Birds

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Great Horned Owl (Bubo virginianus)

Citation:

Hawks, Owls and Wildlife

Author(s)
Craighead, John J. and Frank C. Craighead, Jr.
Pages
443
Publisher
Dover Publications, Inc.
Year
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Condition Lab
Dietary Composition white-footed mice (58.2%), meadow mice (28.0%), other small mammals (2.8%), medium sized mammals (5.1%), gamebirds and sm-med sized birds (4.8%), other birds (1.2%) percent occurrence of prey items in pellets Not Reported Not Reported 297 pellets from 14 owls Superior township Exposure Factor Datasets
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
Clutch or Litter Size 2.2 eggs/clutch Female Adult 4 nests Jackson Hole Exposure Factor Datasets
Hatching Success 11 percent of eggs that failed to hatch Not Reported Nestling 4 nests Jackson Hole Exposure Factor Datasets
Fledging or Weaning Rate 2 number of fledglings produced per pair fledglings/pair Not Reported Fledgling 4 nests Jackson Hole Exposure Factor Datasets
Territory Size observed range of movement during nesting, based on observations of individual or pair movements mi^2 Not Reported Adult 4 birds Jackson Hole Exposure Factor Datasets
Dietary Composition white-footed mice (3.6%), meadow mice (64.5%), shrews (0.3%), weasels (0.6%), red squirrel (0.3%), pocket gopher (23.5%), snowshoe rabbit (2.8%), ruffed grouse (1.4%) sage grouse (0.3%), mallard (0.6%), sm-med sized birds (1.4%), sucker (0.8%) percent occurrence of prey items in diet during nesting % Not Reported Not Reported 361 food items, 4 nests Jackson Hole Exposure Factor Datasets
Food Ingestion Rate averages of food amounts eaten per day g Both Male and Female Not Reported 2 birds Exposure Factor Datasets captive Laboratory
Citation:

Food habits of the horned and barn owls

Author(s)
Cunningham, John D.
Pages
222
Year
Volume
62
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location Type California Counties
Dietary Composition Neotoma fuscipes (7.9%), Thomomys bottae (20.7%), Mus musculus (25.0%), Microtus californicus (14.9%), Reithrodontomys megalotis (1.7%), Perognathus sp. (4.1%), Dipodomys agilis (4.3%), Peromyscus sp. (3.8%), Notiosorex crawfordi (0.3%), Sylvilagus sp. (0.8%), Sorex ornatus (0.1%), Scapanus latimanus (0.7%), Stenopelmatus sp (2.1%), Elgaria multicarinata (0.1%), unident. birds (4.3%) percent of total number of specimens identified in pellets Not Reported Not Reported 25 lbs of pellets Univ. of Calif., Los Angeles campus Exposure Factor Datasets Los Angeles
Dietary Composition Neotoma fuscipes (11.3), Thomomys bottae (36.2), Mus musculus (14.0), Microtus californicus (13.5), Reithrodontomys megalotis (8.7), Perognathus sp. (7.8), Dipodomys agilis (3.1), Peromyscus sp. (3.1), Notiosorex crawfordi (1.3), Sylvilagus sp. (0.5), Sorex ornatus (0.5) percent of total number of specimens identified in pellets Not Reported Not Reported Not Reported Santa Monica Mountains (1 ledge) Exposure Factor Datasets
Citation:

Growth development and reactions of young great horned owls

Author(s)
Reed, Bessie P.
Pages
14-31
Year
Volume
42
Exposure Endpoint Type Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Lab
Body Weight - Mean maximum body weights achieved by captively raised chicks oz Not Reported Juvenile 2 birds captured in Kansas Exposure Factor Datasets Laboratory
Citation:

Movements, population fluctuations, and mortality among great horned owls

Author(s)
Stewart, Paul A.
Pages
155-162
Year
Issue
2
Volume
81
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location Type Countries
Survival/ Mortality 31% mean annual mortality after the first year of banding based on band return data, 1951-1962 Not Reported Both Adults and Juveniles 97 birds Exposure Factor Datasets CANADA, USA
Survival/ Mortality 46% mean percent mortality within the first year of banding based on band return data, 1951-1962 Not Reported Juvenile 97 birds Exposure Factor Datasets CANADA, USA
Citation:

