气候变化领域集成服务门户(CCPortal): Macroalgal responses to ocean acidification depend on nutrient and light levels

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.848718
	Macroalgal responses to ocean acidification depend on nutrient and light levels
	Celis-Plá; Paula S M; Hall-Spencer; Jason M; Horta; Paulo Antunes; Milazzo; Marco; Korbee; Nathalie; Cornwall; Christopher Edward; Figueroa; Félix L
发布日期	2015-08-19
数据集类型	dataset
英文关键词	Benthos ; Biomass/Abundance/Elemental composition ; Chromista ; CO2 vent ; Coast and continental shelf ; Cystoseira compressa ; Field experiment ; Macroalgae ; Macro-nutrients ; Mediterranean Sea ; Ochrophyta ; Padina pavonica ; Primary production/Photosynthesis ; Single species ; Temperate ; Temperature
英文简介	Ocean acidification may benefit algae that are able to capitalize on increased carbon availability for photosynthesis, but it is expected to have adverse effects on calcified algae through dissolution. Shifts in dominance between primary producers will have knock-on effects on marine ecosystems and will likely vary regionally, depending on factors such as irradiance (light vs. shade) and nutrient levels (oligotrophic vs. eutrophic). Thus experiments are needed to evaluate interactive effects of combined stressors in the field. In this study, we investigated the physiological responses of macroalgae near a CO2 seep in oligotrophic waters off Vulcano (Italy). The algae were incubated in situ at 0.2 m depth using a combination of three mean CO2 levels (500, 700-800 and 1200 µatm CO2), two light levels (100 and 70% of surface irradiance) and two nutrient levels of N, P, and K (enriched vs. non-enriched treatments) in the non-calcified macroalga Cystoseira compressa (Phaeophyceae, Fucales) and calcified Padina pavonica (Phaeophyceae, Dictyotales). A suite of biochemical assays and in vivo chlorophyll a fluorescence parameters showed that elevated CO2 levels benefitted both of these algae, although their responses varied depending on light and nutrient availability. In C. compressa, elevated CO2 treatments resulted in higher carbon content and antioxidant activity in shaded conditions both with and without nutrient enrichment--they had more Chla, phenols and fucoxanthin with nutrient enrichment and higher quantum yield (Fv/Fm) and photosynthetic efficiency (alpha ETR) without nutrient enrichment. In P. pavonica, elevated CO2 treatments had higher carbon content, Fv/Fm, alpha ETR, and Chla regardless of nutrient levels--they had higher concentrations of phenolic compounds in nutrient enriched, fully-lit conditions and more antioxidants in shaded, nutrient enriched conditions. Nitrogen content increased significantly in fertilized treatments, confirming that these algae were nutrient limited in this oligotrophic part of the Mediterranean. Our findings strengthen evidence that brown algae can be expected to proliferate as the oceans acidify where physicochemical conditions, such as nutrient levels and light, permit.
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/216979
推荐引用方式 GB/T 7714	Celis-Plá,Paula S M,Hall-Spencer,et al. Macroalgal responses to ocean acidification depend on nutrient and light levels.2015-08-19.https://doi.org/10.1594/PANGAEA.848718.