An important trend in our time series was that A1 to A4 ecotypes appeared together in 2015, while in 2016 and 2017, high UCYN-A1 nifH gene abundances displaced high UCYN-A2 nifH gene abundances (see events E1 and E2 in Fig. 3 ).
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Microevolutionary patterns in ecotypes of the symbiotic cyanobacterium UCYN-A revealed from a Northwest Atlantic coastal time series.
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