1
FOR ONLINE PUBLICATION ONLY
APPENDICES
Table A1. Summary of Flooding Regime and Background Information on Lakes Studied in the
Mackenzie Delta
Lake sets,
years
studied,
lakes
Sill
FF
Elev,
Distanc
e
D
Background information
on lake sets
Sampling &
measurement
methods
References for
sampling &
measurement
methods
var var Mackay ‘63
Delta
Marsh and Hey ’88, ‘89
Marsh and Lesack ‘96
Rouse and others ‘97
Lesack and others ‘98
Carson and others ‘99
3-lake sill
’85-6
Sill
Elev1
(m)
Skidoo
1.27
South
1.27
NRC
3.50
Fr
Int
IFr
N,
FT
N
F
Fee and others ‘88
water collect
Anema and others ‘90a,b
water, plant
chemistry
Ramlal and others ’91, ‘94
Hecky and Hesslein ‘95
Squires and Lesack ’01,’02,
‘03a,b
Shearer ‘78
Stainton and others
’73, ‘77
mac sampling
epiphyton
Squires and others ‘02
epipelon
phytoplankton
CO2 fluxes
Ramlal and others
’91,’94 Ramlal
and others ’91,’94
Goldsborough and
Robinson ‘83
Eaton and Moss
‘66
Ramlal and others
‘91
Fee ‘84, Fee and
others ‘88
Shearer and others
Aquatic primary production of an arctic river floodplain
2
‘85
Hesslein and
others ‘90
Ramlal and others
‘94
Chain ‘98
T2
T3
T4
T6
T9
D
(km)
Fr
2
Squires and Lesack ’02,
‘03a,b
Squires and others ‘02
3
4
6
9
water collect
pore-water collect
NH3+
SRP
NO3- (frozen)
Squires and
Lesack ‘02
Hesslein ‘76
Solorzano ‘69
Murphy and Riley
‘62
DIC (0.1 uM filter) Dionex IC
chlorophyll
mac sampling
Stainton and others
‘73
epiphyton
Lorenzen ‘67
Squires and others
‘02
epipelon
phytoplankton
(see 3-lake sill
epiphyton)
Hansson ‘90
Squires and
Lesack ‘02
Note: 1 Marsh & Hey 1988
The 3-lake sill set plus other sill controlled lakes have been classified by flooding frequencies (FF),
summer sill elevations (sill elev), and distance class (D). Study sites in the chain-lake set are classified by
distance (D) from the channel connection point. Methodologies and detailed descriptions of each lake set
are provided in the references. Site locations are in Figure 1. var=varied, Fr=frequent flooding,
Int=intermittent flooding, IFr=infrequent flooding, N=near, FT=flow-through, F=far, mac = macrophyte .
Aquatic primary production of an arctic river floodplain
3
Aquatic primary production of an arctic river floodplain
4
Table A2. Percent Carbon Content  1 Standard Deviation (Sample Size in Parenthesis) and Biomass (g
DM m-2) of Major Submerged Macrophyte Species in the Chain-lake Set (1998) and the 3-lake Sill Set
(1986)
Lake
chain
T2
T3
T4
T3*
T5
T6
T9
3lake
sill
Skido
o
South
NRC
Macrophyte
C content (%)
total biomass
(g DM m-2)
))111g1111111111
0
1g1111
7.6 g-1 g
13.8
45.5
135.7
907.2
Potamogeton
Chara
40.60
18.37
%  2.58 (14)
C
%  4.68C(4)
biomass
content bioma
content
per sp
(g C m ss
(g C m0
0
2 0
20
)
per
)
95.3
3.13
0
0
sp
0
77.9
0
0
95.8
5.42
4.29
0.11
54.2
10.01
44.4
3.72
0
4.29
4.29
45.9
25.54
54
13.48
1
0.37
22.5
37.56
41.64  1.9 (38)
0.32
14.97
151
100
100
100
0.13
6.23
62.88
Ceratophyllum
30.47
%  7.82C(5) total C
bioma conten (g C m2
ss
t
)
0
0 0
per
(g Cm
0
0
3.13
2
sp
)
95.3
0
0
5.53
(
0
0
13.73
95.8
4.29
0
0
39.02
77.9
219.08 257.01
0
0
0
0
0
0
0.13
6.23
62.88
* 4.7 % of the macrophyte biomass at T3 was miscellaneous species; carbon fixation by macrophytes at
T3 has been calculated as if 100% of biomass was Potamogeton
Also shown is percent contribution
biomass,
40.60 and total
40.60 to2.58
(14) net carbon fixation by major macrophyte species,
carbon production by the macrophytenaassemblage. Site locations are in Figure 1. DM = dry2.58
mass.
