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Distribution Pattern of the Sea Urchin Strongylocentrotus nudus in Relation to Predation Pressure in Hosan, the East Coast of Korea  

유재원 (㈜한국연안환경생태연구소)
손용수 (국립수산과학원 동해수산연구소)
이창근 (㈜한국연안환경생태연구소)
김정수 (㈜한국연안환경생태연구소)
한창훈 (㈜한국연안환경생태연구소)
김창수 (㈜한국연안환경생태연구소)
문영봉 (국립수산과학원 동해수산연구소)
김동삼 (국립수산과학원 동해수산연구소)
홍재상 (인하대학교 해양학과)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.9, no.1, 2004 , pp. 40-49 More about this Journal
Abstract
An ecological study on a sea urchin population, Strongylocentrotus nudus, a key role species in recovery of macroalgal bed, was conducted in Hosan, Samcheok area on the east coast of Korea. Three experimental plots, namely, AMB (artificially-restored macroalgal bed), BG (barren grounds) and NMB (natural macroalgal bed) were established after a pilot survey in June 2002. Distribution and abundance, grazing rates, predation pressure and predator guilds on S. nudus were estimated in three plots bimonthly from Aug. to Dec., 2002. Abundance of S. nudus was lowest, but median test diameter of the urchin was highest (Kruskal-Wallis test, p-value, p<0.001 in Aug. and p=0.003 in Oct.) in NMB In-situ grazing rate of S. nudus estimated by enclosure cage experiment in NMB was about 12 times higher in Aug. (160.0 mg seaweed/g sea urchin/day) than in Oct. (13.8). Predation intensity measured by tethering experiment was higher in NMB. Most of the predators on S. nudus were invertebrates and no fish predators were found. Predator guilds identified by the fish trap experiment using live or dead sea urchins included who]ks Neptunea arthritica, starfish Asterina pectinifera, hermit crabs Pagurus of. samuelis, Paguristes barbatus, brown shawl crabs Atergatis integerrimus and crabs Actaea subglobosa. High predation pressure on S. nudus in natural macroalgal beds was the likely cause of its low density. Elevated sea urchin density and the consequent lasting deforestation of macroalgae in barren grounds demonstrate the importance of predation pressure on sea urchins.
Keywords
sea urchin; Strongylocentrotus nudus; grazing rate; tethering experiment; predation intensity; cage experiment; predator guild;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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