Maternal spawning experience and thermal effects on offspring viability of chub mackerel and their influence on reproductive success
Maternal spawning experience and thermal effects on offspring viability of chub mackerel and their influence on reproductive success
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DOI：
10.3389/fmars.2022.1063468
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发表时间：
2022-12-23
影响因子：
3.7
通讯作者：
Kamimura, Yasuhiro
中科院分区：
文献类型：
--
作者：
Yoneda, Michio;Kitano, Hajime;Kamimura, Yasuhiro
母体对后代生存能力的影响极大地提高了被开发的海洋鱼类种群的生产力和恢复力。北太平洋西部鲭鱼生物量的时间趋势呈现周期性波动模式，但自2011年以来一直在快速增加。尽管对该物种在这些水域的种群动态机制有多种假设，但热环境条件对补充成功的影响存在矛盾。我们探讨了母体年龄和/或之前的产卵经历对圈养鲭鱼的卵和后代特性对热条件的影响。此外，根据圈养鱼类的生长速度和所经历的温度之间的关系，评估了野生标本所经历的温度。 1-3岁雌性产卵的大小与温度呈负相关，但母体年龄对卵大小和营养的影响显着，在给定温度下，2岁或3岁雌性（重复产卵者）产下的卵比1岁雌性（首次产卵者）产的卵更大且营养丰富。这种与温度和母体年龄相关的卵性状反映了首次摄食幼虫的标准长度。母体年龄对孵化后幼虫的饥饿耐受性和首次摄食幼虫体型的影响在3岁雌性幼虫中也很明显，与1岁雌性相比，表现出更长的饥饿耐受性和更大的体高。此外，在测试温度下，来自 3 岁雌性的幼虫生长速度明显快于 1 岁雌性的幼虫。圈养标本至25天龄的个体发育过程和生长速率与温度呈正相关。与此同时，野生标本在25天之前所经历的温度估计为18.0至20.3摄氏度。这些发现表明，鲭鱼的母体和后代性状之间存在相反的热反应，但主要新鱼所经历的温度可能被限制在可产卵的温度范围内。我们根据母体产卵经验和对生活史特征的热影响讨论了该物种的繁殖成功机制。
Maternal effects on offspring viability significantly contribute to the productivity and resilience of exploited marine fish populations. The temporal trend of biomass of chub mackerel (Scomber japonicus) in the western North Pacific showed cyclic fluctuation patterns, but it has been rapidly increasing since 2011. Although there are several assumptions regarding the mechanisms of the population dynamics of this species in these waters, there is a contradiction in the effects of thermal environmental conditions on recruitment success. We explored the effects of maternal age and/or previous spawning experience on egg and offspring traits of captive chub mackerel in response to thermal conditions. Moreover, from the relationship between the growth rate and temperature experienced by captive fish, the experienced temperatures of wild specimens were assessed. The sizes of eggs spawned from females aged 1-3 years were negatively correlated with temperature, but the effects of maternal age on egg size and nutrition were significant with larger and nutrient-rich eggs spawned from 2- or 3-year-old females (repeat spawners) than those from 1-year-old females (first-time spawners) at a given temperature. Such temperature- and maternal-age-dependent egg traits reflected the standard length of first-feeding larvae. The effects of maternal age on the starvation tolerance of larvae after hatching and body sizes of first-feeding larvae were also evident in larvae derived from 3-year-old females showing longer starvation tolerance and larger body heights than those from 1-year-old females. Further, larvae derived from 3-year-old females grew significantly faster than those from 1-year-old females at the tested temperatures. The process of ontogenetic development and growth rate of captive specimens until age 25 days were positively correlated with temperature. Meanwhile, the estimated temperatures experienced by wild specimens until age 25 days ranged from 18.0 to 20.3 degrees C. These findings suggested that there were opposing thermal responses between maternal and offspring traits of chub mackerel, but the temperatures experienced by the main recruit fish may be restricted within the range of temperatures available for spawning. We discuss the mechanisms of reproductive success of this species in accordance with the maternal spawning experience and thermal effects on life history traits.