Modelling the effect of habitat and fishing heterogeneity on the performance of a Total Allowable Catch-regulated fishery
Modelling the effect of habitat and fishing heterogeneity on the performance of a Total Allowable Catch-regulated fishery
复制标题
模拟栖息地和捕捞异质性对总允许捕捞量调节渔业绩效的影响
DOI：
10.1093/icesjms/fsac067
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发表时间：
2022
影响因子：
3.3
通讯作者：
Kaplan, ed., David
中科院分区：
文献类型：
--
作者：
Pourtois, Julie D.;Provost, Mikaela M.;Micheli, Fiorenza;De Leo, Giulio A.;Kaplan, ed., David
渔业的特点往往是生境质量和捕捞努力量的空间分布高度不均匀。然而，在一些渔业中，实现可持续产量的目标是通过限制总允许渔获量来实现的，总允许渔获量被设定为总种群的一部分，而不管种群的空间分布和捕捞努力量。在这里，我们使用一个整体的投影模型来调查如何股票丰富度和捕获的绿色鲍鱼渔业在Isla Natividad，墨西哥，是由异质性的相互作用的影响，在栖息地质量和捕捞努力，以及这些相互作用是否改变与Allee效应，在低密度人口的生殖失败。我们发现，高质量的地区开发不足时，捕捞压力是均匀的，但栖息地是异质的。然而，这导致不同的渔业结果取决于种群的开发状况，即：次优开发时，总可捕量设定为最大可持续产量，和稳定的崩溃时，渔业过度开发。集中在生产区的捕捞努力量可以弥补这一影响，这在两种情况下同样会产生相反的后果：如果总可捕量是可持续的，渔业业绩会增加，但过度捕捞的渔业业绩会下降。这些结果仅在包含Allee效应时才成立。
Fisheries are often characterized by high heterogeneity in the spatial distribution of habitat quality, as well as fishing effort. However, in several fisheries, the objective of achieving a sustainable yield is addressed by limiting Total Allowable Catch (TAC), set as a fraction of the overall population, regardless of the population's spatial distribution and of fishing effort. Here, we use an integral projection model to investigate how stock abundance and catch in the green abalone fishery in Isla Natividad, Mexico, are affected by the interaction of heterogeneity in habitat quality and fishing effort, and whether these interactions change with Allee effects—reproductive failure in a low-density population. We found that high-quality areas are under-exploited when fishing pressure is homogeneous but habitat is heterogeneous. However, this leads to different fishery outcomes depending on the stock's exploitation status, namely: sub-optimal exploitation when the TAC is set to maximum sustainable yield, and stability against collapses when the fishery is overexploited. Concentration of fishing effort in productive areas can compensate for this effect, which, similarly, has opposite consequences in both scenarios: fishery performance increases if the TAC is sustainable but decreases in overexploited fisheries. These results only hold when Allee effects are included.