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DDE concentration and percent eggshell thinning in Double-crested Cormorant eggs

Year	DDE (ppm)^*	Eggshell thickness (mm)^**	Percent eggshell thinning^***
1971	17.75	0.30	30.2
1972	13.83	--	--
1973	15.40	--	--
1975	5.34	--	--
1979	2.45	0.37	16.3
1989	1.95	0.44	0.0^****
1995	2.26	0.43	0.0^****

^* From Table 1 of this technical supplement.
^** Environment Canada, Canadian Wildlife Service, Ontario Region, D.V. Weseloh, personal communication.
^*** Percent thinning relative to pre-1947 thickness of 0.43 mm.
^**** Eggshells have returned to pre-1947 thickness.

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