Special Scientific Report--Wildlife 223
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The occurrence of lead pellets in gizzards indicates current ingestion rates, but be- cause of the complexity of factors influencing lead toxicity, it does not necessarily indicate mortality or the extent of sublethal effects. Residues in soft tissues such as liver, kidney, or blood indicate the amount of lead currently circulating in the bird and provide the best indication of acute toxicity or potential sublethal effects. The residues, however, do not indicate the source of the lead. Analysis... of lead in wing bones pro- vides an indirect assessment of a bird's exposure to lead and may be used to assess lead burdens arising from acute or chronic exposure and indicates geo- graphic patterns of lead exposure. In this procedure the extent of waterfowl mortality resulting from lead poisoning is not estimated.
The 1972-73 wing-bone survey demonstrated that lead occurs in the bodies of some immature ducks at levels that indicate high exposure over an interval of only a few months. Information now available sug- gests that much of lead found in the wing bones origi- nated from ingested lead pellets.
What to read after Special Scientific Report--Wildlife 223?
You can find similar books in the "Read Also" column, or choose other free books by U.S. Fish And Wildlife Service to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The occurrence of lead pellets in gizzards indicates current ingestion rates, but be- cause of the complexity of factors influencing lead toxicity, it does not necessarily indicate mortality or the extent of sublethal effects. Residues in soft tissues such as liver, kidney, or blood indicate the amount of lead currently circulating in the bird and provide the best indication of acute toxicity or potential sublethal effects. The residues, however, do not indicate the source of the lead. Analysis... of lead in wing bones pro- vides an indirect assessment of a bird's exposure to lead and may be used to assess lead burdens arising from acute or chronic exposure and indicates geo- graphic patterns of lead exposure. In this procedure the extent of waterfowl mortality resulting from lead poisoning is not estimated.
The 1972-73 wing-bone survey demonstrated that lead occurs in the bodies of some immature ducks at levels that indicate high exposure over an interval of only a few months. Information now available sug- gests that much of lead found in the wing bones origi- nated from ingested lead pellets.
What to read after Special Scientific Report--Wildlife 223?
You can find similar books in the "Read Also" column, or choose other free books by U.S. Fish And Wildlife Service to read onlineMoreLess
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