eggs or young are in the nest) | Both Male and Female | Adult | Colorado River, Grand Canyon National Park | 6 sampling yrs | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Time of Nesting | June 1 | estimated beginning of nesting based on historic egg collections | Both Male and Female | Adult | coastal southern CA; Colorado River; upper San Pedro River, AZ | 187 dated egg sets | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Sample Size | Type |
|---|---|---|---|---|---|---|
| Time of Migration or Dispersal | May 15 | date of earliest arrival of spring migrants | Both Male and Female | Not Reported | Not Reported | Exposure Factor Datasets |
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