气候变化领域集成服务门户(CCPortal): Dolomite-rich coralline algae in reefs resist dissolution in acidified conditions

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.825092
	Dolomite-rich coralline algae in reefs resist dissolution in acidified conditions
	Nash; Merinda C; Opdyke; Bradley N; Troitzsch; U; Russell; Bayden D; Adey; W H; Kato; A; Diaz-Pulido; Guillermo; Brent; C; Gardner; M; Prichard; J; Kline; David I
发布日期	2012-12-27
数据集类型	dataset
英文关键词	Benthos ; Bottles or small containers/Aquaria ( 20 L) ; Calcification/Dissolution ; Coast and continental shelf ; Laboratory experiment ; Macroalgae ; Plantae ; Porolithon onkodes ; Rhodophyta ; Single species ; South Pacific ; Temperate
英文简介	Coral reef ecosystems develop best in high-flow environments but their fragile frameworks are also vulnerable to high wave energy. Wave-resistant algal rims, predominantly made up of the crustose coralline algae (CCA) Porolithon onkodes and P. pachydermum, are therefore critical structural elements for the survival of many shallow coral reefs. Concerns are growing about the susceptibility of CCA to ocean acidification because CCA Mg-calcite skeletons are more susceptible to dissolution under low pH conditions than coral aragonite skeletons. However, the recent discovery of dolomite (Mg0.5Ca0.5(CO3)), a stable carbonate, in P. onkodes cells necessitates a reappraisal of the impacts of ocean acidification on these CCA. Here we show, using a dissolution experiment, that dried dolomite-rich CCA have 6-10 times lower rates of dissolution than predominantly Mg-calcite CCA in both high-CO2 (~ 700 ppm) and control (~ 380 ppm) environments, respectively. We reveal this stabilizing mechanism to be a combination of reduced porosity due to dolomite infilling and selective dissolution of other carbonate minerals. Physical break-up proceeds by dissolution of Mg-calcite walls until the dolomitized cell eventually drops out intact. Dolomite-rich CCA frameworks are common in shallow coral reefs globally and our results suggest that it is likely that they will continue to provide protection and stability for coral reef frameworks as CO2 rises.
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/217569
推荐引用方式 GB/T 7714	Nash,Merinda C,Opdyke,et al. Dolomite-rich coralline algae in reefs resist dissolution in acidified conditions.2012-12-27.https://doi.org/10.1594/PANGAEA.825092.