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1 December 2004 Reduction of Organochlorine Residues in Goshawk Eggs (Accipiter gentilis) from Northern Germany (1971–2002) and Increasing Eggshell Index
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Abstract

We investigated unhatched eggs (n = 57) of Goshawks (Accipiter gentilis) from the period 1988–2002 and compared them with eggs (n = 134) from 1971–1978. Mean concentrations of PCBs, ∑DDT and HCB in the earlier period were (mg kg−1 lipid weight) 50.1, 126.6, and 117.7, while the values from the later period were statistically significantly lower: 27.7, 4.1, 0.1, respectively. Nevertheless, the concentration of PCB is relatively constant during the last 8–10 years. The variability of residues was lower within clutches than among clutches. No age-dependent accumulation in eggs could be demonstrated. A statistically significant lower shell index was measurable for the period 1971–1978, while this index during 2001–2002 was relatively high as it was during the late 18th century. We are suggesting a threshold value for effect concentrations on shell index. Residues of the DDT-group had an influence on the number of fledged young per nest site.

Wolfgang Scharenberg and Volkher Looft "Reduction of Organochlorine Residues in Goshawk Eggs (Accipiter gentilis) from Northern Germany (1971–2002) and Increasing Eggshell Index," AMBIO: A Journal of the Human Environment 33(8), (1 December 2004). https://doi.org/10.1579/0044-7447-33.8.495
Accepted: 1 November 2003; Published: 1 December 2004
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