产卵种群年龄结构的长期变化影响巴伦支海鳕鱼的气候招募联系

IF 1.9 2区 农林科学 Q2 FISHERIES Fisheries Oceanography Pub Date : 2022-08-15 DOI:10.1111/fog.12605
Geir Ottersen, Rebecca E. Holt
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引用次数: 2

摘要

鱼类种群可能会产生大量的后代,而一个新群体中只有一小部分高度可变的存活时间足够长,可以作为新兵进入渔场。很直观的是,产卵种群的大小和状态,即鱼类种群的成年部分,对招募很重要。此外,环境条件可以极大地影响生命早期脆弱阶段的生存,直到招募。因此,为了理解是什么调节了鱼类种群动态的重要组成部分——繁殖,有必要解释产卵种群和环境波动的影响,包括相互作用。在这里,我们研究了环境和招募之间的联系是否受到产卵种群状态的影响,包括生物量、平均年龄和年龄多样性。具体来说,我们重新评估了假设,即由幼鱼和少数年龄类别主导的产卵种群的招募更容易受到环境波动的影响。我们对巴伦支海大西洋鳕鱼种群的早期工作进行了扩展,现在的数据系列向后和向前扩展,涵盖了1922年至2019年期间。虽然我们的发现是相关的,不能证明一个特定的因果机制,但它们支持了早期的工作,并加强了上述假设的证据。此外,这项研究支持对渔业管理的建议应包括考虑环境状况。
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Long-term variability in spawning stock age structure influences climate–recruitment link for Barents Sea cod

Fish populations may spawn a vast number of offspring, while only a small and highly variable fraction of a new cohort survives long enough to enter into the fisheries as recruits. It is intuitive that the size and state of the spawning stock, the adult part of the fish population, is important for recruitment. Additionally, environmental conditions can greatly influence survival through vulnerable early life stages until recruitment. To understand what regulates recruitment, an essential part of fish population dynamics, it is thus necessary to explain the impact of fluctuations in both spawning stock and environment, including interactions. Here, we examine if the connection between the environment and recruitment is affected by the state of the spawning stock, including biomass, mean age and age diversity. Specifically, we re-evaluate the hypothesis stating that recruitment from a spawning stock dominated by young fish and few age classes is more vulnerable to environmental fluctuations. We expand upon earlier work on the Barents Sea stock of Atlantic cod, now with data series extended in time both backwards and forwards to cover the period 1922–2019. While our findings are correlative and cannot prove a specific cause and effect mechanism, they support earlier work and strengthen the evidence for the hypothesis above. Furthermore, this study supports that advice to fisheries management should include considerations of environmental status.

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来源期刊
Fisheries Oceanography
Fisheries Oceanography 农林科学-海洋学
CiteScore
5.00
自引率
7.70%
发文量
50
审稿时长
>18 weeks
期刊介绍: The international journal of the Japanese Society for Fisheries Oceanography, Fisheries Oceanography is designed to present a forum for the exchange of information amongst fisheries scientists worldwide. Fisheries Oceanography: presents original research articles relating the production and dynamics of fish populations to the marine environment examines entire food chains - not just single species identifies mechanisms controlling abundance explores factors affecting the recruitment and abundance of fish species and all higher marine tropic levels
期刊最新文献
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