translate English to French: Increases in the numbers of Herring (Larus argentatus) and Great Black-backed (L. marinus) Gulls in North America (Kadlec and Drury 1968) were closely associated with declines in tern numbers (Kress et al., 1983).
De plus, le segment américain de la population du Nord-Est du continent a été déclaré en voie de disparition en 1987 (U. S. Fish and Wildlife Service, 1987).