Predation by owls in the Sierran foothills of California

Author(s)
Fitch, Henry S.
Pages
137-151
Year
Volume
49
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type California Counties
Population Density density based on call counts birds/2000 ac Both Male and Female Both Adults and Juveniles 7 counts San Joaquin Experimental Range Exposure Factor Datasets Madera
Dietary Composition cottontail (61.1%), woodrat (17.9%), kangaroo rat (4.5%), pocket gopher (4.3%), gopher snake (3.7%), ground squirrel (2.4%), other spp (birds, reptiles, amphibians, invertebrates; 6.1%) percent occurrence by weight in pellets Not Reported Not Reported 654 pellets, 1471 prey items San Joaquin Experimental Range Exposure Factor Datasets Madera
Citation:

Red-tailed hawk and horned owl populations in Wisconsin

Author(s)
Orians, Gordon and Frank Kuhlman
Pages
371-385
Year
Volume
58
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
Citation:

Prey of nesting red-tailed hawks and great horned owls on Lostwood National Wildlife Refuge, northwestern North Dakota

Author(s)
Murphy, Robert K.
Pages
145-149
Year
Issue
3
Volume
55
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location Type
Dietary Composition meadow vole and jumping mouse (11.3%), juv. white-tailed jackrabbit (9.4%), horned or eared grebe (5.7%), American coot (22.6%), sora and Virginia rails (3.8%), duck (26.4%), sharp-tailed grouse (9.4%), blackbird (11.3%) relative frequency of prey species occurence in nests Not Reported Nestling 78 nest visits Lostwood National Wildlife Refuge Exposure Factor Datasets
Citation:

Size dimorphism and food habits of North American owls

Author(s)
Earhart, Caroline M., and Ned K. Johnson
Pages
251-264
Year
Volume
72
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Lab
Body Weight - Mean 914.2 (pallascens), 991.7 (pacificus), 1154.3 (occidentalis), 1317.8 (virgianus), 1238.6 (wapacuthu) Body weight means for 5 subspecies g Male Adult 10-26 individuals/subspecies Exposure Factor Datasets Laboratory
Body Weight - Mean 1142.2 (pallascens), 1312.4 (pacificus), 1555.1 (occidentalis), 1768.5 (virgianus), 1556.0 (wapacuthu) body weight means for 5 subspecies g Female Adult 12-29 individuals/subspecies Exposure Factor Datasets Laboratory
Citation:

Non-territorial 'floaters' in great horned owls: space use during a cyclic peak of snowshoe hares

Author(s)
Rohner, Christoph
Pages
901-912
Year
Volume
53
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Countries Error
Territory Size 4.83 mean territory size of territorial pairs square km Both Male and Female Adult 16 territories Kluane Lake (60 deg57'N, 138deg12'W), Yukon Exposure Factor Datasets CANADA 0.40 SE
Citation:

Food habits of the great horned owl (Bubo virginianus) in a Patagonian steppe in Argentina

Author(s)
Trejo, Ana, and Dora Grigera
Pages
306-311
Year
Issue
4
Volume
32
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location Type Countries
Dietary Composition rodents (98.5%), birds + insects + reptiles + lagomorphs (1.5%) percent of prey types in diet (seasonal average) Not Reported Adult 522 pellets near Bariloche, northwest. Patagonia Exposure Factor Datasets ARGENTINA
Citation:

A banding study of Cincinnati area great horned owls

Author(s)
Holt, John B., Jr.
Pages
194-197
Year
Issue
4
Volume
30
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Clutch or Litter Size 1-4 brood size at the time of banding young/nest Not Reported Juvenile 906 nests near Cincinnati Exposure Factor Datasets
Hatching Success 47.3% percent of nests with at least one young surviving to banding age (of all pairs observed) Not Reported Juvenile 1777 territories near Cincinnati Exposure Factor Datasets

