Mallard drakes (Anas platyrhynchos) fed 1, 5, or 25 ppm lead nitrate were bled and sacrificed at 3‐wk intervals. No mortality occurred, and the pathologic lesions usually associated with lead poisoning were not found. Changes in hematocrit and hemoglobin concentration did not occur. After 3 wk ducks fed 25 ppm lead exhibited a 40% inhibition of blood δ‐aminolevulinic acid dehydratase activity that persisted through 12 wk exposure. After 12 wk treatment similar enzyme inhibition was present in the ducks fed 5 ppm lead. At 3 wk there was a small accumulation of lead (less than 1 ppm) in the liver and kidneys of ducks fed 25 ppm lead; no further increases occurred throughout the exposure. No significant accumulation of lead occurred in the tibiae or wing bones. Groups of ducks fed 5 and 25 ppm diets for 12 wk were placed on clean feed and examined through a 12 wk posttreatment period. After 3 wk on clean diet δ‐aminolevulinic acid dehydratase activity and lead concentrations in the blood had returned to pretreatment levels. Even though lead concentrations in the blood, soft organs, and bone were low, a highly significant negative correlation between blood lead and blood enzyme activity was obtained. This enzyme bioassay should provide a sensitive and precise estimate for monitoring lead in the blood for waterfowl.
No abstract available.
","language":"English","publisher":"De Gruyter","doi":"10.1515/mamm.1976.40.3.429","usgsCitation":"Estes, J.A., and Buss, I., 1976, Microanatomical development and structure of the African elephant's temporal gland: Mammalia, v. 40, no. 3, p. 429-436, https://doi.org/10.1515/mamm.1976.40.3.429.","productDescription":"8 p.","startPage":"429","endPage":"436","costCenters":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"links":[{"id":129766,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"40","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a56e4b07f02db62de14","contributors":{"authors":[{"text":"Estes, J. A.","contributorId":53319,"corporation":false,"usgs":true,"family":"Estes","given":"J.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":316006,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Buss, I.O.","contributorId":83873,"corporation":false,"usgs":true,"family":"Buss","given":"I.O.","email":"","affiliations":[],"preferred":false,"id":316007,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":5230237,"text":"5230237 - 1976 - Wildlife importation into the United States, 1900-1972","interactions":[],"lastModifiedDate":"2012-02-02T00:15:25","indexId":"5230237","displayToPublicDate":"2009-06-09T12:33:00","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":1,"text":"Federal Government Series"},"seriesTitle":{"id":83,"text":"Special Scientific Report - Wildlife","active":false,"publicationSubtype":{"id":1}},"seriesNumber":"200","title":"Wildlife importation into the United States, 1900-1972","docAbstract":"Data from Bureau of Biological Survey and U.S. Fish and Wildlife Service reports show an overall increase in the number of birds and mammals imported from 1900 to 1972. The trend was interrupted by World War I, the economic depression of the 1930's, and World War II. Data are lacking for the years after World War II until 1968. Until 1942, domesticated canaries and a few species of game birds made up most of the avian imports; the shell parakeet or budgerigar was the most commonly imported parrot. Although the total number ofbirds imported 1968-72 was-not greatly different from the pre-depression years, the proportion of canaries, game species, and parakeets declined greatly and the variety and number of cage birds including other parrot species greatly increased. Until 1930 most mammals imported were for laboratory use or fur farming. After 1930 the number of imported mammals increased with the growing importance of primates, especially rhesus macaques, in research. Since 1968 the number of mammals irnported annually has been at least 5 times greater than the previous peak of 1938, and primates have made up 87% of mammalian imports. Information on reptiles and amphibians imported into the United States is available only for 1970 and 1971. Turtles were the most commonly imported reptiles, frogs and toads the most commonly imported amphibians.","language":"English","publisher":"U.S. Fish and Wildlife Service","usgsCitation":"Banks, R., 1976, Wildlife importation into the United States, 1900-1972: Special Scientific Report - Wildlife 200, 