Between-year comparison of interactions between environmental parameters and various plankton stocks in the northern Bering Sea during the summers of 2017 and 2018

Between-year comparison of interactions between environmental parameters and various plankton stocks in the northern Bering Sea during the summers of 2017 and 2018
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2017年和2018年夏季白令海北部环境参数与各种浮游生物种群相互作用的年际比较

DOI:
10.1016/j.polar.2020.100555
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发表时间:
2021
期刊:
影响因子:
1.8
通讯作者:
Hirawake Toru
Hirawake Toru
中科院分区:
地球科学4区
文献类型:
--
作者:
Yamaguchi Atsushi;Kimura Fumihiko;Fukai Yuri;Abe Yoshiyuki;Matsuno Kohei;Ooki Atsushi;Hirawake Toru

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2017-2018年冬季,白令海北部冰盖覆盖面积较低,退缩时间较早。为了评估这些异常冰条件的影响,我们量化了2017年7月和2018年7月的各种环境参数(温度、盐度、混合层深度、营养物质)和各种浮游生物分类群的常绿种群(浮游植物数量、中、大型浮游动物数量、水母丰度)。每年,通过结构方程模型(SEM)分析评估各参数之间的相互作用。环境参数与浮游生物种群之间的相互作用存在较大的年际差异。因此,2017年,环境参数与各种浮游生物种群之间共存在15种相互作用。然而,在2018年,只有8次互动。在这些互动中,有四个是两年内共同的。值得注意的是,2018年这四种相互作用的路径系数均低于2017年。这些发现表明,2018年浮游植物华流的小幅度和短脉冲可能未能将生产和能量转移到更高的营养水平,即使在浮游食物网内也是如此。事实上,据报道,2018年,以浮游鱼类为食的海鸟(两种海鸟)大量死亡。
In the northern Bering Sea, ice coverage and retreat timing were low and early, respectively, in the 2017–2018 winter. To evaluate the effect of these anomalous ice conditions, we quantified various environmental parameters (temperature, salinity, mixed-layer depth, nutrients) and the standing stocks of various planktonic taxa (phytoplankton counts, meso- and macrozooplankton mass, jellyfish abundance) during July of 2017 and 2018. For each year, the interaction between each parameter was evaluated by structural equation modelling (SEM) analysis. Large yearly differences were detected for the interactions between environmental parameters and planktonic stocks. Thus, for 2017, a total of fifteen interactions were present between environmental parameters and various planktonic stocks. In 2018, however, only eight interactions were present. Among the interactions, four were common to the two years. It is notable that the path coefficients of these four interactions were all lower in 2018 than in 2017. These findings suggest that the small magnitude and short pulse of the phytoplankton bloom in 2018 may have failed to transfer production and energy to a higher trophic level even within the planktonic food web. Indeed, in 2018, mass mortality was reported for seabirds (two murre species) feeding on planktivorous fishes.
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