Track A - Water Resources Center - University of Minnesota

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Temporal Scale • What is best for regressions of groundwater-fed streams? • Pilgrim et al. (1998): 36 surface water streams and 3 groundwater-fed streams across MN • monthly produces highest R 2 (Apr. – Oct.) • Time lags up to 7 days for rivers up to 15 ft deep (Stefan and Pred’homme, 1993) • R 2 for a sub-set of our streams • 0.56 at monthly scale, April – October data • 0.86 at weekly scale, year-round data • Number of data points • 431 monthly averages, Apr. – Oct. • 1734 weekly averages, year-round
Results Summary & Comparison • Slopes, intercepts and R 2 varied much between streams • Slopes and intercepts were markedly different from values displayed by surface water fed streams Study Streams Slopes 0.18 - 0.74 Intercepts 2.90 - 8.29 Pilgrim et al.’s Study Streams Slopes 0.85 - 1.15 Intercepts -1.51 - 4.01
Page 1 and 2: Lori A. Krider Joseph A. Magner Jim
Page 3 and 4: Importance • Air temperatures are
Page 5 and 6: Temperature ( o C) Time Frame •
Page 7 and 8: Data Source • Water temperature d
Page 9: Terminology • Regressions explain
Page 13 and 14: Average Weekly Water Temperature (C
Page 15 and 16: Contributing Factors • Factors th
Page 17 and 18: Other Findings • Could not provid
Page 19 and 20: Implications for Climate Change •
Page 21 and 22: Management for Mitigation •Increa
Page 23 and 24: Natural short-term declines in curl
Page 25 and 26: Sustaining Lakes in a Changing Envi
Page 27 and 28: Genesis: Serendipity • Noticed de
Page 29 and 30: Decline in surface growth in Pearl
Page 31 and 32: Curly-leaf pondweed life history
Page 33 and 34: Curly-leaf pondweed life history
Page 35 and 36: Back to the question - Curlyleaf de
Page 37 and 38: Growing Season Differences?
Page 39 and 40: Nah that’s not it - 2010 was actu
Page 41 and 42: Nah that’s not it - spring water
Page 43 and 44: Links to ice cover duration? In oth
Page 45 and 46: Days of Ice 180 160 140 120 100 80
Page 47 and 48: EUREKA!!
Page 49 and 50: Findings • Winters during most of
Page 51 and 52: Dec. + Jan. Snowfall (in) Departure
Page 53 and 54: Implications of Climate Change •
Page 55 and 56: Critical Temp Thresholds High turio
Page 57 and 58: Summary • Winter possibly plays s
Page 59 and 60: Acknowledgments • DNR Area Fisher
Page 61 and 62:
Acknowledgements Will French Jennif
Page 63 and 64:
Introduction Trout streams in SE M
Page 65 and 66:
A Conceptual Model Climate ? Geomor
Page 67 and 68:
Sampling Sites 12 stream reaches i
Page 69 and 70:
Sample Analyses Simpson’s Index
Page 71 and 72:
Number of Genera Present Community
Page 73 and 74:
Diversity (Simpson's Index) Communi
Page 75 and 76:
Community Characteristics North Bra
Page 77 and 78:
Question 2 1. What is the relations
Page 79 and 80:
Question 3 1. What is the relations
Page 81 and 82:
Delta Wr Diversity (Simoson's Index
Page 83:
Conclusion Climate ? Geomorphology
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Track A - Water Resources Center - University of Minnesota

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