Details

Autor(en) / Beteiligte

• Xing, Weijia
• Hu, Huixin
• Zhang, Yu
• Zhao, Dan
• Wang, Weidong
• Pan, Hong
• Zhang, Shuang
• Yan, Lei

Titel

Magnetotactic bacteria diversity of and magnetism contribution to sediment in Wudalianchi volcanic barrier lakes, NE China

Ist Teil von

• The Science of the total environment, 2020-05, Vol.718, p.137348-137348, Article 137348

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Magnetotactic bacteria (MTB), the members of sediment microorganisms, play an important role in geochemical iron-cycling and sediment magnetism. This study aimed to investigate the diversity and magnetism contribution of MTB in three volcanic barrier lakes with different waterbody types (open waterbody, YC; semi-enclosed waterbody, WB; and enclosed waterbody, YYP). High-throughput sequencing results showed that MTB affiliated to Alphaproteobacteria, Betaproteobacteria and Nitrospira distributed widely in these lakes. The genera of Magnetococcus (98.10%) and Candidatus Magnetoovum (1.47%) were endemic to YC and WB, respectively. The changes in frequency-dependent susceptibility (χfd) values before and after magnetic collection in YC, WB and YYP samples were − 0.28%, 0.05% and − 0.22%, respectively. The magnetic susceptibility was significantly associated with Chao1 (R2 = 0.637 to 0.763, p < .01) and Shannon index (R2 = 0.803 to 0.998, p < .01). The room- and low-temperature magnetic characteristics of sediment samples were analyzed by vibrating sample magnetometer (VSM) and radio-frequency superconducting quantum interference device (SQUID). Results indicated that the presence or absence of MTB could lead to the changes in the room- and low-temperature magnetism of volcanic lake sediments, which would extend our knowledge of MTB magnetism contribution to volcanic ecosystems. [Display omitted] •The diversity of MTB decreased from open to closed to semi-closed water body.•Sediment magnetism with and without MTB were recorded by susceptibility meter, VSM and SQUID.•Significant relationships exist between χfd value and diversity index (p < .01).•MTB obviously affected room- and low-temperature magnetism of sediments.