小琉球爲全球少數的大型珊瑚礁島，潮間帶生物種類眾多里多樣。近年來小 琉球每年均湧入大量的遊客，遊憩的衝擊使得潮間帶生物多樣14與生物族群產生 急劇的變化。爲瞭解遊憩衝擊對小琉球潮間帶物種的組成與族群分布的影響，本 硏究於2011年5 - 6月進行潮間帶遊客人數與遊憩密度調査，並於2 - 6月進行垂 50 5
度、均勻度和生物多樣14指數最高，但族群密度卻較低»而以遊客數量較少的龍 蝦洞和肚仔坪的族群密度較高，其中最優勢的物種爲蜈蚣櫛蛇尾(Ophiocoma ■sco/opew加wa)，其次爲梅氏長海膽(Echirnrnetm mathaei)»蝶松櫛蛇尾的族群優 勢度對遊憩密度有明顯的反應，是小琉球潮間帶遊憩衝擊重要的生物指標。不同 潮間帶的族群數量的空間分布型態均不相同，但在每月間之族群分布型態，沒有 明顯的改變，其受到每月間時間變化的影響較少。在遊憩密度較大的潮間帶，個 25
族群密度，已降爲遊客較少地區的9.1% -爲了潮間帶生物資源的保育，未來對 小琉球地區潮間帶遊客的人數、遊憩活動與旅遊方式，均需謹慎明智的規劃與管 王串.o

Liuchio Hsu is one of the few big coral islands in the world. Varied and abundant species inhabit its intertidal zones. Recently, numerous visitors have flocked to the island every year, and these recreational visitors have significantly changed the biodiversity and biological populations in the intertidal zones. To understand on and population distribution, this study was conducted from May to June to survey visitor numbers and recreation density. The population was monitored using a 50-meter transection line perpendicular to the seashore from February to June of 2011. Among Duzeiping, Sanfu, Gebanwan, Yuchengwei and Lonshadong, the five main intertidal zones, in Yuchenwei and Sanfu, which have higher recreational densities, species richness, evenness and biodiversity index were higher than elsewhere, but the population densities were lower. There were fewer visitors at Lonshadong and Duzeiping than at the other three zones, and the population densities at these two zones were higher. The most dominant species was Brittle star (Ophiocoma scolopendrina) followed by Mathae’s urchin (Echinometra mathaei). The dominant ratio of Brittle star to recreational density, a biological indicator of recreational impact on intertidal zones in Liuchio Hsu. The spatial distribution patterns of populations varied among intertidal zones, but did not obviously differ from month to month. The patterns were little affected by monthly temporal changes. In the higher-recreational-density intertidal zones the individuals were obviously concentrated in the mid-tidal area 25 meters offshore. The population density of the more-visited intertidal zones the less-visited areas. To conserve intertidal biological resources, visitor numbers, recreational activities and tourism patterns for the intertidal zones of this island should be carefully and wisely planned and managed in the future.