Northern Flicker (Colaptes auratus)

Citation:

A monograph of the flicker (Colaptes auratus)

Author(s)
Burns, Frank L.
Pages
1-82
Year
Issue
31
Exposure Endpoint Type Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Countries
Clutch or Litter Size range of clutch sizes eggs/clutch Female Adult 191 clutches Exposure Factor Datasets USA
Citation:

A study of radio-equipped flickers

Author(s)
Royall, W.C., Jr., and O.E. Bray
Pages
47-50
Year
Issue
2
Volume
5
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Home Range range of home range size based on telemetry location data ha Not Reported Adult 4 birds, 20-99 radio fixes per bird Lakewood, Jefferson County Exposure Factor Datasets
Foraging Distance range of distances between night roost location and the following day's locations km Not Reported Adult 4 birds, 20-99 radio fixes per bird Lakewood, Jefferson County Exposure Factor Datasets
Body Weight - Mean 140 average body weight at time of capture g Not Reported Adult 4 birds Lakewood, Jefferson County Exposure Factor Datasets
Citation:

Notes on egg-laying, incubation, and nestling periods and of food brought to the nest by four species of cavity-nesting birds

Author(s)
Duyck, Bill E. and Douglas B. McNair
Pages
21-29
Year
Issue
2
Volume
55
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Clutch or Litter Size 8 first clutch size eggs/clutch Female Adult 1 nest Asheville, Buncombe County Exposure Factor Datasets
Duration of Incubation or Gestation 11 incubation period d Not Reported Embryo 1 nest Asheville, Buncombe County Exposure Factor Datasets
Citation:

Geographic variation in clutch size in the northern flicker (Colaptes auratus): support for Ashmole's hypothesis

Author(s)
Koenig, Walter D.
Pages
698-706
Year
Volume
101
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Error Lab
Clutch or Litter Size 6.5 average size of clutches existing in North American museum collections eggs/clutch Female Adult 411 clutches Exposure Factor Datasets 1.4 SD Laboratory
Citation:

Delayed nesting decreases reproductive success in northern flickers: implications for competition with European starlings

Author(s)
Ingold, Danny J.
Pages
321-326
Year
Issue
2
Volume
67
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Clutch or Litter Size 6.18 average size of clutches laid early in the breeding season eggs/clutch Female Adult 17 clutches New Concord, Muskingum County (40 deg, 00'N, 81 deg, 46'W) Exposure Factor Datasets
Clutch or Litter Size 4.71 average size of clutches laid late in the breeding season (1990-92,1994) eggs/clutch Female Adult 7 clutches New Concord, Muskingum County (40 deg, 00'N, 81 deg, 46'W) Exposure Factor Datasets
Hatching Success 5.27 average number of nestlings from clutches laid early in the breeding season (1990-1992, 1994) nestlings/clutch Not Reported Nestling 11 clutches New Concord, Muskingum County (40 deg, 00'N, 81 deg, 46'W) Exposure Factor Datasets
Hatching Success 3.25 average number of nestlings from clutches laid late in the breeding season (1990-1992, 1994) nestlings/clutch Not Reported Nestling 4 clutches New Concord, Muskingum County (40 deg, 00'N, 81 deg, 46'W) Exposure Factor Datasets
Fledging or Weaning Rate 5.09 average number of fledglings from clutches laid early in the breeding season (1990-1992, 1994) fledglings/clutch Not Reported Fledgling 11 clutches New Concord, Muskingum County (40 deg, 00'N, 81 deg, 46'W) Exposure Factor Datasets
Fledging or Weaning Rate 2.75 average number of fledglings from clutches laid late in the breeding season (1990-1992, 1994) fledglings/clutch Not Reported Fledgling 4 clutches New Concord, Muskingum County (40 deg, 00'N, 81 deg, 46'W) Exposure Factor Datasets
Citation:

