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首页> 外文期刊>Estuarine Coastal and Shelf Science >Trophic importance of diatoms in an intertidal Zostera noltii seagrass bed: Evidence from stable isotope and fatty acid analyses
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Trophic importance of diatoms in an intertidal Zostera noltii seagrass bed: Evidence from stable isotope and fatty acid analyses

机译:潮间带Zostera noltii海草床中硅藻的营养重要性:来自稳定同位素和脂肪酸分析的证据

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摘要

A current predominant paradigm emphasizes the role of epiphytic algae for invertebrates in most sea-grass food webs. However, in some intertidal Zostera noltii beds, epiphyte biomass is very low compared to microphytobenthos and seagrass biomasses. We assessed the role of microphytobenthos in a temperate intertidal Z noltii bed by combining stable isotope and fatty acid (FA) analyses on primary producers, composite sources — suspended particulate organic matter (SPOM) and sediment surface organic matter (SSOM) — and the main macrofaunal consumers. Z. noltii showed high B~(13)C (-9.9%,,) and high 18:2(n-6) and 18:3(n-3) contents. Microphytobenthos was slightly more ~(13)C-depleted (-15.4‰) and had high levels of diatom markers: 14:0, 16:l(n-7)c, 20:5(n-3). Low mean 5~(13)C (-22.0‰,J and large amounts of diatom and bacteria (18:l(n-7)c) markers indicated that SPOM was mainly composed of a mixture of fresh and decayed pelagic diatoms. Higher mean δ~(13)C (-17.9‰) and high amounts of diatom FAs were found in SSOM, showing that microphytobenthic diatoms dominate. Very low percentages of 18:2(n-6) and 18:3(n-3) in consumers indicated a low contribution of Z noltii material to their diets. Grazers, deposit and suspension-deposit feeders had 5~(13)C close to microphytobenthos and high levels of diatom FAs, confirming that microphytobenthos represented the main part of their diet. Lower 5~(13)C and higher amounts of flagellate FAs - 22:6(n-3) and 16:4(n-3) - in suspension feeders indicated that their diet resulted from a mixture of SPOM and microphytobenthos. These results demonstrate that invertebrates do not consume high amounts of seagrass and highlight the main role of benthic diatoms in this intertidal seagrass bed.
机译:当前的主要范例强调了附生藻类在大多数海草食物网中对无脊椎动物的作用。但是,在一些潮间带带状浮游动物床中,与微底栖生物和海草生物量相比,附生生物量非常低。我们通过结合稳定同位素和脂肪酸(FA)对主要生产者,复合源(悬浮颗粒有机物(SPOM)和沉积物表面有机物(SSOM))的分析,评估了微藻底栖动物在温带潮汐Z型氮杂床中的作用。大型消费者。 Z. noltii表现出较高的B〜(13)C(-9.9%,)和18:2(n-6)和18:3(n-3)含量。微藻底栖动物的〜(13)C含量略低(-15.4‰),并且硅藻标记物的含量较高:14:0、16:l(n-7)c,20:5(n-3)。平均5〜(13)C(-22.0‰,J)低,硅藻和细菌的大量标记(18:l(n-7)c)表明SPOM主要由新鲜和腐烂的上层硅藻的混合物组成。 SSOM中的平均δ〜(13)C(-17.9‰)和大量的硅藻FAs表明微底栖硅藻占主导地位,18:2(n-6)和18:3(n-3)的百分比非常低消费者表示,诺尔氏菌Z物质对他们的饮食的贡献较低;放牧者,沉积和悬浮沉积的饲喂器接近微底栖动物5〜(13)C,并且硅藻FA含量高,这证实了微底栖动物是其饮食的主要部分。悬浮喂食器中较低的5〜(13)C和较高的鞭毛FAs-22:6(n-3)和16:4(n-3)表示它们的饮食是SPOM和微底栖动物的混合物。证明无脊椎动物不消耗大量海草,并突出了底栖硅藻在潮间带海草床上的主要作用。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2011年第1期|p.140-153|共14页
  • 作者单位

    Littoral Environnement et Society (LIENSs), UMR 6250 CNRS-Universite de La Rochelle, Institut du Littoral et de I'Environnement, 2 rue Olympe de Gouges, 17000 La Rochelle, France;

    Littoral Environnement et Society (LIENSs), UMR 6250 CNRS-Universite de La Rochelle, Institut du Littoral et de I'Environnement, 2 rue Olympe de Gouges, 17000 La Rochelle, France;

    Littoral Environnement et Society (LIENSs), UMR 6250 CNRS-Universite de La Rochelle, Institut du Littoral et de I'Environnement, 2 rue Olympe de Gouges, 17000 La Rochelle, France;

    Littoral Environnement et Society (LIENSs), UMR 6250 CNRS-Universite de La Rochelle, Institut du Littoral et de I'Environnement, 2 rue Olympe de Gouges, 17000 La Rochelle, France;

    Littoral Environnement et Society (LIENSs), UMR 6250 CNRS-Universite de La Rochelle, Institut du Littoral et de I'Environnement, 2 rue Olympe de Gouges, 17000 La Rochelle, France;

    Littoral Environnement et Society (LIENSs), UMR 6250 CNRS-Universite de La Rochelle, Institut du Littoral et de I'Environnement, 2 rue Olympe de Gouges, 17000 La Rochelle, France;

    Emimnnement Littoral Atlantique (ELA), UMS 3109 CNRS-IFREMER, Place Gaby Coll, BP 5, 17137 Uhoumeau, France;

    Littoral Environnement et Society (LIENSs), UMR 6250 CNRS-Universite de La Rochelle, Institut du Littoral et de I'Environnement, 2 rue Olympe de Gouges, 17000 La Rochelle, France;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    food web; intertidal seagrass bed; microphytobenthos; zostera noltii; stable isotope ratio; fatty acid profiles; european atlantic coast;

    机译:食物网;潮间带海草床;微藻底栖动物;结缕草;稳定同位素比;脂肪酸谱;欧洲大西洋海岸;

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