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首页> 外文期刊>Marine ecology progress series >Diet-dependent δ~(13)C and δ~(15)N fractionation among sea urchin Lytechinus variegatus tissues: implications for food web models
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Diet-dependent δ~(13)C and δ~(15)N fractionation among sea urchin Lytechinus variegatus tissues: implications for food web models

机译：饮食依赖的δ-（13）C和δ-（15）N分离海胆Lytechinus variegatus组织中：对食物网模型的影响

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摘要

Consumer-diet discrimination factors (△~(15)N and △~(13)C) are often applied without cor-roboration from laboratory experiments. Deviations in △~(15)N and △~(13)C that may occur from different diet types were quantified by raising 120 sea urchins Lytechinus variegatus in laboratory tanks on 3 different diets: seagrass Thalassia testudinum, red foliose macroalgae (Grauteloupia sp. and Palmaria palmata) and a mixed diet specifically formulated for L. variegatus. Patterns of δ~(13)C and δ~(15)N and resulting fractionation factors were then determined in muscle, gonad, gut, test organic matrix and whole individuals. Tissue δ~(13)C values showed a strong positive association with δ~(13)C of diets and estimates of absorption efficiency (R~2 = 0.81). The seagrass diet consistently resulted in negative △~(13)C values in all tissues (from -0.86‰ in muscle to -1.63 ‰ in gonad) and whole individuals (-1.19‰), whereas macroalgal and formulated diets showed positive values (0.11 and 0.19‰, respectively). Only individuals on the formulated diet clearly reached isotopic equilibrium for 813C, suggesting that other lower quality diets may have resulted in more continuous realloca-tion of internal resources. δ~(15)N values increased as the nitrogen content of these diets decreased (3.18,1.21 and 0.82‰ for seagrass, macroalgae and formulated diets, respectively). Overall differences in the biochemical composition of diets and a robust relationship between δ~(13)C and δ~(15)N signatures suggest that protein quantity and quality could be central in driving isotope fractionation. The influence of macrophyte material type in the diet can be stronger than that of trophic level for both δ~(13)C and δ~(15)N, so further compound-specific isotope analyses are necessary to determine reliable values of △~(13)C and △~(15)N for ecological applications.
机译：消费者饮食歧视因素（△〜（15）N和△〜（13）C）通常在没有实验室实验证实的情况下使用。通过在3种不同日粮的实验室鱼缸中饲养120只海胆Lytechinus variegatus来量化不同日粮类型可能引起的△〜（15）N和△〜（13）C的偏差：海草地中海藻，红叶大型藻类（Grauteloupia sp。和Palmaria palmata）和混合饲料，专门为百日咳杆菌而设计。然后确定肌肉，性腺，肠道，受试有机基质和整个个体中δ〜（13）C和δ〜（15）N的模式以及产生的分馏因子。组织中的δ〜（13）C值与日粮中的δ〜（13）C呈极显着正相关，并与吸收效率相关（R〜2 = 0.81）。海藻饮食在所有组织（从肌肉中的-0.86‰到性​​腺中的-1.63‰）和整个个体（-1.19‰）中始终导致负的△〜（13）C值，而大型藻类和配方饮食显示为正值（0.11）和0.19‰）。只有采用配方饮食的个体才能明显达到813C的同位素平衡，这表明其他较低质量的饮食可能导致内部资源的更连续再分配。随着日粮中氮含量的降低，δ〜（15）N值增加（海草，大型藻类和配方日粮分别为3.18、1.21和0.82‰）。日粮生化成分的总体差异以及δ〜（13）C和δ〜（15）N标记之间的稳固关系表明，蛋白质的数量和质量可能是驱动同位素分级的关键。对于δ〜（13）C和δ〜（15）N而言，日粮中大型植物材料类型的影响可能比营养水平高，因此有必要进一步进行化合物特异性同位素分析，以确定可靠的△〜（ 13）C和△〜（15）N用于生态应用。

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  • 来源
    《Marine ecology progress series》 |2012年第21期|p.175-190|共16页
  • 作者

    Patricia Prado; Ruth H. Carmichael; Stephen A. Watts; Just Cebrian; Kenneth L. Heck;

  • 作者单位

    Institut de Recerca i Tecnologia Agroalimentaries (IRTA), Aquatic Ecosystems, Ctra Poble Nou km 5.5, 43540 Sant Carles de la Rapita, Tarragona, Spain,Department of Biology, East Carolina University, Greenville, North Carolina 27858, USA;

    Dauphin Island Sea Lab, 101 Bienvllle Boulevard, Dauphin Island, Alabama 36528, USA,Department of Marine Sciences, University of South Alabama, LSCB 25, Mobile, Alabama 36688, USA;

    Department of Biology, University of Alabama at Birmingham, University Station, Birmingham, Alabama 35294-1170, USA;

    Dauphin Island Sea Lab, 101 Bienvllle Boulevard, Dauphin Island, Alabama 36528, USA,Department of Marine Sciences, University of South Alabama, LSCB 25, Mobile, Alabama 36688, USA;

    Dauphin Island Sea Lab, 101 Bienvllle Boulevard, Dauphin Island, Alabama 36528, USA,Department of Marine Sciences, University of South Alabama, LSCB 25, Mobile, Alabama 36688, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    seagrass; macroalgae; omnivory; diet quality; absorption efficiency;

    机译：海草大型藻类杂食饮食质量;吸收效率;

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