A length-based hypothesis for feeding migrations in pelagic fish
A length-based hypothesis for feeding migrations in pelagic fish
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基于长度的中上层鱼类摄食迁徙假设
DOI：
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发表时间：
1999
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通讯作者：
G. Huse
中科院分区：
文献类型：
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作者：
L. Nøttestad;J. Giske;J. Holst;G. Huse
我们使用数值模型评估了挪威和巴伦支海中上层浮游动物、大西洋鲱鱼 (Clupea harengus)、蓝鳕鱼 (Micromesistius poutassou)、鲭鱼 (Scomber scombrus) 和毛鳞鱼 (Mallotus villosus) 长距离水平洄游的成本和收益，并根据现场观测测试了模型预测。具体来说，我们考虑了（i）能量成本作为身体大小、水流、游泳速度和距离的函数，（ii）时间成本作为速度和距离的函数，以及（iii）根据区域之间食物摄入差异的能量增益。该模型展示了体型如何限制大规模水平迁移模式。模型和现场结果表明，迁移的程度将随着体长的增加而增加。该模型预测，由于鱼体尺寸减小，水动力阻力增加，长距离洄游成本可能超过 <20 厘米的鱼的能量摄入。实地结果表明，迁徙距离是长度、重量和年龄的函数。食物丰度和分布、海流速度和方向以及北半球纬度的日长差异被认为是影响远洋浮游动物大规模迁徙距离、方向和时间的主要驱动力。向北纬度而非纵向摄食迁徙的原因是随着日照长度的增加，摄食机会有所改善。简历 : 我们评估水平迁徙的优势和优势，了解浮游植物的长距离、哈伦 (Clupea harengus)、蓝色梅兰 (Micromesistius poutassou)、马奎罗 (Le maquereau) 的技能
We evaluated the costs and benefits of long-distance horizontal migration by pelagic planktivores, Atlantic herring (Clupea harengus), blue whiting (Micromesistius poutassou), mackerel (Scomber scombrus), and capelin (Mallotus villosus) in the Norwegian and Barents seas using a numerical model and tested model predictions against field observations. Specifically, we considered ( i) energetic costs as a function of body size, water currents, swimming speed, and distance, (ii) time costs as a function of speed and distance, and (iii) energetic gain in terms of differences in food intake between areas. The model demonstrates how body size restricts large-scale horizontal migration patterns. Model and field results suggest that the extent of migration will increase with increasing body length. The model predicts that long-distance migration costs may exceed energy intake for fish <20 cm, due to increased hydrodynamical drag with decreasing fish size. Field results suggest that migration distance is a function of length, weight, and age. Food abundance and distribution, current speed and direction, and differences in day length at boreal latitudes are believed to be the major driving forces influencing large-scale migration distance, direction, and timing in pelagic planktivores. Northwards latitudinal rather than longitudinal feeding migrations are explained by the improved feeding opportunities with increased day lengths. Resume : Nous avons evalue les couts et les avantages de la migration horizontale a longue distance de poissons pelagiques planctivores, a savoir le hareng (Clupea harengus), le merlan bleu (Micromesistius poutassou), le maquereau