(14)
Aquatic primary production of an arctic river floodplain
5
Table A3. Summary of Weekly Light Attenuation Coefficients and Photosynthetic Parameters for the 3lake Sill Set in 1986
Phytoplankton
Epiphyton
wee
k
KLW
Macrophytes
Epipelon
Pb
m
b
Days
Z
SA
n
su
b
Ht
k
Pm
LW
Pb
m

Pm
Pb
m

2.2
9
6.18
8
0.5
2
0.02
99
2.7
6.18
0.5
0.02
K
LW
+
+
MA
MA
C
C
Skid
oo
June
12
8.04
June
16
5.82
1.9
9
.007
4
June
23
2.59
2.0
3
.003
6
June
30
2.99
1.5
8
.005
5
July
1-15
1.0
0
2.2
E
0.11
4
2.39
0.2
4
2.2
9
Aquatic primary production of an arctic river floodplain
1.1
6
0.10
2
6
5
July
17
Aug.
5
4.42
3.53
2.0
4
1.3
8
.004
4
.005
8
July
1531
Aug.
1-15
0.7
5
3.11
1.1
9
.004
8
0.7
5
Aug. 0.2
5
1531
0.7
5
1.7
5
Aug
20
6.36
Aug.
28
4.16
Sept.
1
4.09
1.3
2
E
0.13
0
0.6
1
E
1.48
4
0.7
8
3.3
4
4.35
1.1
8
0.02
3
2.0
0 P0
1.7
5
Aug.
18
P0
P
0.07
9
0.8
6
E0.2
20
0.2
6
E
0.54
0
0.7
5
P
1.12
5
0.6
8
1.16
3.3
4
2.5
1
1.30
4.08
3.3
4
4.08
1.82
3.3
4
0
8
2
99
3.3
4
4.66
2
0.7
4
0.01
86
4.4
2
4.66
2
0.7
4
0.01
86
0.6
8
0.00
9
3.3
4
4.26
0
0.6
0
0.02
00
0.4
7
0.01
7
3.5
3
4.26
0
0.6
0
0.02
00
2.4
3
0.28
2
2.4
3
0.28
2
3.3
4
1.77
1
0.7
7
0.01
68
2.0
9
0.18
0
3.6
4
1.77
1
0.7
7
0.01
68
2.4
3
0.28
2
2.4
3
0.28
2
3.3
4
3.43
1
0.4
7
0.01
17
2.0
9
0.18
0
3.1
4
3.43
1
0.4
7
0.01
17
1.5
9
.004
0
Sept. 0.2
5
1-7
0.7
5
1.7
5
E
0.22
0
E
0.54
0
0.2
6
3.3
4
0.7
5
3.3
4
0.6
8
2.4
3
P
1.12
Aquatic primary production of an arctic river floodplain
4.08
4.08
1.82
7
5
Sept.
7
2.18
Sout
h
June
12
7.20
June
16
5.46
1.6
3
.007
7
June
23
3.21
1.8
2
.003
9
June
30
2.68
1.5
8
.004
1
July
8
1.41
July
1-15
0.5
0
1.2
5
July
17
1.51
July
23
1.31
Aug.
5
1.03
1.4
0
0.8
6
.003
6
.003
5
July
1531
Aug.
1-15
0.5
0
1.2
5
0.5
0
1.2
5
E
0.20
8
P
0.02
7
E
0.30
0
P
0.09
7
E
1.19
8
P
2.06
0.3
5
2.0
1
0.1
0
2.0
9
0.7
1
1.7
4
0.5
2
1.2
9
0.6
4
1.4
5
0.7
3
1.1
7
Aquatic primary production of an arctic river floodplain
1.00
0.99
1.00
0.99
1.28
2.06
0.6
8
0.00
2
2.0 4.06
1 4
0.6
2
0.01
9
2.9
8
0.01
0
2.0 4.06
9 4
0.6
2
0.01
9
0.6
8
0.00
2
1.7 4.06
4 4
0.6
2
0.01
9
2.9
8
0.01
0
1.2 4.06
9 4
0.6
2
0.01
9
2.0
6
0.16
9
1.4 4.06
5 4
0.6
2
0.01
9
1.8
8
0.00
5
1.1 4.06
7 4
0.6
2
0.01
9
8
8
Aug.
18
1.68
Aug.
28
3.10
Sept.
1
2.33
Sept.
7
1.5
8
1.1
3
.003
8
Aug.
1531
0.2 E
5 0.89
E
0.7 1.46
5 0
0.2
9
1.5
3
0.7
2
1.5
3
1.5 P
0 0.85
2
0.7
3
2.8
9
Sept. 1.1 E
1.46
1-7 1.3 0
5
P
0.85
2
0.9
20.
