Willow Flycatcher (Empidonax traillii)

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Willow Flycatcher (Empidonax traillii)

Citation:

Age, habitat, and yearly variation in the diet of a generalist insectivore, the southwestern willow flycatcher.

Author(s)
Durst, S.L., Theimer, T.C., Paxton, E.H. and Sogge, M.K.
Issue
3
Volume
110
Exposure Endpoint Type Endpoint Value Endpoint Description Units Life Cycle Stage Sample Size Location Type Countries
Dietary Composition See citation Figure 1 & 4 Diet based on fecal samples Frequency detected Nestling 98 Roosevelt Lake Exposure Factor Datasets USA
Dietary Composition See citation Figures 1 & 3 Diet based on fecal samples Frequency detected Adult 100 Roosevelt Lake Exposure Factor Datasets USA
Citation:

Territoriality, site fidelity, and survivorship of Willow Flycatchers wintering in Costa Rica.

Author(s)
Koronkiewicz, T.J., Sogge, M.K. and Paxton, E.H.
Issue
3
Volume
108
Exposure Endpoint Type Endpoint Value Units Sex Life Cycle Stage Sample Size Location Type Countries Error
Home Range Chomes site: 0.48, Bolson site: 0.82 ha M Adult Chomes: 47, Bolson: 44 Chomes site: 10⁰05'N, 85⁰05'W, Bolson site: 10⁰20'N, 85⁰25'W Exposure Factor Datasets COSTA RICA Chomes site: 0.04, Bolson site: 0.08
Home Range Chomes site: 0.46, Bolson site: 0.77 F Adult Chomes: 69, Bolson: 25 Chomes site: 10⁰05'N, 85⁰05'W, Bolson site: 10⁰20'N, 85⁰25'W Exposure Factor Datasets COSTA RICA Chomes site: 0.05, Bolson site: 0.18
Citation:

Southwestern Willow Flycatcher populations in California: distribution, abundance, and potential for conservation.

Author(s)
Kus, B.E., Beck, P.P. and Wells, J.M.
Volume
26
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Location Type California Counties Countries
Population Density Review Pairs/site B Adult Exposure Factor Datasets Kern USA
Hatching Success Review Nest success B Embryo Exposure Factor Datasets Kern USA
Citation:

Survivorship across the annual cycle of a migratory passerine, the willow flycatcher.

Author(s)
Paxton, E.H., Durst, S.L., Sogge, M.K., Koronkiewicz, T.J. and Paxton, K.L.
Volume
48
Exposure Endpoint Type Endpoint Value Endpoint Description Units Location Type Countries
Survival/ Mortality Breeding grounds: 66 [64-69 (95%CI)], Wintering grounds: 65 [51-79 (95% CI)] Seasonal estimate % Breeding: Roosevelt Lake & San Pedro/Gila River confluence; wintering: Chomes site: 10⁰05'N, 85⁰05'W, Bolson site: 10⁰20'N, 85⁰25'W Exposure Factor Datasets USA
Survival/ Mortality Breeding grounds: 97 [96-97 (95%CI)], Wintering grounds: 96 [96-97 (95% CI)] Monthly estimate % Breeding: Roosevelt Lake & San Pedro/Gila River confluence; wintering: Chomes site: 10⁰05'N, 85⁰05'W, Bolson site: 10⁰20'N, 85⁰25'W Exposure Factor Datasets USA
Citation:

Food habits of the Southwestern Willow Flycatcher during the nesting season.

Author(s)
Drost, C.A., Paxton, E.H., Sogge, M.K. and Whitfield, M.J.
Volume
26
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type California Counties Countries
Dietary Composition Diptera: 74.6, Hemiptera: 64.4, Coleoptera: 52.5, Oldonata: 40.7, Hymenoptera/flying: 35.6, Cicadellidae: 35.6, Araneae: 30.5, plant: 13.6, Leipidoptera larva: 11.9, unidentified insect: 10.2, Homoptera/other: 8.5, Lepidoptera adult: 6.8, Isoptera: 6.8, Formicidae: 3.4 Diet based on fecal samples Percent occurrence in samples NR Not Reported 59 Kern River Preserve Exposure Factor Datasets Kern USA
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 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
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
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
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
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
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:

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 Units 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
Territory Size range of territory sizes during the breeding season m^2 Both Male and Female Adult 15 birds Sierra National Forest Exposure Factor Datasets Fresno
Hatching Success 75% hatching success among total eggs laid Both Male and Female Hatchling 8 nests 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:

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
Body Weight - Mean 13.07 mean body weight of traillii subspecies g Not Reported Adult 7 captures Rio Grand Nature Center (35deg07'N, 106deg41'W); Bosque del Apache National Wildlife Refuge (33deg48'N, 106deg52'W) Exposure Factor Datasets 0.84 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:

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:

