摘要
綠蠵龜是臺灣五種海龜當中最常見，也是唯一會在臺灣產卵的海龜。小琉 球是綠蠵龜重要產卵區域，因此長期的保育工作已在此施行許久，以藉此保育 該物種。此計畫工作主要目的為，1)獲得在小琉球的母龜生殖生態之基礎資 料；以及 2)以擱淺通報系統資料進行該區域海龜受到人為活動威脅的情況。總 計有 7 頭母海龜於今年(2022)被觀察到，其皆為綠蠵龜。在這些海龜當中，28.5 %的海龜未見其身上有金屬標誌。海龜背甲曲線長度平均為 104.0 公分(n = 5)， 其平均產卵窩數為 3.1 窩。海龜平均產卵間隔的天數為 11.2 天。海龜的卵窩平 均深度為 62 公分。總計有 22 個卵窩在調查期間被記錄到，卵窩的平均卵數為 97.5 顆，孵化率約為 6 成左右。此外，根據臺灣南部擱淺資料顯示，相較於墾 丁地區的海龜，小琉球的擱淺海龜有較高的比例(如船隻撞擊)，可見其有人為 活動造成的影響。未來應考量就小琉球海龜所受之人為活動威脅採取保護措 施，並持續從攝食場域和產卵棲地進行監測來評估這些保育措施的成效。

Abstract
Among the five marine turtle species recorded in Taiwan, the green turtle (Chelonia mydas) is the most common species and the only one that nests in Taiwan. Because Liuchiu Island is an important green turtle nesting area in Taiwan, continuous conservation efforts have been conducted in this area to protect this endangered species. The major goals of this project were therefore: 1) to obtain information about the nesting ecology of green turtles in Liuchiu Island and 2) to analyze the past 5 years of sea turtle strandings in southern Taiwan to obtain information on anthropogenic threats to marine turtles in Liuchiu Island. A total of 7 individual female green turtles engaged in nesting activities were identified during the fivemonth census period, July – December 2022. No other species of marine turtle was recorded as nesting during this period. For the 2022 nesting season 28.5 % of turtles were previously untagged. The mean size of all nesting female green turtles was curved carapace length = 104.0 cm (n = 5) and laid, on average, 3.1 nests per female. The mean inter-nesting interval was 11.2 days. Average nest depth was 62.0 cm. A total of 22 clutches were discovered during the census. The average number of eggs in nests was 97.5. The mean incubation success was 60.5%. The present work also provides long-term data about stranded sea turtles in southern Taiwan. Regarding the anthropogenic threats to marine turtles, stranded sea turtles discovered in Liuchiu Island showed with more signs of anthropogenic activities (e.g. boat strikes) than those in Kenting. Threat mitigation strategies are needed to be considered in Liuchiu Island. Long-term monitoring at nesting beaches and foraging ground is required to assess the efficacy of threat mitigation in Liuchiu Island for green turtles.