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首页> 外文期刊>Marine ecology progress series >Multi-tissue stable isotope analysis reveals resource partitioning and trophic relationships of large reef-associated predators
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Multi-tissue stable isotope analysis reveals resource partitioning and trophic relationships of large reef-associated predators

机译：多组织稳定同位素分析揭示了与大礁有关的捕食者的资源分配和营养关系

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摘要

Defining the role of reef predators is particularly important given the rapid rate at which some species are declining, yet knowledge of trophic relationships is often lacking, particularly for large wide-ranging species that may use coral reefs seasonally or opportunistically. We used a multi-tissue stable isotope approach to investigate the trophic ecology of common reef predators in the central Great Barrier Reef of Australia. Our study revealed significant trophic separation among reef predators, especially when considering isotopic data from muscle, a slower turnover tissue. Based on muscle data, the bull shark Carcharhinus leucas, a large wide-ranging coastal species, occupied a higher trophic position and had a larger isotopic niche breadth (19.1 parts per thousand(2)) relative to smaller predators, including resident sharks (4.5 +/- 0.7 parts per thousand(2)) and large-bodied teleosts (4.4 +/- 1.8 parts per thousand(2)). Spanish mackerel Scomberomorus commerson and bull sharks had the largest unique total areas of isotopic niche space (expressed as a percentage) that did not overlap with any other species, 95% and 69.4 %, respectively, which means they had lower isotopic overlap. In general, faster turnover tissues such as whole blood and plasma showed higher isotopic overlap and smaller niche breadth for all reef predators. These results suggest that bull sharks use similar prey resources to large and small resident predators, at least during short periods. Our findings highlight the importance of investigating dietary changes in faster-turnover tissues of reef predators, particularly large wide-ranging species, which may have key roles in coral reef food webs through direct predation and competition.
机译：鉴于某些物种的迅速减少，界定珊瑚礁掠食者的作用尤为重要，但人们通常缺乏营养关系的知识，特别是对于可能在季节性或机会性使用珊瑚礁的大范围物种。我们使用多组织稳定同位素方法研究了澳大利亚中部大堡礁中常见礁石捕食者的营养生态。我们的研究揭示了珊瑚礁捕食者之间的显着营养分离，尤其是考虑来自肌肉（一种较慢周转组织）的同位素数据时。根据肌肉数据，相对于较小的食肉动物，包括居居的鲨鱼（4.5），大型鲨鱼Carcharhinus leucas是一种广泛的沿海物种，占据较高的营养位置，并且具有较大的同位素生态位宽度（19.1千分之一（2））。 +/- 0.7份/千（2））和大块硬骨鱼（4.4 +/- 1.8份/千（2））。西班牙鲭鱼的Scomberomorus commerson和公牛鲨的同位素小生境总面积最大（以百分比表示），与其他任何物种都不重叠，分别为95％和69.4％，这意味着它们的同位素重叠较低。通常，所有珊瑚礁捕食者的周转速度更快的组织（例如全血和血浆）显示出更高的同位素重叠和较小的利基宽度。这些结果表明，公牛鲨至少在短期内会使用与大型和小型居民捕食者相似的猎物资源。我们的发现凸显了调查礁石掠食者，特别是大范围物种的快速周转组织中饮食变化的重要性，这些变化可能通过直接捕食和竞争在珊瑚礁食物网中发挥关键作用。

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  • 来源
    《Marine ecology progress series》 |2019年第18期|159-176|共18页
  • 作者

    Espinoza Mario; Matley Jordan; Heupel Michelle R.; Tobin Andrew J.; Fisk Aaron T.; Simpfendorfer Colin A.;

  • 作者单位

    James Cook Univ Ctr Sustainable Trop Fisheries & Aquaculture Townsville Qld 4811 Australia|James Cook Univ Coll Sci & Engn Townsville Qld 4811 Australia|James Cook Univ Coll Marine & Environm Sci Australian Inst Marine Sci Townsville Qld 4811 Australia|Univ Costa Rica Ctr Invest Ciencias Mar & Limnol San Jose 206011501 Costa Rica|Univ Costa Rica Escuela Biol San Jose 206011501 Costa Rica;

    Great Lakes Inst Environm Res Windsor ON N9B 304 Canada;

    Australian Inst Marine Sci PMB 3 Townsville Qld 4810 Australia;

    James Cook Univ Ctr Sustainable Trop Fisheries & Aquaculture Townsville Qld 4811 Australia|James Cook Univ Coll Sci & Engn Townsville Qld 4811 Australia;

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  • 正文语种 eng
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  • 关键词

    Trophic ecology; Shark; Food web; Coral reef; Spatial ecology; Great Barrier Reef;

    机译：营养生态学;鲨鱼;食物网;珊瑚礁;空间生态学;大堡礁;

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