High-resolution records of environmental change in cold-water coral reefs: geochemical evidence recorded in the skeleton of the marine bivalve Acestaexcavata

冷水珊瑚礁环境变化的高分辨率记录：海洋双壳类 Acestaexcavata 骨骼中记录的地球化学证据

• 批准号: 383168872
• 负责人: Privatdozent Dr. Jacek Raddatz
• 金额: --
• 依托单位: Institut für Geowissenschaften (IfG)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/383168872?language=en
• 关键词: resolution; records; environmental; change; cold

The current rise in atmospheric pCO2 and temperature is a serious threat for marine calcifiers in deep sea ecosystems. Among these, cold-water coral (CWC) ecosystems appear to be under particular risk due to their position in cold and deep waters close to the limit of carbonate saturation. One factor poorly explored for the growth of CWC reefs is seasonality. Moreover, to date geochemical research on CWC is mainly focused on framework building corals as environmental archives for which severe vital effects are known. Here, we explore a promising alternative model organism, the large clam Acesta excavata, as a new environmental archive for CWC reef ecosystems. A series of geochemical proxies already established in other marine biogenic carbonates will be applied with a suite of analytical methods and different sampling techniques. In addition, the geochemical data will be calibrated for the first time to high-resolution in situ oceanographic data (logged via >1 year lander deployments at the sample sites). This integrated approach aims to: (1) identify and evaluate potential vital effects of A. excavata, (2) assess A. excavata as paleoceanographic archive for geochemical proxies and age chronometers, (3) resolve temporal and spatial variations of seasonality in CWC reefs off Norway (Trondheimsfjord (Leksa Reef) and off-shore Sula Reef) and Mauretania (BandaMounds), and finally (4) address the role of seasonality in the context of shifts in CWC reef occurrencesat high and low latitudes on glacial/ interglacial time scales.

目前大气pCO 2和温度的上升对深海生态系统中的海洋钙化生物构成严重威胁。其中，冷水珊瑚生态系统由于位于接近碳酸盐饱和极限的冷水和深水沃茨中，似乎面临特别的风险。对CWC珊瑚礁生长的一个探索不足的因素是季节性。此外，迄今为止，对《化学武器公约》的地球化学研究主要集中在作为环境档案的框架建筑珊瑚上，已知这些珊瑚会产生严重的生命影响。在这里，我们探索一个有前途的替代模式生物，大蛤Acesta encrominata，作为一个新的环境档案CWC珊瑚礁生态系统。将采用一套分析方法和不同的采样技术，应用在其他海洋生物碳酸盐中已经建立的一系列地球化学替代指标。此外，地球化学数据将首次按照高分辨率的原地海洋学数据（通过在采样点部署一年以上的着陆器记录）进行校准。该方法的主要目的是：（1）识别和评价A.（2）评价A.挖掘作为地球化学代理和年龄计时器的古海洋学档案，（3）解决挪威（特隆赫姆峡湾（Leksa礁）和离岸苏拉礁）和毛里塔尼亚（BandaMounds）的CWC礁的季节性的时间和空间变化，最后（4）解决的CWC礁发生在冰川/间冰期时间尺度上的高纬度和低纬度的变化的背景下的季节性的作用。