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首页> 外文期刊>Regulated Rivers Research & Management >STABLE ISOTOPE ANALYSIS REVEALS FOOD WEB STRUCTURE AND WATERSHED IMPACTS ALONG THE FLUVIAL GRADIENT OF A MESOAMERICAN COASTAL RIVER
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STABLE ISOTOPE ANALYSIS REVEALS FOOD WEB STRUCTURE AND WATERSHED IMPACTS ALONG THE FLUVIAL GRADIENT OF A MESOAMERICAN COASTAL RIVER

机译：稳定的同位素分析揭示了中美洲沿海河流的食物网结构和流水作用

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摘要

Ecosystem processes and biological community structure are expected to change in a relatively predictable manner along fluvial gradients within river basins. Such predictions are heavily based on temperate rivers, and food web variation along fluvial gradients in Mesoamerican rivers has received limited attention. In this study, we analyzed carbon and nitrogen stable isotope ratios of basal carbon sources and dominant consumer species to examine aquatic food web structure along the fluvial gradient of the Monkey River Basin, Belize. Similar to previous studies in other regions, consumer species richness and functional diversity increased along the downstream fluvial gradient, due in part to the addition of estuarine species in lower reaches and increasing diversity of piscivorous species along the gradient. Aquatic food webs in upstream reaches were primarily supported by allochthonous production sources, and in-stream sources increased in importance along the downstream gradient. Our study system traversing the Maya Mountain Marine Area Transect also provided a unique opportunity to test the utility of primary consumer δ~(15)N as an indicator of watershed impacts within a tropical basin with a diverse biota and a different type of agricultural impact than typically studied (i.e. banana plantations vs. tilled row cropping). As expected, primary consumer δ~(15)N at sites draining impacted watersheds was enriched compared to values from forested reference sites. Assessment of primary consumer δ~(15)N may be a feasible option for monitoring watershed impacts on aquatic food webs in service of the ridge-to-reef conservation strategy adopted for this watershed as well as in other tropical river basins. Copyright (c) 2010 John Wiley & Sons, Ltd.
机译：预计生态系统过程和生物群落结构将沿着流域内的河流梯度以相对可预测的方式变化。这种预测主要基于温带河流，而中美洲河流沿河流坡度的食物网变化受到的关注很少。在这项研究中，我们分析了基础碳源和主要消费物种的碳和氮稳定同位素比率，以研究伯利兹猴子河盆地沿河流梯度的水生食物网结构。与其他地区的先前研究相似，消费物种的丰富性和功能多样性沿下游河流梯度增加，部分原因是下游增加了河口物种，沿该梯度增加了食鱼物种的多样性。上游河段的水生食物网主要由异源生产来源提供支持，而下游来源的重要性日益增加。我们遍历玛雅山海洋地区样带的研究系统还提供了一个独特的机会来测试主要消费者δ〜（15）N的效用，以作为生物群落和农业影响类型不同的热带盆地内流域影响的指标。通常进行研究（即香蕉种植园与耕种行耕）。不出所料，与受到森林影响的参考点相比，排泄受影响流域的地点的主要消费者δ〜（15）N富集。评估主要消费者δ〜（15）N可能是监测流域对水生食物网的影响的可行选择，以服务于该流域以及其他热带河流域所采用的脊礁保护策略。版权所有（c）2010 John Wiley＆Sons，Ltd.

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  • 来源
    《Regulated Rivers Research & Management》 |2011年第6期|p.791-803|共13页
  • 作者

    KIRK O. WINEMILLER; DAVID J. HOEINGHAUS; ALLISON A. PEASE; PETER C. ESSELMAN; RODNEY L. HONEYCUTT; DONMALE GBANAADOR; ELIZABETH CARRERA; JOSIAH PAYNE;

  • 作者单位

    Section of Ecology, Evolution and Systematic Biology, Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX 77843-2258, USA;

    Section of Ecology, Evolution and Systematic Biology, Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX 77843-2258, USA,Department of Biological Sciences and the Institute of Applied Sciences, University of North Texas, 1155 Union Circle 4310559, Denton, TX 76203-5017,USA;

    Section of Ecology, Evolution and Systematic Biology, Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX 77843-2258, USA;

    Department of Fisheries and Wildlife, Michigan State University, 13 Natural Resources Building, East Lansing, Ml 48824-1222, USA;

    Natural Science Division, Seaver College, Pepperdine University, 24255 Pacific Coast Highway, Malibu, CA 90263 USA;

    Section of Ecology, Evolution and Systematic Biology, Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX 77843-2258, USA;

    Section of Ecology, Evolution and Systematic Biology, Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX 77843-2258, USA;

    Section of Ecology, Evolution and Systematic Biology, Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX 77843-2258, USA;

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  • 正文语种 eng
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  • 关键词

    banana plantation; belize; bladen river; fish; fluvial gradient; maya mountain marine area transect; pollution; river continuum; trophic ecology;

    机译：香蕉种植园伯利兹布拉德河鱼;河流梯度玛雅山海洋地区样带;污染;河流连续体营养生态;

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