Comparative reproductive success of yellow-shafted, red-shafted and hybrid flickers across a hybrid zone

Author(s)
Moore, William S. and Walter D. Koenig
Pages
42-51
Year
Volume
103
Exposure Endpoint Type Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Clutch or Litter Size range of mean clutch sizes measured among auratus ssp., cafer ssp., and auratus/cafer hybrid flickers eggs/clutch Female Adult 10-32 clutches per subspecies or hybrid group Lincoln, Morrill, Scottsbluff Counties, NE; Platte County, WY Exposure Factor Datasets
Hatching Success range of mean brood to clutch size ratios measured among male and female auratus ssp., cafer ssp., and auratus/cafer hybrid flickers Both Male and Female Adult 4-42 clutches per subspecies or hybrid group Lincoln, Morrill, Scottsbluff Counties, NE; Platte County, WY Exposure Factor Datasets
Citation:

Molt in flight feathers of flickers

Author(s)
Test, Frederick H.
Pages
63-72
Year
Volume
47
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location Type Lab
Time of Molt June-July date of onset of postjuvenal and adult molt Not Reported Both Adults and Juveniles 2500 birds Exposure Factor Datasets Laboratory
Citation:

Food of the woodpeckers of the United States

Author(s)
Beal, F.E.L.
Pages
7-64
Publisher
Government Printing Office
Year
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location Type Countries
Dietary Composition animal food (67.71%), vegetable food (32.26%) percent composition of stomach contents Not Reported Not Reported 183 birds Exposure Factor Datasets CANADA, USA
Dietary Composition predacious ground beetles (3.89%), other beetles (2.66%), ants (53.82%), Hemiptera (1.84%), caterpillars (2.12%), Orthoptera (1.45%), other insects and spiders (1.96%), grain (2.26%), seeds (19.59%), fruit (10.28%) percent composition of stomach contents Not Reported Not Reported 183 birds Exposure Factor Datasets CANADA, USA
Citation:

Northern Flicker (Colaptes auratus)

Author(s)
Moore, William S.
Pages
1-28
Publisher
The Academy of Natural Sciences; Philadelphia, PA: The American Ornithologists' Union, Washington, D.C.
Year
Exposure Endpoint Type Endpoint Value Sex Life Cycle Stage Sample Size Location Type Countries
Time of Migration or Dispersal review Not Reported Not Reported Not Reported Exposure Factor Datasets CANADA, USA
Dietary Composition review Not Reported Not Reported Not Reported Exposure Factor Datasets CANADA, USA
Population Density review Not Reported Not Reported Not Reported Exposure Factor Datasets CANADA, USA
Time of Mating/ Laying review Not Reported Not Reported Not Reported Exposure Factor Datasets CANADA, USA
Time of Mating/ Laying review Not Reported Not Reported Not Reported Exposure Factor Datasets CANADA, USA
Time of Fledging or Metamorphosis review Not Reported Not Reported Not Reported Exposure Factor Datasets CANADA, USA
Time of Molt review Not Reported Not Reported Not Reported Exposure Factor Datasets CANADA, USA
Duration of Incubation or Gestation review Not Reported Not Reported Not Reported Exposure Factor Datasets CANADA, USA
Age at Sexual Maturity review Not Reported Not Reported Not Reported Exposure Factor Datasets CANADA, USA
Growth Rate review Not Reported Not Reported Not Reported Exposure Factor Datasets CANADA, USA
Citation:

Population estimates of breeding birds in North Dakota

Author(s)
Stewart, Robert E., and Harold A. Kantrud
Pages
766-788
Year
Volume
89
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Population Density 1.26 (20) mean density of breeding birds (maximum density in parentheses) pairs/square mile Both Male and Female Adult 130 sample units (160 acres/unit) Exposure Factor Datasets
Citation:

The influence of starlings on flicker reproduction when both naturally excavated cavities and artificial nest boxes are available

