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| - *** Participants: Steve Cox, David Chalcraft, Shawn Bowers, Bertram Ludaescher, Mark Schildhauer, Chad Berkley, |
| - Dan Higgins, Jianting Zhang ([jzhang@lternet.edu|mailto:jzhang@lternet.edu]) |
| + *** Participants: Steve Cox, David Chalcraft, Shawn Bowers, Bertram Ludaescher, Mark Schildhauer, Chad Berkley, Dan Higgins, Jianting Zhang ([jzhang@lternet.edu|mailto:jzhang@lternet.edu]) |
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| + ** Traits of Interactions |
| + *** Competitive ability |
| + **** Measure how an individual suppresses the growth of a neighbor |
| + *** Interaction strength |
| + *** Effect on environment (ability to reduce resources) (Tilman) |
| + ** Experimental Methods |
| + *** Experiment |
| + **** Field Experiment |
| + ***** Observational/Empirical Experiment |
| + ***** Manipulation |
| + *** All field experiments have |
| + **** Where (site, plots etc) |
| + **** When (sampling regime) |
| + **** What (properties of organism/population/community/system) |
| + *** (An empirical experiment is a field experiment with no manipulation) |
| + *** Manipulations have one or more Treatments |
| + *** Treatment has |
| + **** What was treated? |
| + **** Strength (amount), can be positive (addition) or negative (exclusion) |
| + **** Temporal extent |
| + *** When defining a treatment, a scientist might describe a substance (nutrient, presence of an organism) as being manipulated, or describe the manipulation of a process. |
| + *** Sampling Regime |
| + **** Random |
| + **** Stratified |
| + **** Stratified random |
| + **** Nested |
| + **** Regular (uniform) |
| + **** Haphazard |
| + **** Random haphazard |
| + *** Note that the choice of a sampling regime (and of plot layout?) constrains the possible statistical analysis techniques that can be applied. |
| + *** Traits of Experiments |
| + **** Balanced or unbalanced sampling |
| + **** Replication |
| + *** Traits of Treatment Regime |
| + **** Factorial (all possible combinations of treatments) or not |
| + **** Random factors (treatments along a natural gradient) |
