David Manuwal - Academia.edu (original) (raw)
Papers by David Manuwal
Food habits of the Common Barn-Owl in British Columbia
Canadian Journal of Zoology, 1987
The diet of the Common Barn-Owl, Tyto alba, in British Columbia was determined from analysis of 3... more The diet of the Common Barn-Owl, Tyto alba, in British Columbia was determined from analysis of 30 218 prey remains recovered from 11 787 pellets between 1941 and 1981. Small mammals were the main prey accounting for 98.0% of all remains, with rodents ( ...
Fifty-five bird species were observed during the sunmere of 1982 and 1985 using the upper subalpi... more Fifty-five bird species were observed during the sunmere of 1982 and 1985 using the upper subalpine habitat on three Cascade voicanoes. The regetation differed sonewhat among the studY areas, although subalpine fn @6;es lasiocarpa) was the dominant tr€e al all sites. Bird sp€cies richness sas highest al Mount Adams and Pine Creel on Mount St. Helens, and lowesr al Burie Camp on Nlount Sr. Helens. Bird abundance was highest at Butte Canp {here lhere {ere large nunbere ofpine siskins. Several species exhibited wide variation in abundanc€ among srudy areas. Approiinal€l) 18 species nested al each slud) area, bur there was variarion in species conposirion. Differences in abundance and species composition were partly atlribulable lo vegelation featur€! of the study areas. Birds fe€ding on insecrs on or near the ground, and coniief seed-eaters were numericalh doninani. Tbere appeared to be no longterm inpact of the 1980 eluption of Mount St. Helens on the subalpine avifaunas ex.ept at Pine
Colonial Nesting Sea and Wading Bird Use of Estuarine Islands in the Pacific Northwest
Abstract: Twenty-three natural and dredged material islands were examined in seven locations from... more Abstract: Twenty-three natural and dredged material islands were examined in seven locations from Anacortes, Washington, to Coos Bay, Oregon, to establish the relationships between plant communities and use by colonial nesting waterbirds for both types of ...
Influence of Niche Overlap and Territoriality on Hybridization Between Hermit Warblers and Townsend's Warblers
The Auk, 2000
The Condor, May 1, 1986
During 1914 through 1983, we investigated the breeding biology of the Rhinoceros Auklet (Cerorhin... more During 1914 through 1983, we investigated the breeding biology of the Rhinoceros Auklet (Cerorhinca monocerata) at three main colony sites on the coast of Washington: Destruction Island (offshore) and Protection and Smith islands (inland islands of the Strait of Juan de Fuca).
Marine bird populations of the Strait of Juan de Fuca, Strait of Georgia and adjacent waters in 1978 and 1979
Description/Abstract The threat of oil pollution in the Strait of Juan de Fuca has prompted this ... more Description/Abstract The threat of oil pollution in the Strait of Juan de Fuca has prompted this study of marine birds in Washington State. The study was conducted from 1 January 1978 to 31 December 1979 in the Strait of Juan de Fuca north to the San Juan Islands and Point ...
We studied productivity of great blue herons (Ardea herodias) at their nesting colonies in King C... more We studied productivity of great blue herons (Ardea herodias) at their nesting colonies in King County, western Washington in the 2000 breeding season. Rapid urbanization has been hypothesized to have limited heron population growth in recent years. Of the 354 active nests in 2000, 260 (74%) nests produced fledglings. Mean productivity for all active nests was 1.77 (SD = 1.37). Mean productivity for the 260 successful nests was 2.42 (SD = 1.01). Calculations of productivity for the active and successful nests are similar to or greater than results of 8 of 10 similar calculations from studies conducted in the Pacific Northwest, and one study that used band return data to determine the minimum productivity required to maintain a stable population. Herons that began incubating earlier in the season (prior to 17 April) had higher productivity than those that began nesting later in the season (P < 0.001).
Fifty-five bird species were observed during the sunmere of 1982 and 1985 using the upper subalpi... more Fifty-five bird species were observed during the sunmere of 1982 and 1985 using the upper subalpine habitat on three Cascade voicanoes. The regetation differed sonewhat among the studY areas, although subalpine fn @6;es lasiocarpa) was the dominant tr€e al all sites. Bird sp€cies richness sas highest al Mount Adams and Pine Creel on Mount St. Helens, and lowesr al Burie Camp on Nlount Sr. Helens. Bird abundance was highest at Butte Canp {here lhere {ere large nunbere ofpine siskins. Several species exhibited wide variation in abundanc€ among srudy areas. Approiinal€l) 18 species nested al each slud) area, bur there was variarion in species conposirion. Differences in abundance and species composition were partly atlribulable lo vegelation featur€! of the study areas. Birds fe€ding on insecrs on or near the ground, and coniief seed-eaters were numericalh doninani. Tbere appeared to be no longterm inpact of the 1980 eluption of Mount St. Helens on the subalpine avifaunas ex.ept at Pin...
