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首页> 美国卫生研究院文献>Journal of Insect Science >Dynamics of Reintroduced Populations of Oedipoda caerulescens (Orthoptera Acrididae) over 21 Years
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Dynamics of Reintroduced Populations of Oedipoda caerulescens (Orthoptera Acrididae) over 21 Years

机译：21年内再引入的拟花拟小轮虫（直翅目Ac科）种群的动态

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Conservation programs increasingly involve the reintroduction of animals which otherwise would not recolonize restored habitats. We assessed the long-term success of a project in which the Blue-winged grasshopper, Oedipoda caerulescens (L., 1758), was reintroduced to a nature reserve in Northwestern Switzerland, an alluvial gravel area where the species went extinct in the 1960s. In summer 1995, we released 110 individuals (50 females and 60 males) and 204 individuals (101 females and 103 males) into two restored gravel patches with sparse vegetation. We used a transect count technique to assess the population size of O. caerulescens in the years 1995–2004 and 2015–2016 and recorded the area occupied by the species. At both release sites, the populations persisted and increased significantly in size. Individuals that followed a newly created corridor established four new subpopulations. Seven years after reintroduction, O. caerulescens had reached a high abundance around the release sites and in the four colonized patches, indicating a successful project. At the same time, the dispersal corridor became increasingly overgrown by dense vegetation. Surveys 20 and 21 yr after introduction showed that the abundance of the Blue-winged grasshopper had strongly declined in the established subpopulations and moderately in the original release sites, owing to natural succession of the habitat and lack of disturbances, which reduced the area suitable for the species by 59%. Our study shows that reintroductions are unlikely to succeed without integration of long-term habitat management (in the present case maintenance of open ground).
机译：保护计划越来越多地涉及重新引入动物，否则这些动物将无法重新定居恢复的生境。我们评估了一项长期成功的项目，该项目将蓝翅蚱O Oedipoda caerulescens（L.，1758）重新引入瑞士西北部的自然保护区，该地区是冲积砾石区，该物种在1960年代灭绝。 1995年夏季，我们释放了110个个体（50个女性和60个男性）和204个个体（101个女性和103个男性）到两个恢复了植被稀疏的砾石斑块中。我们使用了一种横断面计数技术来评估1995-2004年和2015-2016年间的南美白蜡菌种群数量，并记录了该物种所占的面积。在两个释放地点，种群均持续存在并且规模明显增加。遵循新创建的走廊的个人建立了四个新的子群体。重新引入的七年后，ca.ulescens在释放点周围和四个定植的斑块中达到了很高的丰度，表明该项目成功。同时，分散的走廊越来越被茂密的植被所覆盖。引入后20年和21年的调查显示，由于栖息地的自然演替和缺乏干扰，蓝翅蚱grass的种群在既定的亚群中大量减少，在原始释放地点中度适度下降，从而减少了适宜的面积该物种增加了59％。我们的研究表明，如果不整合长期栖息地管理（在目前情况下为开阔地带），重新引入是不可能成功的。

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