18.","productDescription":"18","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":202744,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":91960,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://hdl.handle.net/2027/mdp.39015077575069","linkFileType":{"id":5,"text":"html"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e49f4e4b07f02db5f01aa","contributors":{"authors":[{"text":"Banks, R.C.","contributorId":20440,"corporation":false,"usgs":true,"family":"Banks","given":"R.C.","affiliations":[],"preferred":false,"id":343805,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":5230124,"text":"5230124 - 1976 - The Literature of the Western Clapper Rails","interactions":[],"lastModifiedDate":"2012-02-02T00:15:26","indexId":"5230124","displayToPublicDate":"2009-06-09T12:33:00","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":1,"text":"Federal Government Series"},"seriesTitle":{"id":83,"text":"Special Scientific Report - Wildlife","active":false,"publicationSubtype":{"id":1}},"seriesNumber":"194","title":"The Literature of the Western Clapper Rails","language":"English","publisher":"U.S. Fish and Wildlife Service","collaboration":"1878_Wilbur.pdf","usgsCitation":"Wilbur, S., and Tomlinson, R.E., 1976, The Literature of the Western Clapper Rails: Special Scientific Report - Wildlife 194, iii, 31.","productDescription":"iii, 31","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":91959,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://hdl.handle.net/2027/mdp.39015077574930","linkFileType":{"id":5,"text":"html"}},{"id":202814,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ac8e4b07f02db67bbd4","contributors":{"authors":[{"text":"Wilbur, S.R.","contributorId":53908,"corporation":false,"usgs":true,"family":"Wilbur","given":"S.R.","email":"","affiliations":[],"preferred":false,"id":343554,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Tomlinson, R. E.","contributorId":78830,"corporation":false,"usgs":true,"family":"Tomlinson","given":"R.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":343555,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":5200196,"text":"5200196 - 1976 - The distributional status of some Peruvian mammals","interactions":[],"lastModifiedDate":"2012-02-02T00:15:23","indexId":"5200196","displayToPublicDate":"2009-06-09T09:33:22","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":3,"text":"Organization Series"},"seriesTitle":{"id":199,"text":"Occasional papers of the Museum of Zoology","active":false,"publicationSubtype":{"id":3}},"seriesNumber":"No. 48.","title":"The distributional status of some Peruvian mammals","language":"English","publisher":"Louisiana State University","publisherLocation":"Baton Rouge, La","usgsCitation":"Gardner, A.L., 1976, The distributional status of some Peruvian mammals: Occasional papers of the Museum of Zoology No. 48., 18.","productDescription":"18","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":202715,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4aa9e4b07f02db668294","contributors":{"authors":[{"text":"Gardner, A. L.","contributorId":97213,"corporation":false,"usgs":true,"family":"Gardner","given":"A.","middleInitial":"L.","affiliations":[],"preferred":false,"id":327187,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":5200197,"text":"5200197 - 1976 - Karyotypic variation in oryzomyine rodents (Cricetinae) with comments on chromosomal evolution in the neotropical cricetine complex","interactions":[],"lastModifiedDate":"2012-02-02T00:15:23","indexId":"5200197","displayToPublicDate":"2009-06-09T09:33:22","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":3,"text":"Organization Series"},"seriesTitle":{"id":199,"text":"Occasional papers of the Museum of Zoology","active":false,"publicationSubtype":{"id":3}},"seriesNumber":"No. 49.","title":"Karyotypic variation in oryzomyine rodents (Cricetinae) with comments on chromosomal evolution in the neotropical cricetine complex","language":"English","publisher":"Louisiana State University","publisherLocation":"Baton Rouge, La","usgsCitation":"Gardner, A.L., and Patton, J., 1976, Karyotypic variation in oryzomyine rodents (Cricetinae) with comments on chromosomal evolution in the neotropical cricetine complex: Occasional papers of the Museum of Zoology No. 49., 48.","productDescription":"48","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":202716,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b32e4b07f02db6b4834","contributors":{"authors":[{"text":"Gardner, A. L.","contributorId":97213,"corporation":false,"usgs":true,"family":"Gardner","given":"A.","middleInitial":"L.","affiliations":[],"preferred":false,"id":327189,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Patton, J.L.","contributorId":43885,"corporation":false,"usgs":true,"family":"Patton","given":"J.L.","email":"","affiliations":[],"preferred":false,"id":327188,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":5200112,"text":"5200112 - 1976 - Newsletter for the Accelerated Research Program for migratory shore and upland game birds","interactions":[],"lastModifiedDate":"2012-02-02T00:15:25","indexId":"5200112","displayToPublicDate":"2009-06-09T09:33:22","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":3,"text":"Organization Series"},"seriesTitle":{"id":193,"text":"Newsletter for the Accelerated Research Program for migratory shore and upland game birds","active":false,"publicationSubtype":{"id":3}},"seriesNumber":"[No. 1].","title":"Newsletter for the Accelerated Research Program for migratory shore and upland game birds","language":"English","publisher":"U.S. Fish and Wildlife Service, Migratory Bird & Habitat Research Laboratory","publisherLocation":"Laurel, MD","usgsCitation":"Coon, R., 1976, Newsletter for the Accelerated Research Program for migratory shore and upland game birds: Newsletter for the Accelerated Research Program for migratory shore and upland game birds [No. 1]., 45.","productDescription":"45","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":202668,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b1be4b07f02db6a91b8","contributors":{"authors":[{"text":"Coon, R.A.","contributorId":43060,"corporation":false,"usgs":true,"family":"Coon","given":"R.A.","email":"","affiliations":[],"preferred":false,"id":327017,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":5230212,"text":"5230212 - 1976 - Methods for locating, trapping and banding band-tailed pigeons in Colorado","interactions":[],"lastModifiedDate":"2012-02-02T00:15:25","indexId":"5230212","displayToPublicDate":"2009-06-09T09:33:22","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":3,"text":"Organization Series"},"seriesTitle":{"id":166,"text":"Colorado Division of Wildlife, Special Report","active":false,"publicationSubtype":{"id":3}},"seriesNumber":"No. 39","title":"Methods for locating, trapping and banding band-tailed pigeons in Colorado","language":"English","collaboration":"State Publication Code W-R-5-39-76 OCLC: 2944072","usgsCitation":"Braun, C., 1976, Methods for locating, trapping and banding band-tailed pigeons in Colorado: Colorado Division of Wildlife, Special Report No. 39, 20.","productDescription":"20","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":202666,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a53e4b07f02db62b979","contributors":{"authors":[{"text":"Braun, C.E.","contributorId":57421,"corporation":false,"usgs":true,"family":"Braun","given":"C.E.","email":"","affiliations":[],"preferred":false,"id":343743,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":5200028,"text":"5200028 - 1976 - American woodcock in West Virginia","interactions":[],"lastModifiedDate":"2012-02-02T00:15:23","indexId":"5200028","displayToPublicDate":"2009-06-09T09:33:21","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":3,"text":"Organization Series"},"seriesTitle":{"id":162,"text":"Bulletin","active":false,"publicationSubtype":{"id":3}},"seriesNumber":"No. 8.","title":"American woodcock in West Virginia","language":"English","publisher":"West Virginia Department of Natural Resources","publisherLocation":"Charleston","collaboration":"OCLC: 6479691. 'Pittman-Robertson Project W-37-R and Accelerated Research Program for Migratory Shore and Upland Game Birds.'","usgsCitation":"Kletzly, R., 1976, American woodcock in West Virginia: Bulletin No. 8., 46.","productDescription":"46","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":202781,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4adce4b07f02db6868c6","contributors":{"authors":[{"text":"Kletzly, R.C.","contributorId":23666,"corporation":false,"usgs":true,"family":"Kletzly","given":"R.C.","email":"","affiliations":[],"preferred":false,"id":326840,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":5200035,"text":"5200035 - 1976 - Sexual Size Dimorphism in Hawks and Owls of North America","interactions":[],"lastModifiedDate":"2012-02-02T00:15:23","indexId":"5200035","displayToPublicDate":"2009-06-09T09:33:21","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":3,"text":"Organization Series"},"seriesTitle":{"id":203,"text":"Ornithological Monographs","active":false,"publicationSubtype":{"id":3}},"seriesNumber":"No. 20.","title":"Sexual Size Dimorphism in Hawks and Owls of North America","language":"English","usgsCitation":"Snyder, N., and Wiley, J.W., 1976, Sexual Size Dimorphism in Hawks and Owls of North America: Ornithological Monographs No. 20., xvi, 96.","productDescription":"xvi, 96","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":202718,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b05e4b07f02db699f37","contributors":{"authors":[{"text":"Snyder, N.F.R.","contributorId":59383,"corporation":false,"usgs":true,"family":"Snyder","given":"N.F.R.","email":"","affiliations":[],"preferred":false,"id":326858,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wiley, J. W.","contributorId":51399,"corporation":false,"usgs":false,"family":"Wiley","given":"J.