Additional Illustrations of Spatial/Temporal Co-occurrence
Figure 3-2a. Spatial/Temporal Co-occurrence with Positive Reference Sites, Supports. The impairment (dead fish) occurs in similar ecosystems exposed to the same causal agent (effluent from the same industry) at another site.
Figure 3-2b. Spatial/Temporal Co-occurrence with Positive Reference Sites, Refutes. The impairment (dead fish) does not occur in similar ecosystems exposed to the same causal agent (effluent from the same industry) at another site.
Figure 3-3a. Spatial/Temporal Co-occurrence Through Time at a Site, Supports. The impairment (dead fish) occurs when the causal agent occurs (the effluent is being discharged) but not when it does not occur (no discharge).
Figure 3-3b. Spatial/Temporal Co-occurrence Through Time at a Site, Refutes. The impairment (dead fish) occurs whether the causal agent occurs (the effluent is being discharged) or not (no discharge).