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Season, molt, and body size influence mercury concentrations in grebes

机译：季节，蜕皮和体重会影响中的汞含量

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摘要

We studied seasonal and physiological influences on mercury concentrations in western grebes (Aechmophorus occidentalis) and Clark's grebes (A. occidentalis) across 29 lakes and reservoirs in California, USA. Additionally, at three of these lakes, we conducted a time series study, in which we repeatedly sampled grebe blood mercury concentrations during the spring, summer, and early fall. Grebe blood mercury concentrations were higher among males (0.61 +/- 0.12 mu g/g ww) than females (0.52 +/- 0.10 mu g/g ww), higher among Clark's grebes (0.58 +/- 0.12 mu g/g ww) than western grebes (0.51 +/- 0.10 mu g/g ww), and exhibited a strong seasonal pattern (decreasing by 60% from spring to fall). Grebe blood THg concentrations exhibited a shallow, inverse U-shaped pattern with body size, and was lowest among the smallest and largest grebes. Further, the relationship between grebe blood mercury concentrations and wing primary feather molt exhibited a shallow U-shaped pattern, where mercury concentrations were highest among birds that had not yet begun molting, decreased approximately 24% between pre-molt and late molt, and increased approximately 19% from late molt to post-molt. Because grebes did not begin molting until mid-summer, lower grebe blood mercury concentrations observed in late summer and early fall were consistent with the onset of primary feather molt. However, because sampling date was a much stronger predictor of grebe mercury concentrations than molt, other seasonally changing environmental factors likely played a larger role than molt in the seasonal variation in grebe mercury concentrations. In the time series study, we found that seasonal trends in grebe mercury concentrations were not consistent among lakes, indicating that lake-specific variation in mercury dynamics influence the overall seasonal decline in grebe blood mercury concentrations. These results highlight the importance of accounting for sampling date, as well as ecological processes that may influence mercury concentrations, when developing monitoring programs to assess site-specific exposure risk of mercury to wildlife. Published by Elsevier Ltd.
机译：我们研究了在美国加利福尼亚州的29个湖泊和水库中，西部格里布（Aechmophorus occidentalis）和克拉克格里布（A. occidentalis）中汞浓度的季节性和生理影响。此外，在其中三个湖泊中，我们进行了时间序列研究，其中我们在春季，夏季和初秋期间反复采样了be血中的汞含量。男性（0.61 +/- 0.12μg / g ww）的血汞浓度高于女性（0.52 +/- 0.10μg/ g ww），克拉克氏族（0.58 +/- 0.12μg/ g ww）高），而不是西方的bes（0.51 +/- 0.10μg / g ww），并且表现出强烈的季节性模式（从春季到秋季下降60％）。血THg浓度随身体大小呈浅U型倒立图形，在最小和最大的中最低。此外，血中的汞含量与翅膀初级羽毛蜕之间的关系呈浅U形模式，其中汞浓度在尚未开始蜕变的禽类中最高，在蜕皮前和后期蜕皮之间降低约24％，然后增加从蜕皮后期到蜕皮后期约占19％。由于直到夏末才开始蜕变，因此在夏末和初秋观察到较低的血汞浓度与原羽毛蜕皮的发生是一致的。但是，由于采样日期比虫更能预测中汞的浓度，因此其他季节性变化的环境因素可能比be鼠在concentrations中汞浓度的季节性变化中起更大的作用。在时间序列研究中，我们发现湖泊之间格里布汞含量的季节性趋势不一致，这表明特定于湖泊的汞动态变化会影响格里布血液中汞含量的总体季节性下降。这些结果突显了在制定监测计划以评估特定地点的汞对野生生物的暴露风险时，考虑采样日期以及可能影响汞浓度的生态过程的重要性。由Elsevier Ltd.发布

著录项

  • 来源
    《Environmental Pollution》 |2017年第10期|29-39|共11页
  • 作者

    Hartman C. Alex; Ackerman Joshua T.; Herzog Mark P.; Eagles-Smith Collin A.;

  • 作者单位

    US Geol Survey, Dixon Field Stn, Western Ecol Res Ctr, 800 Business Pk Dr, Dixon, CA 95620 USA;

    US Geol Survey, Dixon Field Stn, Western Ecol Res Ctr, 800 Business Pk Dr, Dixon, CA 95620 USA;

    US Geol Survey, Dixon Field Stn, Western Ecol Res Ctr, 800 Business Pk Dr, Dixon, CA 95620 USA;

    US Geol Survey, Forest & Rangeland Ecosyst Sci Ctr, 3200 SW Jefferson Way, Corvallis, OR 97331 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Birds; Mercury; Molt; Season; Time series;

    机译：鸟类;水星;蜕皮;季节;时间序列;

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