Successful recruitment in small pelagic fish populations inhabiting upwelling zones is subject to variation in fecundity and is driven by spatial and temporal fluctuations in environmental conditions, that is, mainly sea surface temperature, salinity and food availability. These fluctuations in abiotic factors have stimulated small pelagic fish populations to exhibit specifically adapted spawning tactics. To better understand to what extent a short-lived exploited fish species such as bonga shad Ethmalosa fimbriata has adapted to an upwelling environment, we have investigated the interrelationship between upwelling intensity as a proxy for productivity and population fecundity by means of a virtual population analysis. We found that females of intermediate size contributed significantly more eggs to the population's fecundity than smaller or larger ones. Our model results further indicate that E. fimbriata exhibits a spawning preference at water temperatures of around 25 degrees C and upwelling intensities of around 2.5 m(3) s(-1) m(-1). Hence, we hypothesize that climate change-driven increases in sea temperatures and modifications of upwelling-favourable winds could significantly impact the species' reproductive biology. To understand how climate change might impact fisheries, spawning tactics of small pelagic fishes are important to assess as well as their recruitment success. Such information is particularly relevant in countries where the fishery is critical at socio-economic level, to better implement fisheries management addressing multiple stressors.

中文翻译：

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Bonga shad ( Ethmalosa fimbriata ) 在上升流环境中的产卵策略

居住在上升流区的小型远洋鱼类种群的成功招募受繁殖力变化的影响，并受环境条件的空间和时间波动驱动，即主要是海面温度、盐度和食物供应。非生物因素的这些波动刺激了小型远洋鱼类种群表现出特别适应的产卵策略。为了更好地了解诸如 bonga shad Ethmalosa fimbriata 之类的短命开发鱼类在多大程度上适应了上升流环境，我们通过虚拟种群分析调查了作为生产力和种群繁殖力代理的上升流强度之间的相互关系。我们发现中等大小的雌性为种群贡献了更多的卵子” s 的繁殖力比较小或较大的。我们的模型结果进一步表明 E. fimbriata 在 25 摄氏度左右的水温和大约 2.5 m(3) s(-1) m(-1) 的上升流强度下表现出产卵偏好。因此，我们假设气候变化导致的海水温度升高和上升流有利风的改变可能会显着影响该物种的生殖生物学。要了解气候变化可能如何影响渔业，小型中上层鱼类的产卵策略对于评估及其招募成功很重要。此类信息在渔业在社会经济层面至关重要的国家尤其重要，以更好地实施渔业管理以应对多重压力。fimbriata 在大约 25 摄氏度的水温和大约 2.5 m(3) s(-1) m(-1) 的上升流强度下表现出产卵偏好。因此，我们假设气候变化导致的海水温度升高和上升流有利风的改变可能会显着影响该物种的生殖生物学。要了解气候变化可能如何影响渔业，小型中上层鱼类的产卵策略对于评估及其招募成功很重要。此类信息在渔业在社会经济层面至关重要的国家尤其重要，以更好地实施渔业管理以应对多重压力。fimbriata 在大约 25 摄氏度的水温和大约 2.5 m(3) s(-1) m(-1) 的上升流强度下表现出产卵偏好。因此，我们假设气候变化导致的海水温度升高和上升流有利风的改变可能会显着影响该物种的生殖生物学。要了解气候变化可能如何影响渔业，小型中上层鱼类的产卵策略对于评估及其招募成功很重要。此类信息在渔业在社会经济层面至关重要的国家尤其重要，以更好地实施渔业管理以应对多重压力。我们假设气候变化驱动的海水温度升高和上升流有利风的改变可能会显着影响该物种的生殖生物学。要了解气候变化可能如何影响渔业，小型中上层鱼类的产卵策略对于评估及其招募成功很重要。此类信息在渔业在社会经济层面至关重要的国家尤其重要，以更好地实施渔业管理以应对多重压力。我们假设气候变化驱动的海水温度升高和上升流有利风的改变可能会显着影响该物种的生殖生物学。要了解气候变化可能如何影响渔业，小型中上层鱼类的产卵策略对于评估及其招募成功很重要。此类信息在渔业在社会经济层面至关重要的国家尤其重要，以更好地实施渔业管理以应对多重压力。