Combined exposure to CO2 and H2S significantly reduces the performance of the Mediterranean seagrass Posidonia oceanica: Evidence from a volcanic vent

IF 5.1 2区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Letters Pub Date : 2024-05-22 DOI:10.1002/lol2.10368
Geraldina Signa, Valentina Sciutteri, Agostino Tomasello, Valentina Costa, Silvia Casabianca, Giovanna Cilluffo, Cristina Andolina, Salvatrice Vizzini
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Abstract

Although seagrasses are expected to thrive in future acidified oceans by overcoming low CO2 diffusion into plant tissues, the co-occurrence of environmental stressors may affect their growth. Volcanic CO2 vents are often associated with toxic gases and metal-rich fluids representing ideal sites to assess the effects of multiple stressors. We evaluated the response of Posidonia oceanica growing near shallow CO2 vents characterized by H2S spill-out by comparing meadow structure and phenology to an area with no gas emissions. Seagrass descriptors at meadow, shoot and leaf level indicated that P. oceanica experienced stressful conditions at the vent area, in clear contrast to the flourishing features of P. oceanica previously described at CO2 vents with no evidence of toxic inputs. Furthermore, the reduction in both leaf δ34S and growth at the vent area indicates that sulfide intrusion occurs and affects seagrass growth performance, dampening the expected beneficial effects of high CO2 levels.

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在二氧化碳和 H2S 的双重作用下,地中海海草 Posidonia oceanica 的表现明显降低:来自火山喷口的证据
尽管海草有望通过克服低二氧化碳扩散到植物组织中的问题,在未来酸化的海洋中茁壮成长,但同时存在的环境压力因素可能会影响它们的生长。火山二氧化碳喷口通常伴有有毒气体和富含金属的液体,是评估多种压力因素影响的理想场所。我们评估了生长在以 H2S 溢出为特征的浅层二氧化碳喷口附近的 Posidonia oceanica 的反应,将草甸结构和物候学与没有气体排放的区域进行了比较。海草在草甸、嫩枝和叶片层面的描述指标表明,P. oceanica 在排放口区域经历了压力条件,这与之前描述的 P. oceanica 在无有毒物质输入证据的二氧化碳排放口的繁盛特征形成了明显对比。此外,排放口区域叶片δ34S 和生长量的减少表明,硫化物侵入会影响海草的生长性能,从而削弱高二氧化碳水平预期产生的有益影响。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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