. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 43 >- o -z. UJ z> o Ixl tr 40 30 20 10 - 0 Md= (N = 39) i i Md = (N=35) n n V, n 1, \YA \YA \V\ i. 9 II 13 15 17 19 21 SIZE CLASSES (CM) 23 25 27 Figure 33. Size-class frequency distributions of Acanthaster sampled at Muscat, Ra's Abu Da'ud and the Daymaniyat Islands (cross-hatched bars), and Bandar Jissah and Bandar Khayran (solid bars). Combined median (Md) disc diameter and sample size (N) are noted for each distribution. Search for juveniles. An effort was made to search for coral-feeding ju
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 43 >- o -z. UJ z> o Ixl tr 40 30 20 10 - 0 Md= (N = 39) i i Md = (N=35) n n V, n 1, \YA \YA \V\ i. 9 II 13 15 17 19 21 SIZE CLASSES (CM) 23 25 27 Figure 33. Size-class frequency distributions of Acanthaster sampled at Muscat, Ra's Abu Da'ud and the Daymaniyat Islands (cross-hatched bars), and Bandar Jissah and Bandar Khayran (solid bars). Combined median (Md) disc diameter and sample size (N) are noted for each distribution. Search for juveniles. An effort was made to search for coral-feeding juvenile Acanthaster that could mature and impact coral communities later. Other than the 7-11 cm (12-20 cm TD) juvenile starfish found in the general censuses (Figure 33), no juveniles were seen in the various microhabitats searched in 8 areas, which involved a total effort of man-hrs (Table 4). Small feeding scars occurred on corals in 3 areas (Sur, at a bay south of Bandar Khayran and in the Daymaniyat Islands), and it was assumed that Acanthaster caused these scars because they were observed near feeding starfish and other potential predators ( gastropod corallivores) were not found. Feeding observations. A quantitative assessment of the coral species attacked in the Daymaniyat Islands (site 62) revealed significant preferences for Montipora and Acropora, and an avoidance of Pocillopora damicornis (see Glynn, 1987). In the western Daymaniyat Islands (sites 57 and 58),. 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 Natural History (U. S. ); United States. Bureau of Sport Fisheries and Wildlife. Washington, D. C. : [Smithsonian Press]
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