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| Titel: |
Breeding ecology of the Merlin Falco columbarius in Shetland |
| Auteur: |
Ellis, P. M. Okill, J. D. |
| Verschenen in: |
Bird study |
| Paginering: | Jaargang 37 (1990) nr. 2 pagina's 101-110 |
| Jaar: |
1990-07 |
| Inhoud: |
The breeding Merlin population in Shetland declined by about 50% between 1981 and 1983, and in 1982 breeding success was low at only 50%. Since then the population has substantially recovered and on average 68% of nesting pairs have been successful. However, 97% of nest failures occurred at the egg stage, with 59% apparently due to egg breakage by the Merlins themselves. The causes of the reduction in population and breeding success are not known; adverse weather conditions and nest predation were unlikely to have been significant, and levels of organochlorine residues and PCBs in addled eggs were low in comparison with Britain as a whole. However, mercury levels were the highest recorded in Britain and may have been implicated in nest failures. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 2 van 9 gevonden artikelen
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