Dependency of larval fish survival on retention/dispersion in food limited environments: the Baltic Sea as a case study
Dependency of larval fish survival on retention/dispersion in food limited environments: the Baltic Sea as a case study
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幼鱼生存对食物有限环境中保留/分散的依赖性：以波罗的海为例
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
Jörn O Schmidt
中科院分区：
文献类型：
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作者：
H. Hinrichsen;A. Lehmann;C. Möllmann;Jörn O Schmidt
一个三维流体动力学模型已被用来分析时间和空间分辨的流通模式在波罗的海，特别强调漂流颗粒代表的幼鱼。这项研究的主要目的是（一）调查潜在的漂移模式的仔鱼，（二）以确定其内部和跨年度的变化的时间周期的基础上的产卵时间和（三）分析其季节性和空间变异的依赖大气强迫条件。对于时间段1979-1998年的时间和空间分辨模拟流场被用来描述潜在的漂移从波罗的海鳕鱼（Gadus morhua）的主要繁殖努力的中心。模型运行的结果表明，环流模式总体上发生了变化，从第一个十年（1979-1988年）的保留到下一个十年（1989-1998年）的分散。分散度的增加与波罗的海上空当地风强迫条件的变异性增加有关。更频繁地发生在最近十年的春季分散是伴随着一个强大的衰减生物量的主要仔鱼摄食组件在中央盆地，哲水蚤桡足类Pseudocalanus elongatus。这种猎物生物体的较大分散可能会影响空间重叠，从而影响捕食者和猎物之间的接触率。因此，这可能导致了食物限制的早期生活阶段的波罗的海鳕鱼，并可能导致鳕鱼产卵高峰时间从春季到夏末的显着转变。早期生活阶段的鳕鱼起源于晚产卵的鱼，受益于一个较强的分散在夏末和秋季，到浅水沿海地区具有较高的哲水蚤丰度。
A three-dimensional hydrodynamic model has been used to analyse temporally and spatially resolved circulation patterns in the Baltic Sea with special emphasis on drifting particles representing larval fish. The main purpose of this study was (i) to investigate potential drift patterns of larval fish, (ii) to identify its intra- and inter-annual variability for time periods based on the timing of spawning and (iii) to analyse its seasonal and spatial variability in dependence of the atmospheric forcing conditions. For the time period 1979–1998 temporally and spatially resolved simulated flow fields were used to describe the potential drift from the centre of main reproductive effort of Baltic cod (Gadus morhua). The results of the model runs demonstrate a general change in circulation pattern from retention during a first decade (1979–1988) to dispersion in the following decade (1989–1998). This increase in dispersion was related to an increase in the variability of the local wind forcing conditions over the Baltic. The more frequent occurrence of dispersion in spring of the recent decade was accompanied by a strong decay in biomass of one of the main larval fish feeding component in the central basin, the calanoid copepod Pseudocalanus elongatus. Larger dispersion of this prey organism may have affected the spatial overlap and thus the contact rates between predator and prey. Hence, this may have resulted in a food limitation for early life stages of Baltic cod and potentially contributed to the pronounced shift in cod peak spawning time from spring to late summer. Early life stages of cod originating from late spawning fish, benefited from a stronger dispersion in late summer and autumn, into shallow coastal areas with higher calanoid abundance.