In this module, we will explore the links between biodiversity and the ecosystem. In doing this, we will also practice methods of scientific inquiry, moving from theory or observation to a question and hypothesis and the design of an experiment. We will begin with discussions of BEF, including a history of the field and the controversies surrounding it. Then we then analyze a long-term dataset from the Cedar Creek Biodiversity Experiment.

 

In teams, you will formulate a question and hypothesis and analyze the data. Did you find support for your hypothesis? What new question has arisen through your analysis? What kind of data would you need to answer this question? You will then propose an experiment or observational study in order to answer this question. At the end of the module, you will present your journey, and how you progressed from a question, theory or observation to a new question and a proposed experiment or observational study. Details of the module are below.

 

BEF Module Assignment

 

Part 1.

In your group, discuss BEF theories and the controversies that surround them. What theory could you test with data from a long-term biodiversity experiment? How can you incorporate time into this consideration? For example, does a long-term dataset address any of the perceived concerns about BEF?

 

Each group will:

1) State a question and hypothesis

2) Define an analytical approach

3) Analyze data

4) Present your results in a figure or figures

5) Interpret your findings

 

Data and Metadata:

You have access to data from the Cedar Creek Biodiversity Experiment that spans 22 years.  There are two datasets, R code and metadata:

 

Aboveground biomass – BIO_II_biomass

Soil carbon – BIO_II_soil_carbon

Example code for analysis and graphing – Bio II

BIO II METADATA for details – BIO II METADATA

 

Part 2.

Many experiments are inspired by patterns (or the lack of pattern) from previous observations or experiments. Using your findings/results/questions from part 1, design an experiment, observational study (or some kind of hybrid) to address your original question or address a new question that arose during the course of your study. This experiment can be as elaborate and complex as you’d like it to be, as long as it *could* be achieved and allows you to address the question you pose. Consult the literature to see what kinds of experiments already exist and what evidence may already exist to support your hypothesis.

6. Describe the knowledge gap or surprise (i.e. what your analysis did or did not show, or what the literature lacks)

7. State (or restate) your question and hypothesis

8. Design and experiment or study to address this question

Add these components to Part 1 and turn in one paper (~3 pages), and give one presentation (5 min) of your journey of discovery. Due on November 3^rd.