Montana Fish, Wildlife & Parks, P.O. Box 200701, Helena, MT, 59620-0701, USA.
U.S. Geological Survey, South Dakota Cooperative Fish and Wildlife Research Unit, Department of Natural Resource Management, South Dakota State University, Brookings, SD, 57007, USA.
Arch Environ Contam Toxicol. 2019 Oct;77(3):336-343. doi: 10.1007/s00244-019-00658-1. Epub 2019 Aug 5.
We collected Walleye Sander vitreus (May-October) from Bitter and Twin lakes, South Dakota to assess seasonal- and diet-related variation in tissue mercury (Hg) concentration. The average Hg concentration in Walleye was 43-68% higher in the spring for Bitter (p < 0.008) and Twin Lakes (p < 0.017) compared with summer or autumn months. Bioenergetics analysis of Bitter Lake Walleye showed that consumption of fish prey (primarily Fathead Minnow Pimephales promelas) increased from late summer through winter and was linked to increased Hg accumulation in Walleye the following spring. Mercury concentration varied significantly with Walleye age but was similar for comparably-aged male (0.62 μg/g) and female fish (0.62 μg/g). However, after adjusting for Walleye size (total length, mm), mean Hg concentration was greater in male (0.66 μg/g) compared with female (0.50 μg/g) fish, likely due to slower growth rate of male Walleye. At 425 mm, male Walleye in Bitter Lake were approximately 1 year older than female fish. These findings show that diet, age, and gender-related growth affect Hg concentration in Walleye and are important factors to consider in fish contaminant monitoring programs.
我们从南达科他州的苦味湖和双子湖收集了白鲈（五月至十月），以评估组织汞（Hg）浓度的季节性和饮食相关变化。与夏季或秋季相比，苦味湖和双子湖白鲈春季的平均 Hg 浓度高出 43-68%（p<0.008 和 p<0.017）。苦味湖白鲈的生物能量分析表明，从夏末到冬季，鱼类猎物（主要是黑头呆鱼 Pimephales promelas）的消耗增加，这与次年春季白鲈中 Hg 积累增加有关。Hg 浓度与白鲈年龄显著相关，但同龄的雄性（0.62μg/g）和雌性鱼（0.62μg/g）相似。然而，在调整白鲈大小（总长度，mm）后，雄性（0.66μg/g）的平均 Hg 浓度高于雌性（0.50μg/g）鱼，这可能是由于雄性白鲈的生长速度较慢。在 425mm 时，苦味湖的雄性白鲈比雌性鱼大约年长 1 岁。这些发现表明，饮食、年龄和性别相关的生长会影响白鲈中的 Hg 浓度，这是鱼类污染物监测计划中需要考虑的重要因素。
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