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首页> 外文期刊>Marine ecology progress series >Adaptations to feast and famine in different strains of the marine heterotrophic dinoflagellates Gyrodinium dominans and Oxyrrhis marina
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Adaptations to feast and famine in different strains of the marine heterotrophic dinoflagellates Gyrodinium dominans and Oxyrrhis marina

机译：对海洋异养双鞭毛藻Gyrodinium dominans和Oxyrrhis marina不同菌株对strain节和饥荒的适应

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摘要

Marine planktonic organisms endure fluctuations in food abundance and quality during their life. The degree of resource variability in each specific environment may have forced adaptive survival responses on the organisms inhabiting them. We studied the adaptations to feast and famine of 2 strains of the heterotrophic dinoflagellates Gyrodinium dominans (GYR-DK from Denmark; GYR-BCN from Barcelona) and Oxyrrhis marina (OXY-BCN from Barcelona; OXY-CRB from the Caribbean). Overall, the OXY strains showed contrasting results in terms of feeding, metabolism, and biochemical composition, whereas both GYR strains presented similar responses to the variables measured. OXY-BCN exhibited higher maximum ingestion rates, better capacity to exploit a pulse of food, higher carbon assimilation efficiency and lipid storage capacity, and longer survival time to starvation. When feeding on a fatty acid-rich alga (Rhodomonas salina, RHO), OXY-BCN displayed very high (75 %) gross growth efficiencies (GGE), but showed no growth when conditioned to one that was more fatty acid deficient (Dunaliella tertiolecta, DUN). In contrast, both GYR strains had higher GGE when feeding on DUN (>50 %) compared to a diet of RHO (16 to 22 %). OXY-CRB showed low GGE (<20 %), despite feeding actively on both prey. All strains maintained their carbon and nitrogen stoichiometry after 5 d starvation, but lost some fatty acids, especially OXY. Additionally, when starving, respiration rates decreased by 70% in OXY-BCN, 50% in GYR-DK, and by 25% in OXY-CRB. Our results demonstrate that OXY-BCN is a more opportunistic organism, perfectly adapted to heterogeneous or unstable environments; although it requires a suitable biochemical composition in its prey. On the other hand, GYR seems better conditioned to more stable habitats, such as coastal and open waters. This study also stresses the phenotypic differences between strains (especially of OXY) originating from different ecosystems.
机译：海洋浮游生物在其生命中会承受食物丰度和质量的波动。每个特定环境中资源变异的程度可能迫使居住在其上的生物适应性生存。我们研究了2种异养双鞭毛藻Gyrodinium dominans（来自丹麦的GYR-DK;来自巴塞罗那的GYR-BCN）和Oxyrrhis marina（来自巴塞罗那的OXY-BCN;来自加勒比海的OXY-CRB）对盛宴和饥荒的适应性。总体而言，OXY菌株在摄食，代谢和生化组成方面显示出相反的结果，而两种GYR菌株对测得的变量均表现出相似的响应。 OXY-BCN表现出更高的最大摄食率，更好的利用食物脉冲的能力，更高的碳同化效率和脂质存储能力以及更长的饥饿生存时间。当以富含脂肪酸的藻类（Rhodomonas salina，RHO）为食时，OXY-BCN表现出非常高的（75％）总生长效率（GGE），但是当适应于脂肪酸含量更高的藻类时（Dunaliella tertiolecta）则没有任何生长。 ，DUN）。相比之下，与RHO日粮（16％至22％）相比，两种GYR菌株在以DUN为食（> 50％）时均具有较高的GGE。尽管积极摄食两个猎物，但OXY-CRB显示出较低的GGE（<20％）。饥饿5天后，所有菌株均保持其碳和氮化学计量，但损失了一些脂肪酸，尤其是OXY。此外，饥饿时，OXY-BCN的呼吸速率降低了70％，GYR-DK的呼吸速率降低了，OXY-CRB的呼吸速率降低了25％。我们的结果表明，OXY-BCN是一种更具机会性的有机体，非常适合异质或不稳定的环境。尽管猎物需要合适的生化成分。另一方面，GYR似乎更好地适应了更稳定的栖息地，例如沿海和开放水域。这项研究还强调了源自不同生态系统的菌株（特别是OXY）之间的表型差异。

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  • 来源
    《Marine ecology progress series》 |2013年第30期|67-84|共18页
  • 作者

    Albert Calbet; Stamatina Isari; Rodrigo Andres Martinez; Enric Saiz; Susana Garrido; Janna Peters; Rosa Maria Borrat; Miquel Alcaraz;

  • 作者单位

    Institut de Ciencies del Mar (CSIC), Passeig Maritim de la Barceloneta 37-49, 08003 Barcelona, Spain;

    Institut de Ciencies del Mar (CSIC), Passeig Maritim de la Barceloneta 37-49, 08003 Barcelona, Spain;

    Institut de Ciencies del Mar (CSIC), Passeig Maritim de la Barceloneta 37-49, 08003 Barcelona, Spain;

    Institut de Ciencies del Mar (CSIC), Passeig Maritim de la Barceloneta 37-49, 08003 Barcelona, Spain;

    Centre of Oceanography/Gula Marine Laboratory, Faculty of Sciences, University of Lisbon, Avenida Nossa Senhora do Cabo 939, 2750-374 Cascais, Portugal;

    Institute for Hydrobiology and Fisheries Science, Hamburg University, Grosse Elbstrasse 133, 22767 Hamburg, Germany;

    Institut de Ciencies del Mar (CSIC), Passeig Maritim de la Barceloneta 37-49, 08003 Barcelona, Spain;

    Institut de Ciencies del Mar (CSIC), Passeig Maritim de la Barceloneta 37-49, 08003 Barcelona, Spain;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Gyrodinium dominans; Oxyrrhis marina; Starvation; Strain; Food quality; Feeding; Growth; Respiration; Fatty acids;

    机译：Gyrodinium dominans;滨海草饥饿;应变;食物品质;馈送;成长;呼吸;脂肪酸;

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