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首页> 外文期刊>ICES Journal of Marine Science >Effects of prey concentration, light regime, and parental origin on growth and survival of herring larvae under controlled experimental conditions
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Effects of prey concentration, light regime, and parental origin on growth and survival of herring larvae under controlled experimental conditions

机译:在受控实验条件下,猎物浓度,光照方式和父母本源对鲱鱼幼虫生长和存活的影响

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摘要

Experiments were undertaken to study the combined effects of environmental (prey concentration and photoperiod) and genetic (parental spawning season) factors on growth and survival of herring larvae. During the experimental period, constant prey concentrations were maintained at one of the two nominal levels, under either a spring or an autumn light regime. Eggs of one autumn-spawning North Sea Buchan female herring were fertilized either with cryopreserved sperm from three Norwegian spring-spawning males or with fresh sperm from three Buchan males. Larvae of the two groups (the hybrids marked with alizarin) were mixed in replicated treatment tanks, thus ensuring identical environmental conditions. Mean larval growth rates were mostly influenced by food availability, but the hybrids grew significantly faster than the pure autumn-spawned offspring. In addition, the hybrids experienced a survival advantage at low prey concentrations. Hybrid survival was also somewhat better at high prey concentrations under a spring photoperiod than the corresponding group under an autumn photoperiod, suggesting a possible genetic adaptation to seasonal light conditions. The experiment documents the viability beyond first-feeding of offspring from parents with different spawning periods. The results are discussed in relation to herring metapopulation structure.
机译:进行实验研究环境因素(猎物浓度和光周期)和遗传因素(父母产卵季节)对鲱鱼幼虫生长和存活的综合影响。在实验期间,在春季或秋季光照条件下,恒定的猎物浓度保持在两个名义水平之一。用三只挪威春季产卵雄性的冷冻保存的精子或三只Buchan雄性的新鲜精子对一只秋季产卵的北海布肯雌性鲱鱼的卵进行受精。将两组的幼虫(带有茜素标记的杂种)在复制的处理池中混合,从而确保相同的环境条件。平均幼虫生长率主要受食物供应量的影响,但杂种的生长明显快于纯秋天产卵的后代。另外,杂种在低猎物浓度下具有生存优势。在春季光周期较高的猎物浓度下,杂种存活率也比秋季光周期较高的相应群体好一些,这表明遗传因素可能适应季节性光照条件。该实验证明了具有不同产卵期的父母的后代首次进食后的生存能力。讨论了有关鲱鱼种群结构的结果。

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