DIFFERENCES IN MERCURY CONTAMINATION AND ELIMINATION DURING FEATHER DEVELOPMENT IN GULL AND TERN BROODS

Citation
Ph. Becker et al., DIFFERENCES IN MERCURY CONTAMINATION AND ELIMINATION DURING FEATHER DEVELOPMENT IN GULL AND TERN BROODS, Archives of environmental contamination and toxicology, 27(2), 1994, pp. 162-167
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Toxicology,"Environmental Sciences
ISSN journal
0090-4341
Volume
27
Issue
2
Year of publication
1994
Pages
162 - 167
Database
ISI
SICI code
0090-4341(1994)27:2<162:DIMCAE>2.0.ZU;2-P
Abstract
Eggs, feathers (down, body feathers from side/shoulder and back) and s ome dead chicks (liver) from broods of three species, herring gull (La rus argentatus), black-headed gull (Larus ridibundus), and common tem (Sterna hirundo) from the German North Sea coast were collected to stu dy intersibling differences in mercury contamination and elimination i nto the growing feathers. The mercury contamination in eggs, feathers, and liver of the terms was about four times that of the gulls; black- headed gulls had lowest mercury concentrations. The body feathers grow n when the chicks became older had lower mercury levels than down in t he more contaminated species (11% lower in herring gulls, 49% in commo n terms), indicating the advancing decontamination of the body by the plumage development. The elimination of mercury was greater in chicks with higher mercury levels. Down of the first hatched herring gull and common tem chick contained more mercury than down of the siblings hat ched later, because of its higher burden derived from the first laid e gg.