气候变化领域集成服务门户(CCPortal): Seawater carbonate chemistry and carbon and nitrogen allocation strategy in Posidonia oceanica

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.890444
	Seawater carbonate chemistry and carbon and nitrogen allocation strategy in Posidonia oceanica
	Scartazza; Andrea; Moscatello; Stefano; Gavrichkova; Olga; Buia; Maria-Cristina; Lauteri; Marco; Battistelli; Alberto; Lorenti; Maurizio; Garrard; Samantha Laird; Calfapietra; Carlo; Brugnoli; Enrico
发布日期	2018-05-29
数据集类型	dataset
英文关键词	Benthos ; Biomass/Abundance/Elemental composition ; CO2 vent ; Coast and continental shelf ; Field observation ; Mediterranean Sea ; Mediterranean Sea ; Plantae ; Posidonia oceanica ; Seagrass ; Single species ; Temperate ; Tracheophyta
英文简介	Rising atmospheric CO2 causes ocean acidification that represents one of the major ecological threats for marine biota. We tested the hypothesis that long-term exposure to increased CO2 level and acidification in a natural CO2 vent system alters carbon (C) and nitrogen (N) metabolism in Posidonia oceanica L. (Delile), affecting its resilience, or capability to restore the physiological homeostasis, and the nutritional quality of organic matter available for grazers. Seawater acidification decreased the C to N ratio in P. oceanica tissues and increased grazing rate, shoot density, leaf proteins and asparagine accumulation in rhizomes, while the maximum photochemical efficiency of photosystem II was unaffected. The 13C-dilution in both structural and non-structural C metabolites in the acidified site indicated quali-quantitative changes of C source and/or increased isotopic fractionation during C uptake and carboxylation associated with the higher CO2 level. The decreased C:N ratio in the acidified site suggests an increased N availability, leading to a greater storage of 15N-enriched compounds in rhizomes. The amount of the more dynamic C storage form, sucrose, decreased in rhizomes of the acidified site in response to the enhanced energy demand due to higher shoot recruitment and N compound synthesis, without affecting starch reserves. The ability to modulate the balance between stable and dynamic C reserves could represent a key ecophysiological mechanism for P. oceanica resilience under environmental perturbation. Finally, alteration in C and N dynamics promoted a positive contribution of this seagrass to the local food web.
空间范围	Latitude: 40.730170 * Longitude: 13.966330
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/216167
推荐引用方式 GB/T 7714	Scartazza,Andrea,Moscatello,et al. Seawater carbonate chemistry and carbon and nitrogen allocation strategy in Posidonia oceanica.2018-05-29.https://doi.org/10.1594/PANGAEA.890444.