<p>SSC mean values (× 10<sup>5</sup>) and 95% CIs for total cells of PSB <i>C</i>. <i>okenii</i> (black squares, dashed lines) and GSB <i>Chlorobium</i> spp. (red circles, solid lines) populations. Analysis was done over two consecutive days (4 and 5 August 2015) at the depth with maximal cellular density (PSB and GSB combined). (Day1: 1PM, 12.8 m; 5PM, 12.2 m; 9 PM, 12.1 m; 1AM, 12.1 m; 5AM, 13.1 m; 9AM, 12.8 m. Day 2: 1PM, 12.1 m; 5PM, 12.5 m; 9PM, 12.6 m; 1AM, 12.9 m; 5 AM, 12.9 m; 9 AM, 12.7 m). Lines represent tentative interpolations between sampling occasions.</p
