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• W3004512101 abstract "ABSTRACT Microorganisms form the basis of ocean ecosystems yet the effects of perturbations such as decreasing pH on microbial community structure, interactions and functionality remain compared to multicellular organisms. Using an experimental manipulation of Southern Ocean seawater, we subjected bacterioplankton and mycoplankton to artificial pH decreases, which are predicted to occur in the future. We show that acidification led to substantial increases of bacterioplankton diversity, while in contrast it had no effect on mycoplankton diversity. Our analyses revealed a loss of putative keystone taxa and a decrease in predicted community interactions as a response to lower pH levels. Bacterioplankton shifted from generalist to specialist community members, suggesting a specific stress response to unfavourable conditions. In addition, enzyme activities involved in nitrogen acquisition were lower at reduced pH levels, suggesting altered organic matter cycling in a more acidic ocean. Our findings suggest that bacterioplankton and mycoplankton may respond differentially to future ocean acidification, with potentially negative impacts on community structure and biogeochemical cycling in the Southern Ocean. IMPORTANCE Oceans absorb the majority of anthropogenically produced CO 2 , the consequence of which is ocean acidification, a phenomenon already negatively impacting key marine organisms. Marine microbial communities form the basis of ocean food webs by generating nutrients for higher trophic levels, yet the response of these key microbial drivers to acidification remains unclear. This knowledge deficit is particularly true for understudied marine ecosystems such as the Southern Ocean. Using a mesocosm approach, we found that acidification severely impacts microbial community stability, by altering bacterioplankton community structure, reducing network complexity, and augmenting enzyme activities associated with nitrogen acquisition. This study adds to our understanding of the effects of ocean acidification on microbial communities, particularly within an environment expected to be largely effected by future anthropogenically driven climate change." @default.
• W3004512101 created "2020-02-14" @default.
• W3004512101 creator A5029032681 @default.
• W3004512101 creator A5080521235 @default.
• W3004512101 creator A5087269571 @default.
• W3004512101 date "2020-02-05" @default.
• W3004512101 modified "2023-09-30" @default.
• W3004512101 title "Polar opposites; bacterioplankton susceptibility and mycoplankton resistance to ocean acidification" @default.
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• W3004512101 doi "https://doi.org/10.1101/2020.02.03.933325" @default.
• W3004512101 hasPublicationYear "2020" @default.
• W3004512101 type Work @default.
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