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首页> 外文期刊>Marine ecology progress series >Variability in stable isotope values of South African Laminariales, Ecklonia maxima and Laminaria pallida, over different spatial and temporal scales
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Variability in stable isotope values of South African Laminariales, Ecklonia maxima and Laminaria pallida, over different spatial and temporal scales

机译：南非海带，最大埃克罗尼亚菌和浅海带在不同时空尺度上稳定同位素值的变异性

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摘要

Kelp forests are some of the most productive habitats in the oceans, supporting diverse, ecologically, and often commercially, important ecosystems. This study of 8 geographically separate sites in 2 seasons highlights the natural variability of stable isotope values (delta C-13 and delta N-15), at different spatial and temporal scales, within the 2 dominant kelp species along the west coast of South Africa. Additionally, stable isotope variability was investigated within and among different tissues within both kelp species. Within a kelp plant, delta C-13 values had a variance of 1.7 parts per thousand for Ecklonia maxima and 1.5 parts per thousand for Laminaria pallida. The delta N-15 values had a variance of 3.8 parts per thousand for E. maxima and 4.2 parts per thousand for L. pallida. There were also consistent variability patterns along the length of a single frond in both species, for both isotopes. Among the localities, E. maxima and L. pallida were highly variable with variances in delta C-13 (9.4 parts per thousand and 11.2 parts per thousand) and delta N-15 (3.4 parts per thousand and 4.5 parts per thousand) for the 2 species respectively. The delta C-13 values of L. pallida and E. maxima displayed a clear pattern coinciding with depth, particularly for L. pallida. Within-site variability was a major contributor to the overall spatial variability for both species. This study provides further evidence for the importance of understanding basal variability of stable isotope values when determining the carbon sources of bottom-up controlled ecosystems.
机译：海带森林是海洋中生产力最高的栖息地，支持着多样化的，在生态上以及通常在商业上重要的生态系统。这项研究在2个季节中对8个地理上分离的地点进行了研究，突显了南非西海岸2个主要海带物种在不同的时空尺度上稳定同位素值（δC-13和δN-15）的自然变异性。 。此外，研究了两种海带物种内部和内部不同组织之间稳定的同位素变异性。在一个海带植物中，最大的埃克洛尼亚州的C-13值差异为千分之1.7，淡色海带的差异为千分之1.5。 ΔN-15值的最大值对大肠埃希氏菌有千分之3.8的变化，而对帕氏乳杆菌则有4.2千分的变化。在两个物种中，两种同位素都沿着单个叶状体的长度存在一致的变异性模式。在这些地区中，最大的E. maxima和L. pallida的变化很大，C-13的差异（千分之9.4和千分之11.2）和N-15的变化（千分之3.4和千分之4.5）各不相同。 2种。浅色乳杆菌和最大大肠杆菌的δC-13值显示出与深度一致的清晰模式，特别是对于浅色乳杆菌。场地内变异是两个物种总体空间变异的主要因素。这项研究为确定自下而上受控生态系统的碳源时，了解稳定同位素值的基础变异性的重要性提供了进一步的证据。

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  • 来源
    《Marine ecology progress series》 |2019年第10期|55-71|共17页
  • 作者

    Dyer David C.; Butler Mike J.; Smit Albertus J.; Anderson Robert J.; Bolton John J.;

  • 作者单位

    Univ Cape Town Biol Sci Dept Private Bag X3 ZA-7701 Rondebosch South Africa;

    iThemba LABS Environm Isotope Lab Private Bag 11 ZA-2050 Johannesburg South Africa;

    Univ Western Cape Biodivers & Conservat Biol Programme Private Bag X17 ZA-7535 Bellville South Africa|South African Environm Observat Network ZA-6031 Port Elizabeth South Africa;

    Univ Cape Town Biol Sci Dept Private Bag X3 ZA-7701 Rondebosch South Africa|Nelson Mandela Univ African Ctr Coastal Palaeosci POB 77000 ZA-6031 Port Elizabeth South Africa;

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  • 正文语种 eng
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  • 关键词

    delta C-13; delta N-15; Laminariales; South Africa;

    机译：δC-13;三角洲N-15;海带;南非;

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