Interchange between Gannet colonies

The paper by M. S. Cullen and R. Pratt (Brit. Birds 69: 88-90) added to the now considerable evidence that relatively massive increases—and sometimes substantial decreases— in the numbers of nest- or site-owning Gannets Sula bassana occur at many gannetries in successive years. I have discussed the details in The Sulidae: Gannets and Boobies (in press), b


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