We are not aware of any published accounts of the behavior of the Parakeet Auklet (C'•,ciorrfi•,r... more We are not aware of any published accounts of the behavior of the Parakeet Auklet (C'•,ciorrfi•,r•½fi us psittacula). Previous studies of this species have centered on its ecology in the Bering Sea (B•dard 1969a, 1969b, Sealy 1968, Sealy and B•dard 1973). Our intent is to discuss and relate the basic behavior patterns of this species to the reproductive cycle and components of the nesting environment.
Cassin's Auklet (Ptychoramphus aleuticus)
The Birds of North America Online, 1993
The Birds of the Fraser River Delta: Populations, Ecology and International Significance
The Murrelet, 1988
The Fraser River delta is the largest estuary on the Pacific coast of Canada. In concert with the... more The Fraser River delta is the largest estuary on the Pacific coast of Canada. In concert with the Copper River delta in Alaska and the wetlands of California, the Fraser River delta is a link in a chain of vital bird habitats between breeding grounds in Canada, Alaska and the ...
Progressive Territory Establishment of Four Species of Neotropical Migrants in Linear Riparian Areas in Western Montana
Northwest Science, 2014
ABSTRACT We documented settling patterns for territorial males of four species of Neotropical bir... more ABSTRACT We documented settling patterns for territorial males of four species of Neotropical bird species in three riparian study areas in western Montana in 1968, 1980 and 2008. The species were Hammond's Flycatcher (Empidonax hammondii), Warbling Vireo (Vireo gilvus), American Redstart (Setophaga ruticilla), and MacGillivray's Warbler (Geothlypis tolmiei). Early arriving males selected areas with some different vegetation attributes than later-arriving males. The most important vegetation variables in early territories were riparian width, red-osier dogwood (Cornus stolonifera) canopy cover, and red-osier dogwood height. Habitat in territories had some vegetation attributes different than unoccupied areas. Unoccupied habitat had narrower riparian width, taller conifer canopy cover, and shorter dogwood canopy cover.
The Murrelet, 1975
JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, a... more JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.
Spring and Winter Bird Populations in a Douglas-Fir Forest Sere
The Journal of Wildlife Management, 1987
... DAVID A. MANUWAL, Wildlife Science Group, College of Forest Resources, University of Washingt... more ... DAVID A. MANUWAL, Wildlife Science Group, College of Forest Resources, University of Washington, Seattle, WA 98195 MARK H. HUFF, Wildlife Science Group, College of Forest Resources, University of Washington, Seattle, WA 98195 ...
Ecological Applications, 2001
We examined the relative importance of riparian vs. upland habitats to breeding birds by comparin... more We examined the relative importance of riparian vs. upland habitats to breeding birds by comparing species abundance, richness, and similarity of bird communities in managed Douglas-fir forests in western Washington State, USA. We also examined whether forested buffer strips along second-and third-order streams effectively maintain the pre-logging riparian breeding bird community by comparing species abundance, richness, and turnover among three treatments: (1) unharvested controls; (2) sites that were clear-cut, leaving a narrow (ϳ14 m) forested buffer on both sides of the stream; and (3) sites that were clear-cut, leaving a wide (ϳ31 m) forested buffer along both sides of the stream.
The Condor, 1986
During 1914 through 1983, we investigated the breeding biology of the Rhinoceros Auklet (Cerorhin... more During 1914 through 1983, we investigated the breeding biology of the Rhinoceros Auklet (Cerorhinca monocerata) at three main colony sites on the coast of Washington: Destruction Island (offshore) and Protection and Smith islands (inland islands of the Strait of Juan de Fuca).
Food habits of the Common Barn-Owl in British Columbia
Canadian Journal of Zoology, 1987
The diet of the Common Barn-Owl, Tyto alba, in British Columbia was determined from analysis of 3... more The diet of the Common Barn-Owl, Tyto alba, in British Columbia was determined from analysis of 30 218 prey remains recovered from 11 787 pellets between 1941 and 1981. Small mammals were the main prey accounting for 98.0% of all remains, with rodents ( ...
The Auk, 1972
Lichtenau of two species previously unreported from Paraguay. A female Black-billed Cuckoo (Coccy... more Lichtenau of two species previously unreported from Paraguay. A female Black-billed Cuckoo (Coccyzus erythropthaImus, AMNH No. 802,827) collected 11 December 1970 is the first record of that species from Paraguay, and only the second record south of northern Peru (Meyer de Schauensee, Birds of South America, Wynnewood, Pennsylvania, Livingston Publ. Co., 1966, p. 137). A previous record from Misiones, Argentina, cited by Meyer de Schauensee, was considered by him to represent an accidental occurrence. It may prove casual, or even regular, rather than accidental in central South America.
