期刊
JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY
卷 552, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jembe.2022.151740
关键词
CO2 sequestration; COI-5P; CO2 enrichment; Decreased pH; Physiological responses
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq/BR) [312355/2019-0, 304899/2017-8]
The study reveals that fleshy macroalgae from different biogeographic provinces in Brazil show tolerance to ocean acidification and increased CO2 levels, allowing them to thrive in lower pH environments.
Increasing oceanic CO2 has caused a decrease in oceanic pH, a process termed ocean acidification (OA). OA may benefit fleshy macroalgae due to the increased availability of inorganic carbon sources for photosynthesis since they are tolerant of decreases in pH. In this study, we analyzed multiple physiological responses of Bostrychia montagnei and Bostrychia calliptera from two biogeographic provinces of Brazil (Tropical Southwestern Atlantic [TSA] and Warm Temperate Southwestern Atlantic [WTSA]) after culturing them at a set of bioreactors in three pH levels (7.2, 7.6, and 8.0). Two pH were decreased by CO2 enrichment into the culture medium. Molecular analyses using plastidial (rbcL-3P) and mitochondrial (COI-5P) DNA markers were also performed to identify genetic divergences between macroalgae from TSA and WTSA. Molecular evidence of COI-5P marker demonstrated that the specimens of both B. montagnei and B. calliptera from TSA and WTSA constitute different haplotypes, with a strong segregation between them. Macroalgae from both localities increased their growth in treatments of decreased pH with increased CO2 availability. Overall, physiological responses of the algae were not negatively affected by decreased pH. B. montagnei from TSA increased its polysaccharide and allophycocyanin content at pH 7.2, and B. montagnei from WTSA increased its low molecular weight carbohydrate content at pH 7.2 as well. Antioxidant activity - a proxy for physiological stress - was not affected by decreased pH. Our study indicates that haplotypes of B. montagnei and B. calliptera from TSA and WTSA can be relevant to CO2 sequestration in mangroves once they are tolerant of decreased pH and increase their growth under increased CO2 availability.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据