红树林沉积物上的马尾藻滩涂改变了微生物和螃蟹的新陈代谢,加强了蓝碳储存

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Mathias Chynel, Gwenaël Abril, Mélissa Narayaninsamy, Loris Deirmendjian, Frédéric Guérin, Charlotte Dromard, Tarik Meziane
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引用次数: 0

摘要

底栖生物的新陈代谢和红树林沉积物中净碳的积累在很大程度上取决于所提供的有机物(OM)的数量和质量,包括由沿岸水域带来的物质,如大型藻类马尾藻。利用脂肪酸(FAs)、有机碳及其碳同位素特征的浓度以及沉积物-空气二氧化碳通量来跟踪表层和次表层沉积物中沉积 OM 的演变,持续 60 d。马尾藻滩涂改变了微生物和螃蟹的新陈代谢,导致马尾藻(δ13C = -17.7‰,高浓度的必需脂肪酸)和红树林叶(δ13C:-28.9‰,高浓度的18:2ω6和18:3ω3)中的可溶性部分OM优先降解。螃蟹肝胰脏的脂肪酸组成显示,它们更喜欢摄食马尾藻,这些无脊椎动物也增加了潮汐输出的微粒 OM。此外,沉积物表面的微生物活动也得到了加强,在含有马尾藻的中置池中,支链脂肪酸的大量产生和较高的二氧化碳通量都表明了这一点。然而,马尾藻滩涂也增加了红树林叶片中较难吸收的 OM 的转移和保存,60 d 后在表层下沉积物(6-8 cm)中发现了较多的 OM。螃蟹的活动增强了这种负引导效应。在热带海洋富营养化日益严重的情况下,包括微生物群落在内的这些生物相互作用显然使红树林能够有效地储存碳。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sargassum beaching on mangrove sediments shifts microbial and crab metabolisms and enhances blue carbon storage
Benthic metabolism and net carbon accumulation in mangroves sediments strongly depend on the quantity and quality of organic matter (OM) supplied, including material brought by coastal waters such as the macroalgae Sargassum spp. Mesocosms were used to assess the effect of eutrophication by Sargassum on mangrove sediments. The concentration of fatty acids (FAs), organic carbon and its carbon isotopic signature, and the sediments–air CO2 fluxes were used to follow the evolution of sedimentary OM in surface and subsurface sediments for 60 d. Sargassum beaching shifted microbial and crab metabolism, leading to a preferential degradation of the labile fraction of OM from both Sargassum13C = −17.7‰ and high concentration of essential FAs) and mangrove leaves (δ13C: −28.9‰ and high concentrations of 18:2ω6 and 18:3ω3). Fatty acids composition of crabs hepatopancreas revealed they preferentially fed on Sargassum and these invertebrates also increased the particulate OM tidal export. In addition, microbial activity at the sediment surface was enhanced, as revealed by strong production of branched FAs and higher CO2 fluxes in mesocosms containing Sargassum. However, Sargassum beaching also increased the transfer and preservation of more refractory OM from mangrove leaves found in higher quantity in subsurface sediments (6–8 cm) after 60 d. Inputs of macroalgae induced a negative priming effect and enhanced the preservation of blue carbon in the sediments. This negative priming effect was enhanced by crab activities. These biotic interactions that include microbial communities apparently make mangrove efficient in storing carbon in a context of growing eutrophication of the tropical ocean.
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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