SGER: Oxygen Minimum Zone Control of Benthic Processes on the Peru-Chile Margin: El Nino Influence

小行星9803861 底栖生物资源（低氧、高食物）的极端集中出现在最低含氧区，从技术上讲，最低含氧区是指氧浓度低于0.5毫升/升的区域。 中层水氧极小区在东太平洋非常发达，并沿沿着美洲截取大部分大陆边。 这也是世界海洋的一个区域，在那里，水文地理和大洋隔离带的强度受到ENSO等年代际气候变化的严重影响。 我们提出了一个多学科的调查，沉积物地球化学，生物扰动，细菌，有孔虫，后生动物，和鱼鳞内和下的OMZ沉积物。 这些组件的强烈影响的氧化水平，其变化显着期间，E1 Ni o和La Ni a条件。 该提案要求种子基金的方案，以测试假设氧气最低区的影响，底栖陆架和斜坡社区关闭秘鲁和智利，并在何种程度上E1 Ni O相关的事件修改底栖群落的过程。 研究结果将与墨西哥、加州和俄勒冈州其他低氧环境（有机混合区和甲烷渗漏）正在进行的底栖生物过程研究进行比较。 这一努力将促进对非生物因素和海底过程之间关系的了解，这对于准确评价现代和古代（古）环境、自然人口周期和沿海海洋资源管理至关重要。 该计划将涉及美国（斯克里普斯），智利（孔塞普西翁大学）和秘鲁（IMARPE）科学家的参与。

9803861 Levin Extreme concentrations of resources (low oxygen, high food) for benthic organisms occur in oxygen minimum zones (OMZs), technically defined as regions where oxygen concentrations fall below 0.5 ml/1. Midwater oxygen minima are strongly developed in the eastern Pacific Ocean and intercept much of the continental margin along the Americas. This is also a region of the world ocean where hydrography and the intensity of the OMZ are heavily affected by interdecadal climate change such as ENSO. We propose a multidisciplinary investigation of sediment geochemistry, bioturbation, bacteria, foraminifera, metazoans, and fish scales in sediments within and beneath the OMZ. These components are strongly affected by oxygenation level, which varies significantly during, E1 Ni o and La Ni a conditions. This proposal requests seed funds for a program to test hypotheses about oxygen minimum zone influence on benthic shelf and slope communities off Peru and Chile, and the extent to which E1 Ni o-related events modify benthic community processes. Results will be compared to ongoing studies of benthic processes in other low oxygen settings (OMZs and methane seeps) off Mexico, California and Oregon. This effort will advance understanding of relationships among abiotic factors and benthic processes that are critical to accurate evaluations of modern and ancient (paleo-) environments, natural population cycles and management of coastal marine resources. The program will involve participation of US (Scripps), Chilean (University de Concepcion), and Peruvian (IMARPE) scientists.