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Advisor(s)
Abstract(s)
Planktonic heterotrophic prokaryotes (HProks) are a pivotal functional group in marine
ecosystems and are highly sensitive to environmental variability and climate change. This study
aimed to investigate the short-term effects of increasing carbon dioxide (CO2), ultraviolet radiation
(UVR), and temperature on natural assemblages of HProks in the Ria Formosa coastal lagoon during
winter. Two multi-stressor microcosm experiments were used to evaluate the isolated and combined
effects of these environmental changes on HProk abundance, production, growth, and mortality
rates. The isolated and combined effects of increased CO2 on HProks were not significant. However,
HProk production, cellular activity, instantaneous growth rate, and mortality rate were negatively
influenced by elevated UVR and positively influenced by warming. Stronger effects were detected
on HProk mortality in relation to specific growth rate, leading to higher HProk net growth rates and
abundance under elevated UVR and lower values under warming conditions.
Description
Keywords
Acidification Ultraviolet radiation Warming Heterotrophic prokaryotes Growth Mortality
Citation
Microorganisms 11 (10): 2559 (2023)
Publisher
MDPI