Recruitment of Baltic cod and sprat stocks: identification of critical life stages and incorporation of environmental variability into stock-recruitment relationships*
Recruitment of Baltic cod and sprat stocks: identification of critical life stages and incorporation of environmental variability into stock-recruitment relationships*
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波罗的海鳕鱼和鲱鱼种群的招募：确定关键生命阶段并将环境变化纳入种群招募关系*
DOI：
10.3989/scimar.2003.67s1129
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发表时间：
2003
期刊：
影响因子：
1.4
通讯作者：
E. Aro
中科院分区：
文献类型：
--
作者：
F. Köster;H. Hinrichsen;D. Schnack;M. John;B. MacKenzie;J. Tomkiewicz;C. Möllmann;G. Kraus;M. Plikshs;A. Makarchouk;E. Aro
波罗的海鳕鱼和鲱鱼的招聘过程进行了分析，并确定了关键时期的主要影响因素对个人的早期生活史阶段分别和相关的连续阶段之间的观测丰度数据。对于鳕鱼，招聘似乎是依赖于鸡蛋的生存，与居住深度和捕食的主要原因是卵死亡率与低氧浓度。幸存的鸡蛋生产和幼虫丰度弱相关，而幼虫丰度显着相关的年级强度。这表明后期卵和早期幼虫阶段之间的时期是鳕鱼补充的关键。一个潜在的变量确定影响这个生命阶段是猎物的幼虫。对于鲱鱼，早期和晚期的卵期生产以及晚期的卵期生产和幼虫丰度显着相关。不过，年级实力的提升，在很大程度上与幼虫数量无关。因此，后期幼虫和早期少年阶段之间的时期似乎是至关重要的幼鱼招聘。确定影响这一生命阶段的潜在变量是环境温度和风应力。环境因素显示统计上显着的协方差与这些关键的生命阶段之一的生存被纳入单独的产卵区和波罗的海中部相结合的股票招聘模型。
The recruitment processes of Baltic cod and sprat were analysed and critical periods were identified by addressing the major impact factors on individual early life history stages separately and relating observed abundance data between successive stages. For cod, recruitment appeared to be dependent on egg survival, with low oxygen concentration in dwelling depths and predation by clupeids as the major causes for egg mortality. Surviving egg production and larval abundance were weakly correlated, whereas larval abundance was significantly related to year class strength. This indicated that the period between the late egg and the early larval stage is critical for cod recruitment. A potential variable identified to affect this life stage was prey availability for larvae. For sprat, early and late egg stage production as well as late egg stage production and larval abundance were significantly related. However, year class strength was largely independent of larval abundance. Thus, the period between the late larval and early juvenile stage appeared to be critical for sprat recruitment. Potential variables identified to affect this life stage were ambient temperature and wind stress. Environmental factors showing statistically significant covariance with the survival of one of these critical life stages were incorporated into stock-recruitment models for individual spawning areas separately and for the Central Baltic combined.