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

9803861莱文底栖生物资源的极端集中(低氧、高食物)出现在最低含氧区(OMZ)，技术上定义为含氧量降至0.5ml/l以下的区域。水中最低含氧量在东太平洋强烈发育，并拦截沿美洲的大部分大陆边缘。这也是世界海洋的一个区域，在那里，水文地貌和OMZ的强度受到年代际气候变化的严重影响，例如ENSO。我们建议对OMZ内部和下方的沉积物中的沉积物地球化学、生物扰动、细菌、有孔虫、后生动物和鱼鳞进行多学科调查。这些组分受到氧合水平的强烈影响，在E1Nio和LaNia条件下，氧合水平变化很大。这项提案要求为一个项目提供种子资金，以测试有关氧气最小地带对秘鲁和智利近海海底陆架和斜坡群落的影响的假说，以及与厄尔尼诺事件相关的事件在多大程度上改变了海底群落的过程。结果将与墨西哥、加利福尼亚州和俄勒冈州附近其他低氧环境(OMZ和甲烷渗漏)下正在进行的海底过程研究进行比较。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，这对于准确评估现代和古代(古)环境、自然人口周期和管理沿海海洋资源至关重要。该计划将涉及美国(斯克里普斯)、智利(康塞普西翁大学)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.