Widespread occurrence of filamentous Thioploca bacteria in low-sulfate Great Lakes sediments with implications for sulfur and nitrogen cycling
Widespread occurrence of filamentous Thioploca bacteria in low-sulfate Great Lakes sediments with implications for sulfur and nitrogen cycling
复制标题
低硫酸盐五大湖沉积物中丝状硫孢菌的广泛存在对硫和氮循环的影响
DOI：
10.1016/j.jglr.2023.07.003
复制
发表时间：
2023
影响因子：
2.2
通讯作者：
Ozersky, Ted
中科院分区：
文献类型：
--
作者：
McKay, Elizabeth;Katsev, Sergei;Malkin, Sairah;Ozersky, Ted
硫菌属是大型硫氧化细菌，在水生沉积物中形成厘米级的细丝。海洋Thioplocacan形成密集的席，强烈影响沉积物中的地球化学循环。虽然淡水和半咸水Thioplocacan也达到高丰度，但其生态学知之甚少，其在低硫酸盐环境中的代谢是谜。我们量化的淡水Thioplocabiomass和它的链接到环境特征在33个站点在五大湖在使徒群岛地区（湖上级）和格林湾（密歇根湖）。在八个地点的沉积物柱样中分析了硫菌属的垂直分布和相关的沉积物化学成分。尽管硫的可用性很低，但Thioploca获得的生物量与海洋沉积物中的生物量相当，高达250 g m− 2湿重。丰度最高的顶部5厘米的沉积物和更大的细颗粒比粗颗粒的沉积物。Thioploca是常见的富营养和贫营养的位置，这表明沉积物碳的可用性不是一个限制因素。孔隙水剖面表明，可能的氨氧化在缺氧沉积物层占据Thioploca，这将反对异化硝酸盐还原为铵（DNRA）的硝酸盐还原途径常见于marineThioploca。与已知的代谢能力耦合氧化的硫化物或硫代硫酸盐反硝化作用，淡水Thioplocamay发挥定量的重要作用，在底栖生物的氮和硫的循环，虽然在方式上不同于marineThioplocaspecies。我们的研究结果表明，Thioplocamay可能是广泛的沉积区的五大湖，但低估了当地元素循环的影响。
Thioplocaspp. are large sulfur oxidizing bacteria that form centimeter-scale filaments in aquatic sediments. MarineThioplocacan form dense mats that strongly affect biogeochemical cycling in sediments. While freshwater and brackishThioplocacan also achieve high abundances, their ecology is poorly understood and their metabolisms in low-sulfate environments are enigmatic. We quantified freshwaterThioplocabiomass and its links to environmental characteristics at 33 sites in the Great Lakes in the Apostle Islands region (Lake Superior) and Green Bay (Lake Michigan). Vertical distributions ofThioplocaand the associated sediment chemistries were analyzed in sediment cores from eight sites. Despite low sulfur availability,Thioplocaattained biomasses comparable to those in marine sediments, up to 250 g m−2wet weight. Abundances were highest in the top 5 cm of sediment and were greater in fine-grained than coarse-grained sediments.Thioplocawas common at both eutrophic and oligotrophic locations, suggesting that sediment carbon availability was not a limiting factor. Porewater profiles indicated possible ammonia oxidation in the anoxic sediment layers occupied byThioploca, which would argue against the dissimilatory nitrate reduction to ammonium (DNRA) route of nitrate reduction common in marineThioploca. With known metabolic capabilities for coupling oxidation of sulfide or thiosulfate to denitrification, freshwaterThioplocamay play a quantitatively important role in the benthic cycling of nitrogen and sulfur, though in ways that differ from those of marineThioplocaspecies. Our results indicate thatThioplocamay be widespread in depositional zones of the Great Lakes, with yet underappreciated effects on local elemental cycling.
登录
查看更多内容
DOI：
10.1016/j.dsr.2016.03.001
发表时间：
2016-06
期刊：
--
影响因子：
--
作者：
S. Sommer;Jessica Gier;T. Treude;Ulrike Lomnitz;M. Dengler;J. Cardich;A. Dale
通讯作者：
S. Sommer;Jessica Gier;T. Treude;Ulrike Lomnitz;M. Dengler;J. Cardich;A. Dale
秘鲁近海上升流系统中的底栖生物生物量和缺氧
影响因子：
0.5
作者：
R. Rosenberg;W. Arntz;E. Flores;L. A. Flores;G. Carbajal;I. Finger;J. Tarazona
通讯作者：
J. Tarazona
影响因子：
2.9
作者：
Holmkvist, Lars;Arning, Esther T.;Jorgensen, Bo Barker
通讯作者：
Jorgensen, Bo Barker
影响因子：
3.6
作者：
Kojima, Hisaya;Koizumi, Yoshikazu;Fukui, Manabu
通讯作者：
Fukui, Manabu
吉布斯能量动态产量法 (GEDYM)：预测能量限制条件下的微生物生长产量
影响因子：
5
作者：
C. Smeaton;P. Cappellen
通讯作者：
P. Cappellen