LTREB: Continuing Assessment of Ecological Recovery Following Experimental Acidification of Little Rock Lake, Wisconsin

LTREB：威斯康星州小石湖实验酸化后生态恢复的持续评估

• 批准号: 9815519
• 负责人: Timothy Kratz
• 金额: $ 11.76万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-04-15 至 2002-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9815519&HistoricalAwards=false
• 关键词: LTREB; Continuing; Assessment; Ecological; Recovery

Little Rock Lake in northern Wisconsin has been the site of a whole-lake acidification experiment since 1983. The lake was divided into a reference basin that was left unmodified and a treatment basin that was acidified between 1985 and 1990. During the three, 2-year phases of increasing acidification, the PIs documented a wide range of responses to the acid additions. Since 1991, the PIs have been evaluating the natural capacity of the lake to recover from the direct and indirect effects of acidification. The lake has largely returned to pre-acidified chemical conditions. By spring 1995, the lake's pH was close to the 6.1 value that occurred prior to the manipulation. In contrast, some biological characteristics of the lake exhibited a substantially slower recovery. In particular, through 1996, the taxonomic composition of the treatment basin's zooplankton community remained different from the community occurring in the reference basin. By 1997, however, there were signs that the zooplankton were beginning to be similar in the treatment and reference basins. This project will complete the PIs evaluation of Little Rock Lake's recovery and test the hypothesis that the treatment basin's zooplankton community will be essentially the same as that in the reference basin in 1999 and 2000, 9 and 10 years following the last acid additions. The PIs will also evaluate an analytical technique to distinguish whether the zooplankton community in the treatment basin has formed a long-standing community distinctly different from that in the reference basin or if there was a delayed response in its recovery. Large-scale experiments such as the Little Rock Lake project operate at an interface between applied and theoretical ecology. Completing the PIs evaluation of the lake's recovery will allow the PIs to complete the documentation of Little Rock Lake's full range of reactions to acidification and to evaluate some of the basic processes that control long-term dynamics in lakes.

自1983年以来，威斯康星州北部的小石湖一直是全湖酸化实验的地点。该湖被分为一个参考盆地，该盆地未经修饰，并在1985年至1990年之间进行了酸化的治疗盆地。在增加酸化的三年，两年阶段，PIS记录了对酸添加的广泛响应。 自1991年以来，PI一直在评估湖泊从酸化的直接和间接作用中恢复的自然能力。 该湖在很大程度上恢复了预鉴定的化学条件。 到1995年春季，该湖的pH值接近操纵前发生的6.1值。 相反，湖泊的某些生物学特征表现出较慢的恢复。 特别是，到1996年，盆地浮游动物社区的分类学组成与参考盆地中发生的社区不同。 然而，到1997年，有迹象表明，浮游动物在治疗和参考盆地中开始变得相似。 该项目将完成对Little Rock Lake恢复的PIS评估，并检验以下假设：治疗盆地的浮游动物社区基本上将与1999年和2000年的参考盆地中的9和10年相同。 PI还将评估一种分析技术，以区分治疗盆地中的浮游动物社区是否形成了一个与参考盆地中的长期社区明显不同，或者其恢复的反应延迟。小石城项目等大型实验在应用与理论生态学之间的界面上运行。 完成对湖泊恢复的PIS评估将使PI完成Little Rock Lake对酸化的全部反应的文档，并评估控制湖泊长期动态的一些基本过程。