William F. Morris, Ruth A. Hufbauer, Anurag A. Agrawal, James D. Bever, Victoria A. Borowicz, Gregory S. Gilbert, John L. Maron, Charles E. Mitchell, Ingrid M. Parker, Alison G. Power, Mark E. Torchin, and Diego P. Vázquez. 2007. Direct and interactive effects of enemies and mutualists on plant performance: a meta-analysis. Ecology 88:1021–1029.

Supplement 1

Information on studies used in the meta-analysis.
Ecological Archives E088-063-S1.

Copyright

Authors
File list (downloads)
Description

Author(s)

William F. Morris
Department of Biology
Duke University
Box 90338
Durham, NC 27708-0338 USA
E-mail: wfmorris@duke.edu

Ruth A. Hufbauer
Department of Bioagricultural Sciences and Pest Management
Colorado State University
Fort Collins, CO 80523-1177 USA
E-mail: hufbauer@lamar.colostate.edu

File list

MorrisEtAl_supplement.csv

Description

MorrisEtAl_supplement.csv is a comma-delimited text file that shows all of the unique agent pairs (e.g., the "Different Agents" column of Appendix A) and provides additional detailed information on all of the studies used in the meta-analysis.

The following table describes the variables in the file:

Column heading:	Description:
Article	abbreviated reference, corresponds to citation list in Appendix A
Plant Species	the species of plant used in the study
Plant Family	the family of plant used in the study
Crop/Noncrop	whether the plant is a crop plant or not
Habit	whether the plants is a herb and what type (forb, grass, shrub), or is woody
Life History	whether the plant is annual or perennial
Site	where an experiment took place
	FieldAg = agricultural field
	FieldNatural = natural field setting
	PopOutside = plants in pots in the field
	PotInside = greenhouse or lab
Field/Greenhouse	whether the experiment was performed outdoors or inside
Control type	what type of control was used in an experiment
	N indicates that no agents were on the experimental control, and that the experiment entailed adding the agents
	AB indicates that both agents were on the experimental control, and that the experiment entailed removing the agents
	B indicates that agent B was on the experimental control, and that the experiment entailed adding agent A and removing agent B
Agent A Species	the species used in analyses as agent A
Agent A type	the guild of agent A
	HerbNem = nematode, feeding as a sucking herbivore
	HerbChew = a chewing herbivore
	HerbSuck = a sucking herbivore, other than nematodes
	HerbSeed = a seed feeding herbivore
	HerbRoot = a root chewing herbivore
	PathFung = a fungal pathogen
	PathVirus = a virual pathogen
	NectarRobber = a nectar robber
	Pollinator = a pollinator
	MutEM = ectomycorrhizal fungus
	MutAM = arbuscular-mycorrhizal fungus
Agent A Class	larger classifications of agents
	enemies: pathogens, herbivores, nectar robbers
	mutualists are grouped together as there are relatively few of them
Agent B Species	the species used in analyses as agent B
Agent B type	the guild of agent B (see key for Agent A type)
Agent B Class	larger classifications of agents, as with Agent A Class
Response Variable	the measure of plant performance used in the experiment that was included in these analyses
Response Type	whether the measure of plant performance tracked reproductive output (repro) or was a measure of size (size)
Interaction	whether the statistics presented in the original experiment indicated a statistical interaction between the agents
	If significant, the P value is provided, or S is indicated if no P value was given
	NS = nonsignificant
	NA = the test was not performed in the original paper
Nc	samples size of the control as defined in this meta-analysis (no agents present)
Na	sample size of the treatment with agent A only
Nb	sample size of the treatment with agent B only
Nab	sample size of the treatment with both agents

Here are several additional notes relating to data collection.

Plant performance measures included measures of size and measures of sexual reproduction. Only four studies included both types of measure. In those cases, for mainly clonally reproducing plants, we chose the measure of size, and otherwise used the sexual reproduction measure. When multiple measures of the same type (either size or reproduction) were presented in a study, we chose the one that best represented plant performance (e.g., total biomass over belowground biomass). We recovered numerical data from graphics using the program ImageJ:

Abramoff, M. D., P. J. Magelhaes, and S. J. Ram. 2004. Image Processing with ImageJ. Biophotonics International 11:36–42.