Grandlic Christopher J, Geib Ian, Pilon Renee, Sandrin Todd R
Department of Biology and Microbiology, University of Wisconsin Oshkosh, 800 Algoma Blvd, 142 Halsey Science Center, Oshkosh, WI 54901, USA.
Environ Pollut. 2006 Nov;144(1):119-26. doi: 10.1016/j.envpol.2005.12.029. Epub 2006 Feb 28.
Rush Lake (WI, USA), the largest prairie-pothole lake east of the Mississippi River, has been contaminated with lead pollution as a result of over 140 years of waterfowl hunting. We examined: (1) the extent of lead pollution in Rush Lake sediments and (2) whether lead pollution in Rush Lake is affecting the abundance and community structure of indigenous sediment bacteria. Sediment lead concentrations did not exceed 59 mg Pb kg(-1) dry sediment. No relationship was observed between sediment lead concentration and the abundance of aerobic (P=0.498) or anaerobic (P=0.416) heterotrophic bacteria. Similarly, lead did not appear to affect bacterial community structure when considering both culturable and nonculturable community members. In contrast, the culturable fraction of sediment bacteria in samples containing 59 mg Pb kg(-1) exhibited a unique community structure. While factors other than lead content likely play roles in determining bacterial community structure in the sediments of Rush Lake, these data suggest that the culturable fraction of sediment bacterial communities is affected by elevated lead levels.
拉什湖（美国威斯康星州）是密西西比河以东最大的草原坑洼湖，由于140多年的水禽狩猎活动，已受到铅污染。我们研究了：（1）拉什湖沉积物中铅污染的程度，以及（2）拉什湖的铅污染是否正在影响本地沉积物细菌的丰度和群落结构。沉积物铅浓度不超过59毫克铅/千克干沉积物。在沉积物铅浓度与好氧（P = 0.498）或厌氧（P = 0.416）异养细菌的丰度之间未观察到相关性。同样，在考虑可培养和不可培养的群落成员时，铅似乎并未影响细菌群落结构。相比之下，含59毫克铅/千克的样品中沉积物细菌的可培养部分呈现出独特的群落结构。虽然除铅含量外的其他因素可能在决定拉什湖沉积物中细菌群落结构方面发挥作用，但这些数据表明，沉积物细菌群落的可培养部分受到铅水平升高的影响。
