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首页> 外文期刊>Conservation Biology >Crossing Invisible Boundaries: the Effectiveness of the Langebaan Lagoon Marine Protected Area as a Harvest Refuge for a Migratory Fish Species in South Africa
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Crossing Invisible Boundaries: the Effectiveness of the Langebaan Lagoon Marine Protected Area as a Harvest Refuge for a Migratory Fish Species in South Africa

机译：越过无形边界：兰格班礁湖海洋保护区作为南非移栖鱼类物种的避难所的效力

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The application of no-take areas in fisheries remains controversial. Critics argue that many targeted species are too mobile to benefit from area protection and that no-take areas are only appropriate for resident species. The degree of protection does not depend on the size of the no-take area but rather on the time fish reside inside its boundaries during key life-history events (i.e., spawning) and during periods of peak fishing activity. We evaluated the potential of a small no-take marine protected area (MPA) inside a coastal embayment as a harvest refuge for a mobile, possibly migratory, long-lived fish species. We used acoustic telemetry to track movements of 30 transmitter-tagged white stumpnose (Rhabdosargus globiceps) across and on both sides of the boundary of a small (34 km(2)) no-take area over a full year. Being landlocked on 3 sides, the location of the MPA inside the lagoon made it practical to detect all boundary crossings and to calculate the time individual fish used the MPA. We detected frequent movements across the boundary, with strong seasonal and individual variations. There were significant differences in MPA use patterns between fish from different release areas. The time spent in the MPA by individual fish during summer (mean 50%; max 98%) was out of proportion with the size of that area (4% of total habitat). Summer coincided with peak recreational fishing activity and with the spawning season of this species. The small MPA provided a refuge for a part of the spawning stock of white stumpnose. Our findings suggest that if strategically placed, a small no-take area can be effective in protecting mobile species and that models of spillover from no-take areas should account for seasonal and individual variation in area use and the spatiotemporal distribution of fish and fishers.
机译：禁渔区在渔业中的应用仍存在争议。批评者认为，许多目标物种的机动性太强，无法从区域保护中受益，并且禁区仅适合于居住物种。保护的程度不取决于不准捕捞区的大小，而取决于关键的生命历史事件（即产卵）和高峰捕捞活动期间鱼类在其边界内停留的时间。我们评估了在沿海隔离带内建立一个小的不带捕捞的海洋保护区（MPA）的潜力，该保护区是移动性，可能迁移性，长寿命鱼类的避难所。我们使用声学遥测技术来跟踪30个带有发射器标记的白色树桩（Rhabdosargus globiceps）在整个小禁区（34 km（2））边界两侧和两侧的运动。 MPA位于三个侧面，在泻湖内的位置使检测所有边界交叉点和计算单个鱼类使用MPA的时间变得切实可行。我们发现跨界移动频繁，季节性和个体差异很大。不同释放区域的鱼类在MPA的使用方式上有显着差异。夏季，单个鱼在MPA中花费的时间（平均50％;最大98％）与该区域的大小（占总栖息地的4％）不成比例。夏季恰逢休闲垂钓活动高峰以及该物种的产卵季节。小型MPA为一部分产卵的白色树桩提供了庇护。我们的发现表明，如果从战略角度考虑，较小的禁食区可以有效地保护流动物种，并且禁渔区的溢出模型应考虑到区域使用的季节性和个体差异以及渔民和渔民的时空分布。

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