Vertical distribution and growth performance of Baltic cod larvae – Field evidence for starvation-induced recruitment regulation during the larval stage?
Vertical distribution and growth performance of Baltic cod larvae – Field evidence for starvation-induced recruitment regulation during the larval stage?
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波罗的海鳕鱼幼虫的垂直分布和生长性能——幼虫阶段饥饿诱导的补充调节的现场证据？
DOI：
10.1016/j.pocean.2011.04.001
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发表时间：
2011
影响因子：
4.1
通讯作者：
F. Köster
中科院分区：
文献类型：
--
作者：
B. Huwer;C. Clemmesen;P. Grønkjær;F. Köster
除了不同的卵存活率，以前的研究表明，幼体阶段可能是最关键的阶段，在确定波罗的海鳕鱼招聘的变化，和幼虫需要进行个体发育的垂直迁移从孵化深度（> 50米）的上层增加食物的可用性，以启动第一次进食，改善其营养状况和生长，并避免饥饿。最近，详细信息的阶段解决主要的波罗的海桡足类物种，包括首选的幼虫波罗的海鳕鱼猎物物种Pseudocalanus acuspes的垂直分布，已成为可用。因此，在2007年8月的波罗的海鳕鱼幼虫的垂直分布和深度依赖的营养状况和生长进行了调查。基于RNA-DNA的方法被用来估计生长，包括一种新的方法来估计生长性能，通过将观察到的特定生长率（SGR）的现场捕获的幼虫的温度依赖性的参考生长率（Gref）的快速增长的实验室饲养的鱼从文献。这种标准化的Gref被认为有很大的潜力，以改善调查的生长和生态的仔鱼。早期幼虫迁移到较浅的层的需要得到证实，而更大的规模类被发现在越来越大的深度。这可能反映了个体发育的垂直迁移的延续，以遵循越来越大的猎物项目在更深的温度跃层以下的较冷的沃茨，以节省能源。幼虫生长一般下降，增加深度，但增长的下降变得不那么明显，在较大的大小类。这表明，较大的幼虫更好地应对周围环境和更深处的可用猎物场。一般来说，波罗的海鳕鱼幼虫生长不良相比，从其他研究，这是讨论有关的捕食差异和可能的食物温度权衡幼虫在高度分层的波罗的海的幼虫。与早期的结果相比，在1994年和1995年的第一次摄食阶段后，饥饿幼虫的频率较高，较大幼虫的频率较低。由于这是一个时期的低波罗的海鳕鱼招聘尽管有利的条件，鸡蛋的生存，它的结论是，幼虫饥饿死亡率有很高的潜力，以促进招聘的变化，在波罗的海鳕鱼。
Besides variable egg survival, previous studies suggested that the larval stage may be the most critical phase in determining Baltic cod recruitment variability, and that larvae need to conduct an ontogenetic vertical migration from hatching depths (>50m) to upper layers with increased food availability in order to initiate first feeding, improve their nutritional condition and growth, and avoid starvation. Recently, detailed information on the stage-resolved vertical distribution of main Baltic copepod species, including the preferred larval Baltic cod prey species Pseudocalanus acuspes, has become available. Therefore, the vertical distribution of Baltic cod larvae in August 2007 and their depth-dependent nutritional condition and growth were investigated. RNA–DNA based methods were used to estimate growth, including a novel approach to estimate growth performance by relating observed specific growth rates (SGR) of field caught larvae to temperature-dependent reference growth rates (Gref) for fast-growing laboratory reared fish from the literature. This standardization to Grefwas found to have a great potential to improve investigations on the growth and ecology of larval fish. The need for early larvae to migrate to shallower layers was corroborated, while larger size classes were found at increasingly greater depths. This may reflect a continuation of the ontogenetic vertical migration in order to follow increasingly larger prey items at greater depths and to save energy in cooler waters below the thermocline. Larval growth generally declined with increasing depth, but the decline in growth became less pronounced in larger size classes. This indicates that larger larvae were better in coping with the ambient environment and the available prey field at greater depths. Generally, Baltic cod larvae grew poorly compared to larvae from other studies, which is discussed in relation to differences in predation and a possible food–temperature trade-off for larvae in the highly stratified Baltic Sea. Comparison with earlier results showed a higher frequency of starving larvae and lower frequencies of larger larvae after the first-feeding stage in 1994 and 1995. As this was a period of low Baltic cod recruitment despite favourable conditions for egg survival, it is concluded that larval starvation mortality has a high potential to contribute to recruitment variability in Baltic cod.
影响因子：
2.7
作者：
Caldarone, Elaine M.;Clemmesen, Catriona M.;Suthers, Iain M.
通讯作者：
Suthers, Iain M.
影响因子：
11.6
作者：
Moellmann, Christian;Diekmann, Rabea;Axe, Philip
通讯作者：
Axe, Philip