Use of a counterfactual approach to evaluate the effect of area closures on fishing location in a tropical tuna fishery.
Use of a counterfactual approach to evaluate the effect of area closures on fishing location in a tropical tuna fishery.
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DOI：
10.1371/journal.pone.0174758
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Milner-Gulland EJ
中科院分区：
文献类型：
--
作者：
Davies TK;Mees CC;Milner-Gulland EJ
禁渔区广泛用于海洋养护和渔业管理，必须了解禁渔区对实现管理目标的贡献。以前对禁区影响的许多评价都采用了前后比较的方法，这种方法在没有控制所有因素的情况下，不能将船队行为的变化归因于禁区关闭本身。在这项研究中，我们使用了一个反事实的方法来解开两个封闭区的捕捞位置的影响，从其他竞争的影响印度洋金枪鱼围网渔业的行为。我们的研究结果显示，在考虑到环境条件对船队行为的影响后，几年之间的封闭区域之一的效果不一致。这表明，关闭该地区的政策本身并不是船队将其努力分配到其他地方的主要驱动力。我们亦发现，由于两个禁区在渔业区内的位置不同，因此在效果上有显著的差异。这些调查结果突出表明，在预测或评估禁渔区对实现养护和渔业管理目标的贡献时，需要考虑其他关键的船队行为驱动因素。
Spatial closures are widely used in marine conservation and fisheries management and it is important to understand their contribution to achieving management objectives. Many previous evaluations of closed area effects have used before-after comparisons, which, without controlling for a full range of factors, cannot ascribe changes in fleet behaviour to area closures per se. In this study we used a counterfactual approach to disentangle the effect of two closed areas on fishing location from other competing effects on the behaviour of the Indian Ocean tuna purse seine fishery. Our results revealed an inconsistent effect of the one of the closed areas between years, after taking into account the influence of environmental conditions on fleet behaviour. This suggests that the policy of closing the area per se was not the main driver for the fleet allocating its effort elsewhere. We also showed a marked difference in effect between the two closed areas resulting from their different locations in the fishery area. These findings highlight the need to account for other key fleet behavioural drivers when predicting or evaluating the contribution of area closures to achieving conservation and fishery management objectives.