Author(s)
Ingold, Danny J.
Pages
218-225
Year
Issue
2
Volume
110
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Error
Time of Nesting mid-April to early May time of nest excavation starts Both Male and Female Adult 40 pairs near New Concord Exposure Factor Datasets
Time of Fledging or Metamorphosis mid-June to late July Both Male and Female Juvenile 40 pairs near New Concord Exposure Factor Datasets
Time of Nesting early May to late June time of incubation Both Male and Female Adult 40 pairs near New Concord Exposure Factor Datasets
Clutch or Litter Size 7.44 mean clutch size eggs/clutch Female Adult 9 pairs near New Concord Exposure Factor Datasets 2.24 SD
Fledging or Weaning Rate 3.78 mean fledging rate fledglings/nest Both Male and Female Juvenile 40 pairs near New Concord Exposure Factor Datasets 2.99 SD

Willow Flycatcher (Empidonax traillii)

Citation:

Livestock management and productivity of willow flycatchers in the central Sierra Nevada

Author(s)
Valentine, Bradley E., Thomas A. Roberts, Stephen P. Boland and A. Peter Woodman
Pages
105-114
Year
Volume
24
Exposure Endpoint Type Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type California Counties
Clutch or Litter Size range of clutch sizes eggs Female Adult 6 nests Sierra National Forest Exposure Factor Datasets Fresno
Hatching Success range of hatching success eggs/nest Not Reported Hatchling 6 nests Sierra National Forest Exposure Factor Datasets Fresno
Citation:

A preliminary report on the biology of the willow flycatcher in the central Sierra Nevada

Author(s)
Stafford, Michael D. and Bradley E. Valentine
Pages
66-77
Year
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location Type California Counties
Time of Nesting May-August inclusive of pairing through departure from nesting territory Both Male and Female Adult 15 birds Sierra National Forest Exposure Factor Datasets Fresno
Fledging or Weaning Rate 50% proportion of nestlings known or believed to have fledged Both Male and Female Fledgling 8 nests Sierra National Forest Exposure Factor Datasets Fresno
Citation:

Traill's flycatcher breeding biology

Author(s)
Holcomb, Larry C.
Pages
50-68
Year
Issue
3
Volume
40
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Error
Clutch or Litter Size 3.68 mean first clutch size eggs Female Adult 31 nests Toledo, Wooster, OH Exposure Factor Datasets 0.1 SE
Clutch or Litter Size 3.14 mean clutch size in renests eggs Female Adult 29 nests Toledo, Wooster, OH Exposure Factor Datasets 0.1 SE
Duration of Incubation or Gestation 13.3 d Both Male and Female Embryo 28 nests Toledo, Wooster, OH Exposure Factor Datasets 0.1 SE
Age at Fledging, Metamorphosis, Weaning 12.3 d Both Male and Female Fledgling 82 chicks Toledo, Wooster, OH Exposure Factor Datasets 0.1 SE
Citation:

Effects of brood parasitism by brown-headed cowbirds on willow flycatcher nesting success along the Kern River, California

Author(s)
Harris, John H.
Pages
13-26
Year
Volume
22
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location Type California Counties
Fledging or Weaning Rate 16% Percent of nests that fledged young Not Reported Fledgling 19 nests Kern River Preserve Exposure Factor Datasets Kern
Citation:

