. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 223 on nearby Frigate Cyhigh nocturnal increase on nearby Frigate Cay. Perhaps for this species, Frigate has better nocturnal roosting habitat for nonbreeding birds, , broader beaches, and therefore at night attracts some of the individuals from Price. 10001 400 PRICE. JANUARY 1987 PRICE. JULY 1987 FRIGATE. JANUARY 1988 FRIGATE. JULY 1991. 400 800 1200 1600 2000 2400 TIME (HRS) Figure 3. Numbers of Brown Boobies counted at different times of day and at different seasons on Price Cay and Frigate Cay. The Ma
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 223 on nearby Frigate Cyhigh nocturnal increase on nearby Frigate Cay. Perhaps for this species, Frigate has better nocturnal roosting habitat for nonbreeding birds, , broader beaches, and therefore at night attracts some of the individuals from Price. 10001 400 PRICE. JANUARY 1987 PRICE. JULY 1987 FRIGATE. JANUARY 1988 FRIGATE. JULY 1991. 400 800 1200 1600 2000 2400 TIME (HRS) Figure 3. Numbers of Brown Boobies counted at different times of day and at different seasons on Price Cay and Frigate Cay. The Masked Booby (Sula dactylatra) The numbers of Masked Boobies were higher on Price during the Austral summer than in winter but the opposite was true for Frigate. In winter, Frigate had more birds than did the smaller island, Price, but this was reversed in summer. In both seasons the total number of birds tended to be higher at night and dwindle during the day to rise again after 1600 hours. These changes were less marked in the season with the lesser number of birds (winter on Price and summer on Frigate). Breeding of the Masked Booby in the Swains peaks in winter rather than in summer (Table 1; note that these results differ from those of King, 1993). A large number of nonbreeding individuals had assembled on Frigate in summer and, because few of them were attending nests at that time of year, numbers were low on the island by day but many returned in the evening from foraging at sea and were on the island at night (Fig. 4). Frigate had more Masked Boobies during the season of lowest breeding (summer) than during the winter peak of breeding, suggesting it may be more suitable as a roosting station than as a breeding ground. The opposite is true for Price where numbers were highest at the winter breeding peak. This species favors bare sand for nesting and the more open vegetation on Price may make a better breeding habitat than the denser vegetation on Please note that
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