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different scenarios. Though it would be ideal to investigate OA effects under natural
conditions with fluctuating or changing abiotic factors, experimental logistics usually limit the combinations of several environmental drivers. Therefore, in investigations of photosynthetic responses to OA, phytoplankton, and/or macroalgae
should be exposed to solar UV radiation. Mechanisms involved in the combined or
compounded effects of OA and UV should be explored to establish a reliable theory
toward understanding regional responses of marine primary producers to the changing ocean environment. Due to research activity logistics, under multiple environmental stressors, our knowledge is limited in our understanding of how the effect of
OA or UV or UV plus OA changes. In some waters where the chemical environment
is fluctuant, some regional problems such as the effect of OA on biological activities
require further studies; the effect of OA on the process of UV photodegradation of
organics will influence the amount of marine carbon fixation or carbon storage
directly or indirectly.
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