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Food Chain Dynamics In A Simple Ecosystem

By Jessica Joyner, J. Phil Gibson, Anna Petrovicheva

 

Brine Shrimp Image

 

Module Description: 

Demonstrating predator-prey dynamics rarely fit the timeline of a lecture course or the scope of student experiences.  This lab explores food chain dynamics in a microcosm of a simplified ecosystem with a primary producer and a grazer. It can be accomplished in two class sessions (one for experimental setup and the other for data collection).  The primary producer is a marine algae and the grazer is brine shrimp (Artemia sp.), both of which are accessible and have low risk in culturing and maintenance. For the ecological context of predator-prey dynamics, the population densities are compared after a 2-week incubation of student designed experiment. Additionally, the concepts of 'bottom-up' or 'top-down' influences on an ecosystem can be taught and discussed in a broader context of ecosystem ecology.
 
 

Teaching Setting:

The module was designed for used in an introductory Ecology course with a mix of Biology and Sustainability majors, most of which were upperclassmen.  The resource includes the lab exercise, a hypothesis workshop, teaching notes, and Excel sheet templates to estimate population sizes and compare means among groups via t-test or ANOVA.
 
 

Full Citation:

Joyner, J., Gibson, J. P., Petrovicheva, A. (2018). Food Chain Dynamics In A Simple Ecosystem. Plants by the Numbers, QUBES Educational Resources. doi:10.25334/Q4C41H
 
 
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Related Materials and Opportunities:

This module is one of several that was adapted by participants in the Botany Society of America (BSA)-sponsored Faculty Mentoring Network (FMN) “Plants by the Numbers” held during the Spring 2018 semester.  If you are interested in adopting plant-focused modules that address quantitative reasoning skills, apply by August 24, 2018 to join the “Plants by the Numbers II” FMN for Fall 2018.   Dr. Phil Gibson also presented a session at the BioQUEST/QUBES Summer Workshop in which he describes the modules used in the BSA “Plants by the Numbers” FMN at the 2018 BioQUEST/QUBES Summer Workshop.



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