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首页> 外文期刊>ICES Journal of Marine Science >Survival and dispersal variability of pelagic eggs and yolk-sac larvae of central and eastern baltic flounder (Platichthys flesus): application of biophysical models
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Survival and dispersal variability of pelagic eggs and yolk-sac larvae of central and eastern baltic flounder (Platichthys flesus): application of biophysical models

机译：中东部波罗的海比目鱼（Platichthys flesus）中上层卵和卵黄囊幼虫的存活和扩散变异：生物物理模型的应用

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摘要

A hydrodynamic model coupled with a Lagrangian particle tracking technique was utilized to simulate spatially and temporally resolved long-term environmentally related (i) size of habitat suitable for reproduction, (ii) egg/yolk-sac larval survival, (iii) separation of causes of mortality, and (iv) connectivity between spawning areas of Baltic flounder with pelagic eggs. Information on reproduction habitat requirements and mortality sources were obtained from field or laboratory studies. In our modelling study we only quantified physical processes generating heterogeneity in spatial distribution of eggs and yolk-sac larvae, as e.g. predation is not accounted for. The spatial extent of eggs and larvae represented as modelled particles is primarily determined by oxygen and salinity conditions. The reproduction habitat most suitable was determined for the Gdansk Deep, followed by the Bornholm Basin. Relatively low habitat suitability was obtained for the Arkona Basin and the Gotland Basin. The model runs also showed yolk-sac larval survival to be to a large extent affected by sedimentation. Eggs initially released in the Arkona Basin and Bornholm Basin are strongly affected by sedimentation compared with those released in the Gdansk Deep and Gotland Basin. Highest relative survival of eggs occurred in the Gdansk Deep and in the Bornholm Basin. Relatively low survival rates in the Gotland Basin were attributable to oxygen-dependent mortality. Oxygen content had almost no impact on survival in the Arkona Basin. For all spawning areas mortality caused by lethally low temperatures was only evident after severe winters. Buoyancy of eggs and yolk-sac larvae in relation to topographic features appear as a barrier for the transport of eggs and yolk-sac larvae and potentially limits the connectivity of early life stages between the different spawning areas.
机译：结合拉格朗日粒子跟踪技术的水动力模型被用来模拟时空上长期解决的与环境相关的（i）适于繁殖的栖息地大小，（ii）卵/卵黄囊幼虫的存活，（iii）原因分离死亡率，以及（iv）波罗的海比目鱼产卵区与浮游卵之间的连通性。有关繁殖栖息地需求和死亡率来源的信息可从田间或实验室研究中获得。在我们的建模研究中，我们仅量化了在卵和卵黄囊幼虫的空间分布中产生异质性的物理过程，例如掠夺不占。代表模型颗粒的卵和幼虫的空间范围主要由氧气和盐度条件决定。确定最合适的繁殖生境为格但斯克深渊，其次为博恩霍尔姆盆地。阿科纳盆地和哥特兰盆地的生境适应性较低。模型运行还显示卵黄囊幼虫的存活在很大程度上受沉积影响。与在格但斯克深部和哥得兰盆地中释放的卵相比，最初在阿科纳盆地和博恩霍尔姆盆地中释放的卵受沉积的影响很大。鸡蛋的相对存活率最高，发生在格但斯克深部和博恩霍尔姆盆地。哥特兰盆地的相对较低的生存率归因于氧气依赖性死亡率。氧气含量对阿科纳盆地的生存几乎没有影响。在所有产卵地区，致命的低温造成的死亡只有在严冬之后才明显。卵和卵黄囊幼虫相对于地形特征的浮力似乎是卵和卵黄囊幼虫运输的障碍，并有可能限制不同产卵区域早期生命阶段的连通性。

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