SEASONAL ABUNOANCE ANO BEHAVIOUR OF COASTAL BIROS

• Main Authors: Ornitowgia Neorropical I, C. M. Vooren, A. Chiaradia
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 1990
• Subjects: development include di; Austral; Cassino; Calidris alba; Calidris canutus
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.558.765; http://www.ibiologia.unam.mx/pdf/links/neo/rev1/ornitol_1_9-24.pdf

Abstract. Fifty-one bird censuses were carried out along 60 km of beach to the south of Cassino, 32 °12'S, 52 °10'W; from May 1982 to December 1986. Mean monthly bird density was highest (80 to 100 birds/km) from February to April, and lowest (20 birds/km) in August and September. Thirty-three species were recorded, of which 7 terns, 3 gulls, 13 waders and 10 others (skua, jaegers, skimmer, sheathbill, cormorant, herons and hawks). Thirteen species were Permanent Users (including local breeders), 9 were Southern Hemisphere Migrants, and 11 were Northern Hemisphere Migrants. Waders reached peak numbers in austral spring and autumn due to passage of Northern Migrants: Calidris fuscicollis, Calidris alba, Calidris canutus, Pluvialis dominica and Pluvialis squatarola, some of these remaining in lesser numbers through summer. Winter waders were mainly the Permanent Users Charadrius collaris, Haematopus palliatus and Himantopus himantopus melanurus, and the Southern Migrant Charadrius falklandicus. Terns showed peak numbers in autumn (northbound Sterna sandvicensis eurygnatha and