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首页> 外文期刊>Polar biology >Polar night ecology of a pelagic predator, the chaetognath Parasagitta elegans
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Polar night ecology of a pelagic predator, the chaetognath Parasagitta elegans

机译：中上层捕食者Chaetognath Parasagitta elegans的极夜生态

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摘要

The annual routines and seasonal ecology of herbivorous zooplankton species are relatively well known due to their tight coupling with their pulsed food source, the primary production. For higher trophic levels of plankton, these seasonal interactions are less well understood. Here, we study the mid-winter feeding of chaetog-naths in high-Arctic fjord ecosystems. Chaetognaths are planktivorous predators which comprise high biomass in high-latitude seas. We investigated the common species Parasagitta elegans around the Svalbard archipelago (78-81°N) during the winters of 2012 and 2013. Our samples consisted of individuals (body lengths 9-55 mm) from three fjords, which were examined for gut contents (n = 903), stable isotopes, fatty acid composition, and maturity status (n = 352). About a quarter of the individuals contained gut contents, mainly lipid droplets and chitinous debris, whilst only 4 % contained identifiable prey, chiefly the copepods Calanus spp. and Metridia longa. The δ~(15)N content of P. elegans, and its average trophic level of 2.9, confirmed its carnivorous position and its fatty acid profile [in particular its high levels of 20:1(n-9) and 22:1(n-11)] confirmed carnivory on Calanus. Observations of undeveloped gonads in many of the larger P. elegans, and the absence of small individuals ＜10 mm, suggested that reproduction had not started this early in the year. Its average feeding rate across fjords and years was 0.12 prey ind.~(-1) day~(-1), which is low compared to estimates of spring and summer feeding in high-latitude environments. Our findings suggest reduced feeding activity during winter and that predation by P. elegans had little impact on the mortality of copepods.
机译：食草性浮游动物的年度例行活动和季节性生态学相对众所周知，这是因为它们与它们的脉冲食物来源（初级生产）紧密结合。对于较高的浮游生物营养水平，人们对这些季节性相互作用的了解较少。在这里，我们研究了高北极峡湾生态系统中chaetog-nath的冬季中食。板嘴藻是浮游性的食肉动物，在高纬度海域中包含高生物量。我们在2012年和2013年冬季调查了斯瓦尔巴群岛（78-81°N）周围的常见线虫Parasagitta elegans。我们的样本包括来自三个峡湾的个体（体长9-55 mm），检查了肠道内容（ n = 903），稳定的同位素，脂肪酸组成和成熟状态（n = 352）。大约四分之一的人含有肠内容物，主要是脂滴和几丁质碎片，而只有4％的人含有可识别的猎物，主要是co足类Calanus spp。和Metridia longa。秀丽隐杆线虫的δ〜（15）N含量及其平均营养水平为2.9，证实了其肉食性和脂肪酸分布[特别是其高比例为20：1（n-9）和22：1（ n-11）]证实了卡努斯的食肉动物。在许多较大的秀丽隐杆线虫中未观察到性腺发育，并且没有小于10mm的小个体，这表明繁殖在这一年年初还没有开始。它在峡湾和多年中的平均摄食率是猎物ind。〜（-1）天〜（-1）的0.12，与高纬度环境中春季和夏季摄食的估计值相比较低。我们的发现表明，冬季进食活动减少，秀丽隐杆线虫的捕食对co足类动物的死亡率影响很小。

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  • 来源
    《Polar biology》 |2015年第1期|87-98|共12页
  • 作者

    Jordan J. Grigor; Ariane E. Marais; Stig Falk-Petersen; Oystein Varpe;

  • 作者单位

    Takuvik Joint International Laboratory, Universite Laval, Quebec, Canada,Quebec-Ocean, Universite Laval, Quebec, QC G1V 0A6, Canada,Departement de Biologie, Universite Laval, Quebec, QC G1V 0A6, Canada,University Centre in Svalbard, 9171 Longyearbyen, Norway;

    Departement de Biologie, Universite Laval, Quebec, QC G1V 0A6, Canada;

    Akvaplan-niva, Fram Centre, 9296 Tromso, Norway,Faculty of Biosciences, Fisheries and Economics, University of Tromso, 9037 Tromso, Norway;

    University Centre in Svalbard, 9171 Longyearbyen, Norway,Akvaplan-niva, Fram Centre, 9296 Tromso, Norway,Norwegian Polar Institute, Fram Centre, 9296 Tromso, Norway;

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  • 正文语种 eng
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  • 关键词

    Predator-prey interactions; Polar night; Foraging; Chaetognaths; Arctic; Zooplankton;

    机译：食肉动物与猎物的相互作用;极夜觅食;Chaetognaths;北极;浮游动物;

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