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Discussions play a significant role in facilitating student learning through engagement with course material and promotion of critical thinking. Discussions provide space for social learning where ideas are deliberated, internalized, and knowledge is cocreated through socioemotional interactions. With the increase of internet-based and hybrid courses, there is a need to evaluate the degree to which online discussion modalities facilitate quality discussions and enhance student achievement. We assessed the effectiveness of asynchronous online discussion boards and traditional face-to-face discussions via qualitative (thematic coding and discussion network analysis) and quantitative (Bloom's taxonomy) techniques and evaluated student perceptions via precourse and postcourse surveys. We found differential strengths of the two formats. Online discussions increased response complexity, while in-person discussions fostered improved connections with course material. Themes related to sharing of personal identity, humanity and verbal immediacy were more frequent throughout in-person discussions. Survey responses suggested that a sense of community was an external motivator for preference of in-person discussions, while anxiety was a factor influencing online discussion preference. Our findings suggest that online and in-person discussions are complementary, and work in tandem to facilitate complex student thinking through online environments and social learning within the classroom.

Plants harbor a variety of fungal symbionts both above- and belowground, yet little is known about how these fungi interact within hosts, especially in a world where resource availability is changing due to human activities. Systemic vertically transmitted endophytes such as Epichloë spp. may have particularly strong effects on the diversity and composition of later-colonizing symbionts such as root fungal endophytes, especially in primary successional systems. We made use of a long-term field experiment in Great Lakes sand dunes to test whether Epichloë colonization of the dune-building grass, Ammophila breviligulata, could alter fungal root endophyte species richness or community composition in host plants. We also tested whether nitrogen addition intensified the effects of Epichlöe on the root endophyte community. We found that Epichloë increased richness of root endophytes in Ammophila by 17% overall, but only shifted community composition of root endophytes under nitrogen-enriched conditions. These results indicate that Epichlöe acts as a key species within Ammophila, changing richness and composition of the root mycobiome and integrating above- and belowground mycobiome interactions. Further, effects of Epichloë on root endophyte communities were enhanced by N addition, indicating that this fungal species may become even more important in future environments.