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<br />OJJ737
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<br />448 CM, Tate and 1,5, Heiny
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<br />Fig. 2 Oetrended correspondence
<br />analyses (DCA) ordination plot of site
<br />scores on the first two DCA axes and
<br />identification of site groups. Site
<br />abbreviations are listed in Table 1.
<br />
<br />Table 4 Physical and chemical characteristics (mean::!:: standard deviation) by site groupings as defined by detrended
<br />correspondence analyses (OCA) in the South Platte River Basin. .. = Environmental variable having a significant regression with
<br />DCA axis 1 or 2 (see Table 3)
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<br /> Plains
<br /> Braided Downstream from
<br />Attribute/constituent Mountains channel Tributary point source
<br />Physical characteristics
<br />""Drainage area (km2) 1681 '" 2227 46431 '" 30433 1568'" 714 6068 '" 5633
<br />"Slope (m km-1) 14,0 '" 15,6 2.5:t: 2.4 3.7::t 2.2 1.8:t 1.0
<br />""Altitude (rn) 2001 '" 592 1136 '" 373 1531'" 89 1470:t 61
<br />*Sinuosity 1.40'" 0.35 1.10:t: 0.05 1.10'" 0,08 1.10'" 0,05
<br />""Stream order 5:t: 1 6:t: 1 5:t 1 6:t0
<br />'Width(m) 10.0:t: 5.2 33.6 :t: 21.2 7.6:t: 2.8 15.2:t: 2.7
<br />Average channel depth (rn) .28::!: 0.15 0.12:t: 0.11 O.25:t: 0.16 0.38 '" 0,24
<br />Bank height (m) 5.7:t: 7.4 1.3::!::: 0.6 2.4:t: 2.1 8.7:t: 12.2
<br />Dominant substrate size (phi) -5.6:t: 2.7 O::!::: 1.3 -2.5:t 4.3 -6.0::!::: 1.7
<br />Subdominant substrate size (phi) -4.3 :t: 4.4 -2.5:t: 1.8 -6.9:t: 8.3 -1.8:t: 2.0
<br />Mean phi -4.1::!: 2.2 -4.0 :t: 2.4 -4.0::!: 3.1 -2.1:t 1.3
<br />""Mean substrate size (nun) 199 :t: 565 25::!:::77 36 ::!::: 237 63 j: 14
<br />Discharge (m3 s -1) 3.50 '" 3,99 2.89 '" 3,12 2,68 '" 3,26 1.79'" 1.91 "
<br />Average channel velocity (ms-1) 0.49::!: 0.19 0.52'" 0,13 0.53'" 0,16 0.29 :t: 0.17
<br />"'Water temperature (DC) 16::t 3 25::!::: 5 21:t: 3 22 j: 2
<br />Surface-water chemistry
<br />pH 7.56 '" 0,73 8.35'" 0,13 7,98 '" 0.33 7,93 '" 0.85
<br />Dissolved oxygen (mg I-I) 10.4::t 1.9 10.0:t: 1.2 7.7 j: 1.1 11.3 '" 6.3
<br />"'Specific conductance 15:t: 87 1268 '" 746 1135 '" 483 1137 ::!: 272
<br />Hyporheic-water chemistry
<br />Nitrite (mg 1'1) 0,012 '" 0,005 0.010 :t: 0 0,012 '" 0,004 0,160'" 0,260
<br />Organic N + ammonia (mg I-I) 0,76 '" 0,98 0.52 ::!: 0.72 0.64 j: 0.53 1.83 ::!: 2.32
<br />Ammonia (mg I-I) 0,45 '" 0,64 0,27 '" 0.49 0.32 '" 0,47 1.O9::!: 1.66
<br />Total phosphorus (rng 1-1) 0.13 '" 0.22 0.18:t: 0.27 0.26 '" 0.38 0.83:t: 1.19
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<br />@ 1995 Blackwell Science Ltd, Freshwater Biology, 33, 439-454
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