Aerobic anoxygenic phototrophic bacteria correlate with picophytoplankton across the Atlantic Ocean but show unique vertical bioenergetics

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Carlota R. Gazulla, Michal Koblížek, Jesús M. Mercado, Josep M. Gasol, Olga Sánchez, Isabel Ferrera
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Abstract

Aerobic anoxygenic phototrophic (AAP) bacteria are a common part of microbial communities in the sunlit ocean. They contain bacteriochlorophyll a (BChl a)‐based photosystems that harvest solar energy for their metabolism. Across different oceanic regions, AAP bacteria seem to be more abundant in eutrophic areas, associated with high chlorophyll concentrations. While most previous studies focused on surface samplings, there is limited information regarding their vertical distribution in euphotic zones of the major ocean basins. Here, we hypothesized that AAP bacteria will follow a similar structure to the chlorophyll depth profile across areas with different degrees of stratification. To test this hypothesis, we enumerated AAP cells and determined bulk water BChl a concentrations along the photic zone of a latitudinal transect in the South and Central Atlantic Ocean. Overall, the distribution of AAP bacteria was highly correlated to that of chlorophyll a and to the abundance of picophytoplankton across both vertical and horizontal gradients. Furthermore, estimated light energy captured across the water column showed that, while AAP bacteria share a common latitudinal pattern of light absorption with picophytoplankton, they display a unique vertical arrangement with highest photoheterotrophic activity in the top 50 m of the surface ocean.
需氧无氧光养细菌与整个大西洋的浮游微藻相关,但显示出独特的垂直生物能
好氧性光营养(AAP)细菌是阳光海洋微生物群落的常见组成部分。它们含有以细菌叶绿素 a (BChl a) 为基础的光系统,可利用太阳能进行新陈代谢。在不同的海洋区域,AAP 细菌似乎在富营养化区域更为丰富,这与叶绿素浓度高有关。以往的研究大多集中于海面取样,但有关其在主要大洋盆地透光层垂直分布的信息却很有限。在此,我们假设 AAP 细菌在分层程度不同的区域会遵循与叶绿素深度剖面相似的结构。为了验证这一假设,我们沿大西洋南部和中部纬度横断面的光照区枚举了 AAP 细胞,并测定了散水 BChl a 浓度。总体而言,AAP 细菌的分布与叶绿素 a 的分布以及垂直和水平梯度上浮游微藻的丰度高度相关。此外,对整个水柱中捕获的光能的估算表明,虽然AAP细菌与皮藻浮游生物有着共同的光吸收纬度模式,但它们显示出独特的垂直排列,在表层海洋顶部50米处的光异养活性最高。
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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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