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首页> 外文期刊>Harmful Algae >Retrospective analysis of associations between water quality and toxic blooms of golden alga (Prymnesium parvum) in Texas reservoirs: Implications for understanding dispersal mechanisms and impacts of climate change
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Retrospective analysis of associations between water quality and toxic blooms of golden alga (Prymnesium parvum) in Texas reservoirs: Implications for understanding dispersal mechanisms and impacts of climate change

机译：回顾性分析德克萨斯州水库中水质与金藻（Prymnesium parvum）有毒水华之间的关联：对理解扩散机制和气候变化影响的意义

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摘要

Toxic blooms of golden alga (GA, Prymnesium parvum) in Texas typically occur in winter or early spring. In North America, they were first reported in Texas in the 1980s, and a marked range expansion occurred in 2001. Although there is concern about the influence of climate change on the future distribution of GA, factors responsible for past dispersals remain uncertain. To better understand the factors that influence toxic bloom dispersal in reservoirs, this study characterized reservoir water quality associated with toxic GA blooms since 2001, and examined trends in water quality during a 20-year period bracketing the 2001 expansion. Archived data were analyzed for six impacted and six nonimpacted reservoirs from two major Texas basins: Brazos River and Colorado River. Data were simplified for analysis by pooling spatially (across sampling stations) and temporally (winter, December-February) within reservoirs and generating depth-corrected (1 m) monthly values. Classification tree analysis [period of record (POR), 2001-2010] using salinity-associated variables (specific conductance, chloride, sulfate), dissolved oxygen (DO), pH, temperature, total hardness, potassium, nitrate+nitrite, and total phosphorus indicated that salinity best predicts the toxic bloom occurrence. Minimum estimated salinities for toxic bloom formation were 0.59 and 1.02 psu in Brazos and Colorado River reservoirs, respectively. Principal component analysis (POR, 2001-2010) indicated that GA habitat is best defined by higher salinity relative to nonimpacted reservoirs, with winter DO and pH also being slightly higher and winter temperature slightly lower in impacted reservoirs. Trend analysis, however, did not reveal monotonic changes in winter water quality of GA-impacted reservoirs during the 20-year period (1991-2010) bracketing the 2001 dispersal. Therefore, whereas minimum levels of salinity are required for GA establishment and toxic blooms in Texas reservoirs, the lack of trends in water quality suggests that conditions favorable for toxic blooms pre-date the 2001 expansion. These observations are consistent with a climate change-independent scenario of past GA dispersals in Texas reservoirs driven by novel introductions into pre-existing favorable habitat. Reports of latent GA populations in certain nonimpacted reservoirs, however, provide a plausible scenario of future dispersals characterized by prolonged periods between colonization and toxic bloom development and driven by changes in water quality, natural, or anthropogenic.
机译：得克萨斯州的金藻（GA，小金鸡）有毒的花开通常发生在冬季或早春。在北美，最早在1980年代报道了它们，并在2001年出现了明显的范围扩大。尽管人们担心气候变化对GA未来分布的影响，但造成过去扩散的因素仍然不确定。为了更好地了解影响水库中有毒水华扩散的因素，本研究对2001年以来与有毒GA水华相关的水库水质进行了表征，并考察了2001年扩张后20年的水质趋势。分析了得克萨斯州两个主要盆地（布拉索斯河和科罗拉多河）的六个受影响和六个未受影响的水库的存档数据。通过在储层内在空间上（跨采样站）和时间上（冬季，12月至2月）合并数据并简化深度（1 m）月度值，简化了分析数据。使用与盐度相关的变量（比电导，氯化物，硫酸盐），溶解氧（DO），pH，温度，总硬度，钾，硝酸盐+亚硝酸盐和总盐分，进行分类树分析[记录时间（POR），2001-2010]磷表明盐度最能预测毒物的爆发。在布拉索斯和科罗拉多河水库中，有毒水华形成的最低估计盐度分别为0.59和1.02 psu。主成分分析（POR，2001-2010）表明，相对于未受影响的水库，GA栖息地的最佳定义是盐度较高，受影响的水库的冬季溶解氧和pH值也略高，冬季温度略低。但是，趋势分析并未显示在受2001年扩散影响的20年期间（1991-2010年），受GA影响的水库的冬季水质单调变化。因此，尽管在德克萨斯州的水库中建立GA和有毒水华需要最低的盐度水平，但缺乏水质趋势表明，有毒水华的有利条件早于2001年的扩张。这些观察结果与得克萨斯州水库过去GA扩散不受气候变化影响的情况相吻合，这是由于对已有的有利栖息地进行了新的介绍而引起的。然而，关于某些未受影响水库中潜在GA种群的报道提供了未来扩散的合理情况，其特征是定居和有毒水华发展之间的时间延长，并受水质，自然或人为因素的驱动。

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  • 来源
    《Harmful Algae》 |2014年第3期|1-11|共11页
  • 作者

    Reynaldo Patino; Dan Dawson; Matthew M. VanLandeghem;

  • 作者单位

    U.S. Geological Survey, Texas Cooperative Fish and Wildlife Research Unit and Departments of Natural Resources Management and Biological Sciences, Texas Tech University, Lubbock, TX 79409-2120, USA;

    Texas Cooperative Fish and Wildlife Research Unit, Texas Tech University, Lubbock, TX 79409-2120, USA;

    Department of Natural Resources Management and Texas Cooperative Fish and Wildlife Research Unit, Texas Tech University, Lubbock, TX 74909-2120, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Harmful algal bloom; Inland waters; Range expansion; Salinity; Water quality trends;

    机译：有害的藻华;内陆水域;范围扩大;盐度;水质趋势;

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