Environmental characteristics of spawning and nursery grounds of Japanese sardine and mackerels in the Kuroshio and Kuroshio Extension area
Environmental characteristics of spawning and nursery grounds of Japanese sardine and mackerels in the Kuroshio and Kuroshio Extension area
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DOI：
10.1111/fog.12423
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发表时间：
2019-07
影响因子：
2.6
通讯作者：
S. Sogawa;K. Hidaka;Y. Kamimura;M. Takahashi;H. Saito;Y. Okazaki;Y. Shimizu;T. Setou
中科院分区：
文献类型：
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作者：
S. Sogawa;K. Hidaka;Y. Kamimura;M. Takahashi;H. Saito;Y. Okazaki;Y. Shimizu;T. Setou
海洋资源的可持续利用需要了解周围的生态系统并阐明变化的机制。然而，我们仍然缺乏对西北太平洋重要渔业物种日本沙丁鱼（Sardinops melanostictus）和鲭鱼（Scomber japonicus和Scomber australasicus）产卵场和育苗场环境变化的全面了解。在这里，我们调查了详细的物理，化学和生物环境的变化，在产卵场和育苗场沿着黑潮和黑潮延伸区在2013年4月的密集调查。我们发现，在黑潮卵丰富区和黑潮延伸区下游的幼虫丰富区，水团性质和桡足类群落相似，表明在运输和发展过程中，环境变化很小。富含卵的北方伊豆群岛地区表现出较高的桡足类丰度，尽管观察到较低的营养和叶绿素浓度。在第二次调查中，由于水体性质和桡足类群落结构的差异，沿着出现了大量的鱼卵，但在第二次调查中，鱼卵出现了稀少或缺失的现象。这表明，不仅位置，而且特定的水特性和桡足类群落是产卵的决定因素。研究中发现的桡足类指示群落（黑潮延伸区的产卵场、非产卵场和繁殖区的迁移过程指示群落）将是补充预测的关键因素。
The sustainable use of marine resources requires understanding the surrounding ecosystem and elucidating mechanisms of variation. However, we still lack a comprehensive understanding of environmental variation in the spawning and nursery grounds of important fisheries species Japanese sardine (Sardinops melanostictus) and mackerels (Scomber japonicusandScomber australasicus) in the northwest Pacific. Here, we investigate detailed physical, chemical, and biological environment variations in the spawning and nursery grounds along the Kuroshio and Kuroshio Extension area from intensive investigation in spawning season (April) of 2013. We found similar water mass property and copepod community in the egg‐rich Kuroshio area and the larvae‐rich downstream Kuroshio Extension area, indicating environmental variability is small during transportation and development processes. The egg‐rich northern Izu Islands region showed high copepod abundance, although low nutrient and chlorophyll concentrations were observed. Eggs were scarce or absent in the second survey 10 days after abundant eggs were observed in the region, along with differences in water property and copepod community. This indicates that not only the location but also the specific water characteristic and copepod community are a determining factor for spawning. Indicator communities of copepod found in our study (indicator community of transportation process from spawning ground, of non‐spawning ground, and of reproductive area in the Kuroshio Extension area) would be a key factor for recruitment prediction.