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.

该计划项目旨在更好地了解控制双壳类软体动物壳增量生长、晶体结构和化学的环境和生物因素。双壳类动物越来越多地被用作过去气候的代表。然而，人们对双壳类如何在其壳中实际记录环境条件（生长率、微量元素和微量元素以及同位素地球化学、微/纳米结构设计）的基本机制知之甚少。大多数描述贝壳生长与环境之间关系的模型都是归纳推断的，没有得到实验的支持。计划中的项目将通过分析自然和实验室条件下的贝壳形成来解决这一不足。主要焦点是（1）双壳类将碳酸钙积累到其壳上的时间，（2）生物钟和生理学在壳分泌中的作用，（3）影响壳纳米结构和生长速率的因素以及（4）化学和贝壳的稳定同位素组成与环境水的同位素组成有关。如果外部因素保持不变（恒温、食物供应、食物质量、光照等），贝壳的生长速度和化学成分还会变化吗？贝壳生长、化学和晶体结构在多大程度上受生物钟、生理学或理化控制的控制？计划中的研究结果将显着提高我们对如何解释双壳类软体动物壳中保存的气候指标的理解。它将有助于优化信息检索模型，并提供一种量化从双壳类软体动物壳获得的（新）环境代理的方法。