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首页> 外文期刊>Marine ecology progress series >Correlation between allochthonous subsidy input and isotopic variability in the giant kelp Macrocystis pyrifera in central California, USA
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Correlation between allochthonous subsidy input and isotopic variability in the giant kelp Macrocystis pyrifera in central California, USA

机译：美国中部加利福尼亚州巨型海藻巨孢藻的异源补贴输入与同位素变异之间的关系

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摘要

Isotope values of primary producers can vary greatly across space and time due to changes in physiological status and the source of subsidies used in photosynthesis. Forests of the giant kelp Macrocystis occur in temperate oceans around the world and are positioned at the land-sea interface where they may receive subsidies from terrestrial and open ocean sources. In this study, we investigated the spatial and temporal variability in δ~(13)C and δ~(15)N values of M. pyrifera over 3 yr in Big Sur, California, USA. During each of those 3 yr, δ~(13)C and δ~(15)N values of M. pyrifera varied significantly by season, with low values occurring in the spring, and high values in the fall. To examine the possible mechanisms driving this seasonal variability, we used step-wise multiple regression analyses to test whether the variability in kelp isotope values was correlated with the variability in nitrate concentration or the delivery of subsidies via upwelling circulation and river discharge. We found that temporal variation in kelp isotope values was most strongly related to the strength of upwelling and the concentration of nitrate in surface waters. The results of this study increase our understanding of the mechanisms that drive the temporal and seasonal isotopic variability in marine primary producers. This study also highlights the importance of measuring isotope variability at the base of the food chain in order to create more robust trophic predictions.
机译：由于生理状态的变化和光合作用的补贴来源，初级生产者的同位素值会在空间和时间上变化很大。巨型海带Macrocystis的森林分布在世界各地的温带海洋中，并位于陆地-海洋交界处，在那里它们可能会从陆地和远洋资源获得补贴。在这项研究中，我们调查了美国加利福尼亚州大苏尔地区3年以上的火竹分枝杆菌δ〜（13）C和δ〜（15）N值的时空变化。在这3年中的每一个年中，黄萎病菌的δ〜（13）C和δ〜（15）N值随季节变化很大，春季时较低，秋季时较高。为了研究驱动这种季节性变化的可能机制，我们使用了逐步多元回归分析来检验海带同位素值的变化是否与硝酸盐浓度的变化或通过上升流和河流排放的补贴的输送相关。我们发现，海带同位素值的时间变化与上升流的强度和地表水中硝酸盐的浓度最密切相关。这项研究的结果加深​​了我们对驱动海洋初级生产者时空和季节同位素变异的机制的理解。这项研究还强调了在食物链底部测量同位素变异性的重要性，以建立更可靠的营养预测。

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  • 来源
    《Marine ecology progress series》 |2010年第23期|P.41-50|共10页
  • 作者

    Melissa M. Foley; Paul L. Koch;

  • 作者单位

    University of California Santa Cruz, Ecology and Evolutionary Biology, Long Marine Lab, 100 Shaffer Rd., Santa Cruz, California 95060, USA Stanford University, Center for Ocean Solutions, 99 Pacific St. Suite 155a, Monterey, California 93940, USA;

    rnUniversity of California Santa Cruz, Earth and Planetary Sciences, 1156 High St., Santa Cruz, California 95064, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    macrocystis; kelp; stable isotopes; allochthonous subsidies; upwelling;

    机译：巨囊藻海带;稳定同位素异地补贴;上升;

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