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:

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:

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:

Time and energy budgets of the willow flycatcher (Empidonax traillii) during the breeding season

Author(s)
Ettinger, Amelia O. and James R. King
Pages
533-546
Year
Volume
97
Exposure Endpoint Type Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Condition
Metabolic Rate total daily energy expenditure kJ/h Male Adult 2-4 birds per breeding phase Hudson Biological Reserve Exposure Factor Datasets breeding
Metabolic Rate total daily energy expenditure kJ/d Female Adult 2-6 birds per breeding phase Hudson Biological Reserve Exposure Factor Datasets breeding

Southwestern Willow Flycatcher (Empidonax traillii ssp. extimus)

Citation:

Status and breeding ecology of the southwestern willow flycatcher in the Grand Canyon

Author(s)
Sogge, Mark K., Timothy J. Tibbitts, Jim R. Petterson
Pages
142-157
Year
Volume
28
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Error
Clutch or Litter Size 3 mean clutch size eggs/nest Female Adult 3 nests Colorado River Exposure Factor Datasets
Time of Mating/ Laying May 30 (onset) date when first eggs found Female Adult 17 nest attempts (in 5 sample years) Colorado River Exposure Factor Datasets
Time of Fledging or Metamorphosis June 29 (earliest fledging) - July 13 (latest fledging) dates of earlies and latest recording fledging Both Male and Female Fledgling 17 nest attempts (in 5 sample years) Colorado River Exposure Factor Datasets
Territory Size 0.10 breeding territory size ha Both Male and Female Adult 7 pairs Colorado River Exposure Factor Datasets 0.05 SD
Territory Size 0.5 territory size of unpaired male ha Male Adult 1 Colorado River Exposure Factor Datasets
Fledging or Weaning Rate 18% percent of nests that fledged at least one young % Both Male and Female Both Adults and Juveniles 17 nest attempts (in 5 sample years) Colorado River Exposure Factor Datasets
Citation:

A southwestern willow flycatcher natural history summary and survey protocol

Author(s)
Sogge, Mark K., Robert M. Marshall, Susan J. Sferra, and Timothy J. Tibbitts
Pages
42 pp
Publisher
U.S. Department of the Interior, National Park Service
Year
Exposure Endpoint Type Endpoint Value Sex Life Cycle Stage Sample Size Location Type
Time of Fledging or Metamorphosis review Not Reported Not Reported Not Reported Exposure Factor Datasets
Time of Hatching or Parturition review Not Reported Not Reported Not Reported Exposure Factor Datasets
Time of Mating/ Laying review Not Reported Not Reported Not Reported Exposure Factor Datasets
Time of Migration or Dispersal review Not Reported Not Reported Not Reported Exposure Factor Datasets
Time of Nesting review Not Reported Not Reported Not Reported Exposure Factor Datasets
Home Range review Not Reported Not Reported Not Reported Exposure Factor Datasets
Territory Size review Not Reported Not Reported Not Reported Exposure Factor Datasets
Clutch or Litter Size review Not Reported Not Reported Not Reported Exposure Factor Datasets
Duration of Incubation or Gestation review Not Reported Not Reported Not Reported Exposure Factor Datasets
Clutches or Litters per year review Not Reported Not Reported Not Reported Exposure Factor Datasets
Citation:

Breeding ecology of a willow flycatcher population in Grand Canyon, Arizona

Author(s)
Brown, Bryan T.
Pages
25-33
Year
Volume
19
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Population Density population density in a 360 km riparian corridor as indicated by song counts singing males/yr Male Adult 6 sampling yrs Colorado River, Grand Canyon National Park Exposure Factor Datasets
Population Density population density in a 360 km riparian corridor as indicated by active nest counts nests found/yr Both Male and Female Adult 6 sampling yrs Colorado River, Grand Canyon National Park 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 6 sampling yrs Colorado River, Grand Canyon National Park Exposure Factor Datasets
Citation:

Empidonax traillii extimus: An endangered subspecies

Author(s)
Unitt, Philip
Pages
137-162
Year
Volume
18
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location Type
Time of Nesting June 1 estimated beginning of nesting based on historic egg collections Both Male and Female Adult 187 dated egg sets coastal southern CA; Colorado River; upper San Pedro River, AZ Exposure Factor Datasets
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
Body Weight - Mean 12.73 mean body weight of extimus subspecies g Not Reported Adult 34 captures Rio Grand Nature Center (35deg07'N, 106deg41'W); Bosque del Apache National Wildlife Refuge (33deg48'N, 106deg52'W) Exposure Factor Datasets 1.16 SD

Northwestern willow flycatcher (Empidonax traillii ssp. brewsteri)

Citation:

Empidonax traillii extimus: An endangered subspecies

Author(s)
Unitt, Philip
Pages
137-162
Year
Volume
18
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location 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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