Food habits of the Common Barn-Owl in British Columbia
Canadian Journal of Zoology, 1987
The diet of the Common Barn-Owl, Tyto alba, in British Columbia was determined from analysis of 3... more The diet of the Common Barn-Owl, Tyto alba, in British Columbia was determined from analysis of 30 218 prey remains recovered from 11 787 pellets between 1941 and 1981. Small mammals were the main prey accounting for 98.0% of all remains, with rodents ( ...
Fifty-five bird species were observed during the sunmere of 1982 and 1985 using the upper subalpi... more Fifty-five bird species were observed during the sunmere of 1982 and 1985 using the upper subalpine habitat on three Cascade voicanoes. The regetation differed sonewhat among the studY areas, although subalpine fn @6;es lasiocarpa) was the dominant tr€e al all sites. Bird sp€cies richness sas highest al Mount Adams and Pine Creel on Mount St. Helens, and lowesr al Burie Camp on Nlount Sr. Helens. Bird abundance was highest at Butte Canp {here lhere {ere large nunbere ofpine siskins. Several species exhibited wide variation in abundanc€ among srudy areas. Approiinal€l) 18 species nested al each slud) area, bur there was variarion in species conposirion. Differences in abundance and species composition were partly atlribulable lo vegelation featur€! of the study areas. Birds fe€ding on insecrs on or near the ground, and coniief seed-eaters were numericalh doninani. Tbere appeared to be no longterm inpact of the 1980 eluption of Mount St. Helens on the subalpine avifaunas ex.ept at Pine
Colonial Nesting Sea and Wading Bird Use of Estuarine Islands in the Pacific Northwest
Abstract: Twenty-three natural and dredged material islands were examined in seven locations from... more Abstract: Twenty-three natural and dredged material islands were examined in seven locations from Anacortes, Washington, to Coos Bay, Oregon, to establish the relationships between plant communities and use by colonial nesting waterbirds for both types of ...
Influence of Niche Overlap and Territoriality on Hybridization Between Hermit Warblers and Townsend's Warblers
The Auk, 2000
The Condor, May 1, 1986
During 1914 through 1983, we investigated the breeding biology of the Rhinoceros Auklet (Cerorhin... more During 1914 through 1983, we investigated the breeding biology of the Rhinoceros Auklet (Cerorhinca monocerata) at three main colony sites on the coast of Washington: Destruction Island (offshore) and Protection and Smith islands (inland islands of the Strait of Juan de Fuca).
Marine bird populations of the Strait of Juan de Fuca, Strait of Georgia and adjacent waters in 1978 and 1979
Description/Abstract The threat of oil pollution in the Strait of Juan de Fuca has prompted this ... more Description/Abstract The threat of oil pollution in the Strait of Juan de Fuca has prompted this study of marine birds in Washington State. The study was conducted from 1 January 1978 to 31 December 1979 in the Strait of Juan de Fuca north to the San Juan Islands and Point ...
We studied productivity of great blue herons (Ardea herodias) at their nesting colonies in King C... more We studied productivity of great blue herons (Ardea herodias) at their nesting colonies in King County, western Washington in the 2000 breeding season. Rapid urbanization has been hypothesized to have limited heron population growth in recent years. Of the 354 active nests in 2000, 260 (74%) nests produced fledglings. Mean productivity for all active nests was 1.77 (SD = 1.37). Mean productivity for the 260 successful nests was 2.42 (SD = 1.01). Calculations of productivity for the active and successful nests are similar to or greater than results of 8 of 10 similar calculations from studies conducted in the Pacific Northwest, and one study that used band return data to determine the minimum productivity required to maintain a stable population. Herons that began incubating earlier in the season (prior to 17 April) had higher productivity than those that began nesting later in the season (P < 0.001).
Fifty-five bird species were observed during the sunmere of 1982 and 1985 using the upper subalpi... more Fifty-five bird species were observed during the sunmere of 1982 and 1985 using the upper subalpine habitat on three Cascade voicanoes. The regetation differed sonewhat among the studY areas, although subalpine fn @6;es lasiocarpa) was the dominant tr€e al all sites. Bird sp€cies richness sas highest al Mount Adams and Pine Creel on Mount St. Helens, and lowesr al Burie Camp on Nlount Sr. Helens. Bird abundance was highest at Butte Canp {here lhere {ere large nunbere ofpine siskins. Several species exhibited wide variation in abundanc€ among srudy areas. Approiinal€l) 18 species nested al each slud) area, bur there was variarion in species conposirion. Differences in abundance and species composition were partly atlribulable lo vegelation featur€! of the study areas. Birds fe€ding on insecrs on or near the ground, and coniief seed-eaters were numericalh doninani. Tbere appeared to be no longterm inpact of the 1980 eluption of Mount St. Helens on the subalpine avifaunas ex.ept at Pin...
