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首页> 外文期刊>ICES Journal of Marine Science >Plasticity in dormancy behaviour of Calanoides acutus in Antarctic coastal waters
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Plasticity in dormancy behaviour of Calanoides acutus in Antarctic coastal waters

机译：南极沿海水域含钙穴位休眠行为的可塑性

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摘要

Copepods that enter dormancy, such as Calanoides acutus, are key primary consumers in Southern Ocean food webs where they convert a portion of the seasonal phytoplankton biomass into a longer-term energetic and physiological resource as wax ester (WE) reserves. We studied the seasonal abundance and lipid profiles of pre-adult and adult C. acutus in relation to phytoplankton dynamics on the Western Antarctic Peninsula. Initiation of dormancy occurred when WE unsaturation was relatively high, and chlorophyll a (Chl a) concentrations, predominantly attributable to diatoms, were reducing. Declines in WE unsaturation during the winter may act as a dormancy timing mechanism with increased Chl a concentrations likely to promote sedimentation that results in a teleconnection between the surface and deep water inducing ascent. A late summer diatom bloom was linked to early dormancy termination of females and a second spawning event. The frequency and duration of high biomass phytoplankton blooms may have consequences for the lifespan of the iteroparous C. acutus females (either 1 or 2 years) if limited by a total of two main spawning events. Late summer recruits, generated by a second spawning event, likely benefitted from lower predation and high phytoplankton food availability. The flexibility of copepods to modulate their life-cycle strategy in response to bottom-up and top-down conditions enables individuals to optimize their probability of reproductive success in the very variable environment prevalent in the Southern Ocean.
机译：进入休眠的蛋白酶，例如Calanoides Acutus，是南海食品网中的主要初级消费者，在那里他们将一部分季节性浮游植物生物量转化为蜡酯（我们）储备的长期能量和生理资源。我们研究了成人前和成人C. Acutus的季节性丰度和脂质曲线，与西南极半岛的Phytoplancton Dynamics相关。当我们不饱和相对较高时，发生休眠的启动，并且主要归因于硅藻的叶绿素A（CHL A）浓度降低。我们在冬季不饱和的衰退可能充当休眠定时机制，增加了CHL的浓度，可能促进沉降，导致表面和深水之间的助扣啮合。夏季深夏天盛开与女性的早期休眠终止和第二个产卵活动有关。高生物量浮游植物盛开的频率和持续时间可能对迭代C.古氏菌族的寿命（1或2年）有限制，如果总共有两个主要的产卵事件。夏季新兵，由第二个产卵事件产生，可能受益于较低的捕食和高浮游植物的食物可用性。 CopePods以响应自下而上和自然条件调节其生命周期策略的灵活性使个人能够优化它们在南海普遍的变化环境中的生殖成功的概率。

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  • 来源
    《ICES Journal of Marine Science》 |2020年第5期|1738-1751|共14页
  • 作者

    Biggs Tristan E. G.; Brussaard Corina P. D.; Evans Claire; Venables Hugh J.; Pond David W.;

  • 作者单位

    Univ Utrecht NIOZ Royal Netherlands Inst Sea Res Dept Marine Microbiol & Biogeochem Texel Netherlands|Univ Amsterdam Inst Biodivers & Ecosyst Dynam IBED Dept Freshwater & Marine Ecol Amsterdam Netherlands;

    Univ Utrecht NIOZ Royal Netherlands Inst Sea Res Dept Marine Microbiol & Biogeochem Texel Netherlands|Univ Amsterdam Inst Biodivers & Ecosyst Dynam IBED Dept Freshwater & Marine Ecol Amsterdam Netherlands;

    Natl Oceanog Ctr Ocean Biogeochem & Ecosyst Res Grp Southampton Hants England;

    NERC British Antarctic Survey Cambridge England;

    Univ Stirling Inst Aquaculture Stirling Scotland;

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  • 正文语种 eng
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  • 关键词

    copepod; dormancy; life cycle; lipids; phytoplankton; wax ester unsaturation;

    机译：Copepod;休眠;生命周期;脂质;Phytoplankton;蜡酯不饱和度;

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