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":326857,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":5211443,"text":"5211443 - 1976 - Trumpeter swan, Cygnus buccinator Richardson","interactions":[],"lastModifiedDate":"2012-02-02T00:15:27","indexId":"5211443","displayToPublicDate":"2009-06-09T09:23:20","publicationYear":"1976","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"title":"Trumpeter swan, Cygnus buccinator Richardson","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Handbook of North American Birds 2: Waterfowl, Part 1","largerWorkSubtype":{"id":4,"text":"Other Government Series"},"language":"English","publisher":"Yale University Press","publisherLocation":"New Haven, Connecticut","usgsCitation":"Banko, W., and Schorger, A., 1976, Trumpeter swan, Cygnus buccinator Richardson, chap. of Handbook of North American Birds 2: Waterfowl, Part 1, p. 55-71.","productDescription":"xi, 521","startPage":"55","endPage":"71","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":202947,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a49e4b07f02db624321","contributors":{"editors":[{"text":"Palmer, Ralph S.","contributorId":111637,"corporation":false,"usgs":true,"family":"Palmer","given":"Ralph","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":508130,"contributorType":{"id":2,"text":"Editors"},"rank":1}],"authors":[{"text":"Banko, W.E.","contributorId":62694,"corporation":false,"usgs":true,"family":"Banko","given":"W.E.","email":"","affiliations":[],"preferred":false,"id":331073,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Schorger, A.W.","contributorId":58747,"corporation":false,"usgs":true,"family":"Schorger","given":"A.W.","email":"","affiliations":[],"preferred":false,"id":331072,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":5211395,"text":"5211395 - 1976 - Preliminary assessment of aerial photography techniques for canvasback population analysis","interactions":[],"lastModifiedDate":"2012-02-02T00:15:22","indexId":"5211395","displayToPublicDate":"2009-06-09T09:23:20","publicationYear":"1976","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"title":"Preliminary assessment of aerial photography techniques for canvasback population analysis","docAbstract":"Recent intensive research on the canvasback has focused attention on the need for more precise estimates of population parameters. During the 1972-75 period, various types of aerial photographing equipment were evaluated to determine the problems and potentials for employing these techniques in appraisals of canvasback populations. The equipment and procedures available for automated analysis of aerial photographic imagery were also investigated. Serious technical problems remain to be resolved, but some promising results were obtained. Final conclusions about the feasibility of operational implementation await a more rigorous analysis of the data collected.","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Transactions of the Canvasback Workshop : April 6-7, 1976, Ramada Inn, Jamestown, North Dakota","largerWorkSubtype":{"id":4,"text":"Other Government Series"},"language":"English","publisher":"North Dakota Game and Fish Department","publisherLocation":"Bismark","collaboration":"Hosted by North Dakota Game and Fish Department and the Northern Prairie Wildlife Research Center, U.S. Fish and Wildlife Service. Sponsors, Central Mountains and Plains Section and North Dakota Chapter of the Wildlife Society.","usgsCitation":"Munro, R.E., and Trauger, D., 1976, Preliminary assessment of aerial photography techniques for canvasback population analysis, chap. of Transactions of the Canvasback Workshop : April 6-7, 1976, Ramada Inn, Jamestown, North Dakota, p. 7-10.","productDescription":"v, 63","startPage":"7","endPage":"10","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":200604,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ac9e4b07f02db67ca5d","contributors":{"authors":[{"text":"Munro, R. E.","contributorId":75656,"corporation":false,"usgs":true,"family":"Munro","given":"R.