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The value of long-term, community-based monitoring of marine turtle nesting: a study in the Lamu archipelago, Kenya

机译：基于社区的长期监测海龟筑巢的价值：肯尼亚拉木群岛的一项研究

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摘要

Monitoring of nesting beaches is often the only feasible and low-cost approach for assessing sea turtle populations. We investigated spatio-temporal patterns of sea turtle nesting activity monitored over 17 successive years in the Lamu archipelago, Kenya. Community-based patrols were conducted on 26 stretches of beach clustered in five major locations. A total of 2,021 nests were recorded: 1,971 (97.5%) green turtle Chelonia mydas nests, 31 (1.5%) hawksbill Eretmochelys imbricata nests, 8 (0.4%) olive ridley Lepidochelys olivacea nests and 11 (0.5%) unidentified nests. Nesting occurred year-round, increasing during March-July, when 74% of nests were recorded. A stable trend in mean annual nesting densities was observed in all locations. Mean clutch sizes were 117.7 +/- SE 1 eggs (range 20-189) for green turtles, 103 +/- SE 6 eggs (range 37-150) for hawksbill turtles, and 103 +/- SE 6 eggs (range 80-133) for olive ridley turtles. Curved carapace length for green turtles was 65-125 cm, and mean annual incubation duration was 55.5 +/- SE 0.05 days. The mean incubation duration for green turtle nests differed significantly between months and seasons but not locations. The hatching success (pooled data) was 81.3% (n = 1,841) and was higher for in situ nests (81.0 +/- SE 1.5%) compared to relocated nests (77.8 +/- SE 1.4%). The results highlight the important contribution of community-based monitoring in Kenya to sustaining the sea turtle populations of the Western Indian Ocean region.
机译：监视嵌套海滩常常是评估海龟种群的唯一可行且低成本的方法。我们调查了肯尼亚拉木群岛连续17年监测到的海龟筑巢活动的时空格局。在五个主要地点的26条海滩上进行了社区巡逻。总共记录了2,021个巢：1,971个（97.5％）绿海龟Chelonia mydas巢，31个（1.5％）E Eretmochelys imbricata巢，8个（0.4％）橄榄ridley Lepidochelys olivacea巢和11个（0.5％）未识别的巢。筑巢全年发生，在3月到7月期间有所增加，当时记录到74％的筑巢。在所有地点均观察到平均年巢密度的稳定趋势。绿海龟的平均离合器大小为117.7 +/- SE 1卵（范围20-189），鱼为103 +/- SE 6卵（范围37-150），以及103 +/- SE 6卵（范围80- 133）。绿海龟的弯曲甲壳长度为65-125厘米，平均每年潜伏期为55.5 +/- SE 0.05天。绿海龟巢的平均潜伏期在几个月和季节之间有显着差异，但位置不同。孵化成功率（合并数据）为81.3％（n = 1,841），并且与重新定位的巢（77.8 +/- SE 1.4％）相比，原位巢的孵化成功率更高（81.0 +/- SE 1.5％）。结果强调了肯尼亚社区监测对维持西印度洋地区海龟种群的重要贡献。

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