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Temporal fluctuations in abundance and size of the giant jellyfish Nemopilema nomurai medusae in the northern East China Sea, 2006-2017

机译:2006 - 2017年北部巨型水母Nemopilema南景梅杜斯的丰富和大小的时间波动

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摘要

The abundance and size of the giant jellyfish (Nemopilema nomurai) medusae collected by midwater trawl from 2006 to 2017 in the northern East China Sea (nECS) were investigated. While absent in 2008 and 2011, in other years, medusae were prevalent in June and July, rare in October, and not found from January to May. This seasonality in medusa abundance might be related to the life cycle characteristics of this species, with strobilation occurring near Chinese coast of the nECS from late March to early June but medusae dispersing in oceanic currents or dying by early autumn. Peak abundances in June and July varied from 0 to 62.1 x 10(6) medusa m(-2) in the repeatedly observed area (30 degrees 30 ' N-31 degrees N, 124 degrees 15 ' E-126 degrees E). These annual fluctuations in medusae abundance in the nECS roughly coincide with patterns in the Sea of Japan (JS) in the autumn, which suggests that monitoring in nECS would be effective in predicting the occurrence of this species in the JS which undergoes massive occurrences of this species. The medusae sizes were comparable in June, but smaller in 2006, 2007, 2009, and 2010 than that in 2012-2017 in July. Hence, the existence of a large annual variation in the size of N. nomurai even in the same area and period was indicated.
机译:调查了巨型水母(Nemopilema Nomurai)Medumater的丰富和大小由2006年至2017年在东海北海(NECS)中收集。虽然2008年和2011年缺席,但在其他几年,Medusae于6月和7月普遍存在,10月份罕见,从1月份没有找到。梅杜萨丰富的这种季节性可能与该物种的生命周期特征有关,其中NEC的中国海岸靠近6月初的中国海岸发生的推动,但Medusae分散在海洋电流或早期死亡。 6月和7月的峰值丰度在反复观察区域(30度30'N-31℃,124度15'e-126 e)中的0到62.1 x 10(6)Medusa M(-2)变化。这些在NEC中的Medusae丰富的年度波动大致与日本海洋(JS)在秋季的模式恰到重合,这表明NEC的监测将有效预测经历大规模发生的JS中该物种的发生物种。 Medusae大小在6月份比较,但2006年,2007年,2009年和2010年的比较较小,而不是2012 - 2017年7月。因此,即使在同一地区和期间也存在N. Nomurai的大小的大小的年度变化的存在。

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  • 来源
    《Marine biology》 |2020年第6期|75.1-75.10|共10页
  • 作者单位

    Seikai Natl Fisheries Res Inst Japan Fisheries Res & Educ Agcy Taira Machi Nagasaki 8512213 Japan;

    Seikai Natl Fisheries Res Inst Japan Fisheries Res & Educ Agcy Taira Machi Nagasaki 8512213 Japan;

    Seikai Natl Fisheries Res Inst Japan Fisheries Res & Educ Agcy Taira Machi Nagasaki 8512213 Japan;

    Seikai Natl Fisheries Res Inst Japan Fisheries Res & Educ Agcy Taira Machi Nagasaki 8512213 Japan;

    Seikai Natl Fisheries Res Inst Japan Fisheries Res & Educ Agcy Taira Machi Nagasaki 8512213 Japan;

    Seikai Natl Fisheries Res Inst Japan Fisheries Res & Educ Agcy Taira Machi Nagasaki 8512213 Japan;

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