Paleoclimate and paleoecology of the northern lowland Neotropics, Phase I and II: Limnological survey of modern aquatic environments and paleoclimate reconstructions from fossil species assemblages recovered by the Lago Petén Itzá Scientific Drilling Proj

我们建议在整个半岛进行第二次湖泊调查（2007年2月至3月），以完成我们从2005/2006年第一次野外调查中收集的生态、水生地球化学和湖泊数据开始建立的训练集。这是必要的，因为我们需要一个统计上可靠的数据库，由至少50个湖泊的数据组成。这将允许(1)恢复我们对Lago pet<s:1> <s:1>科学钻探项目（PISDP）的第一阶段贡献，即现代水生环境的湖沼学调查，以及(2)将传递函数和干扰统计应用于介形类和手摇类的物种组合（硅藻和枝洋类正在由合作伙伴分析）。钙质介形虫阀的稳定氧和碳同位素以及水生地球化学数据，以便建立训练集，用于解释2005年pet<s:1>伊茨海姆湖湖沼学调查期间从短岩心中恢复的化石物种组合。我们还建议开始第二阶段，对2006年2月至3月从佩特海姆伊茨<e:1>湖回收的第一批长岩心样本进行化石物种组合的分析和解释。

We propose a second field campaign of a limnological survey (February-March 2007) across the Peninsula Yucatán in order to complete the training set that we started to build from ecological, aquatic geochemical and limnological data collected during the first field campaign in 2005/2006. This is necessary because we need a statistically sound database, consisting of data from a minimum of 50 lakes. This will allow to (1) resume Phase I of our contribution to the Lago Petén Itzá Scientific Drilling Project (PISDP), the limnological survey of modern aquatic environments, and (2) to apply transfer functions and interference statistics to species assemblages of ostracodes and chironomids (diatoms and cladocerans are being analyzed by cooperation partners), stable oxygen and carbon isotopes of calcareous ostracode valves as well as aquatic geochemical data in order to build training sets for the interpretation of fossil species assemblages recovered from short cores taken during the limnological survey in Lake Petén Itzá in 2005. We also propose to start Phase II, the analysis and interpretation of fossil species assemblages with a first set of samples from long cores recovered from Lake Petén Itzá in February-March 2006.