Ecology of a Sierra Nevada population of willow flycatchers

Author(s)
Flett, Mary Anne and Susan D. Sanders
Pages
37-42
Year
Volume
18
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type California Counties Error
Time of Migration or Dispersal early to mid-June timing of arrival of spring migrants Both Male and Female Adult Not Reported Perazzo Meadows, Lacey Valley (32 km NW of Truckee) Exposure Factor Datasets Sierra
Time of Mating/ Laying mid-June time by which first eggs laid Both Male and Female Adult 11 nests Perazzo Meadows, Lacey Valley (32 km NW of Truckee) Exposure Factor Datasets Sierra
Time of Hatching or Parturition June 30 time by which first eggs hatched Both Male and Female Adult 11 nests Perazzo Meadows, Lacey Valley (32 km NW of Truckee) Exposure Factor Datasets Sierra
Time of Fledging or Metamorphosis July 15-August 13 dates on which first and last young fledged Both Male and Female Adult 11 nests Perazzo Meadows, Lacey Valley (32 km NW of Truckee) Exposure Factor Datasets Sierra
Time of Migration or Dispersal August 31 date by which last fall migrants departed Both Male and Female Adult Not Reported Perazzo Meadows, Lacey Valley (32 km NW of Truckee) Exposure Factor Datasets Sierra
Fledging or Weaning Rate 1.3 average number of fledglings per nest fledglings/nest Not Reported Fledgling 11 nests Perazzo Meadows, Lacey Valley (32 km NW of Truckee) Exposure Factor Datasets Sierra 1.3 SD
Fledging or Weaning Rate 29% total egg-to-fledgling success rate Not Reported Fledgling 5 nests Perazzo Meadows, Lacey Valley (32 km NW of Truckee) Exposure Factor Datasets Sierra
Hatching Success 24/31 total number of eggs hatched relative to estimate of total eggs laid eggs hatched/eggs laid Not Reported Nestling 11 nests Perazzo Meadows, Lacey Valley (32 km NW of Truckee) Exposure Factor Datasets Sierra
Territory Size 3000 average territory size of paired males based on observed perch locations m^2 Male Adult 8 territories Perazzo Meadows, Lacey Valley (32 km NW of Truckee) Exposure Factor Datasets Sierra 2000 SD
Citation:
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Error
Clutch or Litter Size 3.68 mean clutch size in first nests eggs/nest Female Adult 31 nests Wooster and Toledo, OH; Fremont, NE Exposure Factor Datasets 0.1 SE
Clutch or Litter Size 3.14 mean clutch size in renests eggs/nest Female Adult 29 nests Wooster and Toledo, OH; Fremont, NE Exposure Factor Datasets 0.1 SE
Citation:

Nest success and age-specific mortality in Traill's flycatchers

Author(s)
Holcomb, Larry C.
Pages
837-841
Year
Volume
89
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Fledging or Weaning Rate 36.4% percent of young fledged of total eggs laid Not Reported Fledgling 272 eggs, 91 nests Wooster, Toledo, OH; Fremont, NE Exposure Factor Datasets
Hatching Success 54.8 % percent of eggs hatched of total eggs laid Not Reported Hatchling 272 eggs, 91 nests Wooster, Toledo, OH; Fremont, NE Exposure Factor Datasets
Fledging or Weaning Rate 1.11 mean fledglings in nests of known numbers of eggs fledglings/nest Not Reported Fledgling 89 nests Wooster, Toledo, OH; Fremont, NE Exposure Factor Datasets
Survival/ Mortality see figure in citation figure showing percent survival over time of eggs and nestlings Not Reported Embryo, Nestling 272 eggs, 91 nests Wooster, Toledo, OH; Fremont, NE Exposure Factor Datasets
Citation:

A high incidence of brown-headed cowbird parasitism of willow flycatchers

Author(s)
Sedgwick, James A. and Fritz L. Knopf
Pages
253-256
Year
Volume
90
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location Type
Fledging or Weaning Rate 56.3% percent of unparasitized nests with at least one fledgling Not Reported Fledgling 16 nests Illinois River, Arapahoe National Wildlife Refuge (elev. 2,500 m) Exposure Factor Datasets
Fledging or Weaning Rate 18.2% percent of parasitized nests with at least one fledgling Not Reported Fledgling 11 nests Illinois River, Arapahoe National Wildlife Refuge (elev. 2,500 m) Exposure Factor Datasets
Citation:

Feeding-time minimization and the territorial behavior of the willow flycatcher (Empidonax traillii)

