. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 29 CAYO DEL ESTE t 100 M VEGETATION BOUNDARY BEACH BOUNDARY Cr CORAL RAMPARTS. Figure 17. Cayo del Este in Cayos Areas reef group showing Masked Booby (MB) and Magnificent Frigatebird (MF) subcolonies, 21 April 1986. Magnificent Frigatebird nested in six subcolonies on Cayo del Este. The largest subcolony, located near the center of the island, was situated in a barren area where the nests were constructed on the ground or on small mounds of guano (Figure 18). Many of the nests appeared abandoned. The remainde
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 29 CAYO DEL ESTE t 100 M VEGETATION BOUNDARY BEACH BOUNDARY Cr CORAL RAMPARTS. Figure 17. Cayo del Este in Cayos Areas reef group showing Masked Booby (MB) and Magnificent Frigatebird (MF) subcolonies, 21 April 1986. Magnificent Frigatebird nested in six subcolonies on Cayo del Este. The largest subcolony, located near the center of the island, was situated in a barren area where the nests were constructed on the ground or on small mounds of guano (Figure 18). Many of the nests appeared abandoned. The remainder of the subcolonies were positioned in clumps of T. gnaphalodes or S. maritima bushes. Most of the bushes in these clumps were dead. There was a total of 282 nests which contained 198 chicks in the six subcolonies. We found no eggs and all of the chicks were large but unable to fly. Cayo del Oeste - There was no nesting activity on Cayo del Oeste when the island was visited late in the afternoon of 22 April. The small central patch of vegetation contained only two S. maritima bushes and these bushes were used as resting or roosting sites by frigatebirds. Species Accounts The stage in the breeding cycle is one of the most important factors in determining the accuracy of population estimates in colonially nesting seabirds (Nelson 1979. Duffy and Nettleship 1992). In more equatorial regions some individuals of certain species breed during every month (Nelson 1978) and the adults and young leave the colonies when the young fledge. The constant turnover of breeding pairs at a site complicates the census of a seabird Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Press; National Research Council (U. S. ). Pacific Science Board; Smithsonian Institution; National Museum of Nat
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