Environmental and Industrial Safety Section, Safety Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, Tamil Nadu, India.
Environ Monit Assess. 2010 Apr;163(1-4):185-94. doi: 10.1007/s10661-009-0826-8. Epub 2009 Mar 6.
Impact of thermal discharge from a coastal power station (Madras Atomic Power Station, southeast coast of India) on the spatial variability of Donax cuneatus abundance was assessed to determine the impact boundary. Totally, 20 sites were selected both on south and north side in increasing spatial scale from mixing zone, 12 locations were selected toward south side at a distance from 0 (near mixing point) to 2,000 m and eight location were selected toward north from the effluent mixing zone. Mean water temperature along the coast ranged from 29.1 +/-0.15 degrees C to 31.2 +/- 0.15 degrees C. Total organic carbon content in the sediment ranged from 0.27% to 0.70%. D. cuneatus population on the swash zone was ranged between 1.3 +/- 1.5 and 88.3 +/- 9.6 m(-2). Meager population of wedge clam was observed up to 100 m (S100) south from mixing point and abundance gradually increased in different spatial scale. Comparatively high abundance was observed from S400 and reached maximum at S1000 (64.0 +/- 3.6 m(-2)). Similar pattern was observed on north side too but less abundance was observed only up to 80 m (N80). Maximum abundance was observed at control location C3-N500 (88.3 +/- 9.6 m(-2)). Forty meters on either side of discharge point was highly impacted, 80 to 100 m toward plume flow (south) was moderately impacted, and 80 m north of mixing point also witnessed moderate impact. After 100 m (N100), north was not affected by effluents, whereas between 100 and 400 m, south was influenced slightly. Multivariate clustering pattern on the environmental variables of all sampling locations and population trend of D. cuneatus at those stations showed similarity. Present investigation unambiguously showed that the abundance pattern of D. cuneatus on the sandy beach of east coast of Kalpakkam is not governed by single major factor but due to the result of multiple interacting factors. The population size of the wedge clam with reference to the effect of power plant effluents and other features of habitats of the beach ecosystem are also discussed.
评估了位于印度东南海岸马德拉斯核电站（Madras Atomic Power Station）附近的沿海电站的热排放对锯齿厚壳贻贝（Donax cuneatus）丰度空间变化的影响，以确定影响边界。总共在混合区的南侧和北侧选择了 20 个站点，在从混合区开始的增加的空间尺度上，向南侧选择了 12 个位置，距离为 0（靠近混合点）至 2000 米，从排放混合区向北侧选择了 8 个位置。沿海岸线的平均水温范围为 29.1 +/- 0.15 摄氏度至 31.2 +/- 0.15 摄氏度。沉积物中的总有机碳含量范围为 0.27%至 0.70%。冲刷带的锯齿厚壳贻贝种群数量范围为 1.3 +/- 1.5 至 88.3 +/- 9.6 m(-2)。在混合点以南 100 米（S100）处观察到楔形蛤的稀少种群，并且在不同的空间尺度上丰度逐渐增加。在 S400 处观察到相对较高的丰度，在 S1000 处达到最大值（64.0 +/- 3.6 m(-2)）。在北侧也观察到类似的模式，但仅在 80 米（N80）处观察到较少的丰度。在对照位置 C3-N500（88.3 +/- 9.6 m(-2)）处观察到最大丰度。排放点两侧 40 米处受到高度影响，向羽流流动（南侧）的 80 至 100 米处受到中度影响，混合点以北 80 米处也受到中度影响。在 100 米（N100）之后，北方不受废水影响，而在 100 至 400 米之间，南方受到轻微影响。所有采样地点的环境变量的多元聚类模式和这些站点的锯齿厚壳贻贝的种群趋势显示出相似性。目前的调查清楚地表明，Kalpakkam 东海岸沙滩上锯齿厚壳贻贝的丰度模式不是由单一主要因素决定的，而是由于多个相互作用因素的结果。还讨论了楔形蛤的种群大小与电厂废水的影响以及沙滩生态系统栖息地的其他特征之间的关系。
