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Relationship between aqueous and sediment chemistry and biological recovery across a gradient of AMD impairment
- Dr. Natalie Kruse, Saruul Damdinbal
Relationship between aqueous and sediment chemistry and biological - - PowerPoint PPT Presentation
Relationship between aqueous and sediment chemistry and biological - - PowerPoint PPT Presentation
Relationship between aqueous and sediment chemistry and biological recovery across a gradient of AMD impairment Dr. Natalie Kruse, Saruul Damdinbal Ohio University Effect of Metals on Biology?? Past data suggests some aqueous metals are
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Effect of Metals on Biology??
- Past data suggests some aqueous
metals are negatively correlated with macroinvertebrate health
- Little suggestion on the role of sediment
metals
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62 sites across a gradient of impairment All have aqueous and sediment chemistry measurements and
- ver 5 years of
macroinvertebrate assessment
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Zones of Recovery
- Unimpaired
- Recovered
- Transition
- Impaired
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Aqueous Chemistry
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Test of Similarity Between Zones of Recovery
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pH by Impairment Zone
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Conductivity by Impairment Zone
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Conductivity by Watershed
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Acidity and Alkalinity by Impairment Zone
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Metals by Impairment Zone
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Aqueous Chemistry vs. Macroinvertebrates
- Statistically significant relationships
between Fe, Al, Mn, and Acidity with MAIS (Macroinvertebrate Aggregrate Index for Streams) metric
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Iron vs MAIS
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Aluminum vs. MAIS
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Manganese vs. MAIS
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Acidity vs. MAIS
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Sediment Chemistry
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Test of Similarity Between Zones of Recovery
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Metals by Impairment Zone
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Sediment Chemistry vs. Macroinvertebrates
- Statistically significant relationships
between Fe, As, Mn, Cu, and Ca with MAIS (Macroinvertebrate Aggregrate Index for Streams) metric
- Mn, Cu, Ca regressions are nearly flat,
so the relationship isn’t suggestive
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Sediment Iron vs. MAIS
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Sediment Arsenic vs. MAIS
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Significant relationship, but nearly flat, so what does it mean? Sediment Manganese vs. MAIS
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Sediment Copper vs. MAIS
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Sediment Calcium vs. MAIS
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Conclusions
- Some aqueous parameters are
statistically similar between zones of recovery, while no sediment chemistry parameters are similar
- Strongest relationship between aqueous
Fe, Al, Mn, and acidity with MAIS
- Strongest relationship between
sediment Fe and As with MAIS
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Conclusions, cont.
- Continued focus should remain on aqueous
chemistry
- Sediments are the sink for metals – can’t
ignore them
- Sediment Fe and As have consistently been
related with lower MAIS scores
– They can co-precipitate – Could be habitat alteration, food quality, or binding
- f N and P rather than toxicity
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