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  • dose-response  (1)
  • seabirds  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The Influence of Age on Cadmium Concentrations in Seabirds (1998)
    Springer
    Environmental monitoring and assessment 50 (1998), S. 159-171 
    Details
    ISSN: 1573-2959
    Keywords: age ; biomonitoring ; heavy metals ; seabirds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The effects of age on cadmium concentrations was investigated in Cory's shearwater, Calonectris diomedea, Lesser black-backed gull, Larus fuscus, and great skuas, Catharacta skua. There was no evidence for the continued accumulation of cadmium with increasing adult age. Adult shearwaters did have higher concentrations of cadmium compared to young fledglings, but there was no significant difference between cadmium concentrations in adult and sub-adult gulls. In addition, the sample of great skuas were of known age (3–22 yrs old) and showed no evidence of increasing cadmium concentrations with adult age in liver or kidney. However, it is possible that age accumulation of cadmium in great skuas was masked by individual dietary preferences overriding the effects of increasing age. It is often assumed that cadmium concentrations continue to accumulate with increasing adult age, but seabirds may have evolved some as yet unknown mechanism for excretion or more rapid turnover of cadmium than previously thought. The implications of this for the use of seabirds as biomonitors is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005764008119
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The role of eggs in mercury excretion by Quail Coturnix coturnix and the implications for monitoring mercury pollution by analysis of feathers (1993)
    Springer
    Ecotoxicology 2 (1993), S. 55-64 
    Details
    ISSN: 1573-3017
    Keywords: mercury ; eggs ; feathers ; quail ; dose-response
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: This paper describes differences in the excretion of methyl mercury between male and female Quail Coturnix coturnix after a single dose. Since feathers are often used to monitor mercury pollution it is important to take into account biases in feather mercury levels that may arise as a result of mercury loss through egg-laying. Evidence is presented to support the use of bird eggs to sample for environmental mercury contamination. Birds were monitored up to twelve weeks after administration. Mercury concentrations in the kidney exceeded those in the liver which exceeded those in the pectoral muscle. Significant differences in mercury levels between male and female birds were found up to eight weeks after administration. Mercury was initially distributed through most of the internal tissues and was lost relatively slowly in a negative exponential manner. Mercury loss through excretion differed between the sexes for the first eight weeks after mercury administration. Initial mercury concentration in eggs was 3.5 μg g-1 but no mercury was detected in eggs five weeks after the dose was administered. At this point over 40% of the females' intake had been lost into the eggs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00058214
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    Paper (German National Licenses)
    Fulltext
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