USGS - science for a changing world

U.S. Geological Survey - Great Lakes Science Center

Data & Tools

The Great Lakes Science Center shares a variety of web-based tools, data sources, and other supplementary resources for the public.


Flowchart - artiFISHal

Program artiFISHal is a pelagic fish community simulator developed using the R programming language (R Core Team 2013). It is freely available for download from this web page. Program artiFISHal can be used to create artificial lakes and populate them with known numbers of fish (identified in species-size groups) to mimic pelagic fish communities. Program artiFISHal can then be used to sample these fish with virtual acoustic and midwater trawl surveys. Program artiFISHal was used by Yule et al. (2013) to evaluate several different approaches for estimating the biomass of pelagic fish species in the Great Lakes. Send questions and comments on this program to Jean Adams, USGS Great Lakes Science Center Statistician,

BOOTCLUS dendrogram

A program designed to read a standard species abundance data file and produce an agglomerative, hierarchical cluster analysis and bootstrap each linkage to test for significance. BOOTCLUS version 3.1 now includes much better file access capabilities. The same ASCII text input and output files are used, but the Windows general dialogue box for locating files is now available. Please treat this relase as a beta version and always double check the cluster designations provided in the final list against the dendrogram and the significance test. Send questions and comments on this program to Dr. Jim McKenna, Tunision Laboratory of Aquatic Science,

FITPOP screens

A simulation model of population dynamics and genetics. This program is a simple Lotka-Volterra type population dynamics model designed to allow for effects of competition, mortality, and differential fitness between two interbreeding populations of a species (with possible hybridization) or up to 3 different species. Stocking supplementation may be examined. It is very simplistic, but provides a basic demonstration of potential effects of mixing genetically distinct groups on average fitness and population size and growth. This program was designed for the Microsoft Windows operating system (XP or later). Send questions and comments on this program to Dr. Jim McKenna, Tunison Laboratory of Aquatic Science,

Great Lakes Copepods

A web-based key to the free-living and parasitic copepods (including branchurians) of the Laurentian Great Lakes. Send comments or questions on the copepod key to Pat Hudson,


PredTox is a program for performing molecular environmental property estimations, primarily aquatic physical properties and toxicity endpoints, using a Linear Solvation Energy Relationship (LSER) model . Input compounds are written in SMILES , a linear notation for representing molecular structures; output consists of five computed LSER model variable values (Vi, Pi*, Beta, Alpha, and Delta, called vector values) for each compound which are used to evaluate a set of multiple linear regression equations to compute the compound's estimated aquatic properties, including numerous physical properties and toxicity endpoints. Send questions and comments on this program to Dr. James P. Hickey,

Shiny Apps

Interactive data visualization using JavaScript libraries and Google Charts built in R.

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