

FOLLOWUS
1.College of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
2.Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, Solomons 20688, MD, USA
3.Cooperative Institute for Great Lakes Research, School for Environment and Sustainability, University of Michigan, Ann Arbor 48109, MI, USA
4.Department of Civil and Environmental Engineering, University of Wisconsin-Milwaukee, Milwaukee 53211, WI, USA
5.Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes of Ministry of Education, Hohai University, Nanjing 210098, China
cshen@usts.edu.cn
Received:03 December 2024,
Accepted:14 March 2025,
Online First:21 April 2025,
Published:01 January 2026
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SHEN Chunqi,TESTA Jeremy M.,SONG Yang.Potential impacts of invasive mussels on long-term carbonate chemistry changes in Lake Michigan[J].Journal of Oceanology and Limnology,2026,44(01):125-136.
SHEN Chunqi,TESTA Jeremy M.,SONG Yang.Potential impacts of invasive mussels on long-term carbonate chemistry changes in Lake Michigan[J].Journal of Oceanology and Limnology,2026,44(01):125-136. DOI: 10.1007/s00343-025-4321-z.
While oceanic and coastal acidification has gained increased attention
long-term pH trends and their drivers in large freshwater systems remain poorly understood. The Laurentian Great Lakes are the world’s largest freshwater system
and in many ways resemble marine ecosystems. However
unlike the open ocean and coastal waters where pH has declined due to rising atmospheric CO
2
no significant pH trends have been observed in the Laurentian Great Lakes
despite significant ecosystem changes driven partly by the invasion of dreissenid mussels. This study examined 41 years of field observations from Lake Michigan to investigate the long-term carbonate chemistry dynamics. Observational results revealed substantial declines in both total alkalinity (TA) and dissolved inorganic carbon (DIC) over the four decades. Mussel shell calcification emerged as the primary mechanism behind these declines
accounting for 97% and 47% of the observed changes in TA and DIC
respectively
lowering water column pH by 0.24 units. Elevated carbon accumulation in soft mussel tissues
coupled with long-term changes in the air-water
p
CO
2
gradient during summer
significantly contributed to long-term DIC variations
explaining 18% and 28% of the lake-wide DIC loss. These two mechanisms also resulted in an overall pH increase of 0.09 and 0.12 units
large
ly offsetting the calcification-driven pH decrease. These findings bridge a gap in acidification research for large freshwater systems and provide valuable insights for comprehensive lake-wide management strategies.
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