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首页> 外文期刊>Polar biology >Feeding ecology and trophic impact of the hydroid Obelia dichotoma in the Kongsfjorden (Spitsbergen, Arctic)
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Feeding ecology and trophic impact of the hydroid Obelia dichotoma in the Kongsfjorden (Spitsbergen, Arctic)

机译：Kongsfjorden（Spitsbergen，北极）的水状Obelia dichotoma的进食生态学和营养影响

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摘要

Obelia dichotoma is a thecate hydroid with a worldwide distribution, occurring mainly on shallow water hard substrates. Since the trophic ecology of hydroids in polar waters is badly understood, the aim of the present work was to study qualitatively and quantitatively the diet of these organisms in an Arctic environment and to determine their trophic significance. For this purpose, the density of the hydroid population was documented, and simultaneously, zooplankton was sampled in two different years (1997 and 1998). Prey capture rates were estimated by analysing the gastrovascular content of the polyps in a diurnal cycle. Additionally, the digestion time of O. dichotoma was measured by laboratory feeding experiments using diatoms as food items. The analyses of the gastrovascular cavities of the polyps sampled during the diurnal cycles showed that O. dichotoma fed mainly on faecal pellets, organic matter and microalgae. Zooplankton prey was also observed, but gastrovascular contents and zooplankton abundance did not show any correlation in both years. The consumption rates of the hydroid populations differed between the 2 years. It was almost double (8.9 mg Carbon m~(-2)) in 1998 compared to 1997 (5.5 mg Carbon m~(-2)). The significance of the environmental variability in the feeding ecology and population dynamics of hydroids under Arctic conditions is discussed.
机译：Obelia dichotoma是一种在世界范围内分布的主题类水解物，主要发生在浅水硬质基质上。由于对极地水中的水合物的营养生态学了解甚少，因此本研究的目的是定性和定量研究北极环境中这些生物的饮食并确定其营养意义。为此，记录了水体种群的密度，同时在两个不同的年份（1997年和1998年）对浮游动物进行了采样。通过分析昼夜周期中息肉的胃血管含量来估计猎物的捕获率。另外，通过使用硅藻作为食物的实验室进食实验来测量双歧稻的消化时间。对昼夜周期内采集到的息肉胃血管腔的分析表明，双歧稻主要以粪便颗粒，有机物和微藻为食。还观察到了浮游动物的猎物，但是在这两年中，胃血管含量和浮游动物的丰度没有显示任何相关性。两年间水体种群的消耗率有所不同。与1997年（5.5 mg Carbon m〜（-2））相比，1998年几乎增加了一倍（8.9 mg Carbon m〜（-2））。讨论了在北极条件下环境变化对摄食生态学和水体种群动态的重要性。

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  • 来源
    《Polar biology》 |2013年第1期|61-72|共12页
  • 作者

    Covadonga Orejas; Sergio Rossi; Aurea Peralba; Eva Garcia; Josep Maria Gili; Heike Lippert;

  • 作者单位

    Instituto Espanol de Oceanografia, Centro Oceanografico de Baleares, Moll de Ponent s, 07015 Palma de Mallorca, Spain,Instituto de Ciencias del Mar (CSIC), Pg. Maritim de la Barceloneta 37-49, 08003 Barcelona, Spain,Alfred Wegener Institute for Polar and Marine Research,Columbusstrasse, 27568 Bremerhaven, Germany;

    Institut de Ciencia i Tecnologia Ambientals ICTA, Universitat Autonoma de Barcelona UAB, UAB Campus Cn s.,08193 Cerdanyola del Valles, Spain;

    Instituto de Ciencias del Mar (CSIC), Pg. Maritim de la Barceloneta 37-49, 08003 Barcelona, Spain;

    Instituto de Ciencias del Mar (CSIC), Pg. Maritim de la Barceloneta 37-49, 08003 Barcelona, Spain;

    Instituto de Ciencias del Mar (CSIC), Pg. Maritim de la Barceloneta 37-49, 08003 Barcelona, Spain;

    Alfred Wegener Institute for Polar and Marine Research,Columbusstrasse, 27568 Bremerhaven, Germany,Institute of Biological Sciences, Department of Applied Ecology,University of Rostock, 18057 Rostock, Germany;

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  • 正文语种 eng
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  • 关键词

    trophic ecology; benthic suspension feeders; hydroids; obelia dichotoma; arctic;

    机译：营养生态底栖悬浮喂食器;流体欧lia虫北极;

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