Six species of Charadriidae were recorded at Ilha Comprida beach (South São Paulo State coast, Brazil) during weekly censuses over 3 years (1999, 2000, and 2001). They were grouped in this area taking into account their abundance and permanence on the flat. The first cluster was formed by Charadrius collaris, C. semipalmatus, and Vanellus chilensis, which showed high abundance and were present on the flat throughout the year. The second cluster included Pluvialis dominica and P. squatarola. They were not abundant, and all individuals migrated to North America during the reproductive seasons. The third group includes one species, C. modestus, which was rare; this species was recorded in winter. The number of species and the number of individuals probably fluctuated because of migration or movements among neighboring beaches.
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Vol. 2005 • No. 212