{"title":"Magnetotactic bacterial activity indicates redox conditions in an upland lake in southwest China since the last glaciation","authors":"Tingwei Zhang , Xiaoqiang Yang , Chenglong Deng","doi":"10.1016/j.quascirev.2025.109298","DOIUrl":null,"url":null,"abstract":"<div><div>Magnetofossils have recently been used to indicate paleo-redox conditions of ocean water. However, the scarcity of research into their favored environments and potential relationships with temperature and precipitation in terrestrial setting such as lakes hampers a deep understanding of magnetotactic bacteria (MTB). Here, we present a 90-kyr long record of magnetofossil abundance from a lake sediment sequence of the Tengchong Qinghai Lake (Yunnan Province, Southwestern China). The results demonstrate that MTB activity in the lake was higher during glacial periods with elevated lake levels and weak hydrodynamic conditions. Compared to marine systems, MTB activity in smaller sedimentary catchments is more susceptible to redox condition changes caused by hydrodynamic variations. We propose that high lake levels resulted in water stratification associated with relatively wetter climates and rich organic inputs, which produced favorable environments for MTB to thrive during glacial stages. Magnetofossil contents reflect lake redox variations, with a complex relationship with temperature or precipitation.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"356 ","pages":"Article 109298"},"PeriodicalIF":3.2000,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Quaternary Science Reviews","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0277379125001180","RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOGRAPHY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Magnetofossils have recently been used to indicate paleo-redox conditions of ocean water. However, the scarcity of research into their favored environments and potential relationships with temperature and precipitation in terrestrial setting such as lakes hampers a deep understanding of magnetotactic bacteria (MTB). Here, we present a 90-kyr long record of magnetofossil abundance from a lake sediment sequence of the Tengchong Qinghai Lake (Yunnan Province, Southwestern China). The results demonstrate that MTB activity in the lake was higher during glacial periods with elevated lake levels and weak hydrodynamic conditions. Compared to marine systems, MTB activity in smaller sedimentary catchments is more susceptible to redox condition changes caused by hydrodynamic variations. We propose that high lake levels resulted in water stratification associated with relatively wetter climates and rich organic inputs, which produced favorable environments for MTB to thrive during glacial stages. Magnetofossil contents reflect lake redox variations, with a complex relationship with temperature or precipitation.
期刊介绍:
Quaternary Science Reviews caters for all aspects of Quaternary science, and includes, for example, geology, geomorphology, geography, archaeology, soil science, palaeobotany, palaeontology, palaeoclimatology and the full range of applicable dating methods. The dividing line between what constitutes the review paper and one which contains new original data is not easy to establish, so QSR also publishes papers with new data especially if these perform a review function. All the Quaternary sciences are changing rapidly and subject to re-evaluation as the pace of discovery quickens; thus the diverse but comprehensive role of Quaternary Science Reviews keeps readers abreast of the wider issues relating to new developments in the field.