Depth distribution of chironomids and an evaluation of site-specific and regional lake-depth inference models: a good model gone bad?
Depth distribution of chironomids and an evaluation of site-specific and regional lake-depth inference models: a good model gone bad?
复制标题
DOI：
10.1007/s10933-012-9628-z
复制
发表时间：
2012-06
影响因子：
2.1
通讯作者：
L. Cwynar;A. Rees;Cy R. Pedersen;S. Engels
中科院分区：
文献类型：
--
作者：
L. Cwynar;A. Rees;Cy R. Pedersen;S. Engels
我们使用了39个表面样本，从马塞拉湖，育空地区领土，研究摇蚊头部胶囊的分布与深度，并开发一个特定的网站（intralake）推理模型重建过去的湖泊水位。在表层沉积物样品中遇到的34个最常见的类群中，有10个与深度有很大关系。然后，我们应用特定地点的推理模型和先前开发的区域模型，从深，浅水岩心从马塞拉湖的样本。的推论进行了比较，一个独立的Digerfeldt型重建湖平面的历史和水分推断花粉数据。虽然特定地点的模型是好的，有更好的性能统计比区域模型，它是坏的深度重建，因为大多数样品从长岩心缺乏合适的类似物在特定地点的训练集。没有一个基于摇蚊的重建与Digerfeldt型重建很好地匹配。推断仍然来自摇蚊的深度模型，Digerfeldt型重建和花粉推断重建过去的水分制度之间的古水文推断。
We used 39 surface samples from Marcella Lake, Yukon Territory, to examine the distribution of chironomid head capsules in relation to depth and to develop a site-specific (intralake) inference model for reconstructing past lake levels. Ten of the 34 most-frequently occurring taxa encountered in the surface-sediment samples are significantly related to depth. We then applied the site-specific inference model and a previously developed regional model to samples from deep- and shallow-water cores from Marcella Lake. The inferences were compared to an independent Digerfeldt-type reconstruction of lake level history and to moisture inferences drawn from pollen data. Although the site-specific model was good in having better performance statistics than the regional model, it was bad at producing depth reconstructions because most samples from the long cores lacked suitable analogues in the site-specific training set. None of the chironomid-based reconstructions was a good match to the Digerfeldt-type reconstruction. Inconsistencies remain between the paleohydrological inferences derived from the chironomid depth models, the Digerfeldt-type reconstruction and pollen-inferred reconstructions of past moisture regimes.