Sediment microbial taxonomic and functional diversity in a natural salinity gradient challenge Remane's "species minimum" concept.

Although a decreasing trend of microbial diversity along gradients of increasing salinity has been observed ( Rodriguez-Valera et al., 1985 ; Benlloch et al., 2002 ), the results of our study showed that this was only evident for the total number of OTUs; the other diversity indices did not show a statistically significant negative relationship with salinity (data not shown).

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Conclusions From the results of the present study, it can be concluded that the sediment microbial OTUs of the Amvrakikos Gulf salinity gradient do not follow the Remane’s concept, i.e., there is no decrease in the intermediate salinities, but rather a negative trend.

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