Climate proxy optimization - quantifying factors controlling growth, geochemistry and micro/nanostructural design of bivalve mollusk shells

气候代理优化 - 量化控制双壳类软体动物壳生长、地球化学和微/纳米结构设计的因素

基本信息

批准号：
22258425
负责人：
Professor Dr. Bernd R. Schöne
金额：
--
依托单位：
Institut für Geowissenschaften
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2006
资助国家：
德国
起止时间：
2005-12-31 至 2010-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/22258425?language=en
关键词：
Climate proxy optimization quantifying factors

项目摘要

The planned project aims at a better understanding of the environmental and biological factors governing incremental growth, crystal structures and chemistry of bivalve mollusk shells. Bivalves are increasingly used as proxies of past climates. Yet, the underlying mechanisms of how bivalves actually record environmental conditions in their shells (growth rate, trace and minor element and isotope geochemistry, micro/nanostructural design) are poorly understood. Most models describing the relation between shell growth and environment were inductively inferred and not supported by experiments. The planned project will address this insufficiency by analyzing shell formation under natural and laboratory conditions. Main foci are (1) the timing at which bivalves accrete calcium carbonate to their shells, (2) the role of biological clocks and physiology in shell secretion, (3) factors that influence shell nanostructures and growth rate and (4) the chemical and stable isotopic composition of the shells in relation to that of the ambient water. Will growth rate and chemistry of the shells vary still if external factors remain constant (constant temperature, food supply, food quality, light etc.)? To what extent is shell growth, chemistry and crystal structures governed by biological clocks, physiology or physiochemical controls? Results of the planned study will significantly improve our understanding of how to interpret climate proxies preserved in shells of bivalve mollusks. It will help optimizing models on information retrieval and offer a means of quantifying (new) environmental proxies obtained from bivalve mollusk shells.

计划的项目旨在更好地了解有关双壳软体动物壳的增量生长，晶体结构和化学的环境和生物学因素。双壳类越来越多地用作过去气候的代理。然而，对双壳类动物如何实际记录其壳环境条件的基本机制（生长速率，痕量和次要元素以及同位素地球化学，微/纳米结构设计）知之甚少。描述壳生长与环境之间关系的大多数模型都是在实验中推断出的，并且不支持实验。计划的项目将通过分析自然和实验室条件下的壳形成来解决这种不足。主要灶是（1）双壳类钙钙碳酸钙与其壳的时机，（2）生物钟和生理学在壳体分泌中的作用，（3）影响壳纳米结构和生长速率的因素，以及（4）壳的化学且稳定的同位素组成与壳相对于气体水的壳。如果外部因素保持恒定（恒定温度，食物供应，食物质量，光线等），壳的生长速率和化学性会是否会有所不同吗？壳生长，化学和晶体结构在多大程度上受生物钟，生理或生理化学控制的影响？计划研究的结果将显着提高我们对如何解释双被软体动物壳中保存的气候代理的理解。它将有助于优化信息检索的模型，并提供一种从双壳类软体动物壳获得的量化（新）环境代理的方法。