The roseate tern: World distribution and status of a threatened species
1983; Elsevier BV; Volume: 25; Issue: 2 Linguagem: Inglês
10.1016/0006-3207(83)90055-1
ISSN1873-2917
Autores Tópico(s)Animal Ecology and Behavior Studies
ResumoThe roseate tern Sterna dougallii Montagu (Aves, Laridae) has a nearly cosmopolitan breeding distribution. The North American and European populations, the only ones which have been well-documented, have both declined drastically in the past decade, raising grave concern over the species' future. Literature search and correspondence reveal that the species currently maintains substantial breeding populations in the Indian Ocean, Caribbean, and Australasian regions. Most old reports provide no quantitative population estimates, while even many recent reports provide only vague estimates of population size. Nonetheless it has been possible to estimate regional populations in most cases to within one order of magnitude. The North American and Caribbean populations total about 10 000 pairs, while the European population is about 1500 pairs. The African population, including the Seychelles and the western Indian Ocean, may have 15 000 to 22 000 pairs. The documented world population is between 20 000 and 30 000 pairs, but the breeding populations of many areas are not yet documented. Substantial variation within and between regions in appearance and breeding biology indicates that each of the five named forms, at least, should be studied and managed separately.
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