Organochlorine Pollutants, Eggshell Thickness, and Reproductive Success of Black-Crowned Night-Herons in Idaho, 1979

Organochlorine Insecticide Residues in Eggs of the Little Tern ( Sterna albifrons ) in the Axios Delta, Greece

“…The same has been found for herons and egrets (Findholt & Trost 1985, Fitzner et al 1988. At present it is neither known where the populations of Little Terns breeding in the Axios Delta over winter nor their migration routes.…”

Heavy Metal, Organochlorine Pesticide, and PCB Residues in Eggs and Feathers of Herons Breeding in Northern Italy

“…observed and associated with reduced eggshell thickness and with low breeding success in black-crowned night-herons from Idaho during the 1970s (Findholt and Trost 1985). Fitzner et al (1988) found that levels as high as 26 ppm (DDE) and 13 ppm (PCBs) wet weight, respectively, exerted little influence on reproductive success of great blue herons Ardea herodias, and other studies (e.g., Connors et al 1975;Custer et al 1986;Furness et al 1989) have found heron reproduction not to be inhibited by apparently high availability of contaminants.…”

DDT, Chlordane, Toxaphene and PCB Residues in Newport Bay and Watershed: Assessment of Hazard to Wildlife and Human Health

“…The reference for this data point (Findholt and Trost 1985 ) reported a linear regression of shell thickness and log DDE egg residue that had a zero residue intercept of 0.26 mm. Since pre-DDT era shells in this study were 0.275 mm, the linear regression is likely to be inaccurate, particularly at low residue levels.…”