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首页> 外文期刊>Conservation Biology >Demographic Evidence of Illegal Harvesting of an Endangered Asian Turtle
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Demographic Evidence of Illegal Harvesting of an Endangered Asian Turtle

机译：非法收获濒临灭绝的亚洲乌龟的人口证据

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Harvesting pressure on Asian freshwater turtles is severe, and dramatic population declines of these turtles are being driven by unsustainable collection for food markets, pet trade, and traditional Chinese medicine. Populations of big-headed turtle (Platysternon megacephalum) have declined substantially across its distribution, particularly in China, because of overcollection. To understand the effects of chronic harvesting pressure on big-headed turtle populations, we examined the effects of illegal harvesting on the demography of populations in Hong Kong, where some populations still exist. We used mark-recapture methods to compare demographic characteristics between sites with harvesting histories and one site in a fully protected area. Sites with a history of illegal turtle harvesting were characterized by the absence of large adults and skewed ratios of juveniles to adults, which may have negative implications for the long-term viability of populations. These sites also had lower densities of adults and smaller adult body sizes than the protected site. Given that populations throughout most of the species' range are heavily harvested and individuals are increasingly difficult to find in mainland China, the illegal collection of turtles from populations in Hong Kong may increase over time. Long-term monitoring of populations is essential to track effects of illegal collection, and increased patrolling is needed to help control illegal harvesting of populations, particularly in national parks. Because few, if any, other completely protected populations remain in the region, our data on an unharvested population of big-headed turtles serve as an important reference for assessing the negative consequences of harvesting on populations of stream turtles.
机译：亚洲淡水龟的捕捞压力非常大，这些龟的种群急剧减少是由于食品市场，宠物贸易和中药的不可持续收集造成的。由于分布过多，大头龟（Platysternon megacephalum）的种群在其分布范围内已大大减少，特别是在中国。为了了解长期捕捞压力对大头乌龟种群的影响，我们研究了非法捕捞对香港人口的人口统计的影响，该种群仍然存在。我们使用了标记捕获方法来比较具有采集历史记录的站点与完全保护区域中的一个站点之间的人口统计特征。具有非法捕捞海龟历史的地点的特点是没有大型成年龟和未成年幼鱼与成年比率的偏差，这可能对种群的长期生存产生负面影响。与受保护的地点相比，这些地点的成年人密度较低，成年人的体型较小。鉴于整个物种大部分范围内的种群都被大量捕捞，并且在中国大陆越来越难找到个体，因此随着时间的推移，从香港种群中非法收集海龟可能会增加。对人口进行长期监测对于追踪非法收集的影响至关重要，并且需要增加巡逻来帮助控制人口的非法收获，特别是在国家公园内。由于该区域中几乎没有其他受完全保护的种群，因此我们有关未捕捞大头龟种群的数据可作为评估捕捞对on流种群负面影响的重要参考。

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