Inquiry-based lessons allow learning that is hands-on and student-driven, fostering engagement and retention of knowledge in any discipline. Here, we use this learning framework to engage students in exploring the effects of biotic and abiotic factors on animal dispersal as a means of connecting students to multiple ecological concepts. Instructors are provided with a guided lecture on key ecological concepts including the impacts of invasive species, dispersal mechanisms, and species interactions with the environment. Furthermore, the interactive lecture introduces students to the snail study system and explains the experimental process, which involves low-cost, readily available materials (e.g., kiddie pools). Students design experiments that explore how variables including density, substrate, and temperature can affect animal dispersal. They conduct the experiments, engage in a process of peer-review, analyze results, and share their study. We performed this lesson in an undergraduate Ecology course and report here on student responses to the experience. The lesson is designed to be performed with the faucet snail (Bithynia tentaculata), an invasive freshwater species throughout much of the Great Lakes region, but can be easily modified to accommodate other species. The lesson is also highly amenable to modifications for variable class sizes, student grade levels, and lesson duration.
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This content will become publicly available on April 18, 2025
Is everything everywhere? A hands-on activity to engage undergraduates with key concepts in quantitative microbial biogeography
The ubiquity and ease with which microbial cells disperse over space is a key concept in microbiology, especially in microbial ecology. The phenomenon prompted Baas Becking’s famous “everything is everywhere” statement that now acts as the null hypothesis in studies that test the dispersal limitation of microbial taxa. Despite covering the content in lectures, exam performance indicated that the concepts of dispersal and biogeography challenged undergraduate students in an upper-level Microbial Ecology course. Therefore, we iteratively designed a hands-on classroom activity to supplement the lecture content and reinforce fundamental microbial dispersal and biogeography concepts while also building quantitative reasoning and teamwork skills. In a class period soon after the lecture, the students formed three-to-five-person teams to engage in the activity, which included a hands-on dispersal simulation and worksheet to guide discussion. The simulation involved stepwise neutral immigration or emigration and then environmental selection on a random community of microbial taxa represented by craft poms. The students recorded the results at each step as microbial community data. A field guide was provided to identify the taxonomy based on the pom phenotype and a reference to each taxon’s preferred environmental niches. The worksheet guided a reflection of student observations during the simulation. It also sharpened quantitative thinking by prompting the students to summarize and visualize their and other teams’ microbial community data and then to compare the observed community distributions to the idealized expectation given only selection without dispersal. We found that the activity improved student performance on exam questions and general student satisfaction and comfort with the biogeography concepts. Activity instructions and a list of needed materials are included for instructors to reproduce for their classrooms.
- Award ID(s):
- 1749544
- PAR ID:
- 10509962
- Editor(s):
- Wessner, David R
- Publisher / Repository:
- American Society for Microbiology
- Date Published:
- Journal Name:
- Journal of Microbiology & Biology Education
- ISSN:
- 1935-7877
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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