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        Fishes associating with the echinoids Diadema setosum and Echinothrix calamaris (Diadematoida: Diadematidae) in the Phi Phi Islands of southwestern Thailand

        Floyd E. Hayes,Madeline E. Eastman,John C. Duncan 국립중앙과학관 2023 Journal of Asia-Pacific Biodiversity Vol.16 No.3

        Many fish species are known to associate with echinoids. We studied the frequency of fishes associatingwith the diadematid Black Longspine Urchin Diadema setosum and Banded Sea Urchin Echinothrix cal amaris in the Phi Phi Islands of southwestern Thailand during July 17e20, 2022. A total of 1373 fishindividuals of 20 species associated with 1157 D. setosum, and 11 fish individuals of seven speciesassociated with 76 E. calamaris. The proportion of fish individuals per echinoid host was 8.2 times higherfor longer-spined D. setosum (1.19) than for E. calamaris (0.14), and the proportion of echinoids hostingone or more fish was 2.5 times higher for D. setosum (22.9%) than for E. calamaris (9.2%), supporting thehypothesis that fishes prefer to associate with echinoid species with the longest spines, which potentiallyprovide more protection against predators. All fishes associating with echinoids were small (<10 cm);most were adults, but for some species, all were juveniles. All fishes were facultative associates ofechinoids. Only three fish species had been previously reported associating with D. setosum and nonewith E. calamaris; the remaining fish species represent new records of association, including 17 forD. setosum and seven for E. calamaris.

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