Does predation control the diapausing stock of Calanus finmarchicus in the Gulf of Maine?

Does predation control the diapausing stock of Calanus finmarchicus in the Gulf of Maine?
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捕食是否控制了缅因湾的Finmarchicus 滞育种群?

DOI:
10.1016/j.pocean.2022.102861
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发表时间:
2022
影响因子:
4.1
通讯作者:
Greene, C.H.
Greene, C.H.
中科院分区:
地球科学1区
文献类型:
--
作者:
Wiebe, P.H.;Baumgartner, M.F.;Copley, N.J.;Lawson, G.L.;Davis, C.;Ji, R.;Greene, C.H.

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浮游动物种群的变化受外部和内部强迫的控制,前者主要是大规模的环流变化,后者主要是由原地生长、竞争和捕食驱动。评估这些强迫的相对重要性具有挑战性,需要对多方面的观测数据进行分析。作为美国GLOBEC Georges Bank项目的一部分,在1997年、1998年和1999年的秋天进行了一系列的巡游,以调查约旦威尔金森和缅因湾乔治盆地的金龟和它们的捕食者的滞育种群。利用网络(1 m2moness)和生物声学(BIOMAPER-II)系统分别进行站内采样和海上采样,获取浮游动物生物量、分类学、大小和生命阶段组成的垂直分层数据以及相关环境数据。结果表明:秋季滞育c。1998年的浮游动物丰度远低于1997年或1999年,尽管这三年的浮游动物总生物量水平相当。滞育个体的大小频率分布在1997年和1999年呈双模态分布,但在1998年呈单模态分布,表明滞育种群的早期群体已经消亡。1998年发现潜在的无脊椎捕食者(栉水母类、十足类、水母类和管水母类)的相对生物量和计算能量需求更高,这可能是c缺失的原因。finmarchicuscohort。本研究收集的证据支持了当地捕食有可能控制c滞育种群的假设。缅因湾的finmarchicusn。
The variability of zooplankton populations is controlled by external and internal forcing, with the former being principally large-scale changes in circulation, and the latter being driven by in situ growth, competition, and predation. Assessing the relative importance of these forcings is challenging and requires analyses of multifaceted observational data. As part of the U.S. GLOBEC Georges Bank program, a series of cruises were conducted in fall 1997, 1998, and 1999 to survey diapausing populations ofCalanus finmarchicusand their predators in Wilkinson, Jordan, and Georges Basins of the Gulf of Maine. Station and underway sampling were conducted using net (1 m2MOCNESS) and bioacoustic (BIOMAPER-II) systems, respectively, to acquire vertically stratified data for zooplankton biomass, taxonomic, size, and life-stage composition, together with associated environmental data. The results show that the autumn diapausingC. finmarchicusabundance was much lower in 1998 than in 1997 or 1999, even though the overall zooplankton biomass levels were comparable between the three years. The size frequency distribution of the diapausing individuals had a bi-modal pattern in 1997 and 1999, but a single mode in 1998, indicating the demise of an early cohort of the diapausing stock. The relative biomass and computed energy demand of potential invertebrate predators (euphausiids, decapods, medusae, and siphonophores) was found to be higher in 1998 and could account for the missingC. finmarchicuscohort. Evidence collected from this study supports the hypothesis that local predation has the potential to control the diapausing stock ofC. finmarchicusin the Gulf of Maine.
确定混合浮游动物种群中声音的主要散射体。
DOI: --
发表时间: 2007
影响因子: 2.4
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