Regional differences and long-term trends in lead exposure in mottled ducks
We compared lead shot ingestion rates and bone lead levels in mottled ducks (Anas fulvigula maculosa) for regional differences and evaluated 16 years of lead shot ingestion data for evidence of decline. Gizzards (n=6,850) of hunter-killed mottled duck were collected from 1987–2002. The mean lead sho...
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| Published in: | Wildlife Society bulletin Vol. 33; no. 3; pp. 1002 - 1008 |
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| Main Authors: | , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Oxford, UK
Blackwell Publishing Ltd
01-09-2005
The Wildlife Society |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | We compared lead shot ingestion rates and bone lead levels in mottled ducks (Anas fulvigula maculosa) for regional differences and evaluated 16 years of lead shot ingestion data for evidence of decline. Gizzards (n=6,850) of hunter-killed mottled duck were collected from 1987–2002. The mean lead shot ingestion rate of mottled ducks from the Central Texas Coast and Upper Texas Coast was 7.32%±1.13% (SE) and 18.09%±1.55%, respectively. Lead shot ingestion rates declined gradually during the study period (P = 0.046). During the 1998–1999 hunting season, we examined lead concentrations in wing bones of 148 hunter-killed mottled ducks from the Central Texas, Upper Texas, and Southwest Louisiana coastal regions. Lead concentrations averaged 16.62 ppm±1.83 (SE) and did not differ among regions or age groups. Both lead shot ingestion rates and bone lead concentrations in mottled ducks remain high. Studies evaluating the effects of lead levels on mottled duck survival are needed. |
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| Bibliography: | istex:B440DA250A500A42C12B911AE083C241021F8BA6 ArticleID:WSB4260 ark:/67375/WNG-HFSV2RML-8 David S. Lobpries (photo) has been a biologist with the Texas Parks and Wildlife Department since 1973, the same year he received his B.S. in Wildlife and Fisheries Science from Texas A&M University. He is a waterfowl and wetlands biologist and is stationed on the Texas Coast. His professional interests include wetland management and restoration, and waterfowl and wetland research. Over the course of his career, he has been involved in research on mottled ducks, cavity nesting ducks, and wintering waterfowl. Since 1992, he has represented the Central Flyway on annual white‐fronted geese surveys in Saskatchewan. Jim E. Neaville received a B.S. in Range and Wildlife Management from Texas Tech University in 1971. Other than a brief stint with United States Department of Agriculture's Soil Conservation Service, he spent the remainder of his career with the United States Fish and Wildlife Service (USFWS). He was a wildlife biologist for the USFWS Mid‐Continent Waterfowl Management Project in Minnesota from 1978–1984. In 1985, he moved back to the Texas Gulf Coast, serving as the waterfowl biologist for all National Wildlife Refuges (NWRs) on the coast. Before retiring in 2003, he was the biologist for the NWRs of the Texas Chenier Plain NWR Complex. His professional interests included management and research of coastal wetlands and waterfowl. In 1985, he initiated a mottled duck breeding‐pair survey and monthly surveys of wintering waterfowl on NWRs, both of which are still in place. In addition, he was involved in numerous other wetland and waterfowl research efforts along the Gulf Coast from 1985–2003. J. Dale Ortego is a professor in the Department of Chemistry and Physics at Lamar University, Beaumont, Texas. He received a B.S. in Chemistry from the University of Southwestern Louisiana in 1963 and a Ph.D. in Inorganic/Physical Chemistry from Louisiana State University in 1968. He has served on the editorial board for Waste Management, has been involved in developing science curriculum in secondary schools, and is currently the Regents' Professor of Chemistry. His research interests include inorganic and environmental chemistry. His recent research efforts have focused on organic and heavy metal concentrations in natural waters, and the chemical compatibility and long‐term behavior of geosynthetics with hazardous wastes. M. Todd Merendino is the Project Leader of Texas Parks and Wildlife Department's Central Coast Wetland Ecosystems Project. His professional interests include wetland and wildlife management, wetland mitigation, and research activities on waterfowl and alligators along the Texas Coast. He received his B.S. (Wildlife Management) and M.S. (Wildlife Science) from Texas Tech University and his Ph.D. (Zoology) from the University of Western Ontario. He is a certified wetland scientist with the Society of Wetland Scientists. William P. (Bill) Johnson is a waterfowl and wetlands biologist with the Texas Parks and Wildlife Department. He has degrees in English and business administration from Northwestern State University, Louisiana, and received an M.S. in Wildlife from Louisiana State University in 1995. His interests include wetland management and restoration, particularly playa lakes, and waterfowl research. His recent research activities have included mottled duck population genetics and migration chronology of waterfowl and other wetland birds on playa lakes. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 0091-7648 1938-5463 |
| DOI: | 10.2193/0091-7648(2005)33[1002:RDALTI]2.0.CO;2 |