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首页> 外文期刊>Chelonian conservation and biology >Long-Term Monitoring of Green Turtle Nesting on Tromelin Island Demonstrates Stable Reproduction and Population Parameters
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Long-Term Monitoring of Green Turtle Nesting on Tromelin Island Demonstrates Stable Reproduction and Population Parameters

机译：长期监测特罗米林岛上的绿海龟筑巢显示稳定的繁殖和种群参数

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摘要

Situated about 500 km off the Malagasy east coast, the island of Tromelin is a key nesting site for the endangered green turtle, Chelonia mydas, in the south Western Indian Ocean. Nesting turtles found in this isolated island have been closely monitored since the 1970s, but the most recent estimates of nesting parameters date from 1986. Using mark-recapture data, track counts, and nests monitoring data collected over the 2009/2010 nesting peak, reproductive characteristics, population size, and offspring production were updated and discussed in the light of the track survey undertaken from 1986 to 2010. Females showed a consistent reproductive behaviour compared with previous studies in terms of clutch frequency (2.75 +/- 1.46) and nesting success (0.65). Nest indices such as hatching success (0.76 +/- 0.25) and emergence success (0.61 +/- 0.33) were also included in the range of values calculated in the 1980s. Importantly, the estimated number of nesters and production in eggs and hatchlings were similar to older estimates, suggesting a relative demographic stability. For the 2009/2010 year-long nesting season, the size of the nesting population was estimated at about 1500 individuals, which produced around 480,900 eggs (+/- 103,900), resulting in 289,200 emerging hatchlings (+/- 152,000). These results are promising and support the effectiveness of conservation measures undertaken in the Iles Eparses, but further comparable monitoring is needed in the coming years to confirm the stability in Tromelin's green turtle nesting population.
机译：Tromelin岛位于马达加斯加东海岸约500公里处，是印度西部南部濒临灭绝的绿海龟Chelonia mydas的重要筑巢地点。自1970年代以来，一直在严密监视在这个孤立的岛屿中发现的筑巢海龟，但最新的筑巢参数估计可追溯到1986年。使用在2009/2010筑巢高峰期间收集的标记捕获数据，航迹数和筑巢监视数据，可繁殖根据1986年至2010年进行的跟踪调查，对特征，种群数量和后代产量进行了更新和讨论。与以往的研究相比，雌性在离合频率（2.75 +/- 1.46）和筑巢成功方面表现出一致的生殖行为（0.65）。巢指数，例如孵化成功率（0.76 +/- 0.25）和出苗成功率（0.61 +/- 0.33）也包括在1980年代计算的值范围内。重要的是，鸡蛋和孵化场中的巢穴数量和产量的估计值与较早的估计值相似，表明人口相对稳定。在2009/2010年的为期一年的筑巢季节中，据估计筑巢种群约为1500只，产卵约480,900枚（+/- 103,900枚），导致289,200头孵化的幼体（+/- 152,000枚）。这些结果是令人鼓舞的，并支持在Iles Eparses中采取的保护措施的有效性，但是在未来几年中，需要进一步的可比监测以确认Tromelin绿海龟筑巢种群的稳定性。

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