Revisiting sardine recruitment hypotheses: Egg‐production‐based survival index improves understanding of recruitment mechanisms of fish under climate variability
Revisiting sardine recruitment hypotheses: Egg‐production‐based survival index improves understanding of recruitment mechanisms of fish under climate variability
复制标题
重新审视沙丁鱼补充假设：基于产蛋量的生存指数提高了对气候变化下鱼类补充机制的理解
DOI：
10.1111/faf.12564
复制
发表时间：
2021
影响因子：
6.7
通讯作者：
Yukami Ryuji
中科院分区：
文献类型：
--
作者：
Takasuka Akinori;Nishikawa Haruka;Furuichi Sho;Yukami Ryuji
产卵种群生物量(SSB)与年总产卵量(TEP)之间的比例一直是渔业管理的产卵者-招募模型和鱼类补充机制研究的固有假设。然而，最近有证据表明蛋的生产依赖于密度，这导致有必要在补充研究中重新考虑每个产卵群体生物量的补充的有效性，RPS是一个基于SSB的从孵化到补充的生存指数。在这里，我们通过重新分析黑潮洋流系统中太平洋日本沙丁鱼种群在数十年尺度上的数据，重新审视了基于每卵产量的沙丁鱼招募(RPE)的假设，这是一个基于TEP的生存指数。通过采用RPE，我们检测到从孵化到补充的存活率与大范围海洋气候异常、苗圃环境温度和早期生命阶段的生长速度之间存在统计上的显著关系。RPS没有检测到这些关系。我们建议在未来关于鱼类补充机制与环境和生物因素的关系的研究中，采用基于TEP的生存指数而不是基于SSB的指数。开发以产卵为基础的生存指数有可能增进对气候变化下鱼类补充机制的了解。
Proportionality between spawning stock biomass (SSB) and annual total egg production (TEP) has been an inherent assumption in spawner–recruitment models for fisheries management and studies on recruitment mechanisms in fish. However, recent evidence of density dependence in egg production has led to a need to reconsider the validity of recruitment per spawning stock biomass (RPS), which is a SSB‐based survival index from hatching to recruitment, in recruitment studies. Here we revisit sardine recruitment hypotheses based on recruitment per egg production (RPE), which is a TEP‐based survival index, by reanalyzing published data for the Pacific stock of Japanese sardine (Sardinops melanostictus) in the Kuroshio Current system at a multidecadal scale. By adopting RPE, we detected statistically significant relationships of the survival from hatching to recruitment to large‐scale ocean climate anomaly, ambient temperature in the nursery grounds and growth rate during the early life stages. None of these relationships were detected by RPS. We propose the adoption of TEP‐based survival indices rather than SSB‐based ones in future studies on recruitment mechanisms of fish in relation to environmental and biological factors. Developing egg‐production‐based survival indices has the potential to improve understanding of recruitment mechanisms of fish under climate variability.