Size and biomagnification: How Habitat selection explains beluga mercury levels.
Size and biomagnification: How Habitat selection explains beluga mercury levels.
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大小和生物放大：栖息地选择如何解释白鲸的汞含量。
DOI：
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发表时间：
2008
影响因子：
11.4
通讯作者：
S. Ferguson
中科院分区：
文献类型：
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作者：
L. Loseto;Gary A. Stern;S. Ferguson
1990年代期间，波弗特海白鲸(Delphinapterus Leucas)种群的汞含量有所增加；此后，汞含量有所下降，但仍高于1980年代。这些白鲸种群的饮食并不为人所知，因此很难评估饮食中汞的来源。在夏季，波弗特海白鲸根据栖息地的使用情况按长度、性别和生殖状况进行隔离，这可能会导致摄食差异，并最终吸收汞。为了验证这一假设，我们使用脂肪酸图谱检查白鲸的饮食变化，并确定哪些生物变量最能预测生物变量之间的饮食关系，并使用稳定同位素和肝脏和肌肉中的汞浓度进一步评估脂肪酸。肌肉中HG浓度与肝脏delta15N的相关性好于肌肉delta15N。比较了稳定同位素和脂肪酸在描述白鲸饮食汞过程方面的能力。脂肪酸为鲸鱼行为对食物汞摄取的影响提供了支持，而稳定的同位素则推断了组织汞的代谢率。在这里，我们表明，白鲸长度驱动饮食差异导致汞摄取的差异和生物放大过程主导白鲸汞水平随着时间的推移汞的生物积累。
Mercury (Hg) levels in the Beaufort Sea beluga (Delphinapterus leucas) population increased during the 1990s; levels have since declined but remain higher than the 1980s. The diet of this beluga population is not well-known, thus it is difficult to assess dietary Hg sources. During the summer, the Beaufort Sea belugas segregate by length, sex, and reproductive status corresponding to habitat use that may result in feeding differences and ultimately Hg uptake. To test this hypothesis, we examine beluga dietary variation using fatty acid profiles and determine which biological variables best predict diet Relationships between biological variables and fatty acids were further evaluated with stable isotopes and Hg concentrations in liver and muscle. Hg concentrations in muscle were better related to liver delta15N than muscle delta15N. Stable isotopes and fatty acids are compared in their ability to describe dietary Hg processes in beluga. Fatty acids provided support for influences of whale behavior on dietary Hg uptake, whereas stable isotopes inferred tissue Hg metabolic rates. Here, we show beluga length drives diet variability leading to differences in Hg uptake and biomagnification processes dominate beluga Hg levels over Hg bioaccumulation over time.
影响因子：
3.8
作者：
F. Farris;R. Dedrick;P. Allen;J. C. Smith
通讯作者：
F. Farris;R. Dedrick;P. Allen;J. C. Smith