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":330942,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Trauger, D.L.","contributorId":69091,"corporation":false,"usgs":true,"family":"Trauger","given":"D.L.","email":"","affiliations":[],"preferred":false,"id":330941,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":5211396,"text":"5211396 - 1976 - Comments on recent canvasback habitat trends and threats on Chesapeake Bay","interactions":[],"lastModifiedDate":"2012-02-02T00:15:26","indexId":"5211396","displayToPublicDate":"2009-06-09T09:23:20","publicationYear":"1976","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"title":"Comments on recent canvasback habitat trends and threats on Chesapeake Bay","docAbstract":"During the last 22 years, the North American winter population of canvasbacks has fluctuated from 481,000 in 1955 to 179,000 in 1972. The Chesapeake Bay population has averaged 33 percent of the North American population and 64 percent of the Atlantic Flyway population. In Maryland, significant annual fluctuations have been recorded between the eastern and western shore of Chesapeake Bay. In 1968, 11 percent of the Bay canvasbacks were on the western shore, whereas in 1971, 87 percent of the birds wintered in this area. This increase in 1971 is believed to be in response to large populations of small Rangia cuneata clams. I n recent years, mortality of small clams and reduced spawning have resulted in a larger size class for Rangia making them less desirable as a waterfowl food. Canvasback populations in 1975 and 1976 were more dispersed in Chesapeake Bay when the predominant food of canvasbacks was Macoma balthica. In the last 5 years, the number of canvasbacks wintering in Chesapeake Bay has declined slightly, while the North American and Atlantic Flyway populations have increased. Increases have been noted in New Jersey and North Carolina. This trend may indicate that the quality of canvasback habitat in Chesapeake Bay is declining at a faster rate than other areas along the Atlantic coast.","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Transactions of the Canvasback Workshop : April 6-7, 1976, Ramada Inn, Jamestown, North Dakota","largerWorkSubtype":{"id":4,"text":"Other Government Series"},"language":"English","publisher":"North Dakota Game and Fish Department","publisherLocation":"Bismark","collaboration":"Hosted by North Dakota Game and Fish Department and the Northern Prairie Wildlife Research Center, U.S. Fish and Wildlife Service. Sponsors, Central Mountains and Plains Section and North Dakota Chapter of the Wildlife Society.","usgsCitation":"Perry, M., 1976, Comments on recent canvasback habitat trends and threats on Chesapeake Bay, chap. of Transactions of the Canvasback Workshop : April 6-7, 1976, Ramada Inn, Jamestown, North Dakota.","productDescription":"v, 63","startPage":"17 (abs)","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":203027,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b24e4b07f02db6ae6a6","contributors":{"authors":[{"text":"Perry, Matthew C. 0000-0001-6452-9534","orcid":"https://orcid.org/0000-0001-6452-9534","contributorId":16372,"corporation":false,"usgs":true,"family":"Perry","given":"Matthew C.","affiliations":[],"preferred":false,"id":330943,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":5211398,"text":"5211398 - 1976 - Incidence of lead shot in canvasbacks","interactions":[],"lastModifiedDate":"2012-02-02T00:15:26","indexId":"5211398","displayToPublicDate":"2009-06-09T09:23:20","publicationYear":"1976","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"title":"Incidence of lead shot in canvasbacks","docAbstract":"During 1975 and 1976, 2,544 canvasbacks (Aythya valisineria) from North Dakota, Wisconsin, Illinois, and Maryland were flouroscoped to determine the incidence of body shot. A significant increase from west to east was detected in the incidence of shot for immatures from the four states. The incidence of shot in immatures after the 1975-76 hunting season was 18 percent in Maryland and 20 percent in Illinois. In Wisconsin no difference in the incidence of shot could be detected between areas trapped or time periods when trapping was conducted. In Maryland a significant decrease in the incidence of body shot was detected in adults, but not immatures, between 1975 and 1976. shot was located throughout the body of canvasbacks. Frequency varied from one to nine shot per bird and averaged 2.0 for adults and 1.5 for immatures.","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Transactions of the Canvasback Workshop : April 6-7, 1976, Ramada Inn, Jamestown, North Dakota","largerWorkSubtype":{"id":4,"text":"Other Government Series"},"language":"English","publisher":"North Dakota Game and Fish Department","publisherLocation":"Bismark","collaboration":"Hosted by North Dakota Game and Fish Department and the Northern Prairie Wildlife Research Center, U.S. Fish and Wildlife Service. 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