Seasonal phenology of four dominant copepods in the Pacific sector of the Arctic Ocean: Insights from statistical analyses of sediment trap data
Seasonal phenology of four dominant copepods in the Pacific sector of the Arctic Ocean: Insights from statistical analyses of sediment trap data
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DOI：
10.1016/j.polar.2018.08.006
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发表时间：
2019-03
期刊：
影响因子：
1.8
通讯作者：
Koki Tokuhiro;Yoshiyuki Abe;K. Matsuno;Jonaotaro Onodera;A. Fujiwara;N. Harada;T. Hirawake;A. Yamaguchi
中科院分区：
文献类型：
--
作者：
Koki Tokuhiro;Yoshiyuki Abe;K. Matsuno;Jonaotaro Onodera;A. Fujiwara;N. Harada;T. Hirawake;A. Yamaguchi
近年来，由于北冰洋海冰急剧减少，海洋生态系统发生了变化，但桡足类物候与环境驱动因素之间的关系尚不清楚。为了揭示这种关系，利用2010年10月至2013年9月部署在太平洋-北极区222m深度的沉积物陷阱，研究了四种优势桡足类（Calanus hyperboreus、Metridia longa、Paraeuchaeta glacialis和Heterorhabdusnorvegicus）通量（游泳者数量）、种群结构、脂质积累和性腺成熟的季节变化。 hyperboreus，主要由桡足类第 6 阶段雌性 (C6F) 组成，在春季和秋季表现出几个通量高峰。 hyperboreusC6F 全年以富含脂质的样本为主，并且在 2 月至 4 月期间在这些样本中观察到性腺发育。他们。 longaflux没有表现出明显的季节性。 M.性腺成熟longaC6Fs 发生于 2 月至 9 月。 glacialisflux 在 2011 年和 2012 年秋季表现出两个峰值。与前两个物种相比，富含脂质、成熟的P. glacialisC6Fs全年发生。H. Norvegicuscopepodid 6 期雄性 (C6Ms) 也全年发生，可能是因为 H.即使在 C6Ms 中，褐藻也具有功能性摄食附属器。根据广义加性模型，C.海珀伯勒斯，M.龙加和P。 glacialis 显示与白天长度和/或海冰浓度的关系，但关系模式不同。这些发现表明，对环境参数的响应（例如垂直迁移）可能因物种而异，海冰的急剧减少可能会影响太平洋-北极地区的桡足类物候。
In recent years, marine ecosystems have changed due to the drastic sea ice reduction in the Arctic Ocean, but the relationship between copepod phenology and environmental drivers is unclear. To reveal the relationship, seasonal changes in the flux (abundance of swimmers), population structure, lipid accumulation and gonad maturation of four dominant copepods (Calanus hyperboreus,Metridia longa,Paraeuchaeta glacialisandHeterorhabdus norvegicus) were studied using a sediment trap deployed at a depth of 222 m in the Pacific-Arctic sector from October 2010 to September 2013.C. hyperboreus, mostly comprising copepodid stage 6 females (C6F), exhibited several peaks in flux in spring and autumn.C. hyperboreusC6Fs were dominated by lipid-rich specimens year-round, and gonad development was observed in these samples from February to April. TheM. longaflux showed no clear seasonality. Gonad maturation ofM. longaC6Fs occurred from February to September.P. glacialisflux exhibited two peaks in autumn of 2011 and 2012. In contrast to the former two species, lipid-rich, matureP. glacialisC6Fs occurred year-round.H. norvegicuscopepodid stage 6 males (C6Ms) also occurred throughout the year, likely becauseH. norvegicushas functional feeding appendages, even in C6Ms. From generalized additive models,C. hyperboreus,M. longaandP. glacialisshowed relationships with daytime length and/or sea ice concentrations, but the relationship patterns were different. These findings suggest that the response (e.g., vertical migration) to the environmental parameters could vary with species and the drastic sea ice reductions may affect the copepod phenology in the Pacific-Arctic sector.