Craig W. Osenberg, Orlando Sarnelle, Scott D. Cooper, and Robert D. Holt. 1999. Resolving ecological questions through meta-analysis: goals, metrics, and models. Ecology 80: 1105-1117.


Supplements

Supplement 1: Interaction strength: fish effects on snail biomass density.
Ecological Archives E080-005-S1.

Supplement 2: Mutual interference.
Ecological Archives E080-005-S2.

Authors
File list
Description

Copyright


Author

Craig W. Osenberg
Department of Zoology
University of Florida
Gainesville, FL  32611-8525
osenberg@zoo.ufl.edu

File list

Viewable:

Supplement1
Supplement2

Downloadable:

readme.txt (this file in ascii; contains descriptions of datafiles and details about Supplement 1)
E080005S1.txt (the data file for Supplement 1 in ASCII text)
E080005S2.txt (the data file and description of Supplement 2 in ASCII)

E080005.zip (Download all files at once)

Description

I. Supplement 1

Description of fields in Supplement 1.

Study no. (and citations for sources of data). In all cases, except study #5, original data were provided by authors of the studies.

 
Study code (redundant name for species no.)

Substudy (code that gives unique descriptor to each comparison used to generate an effect, usually based on a desciption of the treatment with the higher density of fish)

Species (species of fish whose effect was estimated)

Diet (denotes whether fish species has specialized or generalized morphology and diet)

Duration (number of days the experimental manipulation was in effect before the data were obtained)

Units (units in which snail biomass density was reported)

TFISHwf (density of all fish in treatment with the highest density of fish (i.e., the treatment "with fish", wf)

TFISHwof (density of all fish in the "control" treatment: i.e., the treatment with the lowest density of fish or the treatment "without fish", wof)

SFISHwf, SFISHwof (the density of specialized fishes in the treatments "with" and "without" fish)

DENwf, DENwof (the biomass density of snails in the two treatments)

SDwf, SDwof (the standard deviation of snail biomass density in the two treatments)

Nwf, Nwof (the number of replicate plots in the two treatments)

a (the estimate of interaction strength, calculated as ln(DENwf/DENwof)/dFISH·duration, where dfish is the difference in the density of the fish whose effect is being isolated)

var(a) (the within-study variance of the estimated interaction strength, calculated as:
(1/((dFISH·duration)^2)·((SDwf^2/Nwf·DENwf^2)+(SDwof^2/Nwof·DENwof^2))

Notes:

II. Supplement 2

Description of fields in Supplement 2:  see Supplement 2 (viewable) or download supplement2.txt. Additional information can be found in Arditi and Akçakaya, (1990), Oecologia 83:358.


ESA Publications | Ecological Archives | Permissions | Citation | Contacts