Benthic macroinvertebrate and fish communities in Lake Huron are linked to submerged groundwater vents
Benthic macroinvertebrate and fish communities in Lake Huron are linked to submerged groundwater vents
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休伦湖的底栖大型无脊椎动物和鱼类群落与淹没的地下水喷口有关
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
S. Nold
中科院分区：
文献类型：
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作者：
T. G. Sanders;B. Biddanda;C. A. Stricker;S. Nold
地下水可以是水生生态系统营养和能量的重要来源，但量化输入和生物地球化学的重要性仍然具有挑战性。对休伦湖北方一系列淹没地下水喷口进行了检查，以确定地下水营养物质和水生食物网之间的联系。我们收集了地下水喷口和参考栖息地的关键食物网成分的样品，并分析了它们的13 C，15 N和34 S同位素。地下水中溶解无机碳（DIC）在13 C中亏损，而含水硫酸盐在34 S中富集（地下水与参考点之间的平均差异分别为-3.9‰和+12.0‰）。与参考点相比，地下水环境中底栖初级生产者、大型无脊椎动物和底栖鱼类的δ 13 C值明显较低，而底栖鱼类的δ 34 S值有所减少（-2.5‰）。但地下水和参考点的δ 15 N值没有差异，生态系统中浮游生物、浮游鱼类和鱼类的δ 13 C和δ 15 N值相似。这些数据表明，地下水喷口周围的底栖后生动物群落与地下水衍生的底栖生物初级生产部分相关，而与底栖生物没有直接关系的食鱼和食肉群落不依赖于地下水营养。
Groundwater can be an important source of nutrients and energy to aquatic ecosystems, but quantifying the inputs and biogeochemical importance remains challenging. A series of submerged ground- water vents in northern Lake Huron were examined to determine the linkage between groundwater nutrients and aquatic food webs. We collected samples of key food-web components from groundwater vent and reference habitats and analyzed them for 13 C, 15 N, and 34 S isotopes. Dissolved inorganic carbon (DIC) in the groundwater was depleted in 13 C, while aqueous sul- fate was enriched in 34 S (mean differences between groundwater and reference sites were -3.9‰ and +12.0‰, respectively). Benthic primary producers, macroinvertebrates, and benthivorous fish had signifi- cantly lower δ 13 C values in groundwater environ- ments, and benthivorous fish were somewhat depleted (-2.5‰) in δ 34 S at groundwater sites compared to ref- erence sites. However, δ 15 N values were not different between groundwater and reference sites, and pelagic components of the ecosystems (plankton and planktiv- orous and piscivorous fish) were similar in both δ 13 C and δ 15 N. These data suggest benthic metazoan com- munities surrounding groundwater vents are partially linked to groundwater-derived benthic primary pro- duction, while planktivorous and piscivorous commu- nities not directly associated with the benthos do not rely on groundwater nutrients.