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eggshell thinning [1 record]

Record 1 2018-03-12

English

Subject field(s)
  • Effects of Pollution
  • Animal Biology
  • Poultry Production
CONT

Eggshell thinning or loss caused by DDT and other chlorinated fluorocarbons has been a major cause of declines in Brown Pelicans, terns, eagles, and other fish-eating birds.

CONT

High levels of toxic contaminants in the diet led to severe eggshell thinning during the 1960s and '70s and a dramatic decline in the cormorant population ….Thin-shelled eggs could not withstand the weight of the incubating bird and would break before reaching term, killing the embryo.

French

Domaine(s)
  • Effets de la pollution
  • Biologie animale
  • Élevage des volailles
CONT

Les concentrations élevées de contaminants toxiques dans l'alimentation des cormorans ont provoqué l'amincissement de la coquille des œufs pendant les années 60 et 70 […] Ce phénomène a eu un effet dévastateur sur la population de cormorans; les œufs aux coquilles trop fragiles ne pouvaient supporter le poids des adultes qui les couvaient et se brisaient avant d'éclore, ce qui tuait l'embryon.

CONT

L'amincissement ou la non formation de la coquille causé par le DDT [dichlorodiphényltrichloroéthane] et d'autres chlorurofluorurocarbones est l'une des principales causes du déclin des populations de pélicans bruns, de sternes, d'aigles et de pygargues et d'autres espèces d'oiseaux piscivores.

Spanish

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