We are not aware of any published accounts of the behavior of the Parakeet Auklet (C'•,ciorrfi•,r... more We are not aware of any published accounts of the behavior of the Parakeet Auklet (C'•,ciorrfi•,r•½fi us psittacula). Previous studies of this species have centered on its ecology in the Bering Sea (B•dard 1969a, 1969b, Sealy 1968, Sealy and B•dard 1973). Our intent is to discuss and relate the basic behavior patterns of this species to the reproductive cycle and components of the nesting environment.
Cassin's Auklet (Ptychoramphus aleuticus)
The Birds of North America Online, 1993
The Birds of the Fraser River Delta: Populations, Ecology and International Significance
The Murrelet, 1988
The Fraser River delta is the largest estuary on the Pacific coast of Canada. In concert with the... more The Fraser River delta is the largest estuary on the Pacific coast of Canada. In concert with the Copper River delta in Alaska and the wetlands of California, the Fraser River delta is a link in a chain of vital bird habitats between breeding grounds in Canada, Alaska and the ...
Progressive Territory Establishment of Four Species of Neotropical Migrants in Linear Riparian Areas in Western Montana
Northwest Science, 2014
ABSTRACT We documented settling patterns for territorial males of four species of Neotropical bir... more ABSTRACT We documented settling patterns for territorial males of four species of Neotropical bird species in three riparian study areas in western Montana in 1968, 1980 and 2008. The species were Hammond's Flycatcher (Empidonax hammondii), Warbling Vireo (Vireo gilvus), American Redstart (Setophaga ruticilla), and MacGillivray's Warbler (Geothlypis tolmiei). Early arriving males selected areas with some different vegetation attributes than later-arriving males. The most important vegetation variables in early territories were riparian width, red-osier dogwood (Cornus stolonifera) canopy cover, and red-osier dogwood height. Habitat in territories had some vegetation attributes different than unoccupied areas. Unoccupied habitat had narrower riparian width, taller conifer canopy cover, and shorter dogwood canopy cover.
The Murrelet, 1975
JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, a... more JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.
Spring and Winter Bird Populations in a Douglas-Fir Forest Sere
The Journal of Wildlife Management, 1987
... DAVID A. MANUWAL, Wildlife Science Group, College of Forest Resources, University of Washingt... more ... DAVID A. MANUWAL, Wildlife Science Group, College of Forest Resources, University of Washington, Seattle, WA 98195 MARK H. HUFF, Wildlife Science Group, College of Forest Resources, University of Washington, Seattle, WA 98195 ...
Ecological Applications, 2001
We examined the relative importance of riparian vs. upland habitats to breeding birds by comparin... more We examined the relative importance of riparian vs. upland habitats to breeding birds by comparing species abundance, richness, and similarity of bird communities in managed Douglas-fir forests in western Washington State, USA. We also examined whether forested buffer strips along second-and third-order streams effectively maintain the pre-logging riparian breeding bird community by comparing species abundance, richness, and turnover among three treatments: (1) unharvested controls; (2) sites that were clear-cut, leaving a narrow (ϳ14 m) forested buffer on both sides of the stream; and (3) sites that were clear-cut, leaving a wide (ϳ31 m) forested buffer along both sides of the stream.
The Condor, 1986
During 1914 through 1983, we investigated the breeding biology of the Rhinoceros Auklet (Cerorhin... more During 1914 through 1983, we investigated the breeding biology of the Rhinoceros Auklet (Cerorhinca monocerata) at three main colony sites on the coast of Washington: Destruction Island (offshore) and Protection and Smith islands (inland islands of the Strait of Juan de Fuca).
Food habits of the Common Barn-Owl in British Columbia
Canadian Journal of Zoology, 1987
The diet of the Common Barn-Owl, Tyto alba, in British Columbia was determined from analysis of 3... more The diet of the Common Barn-Owl, Tyto alba, in British Columbia was determined from analysis of 30 218 prey remains recovered from 11 787 pellets between 1941 and 1981. Small mammals were the main prey accounting for 98.0% of all remains, with rodents ( ...
The Auk, 1972
Lichtenau of two species previously unreported from Paraguay. A female Black-billed Cuckoo (Coccy... more Lichtenau of two species previously unreported from Paraguay. A female Black-billed Cuckoo (Coccyzus erythropthaImus, AMNH No. 802,827) collected 11 December 1970 is the first record of that species from Paraguay, and only the second record south of northern Peru (Meyer de Schauensee, Birds of South America, Wynnewood, Pennsylvania, Livingston Publ. Co., 1966, p. 137). A previous record from Misiones, Argentina, cited by Meyer de Schauensee, was considered by him to represent an accidental occurrence. It may prove casual, or even regular, rather than accidental in central South America.