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Variation in the distribution of yellowfin sole Limanda aspera larvae in warm and cold years in the eastern Bering Sea
Fisheries Oceanography ( IF 2.6 ) Pub Date : 2021-09-20 , DOI: 10.1111/fog.12565
Steven M. Porter 1
Affiliation  

Multiyear periods of relatively cold temperatures (2007–2013) and warm temperatures (2001–2005 and 2014–2018) altered the eastern Bering Sea ecosystem, affecting ocean currents and wind patterns, plankton community, and spatial distribution of fishes. Yellowfin sole Limanda aspera larvae were collected from the inner domain (≤50 m depth) of the eastern Bering Sea among four warm years (2002, 2004, 2005, 2016), an average year (2006), and three cold years (2007, 2010, 2012). Spatial distribution and density of larvae among those years was analyzed using generalized additive models that included timing of sea-ice retreat, areal coverage of water ≤0°C, and water temperature as covariates. Analyses indicated a combination of temperature effects on the location and timing of spawning, and on egg and larval survival, may explain the variation in larval density and distribution among years. During warm years, higher density and wider spatial distribution of larvae may be due to earlier spawning, an expansion of the spawning area, and higher egg and larvae survival due to favorable temperatures. Larval distribution contracted shoreward, and density was lower during cold conditions and was likely due to fish spawning closer to shore to remain in preferred temperatures, later spawning, and increased mortality. Predicted drift trajectories from spawning areas showed that larvae would reach nursery grounds in most years. Years when the drift period was longer than the pelagic phase of the larvae occurred during both warm and cold conditions indicating that settlement outside of nursery areas could happen during either temperature condition.

中文翻译:

东白令海暖年和冷年黄鳍鳐鱼幼虫分布的变化

多年相对寒冷的温度(2007-2013)和温暖的温度(2001-2005 和 2014-2018)改变了白令海东部的生态系统,影响了洋流和风模式、浮游生物群落和鱼类的空间分布。黄鳍鲆 Limanda aspera幼虫采集于白令海东部内域(≤50 m深度)的4个暖年(2002、2004、2005、2016)、平年(2006)和3个冷年(2007、2010、2012) . 使用广义可加模型分析这些年份中幼虫的空间分布和密度,该模型包括海冰退缩的时间、≤0°C 的水域覆盖率和水温作为协变量。分析表明,温度对产卵地点和时间以及卵和幼虫存活率的综合影响可以解释幼虫密度和分布在年份之间的变化。在温暖的年份,由于产卵较早,产卵面积扩大,以及由于有利的温度,卵和幼虫的存活率更高,因此幼虫密度更高,空间分布更广。幼虫分布向岸边收缩,在寒冷条件下密度较低,这可能是由于鱼类在靠近岸边产卵以保持首选温度、产卵较晚和死亡率增加。来自产卵区的预测漂移轨迹表明,幼虫在大多数年份都会到达育苗地。在温暖和寒冷条件下发生的漂流期长于幼虫的远洋阶段的年份表明在任何一种温度条件下都可能发生在育苗区外的沉降。
更新日期:2021-09-20
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