design and interpretation of toxic chemical distribution and stress : detroit river case study

Design and interpretation of toxic chemical distribution and stress : Detroit River case study

G.D. Haffner, Sara Wood and Alice Grgicak-Manion

Great Lakes Institute for Environmental Research,Universitry of Windsor, Ontario, Canada

curriculum in natural environmental science, 2005

Stratified/random sampling design for the Detroit River. This design reflects the overall health of the river system and provides the basis for powerful statistical analysis

curriculum in natural environmental science, 2005

Sampling Sites

Lin

kag

e D

ista

nce

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A cluster diagram illustrating the three primary benthic communities

curriculum in natural environmental science, 2005

Plot of Means for Each Benthos Cluster

Taxa .

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ms/

m2)

+1)

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6

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Depositional (1)

Depositional (2)

High energy (3)

The relative composition of the two depositional and one high energy benthic community

curriculum in natural environmental science, 2005

The spatial distribution of the three benthic communities within the Detroit River. Note that although Community 2 tends to aggregate along the lower, western reach of the river, there is no overall pattern of distribution

curriculum in natural environmental science, 2005

Spatial distribution of sites exceeding either LEL or SEL guidelines. Most sampled sites exceeded the guidelines for at least one metal.

curriculum in natural environmental science, 2005

GIS representation of the spatial distributions of Pb and Cd in the Detroit River indicating that different processes were regulating the fate of these metals

curriculum in natural environmental science, 2005

GIS representation of the spatial distributions of Zn and Hg in the Detroit River indicating that different processes were regulating the fate of these metals

curriculum in natural environmental science, 2005