Dynamik benthischer Ökosystemfunktionen in Abhängigkeit des Schelfeis-Zerfalls im westlichen Weddellmeer

威德尔海西部海底生态系统功能随冰架衰退的动态变化

基本信息

批准号：
238058495
负责人：
Dr. Heike Link
金额：
--
依托单位：
Fachbereich Biowissenschaften
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/238058495?language=en
关键词：
Dynamik benthischer kosystemfunktionen Abh ngigkeit

项目摘要

The Larsen ice shelves east of the Antarctic Peninsula have been retreating rapidly, thus subjecting the manne ecosystem of the western Weddell Sea (Larsen areas A and B) to dramatic changes in environmental conditions: open water allows for higher primary production, higher export of organic matter to the seafloor, and äs a consequence, the seabed has been recolonized at many sites by rieh benthic communities. These differ frorn the impoverished assemblages found in oligotrophic conditions under the ice shelves, which raises the question, how the pronounced changes in benthic food supply and community composition may have influenced benthic ecosystem functioning (BEF)? Important BEF components are the degradation of organic matter and the associated remineralization of carbon and inorganic nutrients. Little is known about this issue in polar regions, and even less how these benthic processes have and will change in response to the continuing retreat of Antarctic ice shelves. This project therefore aims to (1) give a first quantification and (2) determine changes of benthic boundary fluxes on the Larsen shelf after loss of ice shelves (A and B) related to changes in organic matter on the seabed and community composition and (3) evaluate future changes of benthic boundary fluxes on the entire Larsen shelf (A, B, and C) using an experimental approach. As part of the 'Larsen Shelf Study of the Ocean' (LASSO), the outcome of this project will lead to a conceptual model describing the effects of ice shelf retreat on the benthic ecosystems in the Larsen region.

The Larsen ice shelves east of the Antarctic Peninsula have been retreating rapidly, thus subjecting the manne ecosystem of the western Weddell Sea (Larsen areas A and B) to dramatic changes in environmental conditions: open water allows for higher primary production, higher export of organic matter to the seafloor, and a consequence, the seabed has been recognized at many sites by rieh benthic communities.这些不同的弗雷恩（Frorn）在冰架下发现的贫困条件下发现的贫困组合提出了一个问题，即底栖食品供应和社区组成的明显变化可能影响了底栖生态系统功能（BEF）？重要的BEF组成部分是有机物的降解以及碳和无机养分的相关再矿化。在极地地区，对这个问题知之甚少，甚至不太了解这些底栖过程的方式，并且会随着南极冰架的持续撤退而改变。因此，该项目的目的是（1）进行首次量化，（2）确定与海床和社区组成的有机物变化相关的冰架（a和b）后，拉尔森架子和社区组成的变化以及（3）评估整个Larsen架子（A，B和C）使用实验方法来评估未来的底栖边界磁通变化的变化。作为“海洋Larsen货架研究”（Lasso）的一部分，该项目的结果将导致一个概念模型，描述了冰架撤退对拉尔森地区底栖生态系统的影响。