| Autor: |
J.H. Williams, S. Bailey, J.D. Norris, P.J. Bunyan, D. M. Jennings, P.I. Stanley |
| Rok vydání: |
1974 |
| Předmět: |
|
| Zdroj: |
Agro-Ecosystems. 1:323-338 |
| ISSN: |
0304-3746 |
| DOI: |
10.1016/0304-3746(74)90041-9 |
| Popis: |
Following the deaths of blackbirds in 1971 and 1972 an investigation was mounted into the comparative levels of DDT and its metabolites in soil, earthworms, moles, birds and their eggs in a small orchard in East Anglia. The build up of residues in the various organisms was demonstrated. It is suggested that blackbirds and thrushes store DDT in fat through the year. Due to increased food intake or stored fat mobilisation in the spring, there is a large and often lethal build-up of DDE residues in the birds due to a metabolic block. Pheasants appear to be affected directly byt he spraying operation. There appears to be no serious effect on the bird population in the orchards as a result of high residues and individual mortalities. Moles, although apparently not affected by the high DDT residues they carry, could be a hazard to certain predatory birds. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
