BIOMONITORING WITH THE BUZZARD BUTEO-BUTEO IN THE NETHERLANDS - HEAVY-METALS AND SOURCES OF VARIATION

Citation
Lp. Jager et al., BIOMONITORING WITH THE BUZZARD BUTEO-BUTEO IN THE NETHERLANDS - HEAVY-METALS AND SOURCES OF VARIATION, Journal fur Ornithologie, 137(3), 1996, pp. 295-318
Citations number
39
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Ornithology
Journal title
ISSN journal
0021-8375
Volume
137
Issue
3
Year of publication
1996
Pages
295 - 318
Database
ISI
SICI code
0021-8375(1996)137:3<295:BWTBBI>2.0.ZU;2-L
Abstract
The feasibility of using Buzzards found dead as indicators of environm ental contamination was tested. Liver, kidney, and tibia specimens wer e examined for the presence of Cd, Cu, Pb, Mn, and Fe, which were used as markers. All buzzards submitted to the Veterinary Institute in 199 2 were examined for cause of death and condition. Results showed that more than half had been poisoned or shot. As the condition of the bird s worsened, fat reserves were depleted before protein reserves. Concen trations of the heavy metals rose in liver and kidney as nutrient rese rves fell. Since the content of heavy metal per organ was not related to body condition, content was considered a better measure for biomoni toring. The concentrations of Cd, Cu, Pb, Mn, or Fe measured in buzzar ds were not toxic. In several places buzzards had recently ingested re latively large amounts Cd and/or Pb. Buzzards with high contents of Cd , Cu, Pb, and Mn were found in areas having more than average contamin ation. The North-South gradient in aerosol deposition and soil content of heavy metals (especially Cd & Pb) was reflected in the Buzzard. We concluded that the Buzzard is a suitable and cost-effective biomonito r, to investigate the bioavailability of ecocontaminants in large area s, to signal gross changes in food webs, and to monitor raptor persecu tion.