Koontz, J., D.G. Huggins, C.C. Freeman, D.S. Baker - Central Plains ...

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Water quality Dissolved oxygen Variance in dissolved oxygen concentrations was similar among types, ecoregions, and across survey years and no significant differences were found when evaluated through one-way ANOVA testing of these factors. Dissolved oxygen significantly correlated with temperature and pH. Robust linear regression analysis indicated that a significant and positive relationship existed between dissolved oxygen and temperature (p < 0.000, R 2 = 0.22). This was not unexpected as dissolved oxygen saturation levels are temperature dependent. Differences in dissolved oxygen concentrations were found to vary within wetlands depending on where the in situ readings were taken. Densely vegetated areas had lower mean dissolved oxygen levels than open water areas in seven wetlands that were sampled in both areas (Table 8). Table 8. Comparison of variation within seven wetlands according to differences in microclimates (open water vs. vegetated habitat) using paired t-test (NCSS 2004). * = p < 0.10, ** = p < 0.05. 38 of 84 Sample means Variables Open Water Vegetated pH** 7.33 6.91 Conductivity (µmS/cm) 0.271 0.268 Turbidity (NTUs)* 69 23 Dissolved Oxygen (mg/L)** 3.96 2.95 Temperature ( o C)* 25.6 24.6 Nitrate (mg/L) 0.01 0.02 Ammonia (µg/L)* 67 103 Total Nitrogen (mg/L) 0.92 1.25 Phosphate (µg/L)** 109 179 Total Phosphorous (µg/L)* 299 640 Chlorophyll a (µg/L) 25 75 Total Organic Carbon (mg/L) 10.4 16.1 TN:TP by weight** 4.7 3.6 Turbidity Mean Secchi depth differed among the wetland types but not among classes (Figure 23a and b). Aquatic beds had significantly (p = 0.028) higher mean Secchi depths (0.82 m) than all other types except the MIX category (0.35 m). Due to the wide range of turbidity values across three orders of magnitude, mean turbidity data were log transformed to meet ANOVA assumptions of normality. Mean turbidity significantly differed among the wetlands types with AB being different than all other types (Figure 23 c). No significant differences were found between palustrine, lacustrine, and riverine classes (Figure 23 d). Mean Secchi depth and mean turbidity had a significant linear regression relationship (R 2 = 0.52). Typically the relationship between Secchi depth and turbidity is stronger, but many Secchi depths were limited by their occurrence on the bottom of the wetland. Because of the bottom limitations to accurate Secchi depth
measurements, turbidity was considered the more appropriate measure of light penetration and water clarity. Mean Secchi Depth (m) Mean Turbidity NTU 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 160 140 120 100 80 60 40 20 0 0.7 a b Lacustrine Palustrine Riverine Wetland Class Lacustrine Palustrine Riverine Wetland Class Mean Secchi Depth (m) Figure 23. Error bar charts of mean Secchi depth by (a) wetland class and (b) type, and mean turbidity by (c) wetland class and (d) type. Error bars are one standard error. 0.6 0.5 0.4 0.3 0.2 0.1 0.0 140 120 100 80 60 40 20 0 39 of 84 AB EM MIX UB Wetland Type c 160 d Mean Turbidity NTU AB EM MIX UB Wetland Type
Page 1 and 2: Assessment of Floodplain Wetlands o
Page 3 and 4: Nitrogen ..........................
Page 5 and 6: Executive Summary This project soug
Page 7 and 8: other wetland parameters and assess
Page 9 and 10: quality of plant community, respect
Page 11 and 12: was inevitable, but care was taken
Page 13 and 14: Evidence that waterfowl and/or amph
Page 15 and 16: Floristic Quality Assessments Flori
Page 17 and 18: FQAI ALL 30 25 20 15 10 5 0 Figure
Page 19 and 20: MEAN CONSERVATISM ALL 6 5 4 3 2 1 0
Page 21 and 22: Mean Conductivity mS/cm 0.6 0.5 0.4
Page 23 and 24: Table 7). The wide range of values
Page 25 and 26: Nitrogen - N mg/L Total Nitrogen mg
Page 27 and 28: N:P ratio 30.0 24.0 18.0 12.0 6.0 0
Page 29 and 30: Chlorophyll a ug/L 200 180 160 140
Page 31 and 32: wetlands, respectively. Macroinvert
Page 33 and 34: from analysis did not show signific
Page 35 and 36: major wetland classes when ANOVA an
Page 37: measurement. There are sites within
Page 41 and 42: TOC mg/L TOC mg/L 16 14 12 10 8 6 4
Page 43 and 44: Nitrate:Ammonia Ratio Phase II Tota
Page 45 and 46: CDF 100 90 80 70 60 50 40 30 20 10
Page 47 and 48: was true for organic nitrogen (R 2
Page 49 and 50: Figure 34. Error bar plots of mean
Page 51 and 52: and deethylatrazine were both prese
Page 53 and 54: suspected that differences in sampl
Page 55 and 56: Figure 38. Cumulative distribution
Page 57 and 58: Table 11. Metrics used in the devel
Page 59 and 60: tested: Percent Clingers (+) (p=0.0
Page 61 and 62: CDF Figure 42. Cumulative distribut
Page 63 and 64: Total Nitrogen mg/L Mean Conductivi
Page 65 and 66: Percent Hydroptilidae = 1.463766 +
Page 67 and 68: Table 14. Descriptive statistics fo
Page 69 and 70: MMI Scores 100 90 80 70 60 50 40 30
Page 71 and 72: ecoregions. Mean pH was also found
Page 73 and 74: MMI Scores UB Wetland Type MMI Scor
Page 75 and 76: Acknowledgements Field crew members
Page 77 and 78: Smith, L.M., N.H. Euliss, D.A. Wilc
Page 79 and 80: a. Land and soils coverage maps. b.
Page 81 and 82: Code Phase Longitude Latitude Site
Page 83 and 84: Appendix C. Laboratory measurements

Koontz, J., D.G. Huggins, C.C. Freeman, D.S. Baker - Central Plains ...

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