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Multiple life‐stage connectivity of Pacific halibut (Hippoglossus stenolepis) across the Bering Sea and Gulf of Alaska
Fisheries Oceanography ( IF 1.9 ) Pub Date : 2020-10-25 , DOI: 10.1111/fog.12512
Lauri L. Sadorus 1 , Esther D. Goldstein 2 , Raymond A. Webster 1 , William T. Stockhausen 2 , Josep V. Planas 1 , Janet T. Duffy‐Anderson 2
Affiliation  

Pacific halibut (Hippoglossus stenolepis) is managed as a single stock throughout the Gulf of Alaska (GOA) and eastern Bering Sea (BS), but biogeographical barriers and the potential for differential impacts of climate change may alter habitat use and distributions, and restrict connectivity between these ecosystems. To improve our understanding of larval dispersal pathways and migrations of young fish within and between GOA and BS, we (a) examined potential pelagic larval dispersal and connectivity between the two basins using an individual‐based biophysical model (IBM) focusing on years with contrasting climatic conditions and (b) tracked movement of fish up to age‐6 years using annual age‐based distributions and a spatiotemporal modeling approach. IBM results suggest that the Aleutian Islands constrain connectivity between GOA and BS, but that large island passes serve as pathways between these ecosystems. The degree of connectivity between GOA and BS is influenced by spawning location such that an estimated 47%–58% of simulated larvae from the westernmost GOA spawning location arrived in the BS, with progressive reductions in connectivity from spawning grounds further east. From the results of spatial modeling of 2‐ to 6‐year‐old fish, we can infer ontogenetic migration from the inshore settlement areas of eastern BS toward Unimak Pass and GOA. The pattern of larval dispersal from GOA to BS, and subsequent post‐settlement migrations back from BS toward GOA, provides evidence of circular, multiple life stage, connectivity between these ecosystems, regardless of climatic variability or year‐class strength.

中文翻译:

横跨白令海和阿拉斯加湾的太平洋大比目鱼(Hippoglossus stenolepis)的多个生命阶段连接

大比目鱼(Hippoglossus stenolepis)作为阿拉斯加湾(GOA)和白令海东部(BS)的单一种群进行管理,但是生物地理障碍和气候变化的不同影响潜力可能会改变栖息地的使用和分布,并限制这些生态系统之间的连通性。为了增进我们对GOA和BS之间以及之间的幼体扩散途径和幼鱼迁移的了解,我们(a)使用基于个体的生物物理模型(IBM)重点研究了多年对比的情况,研究了两个盆地之间潜在的上层幼体扩散和连通性气候条件;(b)使用年度年龄分布和时空建模方法跟踪直至6岁的鱼类运动。IBM的结果表明,阿留申群岛限制了GOA和BS之间的连接,但是大岛通行证是这些生态系统之间的通道。GOA和BS之间的连通程度受产卵位置的影响,因此,最西端的GOA产卵位置估计有47%–58%的模拟幼虫到达BS,随着产卵场向东延伸,连通性逐渐降低。从2到6岁鱼的空间建模结果,我们可以推断出从BS东部沿海定居区向Unimak Pass和GOA的成因迁移。从GOA到BS的幼虫扩散模式,以及随后的从BS到GOA的后沉降迁移,提供了这些生态系统之间的循环,多重生命阶段,连通性的证据,而与气候变化或年级强度无关。GOA和BS之间的连通程度受产卵位置的影响,因此,最西端的GOA产卵位置估计有47%–58%的模拟幼虫到达BS,随着产卵场向东延伸,连通性逐渐降低。从2到6岁鱼的空间建模结果,我们可以推断出从BS东部沿海定居区向Unimak Pass和GOA的成因迁移。从GOA到BS的幼虫扩散模式,以及随后的从BS到GOA的后沉降迁移,提供了这些生态系统之间的循环,多重生命阶段,连通性的证据,而与气候变化或年级强度无关。GOA和BS之间的连通程度受产卵位置的影响,因此,最西端的GOA产卵位置估计有47%–58%的模拟幼虫到达BS,随着产卵场向东延伸,连通性逐渐降低。从2到6岁鱼的空间建模结果,我们可以推断出从BS东部沿海定居区向Unimak Pass和GOA的成因迁移。从GOA到BS的幼虫扩散模式,以及随后的从BS到GOA的后沉降迁移,提供了这些生态系统之间的循环,多重生命阶段,连通性的证据,而与气候变化或年级强度无关。随着产卵场向东延伸,连通性逐渐降低。从2到6岁鱼的空间建模结果,我们可以推断出从BS东部沿海定居区向Unimak Pass和GOA的成因迁移。从GOA到BS的幼虫扩散模式,以及随后的从BS到GOA的后沉降迁移,提供了这些生态系统之间的循环,多重生命阶段,连通性的证据,而与气候变化或年级强度无关。随着产卵场向东延伸,连通性逐渐降低。从2到6岁鱼的空间建模结果,我们可以推断出从BS东部沿海定居区向Unimak Pass和GOA的成因迁移。从GOA到BS的幼虫扩散模式,以及随后的从BS到GOA的后沉降迁移,提供了这些生态系统之间的循环,多重生命阶段,连通性的证据,而与气候变化或年级强度无关。
更新日期:2020-10-25
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