. The Canadian field-naturalist. 1974 Gilbertson: Pollutants in Breeding Herring Gulls 279 Table 2 — Correlation coefficient between organochlorine sub- stances in Herring Gull eggs from colonies in three Great Lakes Correlation coefficient Dieldrin HCB PCB DDE Dieldrin HCB et al. (1973) showed that embryonic mortality was increased in eggs from poultry administered PCB in water. Death of embryos was found at levels in the yolk above 10-15 ppm on a wet-weight basis, 1500 which is nearly equivalent to 10-15 ppm in the whole egg on a dry-matter basis. Al
. The Canadian field-naturalist. 1974 Gilbertson: Pollutants in Breeding Herring Gulls 279 Table 2 — Correlation coefficient between organochlorine sub- stances in Herring Gull eggs from colonies in three Great Lakes Correlation coefficient Dieldrin HCB PCB DDE Dieldrin HCB et al. (1973) showed that embryonic mortality was increased in eggs from poultry administered PCB in water. Death of embryos was found at levels in the yolk above 10-15 ppm on a wet-weight basis, 1500 which is nearly equivalent to 10-15 ppm in the whole egg on a dry-matter basis. All the Herring Gull eggs collected from the Great Lakes are bet- ween one and two orders of magnitude above this effective level in poultry eggs. It would seem that the most probable major cause of the embryonic mortality is the presence of DDE and PCB in the eggs, though the other organochlorine substances may have contributed to the overall toxic effect on embryos. Organochlorine Substances Correlated The marked correlations between organochlo- rine substances in eggs collected from the different 1300 1100 900 700 500 300 00 A Lak e Ontario 0 Lake Erie Q Georgian Bay,Lake Huron. y = + 100 200 300 400 DDE in parts per million Pry matter Figure 6. Relationship between PCB and DDE in individual Herring Gull Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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