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| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| 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 Value | Endpoint Description | Error | Range | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|---|---|
| Hatching Success | 1.73 | average number of chicks per successful brood | 0.78 SD | 1-3 | chicks/brood | Not Reported | Hatchling | Baja California peninsula | 119 broods | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Description | Range | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Population Density | number of breeding birds per km of sandy beach surveyed | 0.24-2.51 | birds/km | Not Reported | Not Reported | mainland coast | 54.5-200.2 km per survey region | Exposure Factor Datasets |
| Population Density | number of wintering birds per km of sandy beach surveyed | 0.45-7.73 | birds/km | Not Reported | Not Reported | mainland coast | 54.5-200.2 km per survey region | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Description | Range | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Population Density | range (over 4 years) in maximum number of nests active on one day per total area of potential nesting habitat | 0.054-0.275 | nests/ha | Both Male and Female | Adult | Howard Slough, Great Salt Lake | 4 survey years | Exposure Factor Datasets |
| Population Density | range (over 4 years) in maximum number of nests active on one day per total area of potential nesting habitat | 0.078-0.493 | nests/ha | Both Male and Female | Adult | West Layton Marsh, Great Salt Lake | 4 survey years | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|
| Time of Migration or Dispersal | early March to April 26 | period during which most color-banded birds left the study area | Not Reported | Adult | Pajaro Dunes, Monterey Bay | 19 birds | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Sample Size | Type |
|---|---|---|---|---|---|---|
| Time of Migration or Dispersal | early to late March | timing of first influx of spring migrants to interior breeding areas | Not Reported | Adult | Not Reported | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Survival/ Mortality | 0.687 | estimated average annual adult survival probability (using Jolly-Seber model) | Both Male and Female | Adult | Great Salt Lake | 361 birds captured over 3 yrs | Exposure Factor Datasets | |
| Longevity | 2.7 | mean life expectancy for an adult plover, based on survival estimate | yr | Both Male and Female | Adult | Great Salt Lake | 361 birds captured over 3 yrs | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Range | Units | Sex | Life Cycle Stage | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Water Ingestion Rate | 20 | daily distilled water consumption as percent of body weight | % | Not Reported | Adult | Not Reported | Exposure Factor Datasets | |
| Body Weight - Mean | range in average body weights of treatment groups | 33.2-34.0 | g | Not Reported | Adult | 3-4 birds/group | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Description | Range | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Fledging or Weaning Rate | range of fledging rates, 2 years | 7/16 to 63/58 | fledglings/nests | Not Reported | Fledgling | Cuixmala Beach [19 deg, 22'14"N, 104 deg 59'31"W] | 16-58 nests/year | Exposure Factor Datasets |
| Hatching Success | range of egg hatching rates, 2 years | 34.4-48.9 | % | Not Reported | Hatchling | Cuixmala Beach [19 deg, 22'14"N, 104 deg 59'31"W] | 16-58 nests/year | 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 | late Apr | time of arrival at breeding grounds | Both Male and Female | Adult | Sunset Aquatic Park, Huntington Beach; Santa Margarita Lagoon | 2 colonies | Exposure Factor Datasets | |||
| Clutches or Litters per year | 1 | normal number of broods per year | Both Male and Female | Adult | Sunset Aquatic Park, Huntington Beach; Santa Margarita Lagoon | Not Reported | Exposure Factor Datasets | |||
| Time of Mating/ Laying | May-Jul | period of egg laying, 2 years | Female | Adult | Sunset Aquatic Park, Huntington Beach | 2 colonies | Exposure Factor Datasets | |||
| Clutch or Litter Size | 2 | most frequent clutch size, 2 years | 1-3 | Female | Adult | Sunset Aquatic Park, Huntington Beach | 96 nests | Exposure Factor Datasets | ||
| Duration of Incubation or Gestation | 22 | most frequent incubation period, 2 years | 20-25 | d | Not Reported | Embryo | Sunset Aquatic Park, Huntington Beach | 41 clutches | Exposure Factor Datasets | |
| Hatching Success | range of hatching success, 2 years | 80-90 | % | Not Reported | Hatchling | Sunset Aquatic Park, Huntington Beach | 53-157 eggs/year | Exposure Factor Datasets | ||
| Body Weight - Mean | 5.93 | mean body weight of day 0 chicks | 0.09 2SE | g | Not Reported | Hatchling | Sunset Aquatic Park, Huntington Beach | 77 birds | Exposure Factor Datasets | |
| Body Weight - Mean | 39.62 | asymptotic body weight of juveniles at 15 days of age | 0.73 2SE | g | Not Reported | Fledgling | Sunset Aquatic Park, Huntington Beach | 8 birds | Exposure Factor Datasets | |
| Time of Migration or Dispersal | first two wks Apr | timing of dispersal from breeding areas | Both Male and Female | Both Adults and Juveniles | Sunset Aquatic Park, Huntington Beach | 1 colony | Exposure Factor Datasets | |||
| Age at Fledging, Metamorphosis, Weaning | 20 | approximate age of fledging (first flight) | d | Not Reported | Fledgling | Sunset Aquatic Park, Huntington Beach | 2 birds | Exposure Factor Datasets | ||
| Survival/ Mortality | proportion of hatched birds that survived during post-fledging period, 2 years | 11-33 | % | Not Reported | Hatchling | Sunset Aquatic Park, Huntington Beach | 42-140 hatched birds/year | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Location | Sample Size | Type |
|---|---|---|---|---|---|---|---|---|
| Time of Mating/ Laying | May-early Jul (first wave), late May-Aug (second wave) | nesting periods of early (first wave) and late (second wave) birds | Both Male and Female | Adult | NASA Island, Seal Beach National Wildlife Refuge | 8-10 pairs (first wave), 29 pairs (second wave) | Exposure Factor Datasets | |
| Fledging or Weaning Rate | 0.50 (first wave), 0.58 (second wave) | mean number of fledglings produced per nesting pair | fledglings/pair | Not Reported | Fledgling | NASA Island, Seal Beach National Wildlife Refuge | 10 nests (first wave), 33 nests (second wave) | Exposure Factor Datasets |
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