The management of invasive species in large, little-known, nature reserves is difficult. Weighing the risk of invasion against the conservation value of each sector in nature reserves would help design viable management strategies. We evaluated the invasion risk of the Pacific oyster (Crassostrea gigas) in nature reserves in the Bahia Blanca estuary (Argentina). We tested the hypothesis that there were areas of high conservation value in the nature reserves that are susceptible to invasion by C. gigas. We measured its spatial expansion and increase in density on the north coast of the estuary from 2010 to 2015. This allows establishing its preferences of substrate type and tide level in the intertidal zone, hereafter geo-environmental units. We mapped these geo-environmental units within nature reserves using GIS analysis. We found high risk of invasion in 246 hectares of high priority sectors in nature reserves, which minimized the need of management efforts to 13.5% of the total area of nature reserves. We highlight the sectors where C. gigas would generate the strongest impact, as well as where management efforts would be more cost-effective. Our approach provides a framework that can be used to assess risk in nature reserves and help identify management priorities.

中文翻译：

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使用地理空间工具将自然保护区的保护优先事项和入侵的脆弱性结合起来可以优化管理工作

在大型、鲜为人知的自然保护区中管理入侵物种是很困难的。权衡入侵风险与自然保护区每个部门的保护价值将有助于设计可行的管理策略。我们评估了太平洋牡蛎（Crassostrea gigas）在巴伊亚布兰卡河口（阿根廷）自然保护区的入侵风险。我们检验了这样一个假设，即自然保护区中存在容易受到 C. gigas 入侵的高保护价值区域。从 2010 年到 2015 年，我们测量了它在河口北海岸的空间扩展和密度增加。这可以确定其对潮间带底物类型和潮位的偏好，以下称为地理环境单位。我们使用 GIS 分析绘制了自然保护区内的这些地理环境单元。发现自然保护区内246公顷重点区域的高入侵风险，将管理工作量降至自然保护区总面积的13.5%。我们强调了 C. gigas 将产生最大影响的部门，以及管理工作更具成本效益的部门。我们的方法提供了一个框架，可用于评估自然保护区的风险并帮助确定管理优先事项。