Author(s)
Prescott, David R.C. and Alex L.A. Middleton
Pages
17-28
Year
Volume
105
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Condition Countries Error
Clutch or Litter Size 4 first clutch size in 13/14 females observed eggs/nest Female Adult 14 females Badenoch Swamp, 14 km SE of Guelph (69 deg, 32'N, 80 deg, 13' W) Exposure Factor Datasets CANADA
Territory Size 3,009 mean territory size based on observed perch sites and territorial disputes m^2 Male Adult 61 observation periods Badenoch Swamp, 14 km SE of Guelph (69 deg, 32'N, 80 deg, 13' W) Exposure Factor Datasets breeding CANADA 153 SE
Dietary Composition Mollusca (4), Arachnida (19), Isopoda (4), Orthoptera (15), Hemiptera (56), Coleoptera (7), Lepidoptera adult (20), Lepidoptera larvae (10), Diptera adult (188), Hymenoptera adult (9), Hymenoptera larvae (1) numbers of food items delivered to nestlings fitted with neck ligatures Not Reported Nestling 333 food items collected Badenoch Swamp, 14 km SE of Guelph (69 deg, 32'N, 80 deg, 13' W) Exposure Factor Datasets CANADA
Citation:

The energetic consequences of incubation for two passerine species

Author(s)
Walsberg, Glenn E. and James R. King
Pages
644-655
Year
Volume
95
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Lab
Surface Area 0.00487 estimated area of the external plumage surface (geometrical approximation) of 13.2 g bird m^2 Not Reported Adult Not Reported Exposure Factor Datasets Laboratory
Body Weight - Mean 13.2 mean body weight during breeding season g Female Adult 5 birds collection location George E. Hudson Biological Reserve, Whitman County Exposure Factor Datasets Laboratory
Metabolic Rate 0.325 predicted daytime basal metabolic rate W Not Reported Adult Not Reported collection location George E. Hudson Biological Reserve, Whitman County Exposure Factor Datasets Laboratory
Metabolic Rate 0.241 predicted night time basal metabolic rate W Not Reported Adult Not Reported collection location George E. Hudson Biological Reserve, Whitman County Exposure Factor Datasets Laboratory
Citation:

Migration of the willow flycatcher along the middle Rio Grande

Author(s)
Yong, Wang, and Deborah M. Finch
Pages
253-268
Year
Issue
2
Volume
109
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Error
Time of Migration or Dispersal mid-May (onset), June 8 (date of last capture) spring passage Not Reported Adult 42 captures Rio Grand Nature Center (35deg07'N, 106deg41'W); Bosque del Apache National Wildlife Refuge (33deg48'N, 106deg52'W) Exposure Factor Datasets
Time of Migration or Dispersal mid-August (onset), September 16 (date of last capture) fall migration Not Reported Adult 42 captures Rio Grand Nature Center (35deg07'N, 106deg41'W); Bosque del Apache National Wildlife Refuge (33deg48'N, 106deg52'W) Exposure Factor Datasets
Body Weight - Mean 12.7 mean body weight of all birds (subspecies not separated) g Not Reported Adult 84 Rio Grand Nature Center (35deg07'N, 106deg41'W); Bosque del Apache National Wildlife Refuge (33deg48'N, 106deg52'W) Exposure Factor Datasets 1.2 SD
Body Fat (total or %) 1 (8%) to 2.4 (20%) total fat mass in birds with 8% or 20% fat-free body mass g Not Reported Adult 8-42 captures per habitat type Rio Grand Nature Center (35deg07'N, 106deg41'W); Bosque del Apache National Wildlife Refuge (33deg48'N, 106deg52'W) Exposure Factor Datasets
Body Weight - Mean 13.31 mean body weight of adastus subspecies g Not Reported Adult 9 captures Rio Grand Nature Center (35deg07'N, 106deg41'W); Bosque del Apache National Wildlife Refuge (33deg48'N, 106deg52'W) Exposure Factor Datasets 1.19 SD
Body Weight - Mean 12.59 mean body weight of brewsteri subspecies g Not Reported Adult 33 captures Rio Grand Nature Center (35deg07'N, 106deg41'W); Bosque del Apache National Wildlife Refuge (33deg48'N, 106deg52'W) Exposure Factor Datasets 1.13 SD
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