Page 3 - Agostini_alii_2007
P. 3

58                               SHORT COMMUNICATIONS                   VOL. 41, NO.1

      Figure 1.  The study area and approximate paths used by European Honey-buzzards during spring migration across the
      Central Mediterranean (dotted arrow: expected path; CB 5 Cap Bon Peninsula; P 5 Pantelleria; M 5 Marettimo; U 5
      Ustica; L 5 Lipari Islands; SM 5 Straits of Messina).

      corded in 444 hr of observation (265 hr at Pantelleria,  Honey-buzzards were seen reaching the site from SW and
      179 hours at Marettimo). A total of 6446 individuals mi-  then leaving the island toward E. Prevailing winds, from N-
      grated in flocks, 5397 at Pantelleria, 1049 at Marettimo,  NNE, W-WNW-NW, and WSW-SW-SSW had a significant
      with an average flock size of 25.0 6 4.0 (SE) and 9.9 6  effect on the migratory flow at the two sites (x 2 5 45.92,
      1.3 (SE) birds, respectively and a maximum flock size of  df 5 2, P , 0.01, Table 1). During N-NNE and W-WNW-
      757 at Pantelleria. Among 142 (65.7%) flocks detected  NW winds flocks passed mostly via Pantelleria; conversely,
      over the sea while reaching Pantelleria, all were reported  during south-westerly winds, flocks passed mostly via Mar-
      from the WNW, apparently coming from the Cap Bon  ettimo, although during such atmospheric conditions ob-
      Peninsula (Fig. 1). A total of 74 (34.3%) flocks reached  servations were made mostly at Pantelleria because of poor
      the site undetected as they crossed the sea; of these, 53  visibility at Marettimo (x 2 5 13.96, df 5 2, P , 0.01, Ta-
      moved along the western coast heading NE, six headed  ble 1). Because of its geographic characteristics, Maret-
      SW, and 15 were observed inland. European Honey-buz-  timo not uncommonly experiences poor visibility (see also
      zards left Pantelleria heading NE. At Marettimo, European  Agostini and Logozzo 1998). The circadian pattern of mi-
   1   2   3   4   5   6