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The rate of failure of French students during their first years at university is substantial, with only 42% graduating in the expected three or 4 years. As a result, French universities have called for a “pedagogical transformation” encouraging innovative teaching practices to improve undergraduate students’ academic success, notably the introduction of blended learning methods. In 2015, teachers from the three marine stations of Sorbonne Université created the online blended learning platform e-marin’lab for their marine science programs. In this paper, we investigated the participating teachers’ cognitions with regard to teaching and learning. Despite the success of the project that relied on their substantial voluntary commitment, the teachers demonstrated an adhesion to more traditional views (i.e., directive teacher-student transmission of knowledge is more efficient for students’ learning). Perhaps more paradoxically, our data reveal that the same teachers saw themselves as teaching in a student-oriented way, and that their students’ lack of engagement in class was due to their poor study skills and intrinsic motivation. Among other factors that will be discussed, we believe that these results are influenced by a context that does not provide many teacher training opportunities and that places little importance on teaching in university professors’ career recognition. Finally, the importance of the e-marin’lab platform in the context of the SARS-CoV-2 pandemic situation from 2020 and the massive use of distance teaching in marine sciences during national lockdown periods is discussed.

When considering microbial biotic interactions, viruses as well as eukaryotic grazers are known to be important components of aquatic microbial food webs. It might be the same for bacterivorous bacteria but these groups have been comparatively less studied. This is typically the case of the Bdellovibrio and like organisms (BALOs), which are obligate bacterial predators of other bacteria. Recently, the abundance and distribution of three families of this functional group were investigated in perialpine lakes, revealing their presence and quantitative importance. Here, a more in-depth analysis is provided for Lake Geneva regarding the diversity of these bacterial predators at different seasons, sites and depths. We reveal a seasonal and spatial (vertical) pattern for BALOs. They were also found to be relatively diverse (especially Bdellovibrionaceae) and assigned to both known and unknown phylogenetic clusters. At last we found that most BALOs were positively correlated to other bacterial groups, mainly Gram-negative, in particular Myxococcales (among which many are predators of other microbes). This study is the first shedding light on this potentially important bacterial killing group in a large and deep lake.