75
1.5
7
0.1
5
0.7
7
1.28
1.28
2.06
2.0
6
0.16
9
2.0
6
0.16
9
1.8
8
0.00
5
4.4
3
1.5 4.06
3 4
0.6 0.01
2 9
2.8 4.06
9 4
0.6 0.01
2 9
0.03
1
1.5 4.06
7 4
0.6
2
0.01
9
1.6
4
0.04
8
2.9 4.06
4 4
0.6
2
0.01
9
0.9
4
0.00
28
0.7 4.06
0.6
0.01
.005
5
1.28
2.82
2.9
9
1.54
NR
C
June
12
1.54
1.3
7
.005
1
June
16
1.13
1.3
4
.004
7
June
23
0.99
1.7
2
.004
7
June
30
0.93
3.6
9
.006
8
July
3
0.77
July
0.4 P
0 0.91
1-15
5
0.7
0.3
Aquatic primary production of an arctic river floodplain
0.47
9
9
0
P
17.6
1.2 1
0
P
0.78
8
July
17
0.98
0.8
4
.002
2
July
1531
0.4
0
0.7
0
1.2
0
Aug.
5
0.97
1.2
8
.003
8
Aug.
1-15
0.4
0
0.7
0
1.2
0
Aug.
18
1.05
0.4
9
.001
5
Aug.
1531
0.4
0
0.7
0
1.2
0
50.
60
P
2.19
6
0.3
6
P
42.2
7
0.8
4
P
1.89
0
1.4
4
P
2.19
6
0.3
6
P
42.2
7
0.8
4
P
1.89
0
1.4
4
P
1.83
0
0.3
0
P
35.2
2
0.7
0
P
1.57
0
7
4
4.06
4
0.9
8
0.9
7
1.0
5
1.2
0
Aquatic primary production of an arctic river floodplain
0.74
5
0.96
9
0.96
9
0.8
1
0.6
5
0.6
5
0.00
69
0.00
85
0.00
85
2
9
0.6
2
0.01
9
0.01
9
0.9 4.06
8 4
0.6
2
4.06
4
0.6
2
4.06
4
0.6
2
0.01
9
0.6
2
0.01
9
1.0 4.06
5 4
0.6
2
0.01
9
4.06
4
0.6
2
0.01
9
0.9
7 4.06
4
0.01
9
10
Sept.
7
1.17
0.6
7
.004
1
Sept. 0.4
0
1-7
0.7
0
1.2
0
P
1.83
0
0.3
0
P
35.2
2
0.7
0
P
1.57
0
1.2
0
1.1
7
0.33
8
0.4
7
0.00
29
1.1 4.06
7 4
0.6
2
0.01
9
4.06
4
0.6
2
0.01
9
Note: Data for 3-lake sill set from Fee and others 1988, and Ramlal and others 1991.
Light attenuation coefficients include combined attenuation through lake water and macrophytes (kLW +
-1
MAC, m ) at relatively deep (open-water and/or Potamogeton beds) and shallow locations (in Equisetum
beds). Macrophyte height and surface area, and areal parameters of the carbon assimilation/insolation
relationships used for phytoplankton, epipelon and epiphyton are summarized for Skidoo, South and NRC
lake over the growing season. Site locations are as in Figure 1. Ht = macrophyte height (m), SA =
macrophyte surface area (m2), Pm = light-saturated area photosynthetic rate (mg C m-2 h-1),  = slope of
the light-limited areal photosynthesis rate (Pm / E-1 m-2 s-1), Pbm = Pm / chl a content.
Aquatic primary production of an arctic river floodplain
11
Aquatic primary production of an arctic river floodplain
12
Table A4. Summary of Biweekly Light Attenuation Coefficients and Photosynthetic Parameters for the
chain-lake Set in 1997
Epiphyton
Month
Day
s
kLW,
range
kM
_
Macrophytes
Phytoplankton
Epipelon_____
Ht
SA
Pb
m
b
AC
Pm
Pb
m

_
Pm
Pb
m

T2
June
1530
2.726.19
0
0
0
1.4
0
0.0
18
July
1-15
1.202.58
0
0
0
1.5
0
0.0
20
5.9
1.
4
0.00
38
July
1630
1.132.64
0
0
0
1.5
0
0.0
20
5.9
1.
4
0.00
38
Augus
t
1-15
1.715.00
0
0
0
2.2
0
0.0
2
3.8
0.
5
0.00
37
Augus
t
1631
1.695.07
0
0
0
2.2
0
0.0
2
3.8
0.
5
0.00
37
Septe
mber
1-7
1.101.70
0
0
0
2.2
0
0.0
2
3.8
0.
5
0.00
37
T3
June
1530
1.144.51
0
0
00
July
1-15
0.841.58
0
0
0
10.
4
11
.9
0.00
15
27.
0
5.
5
0.00
27
July
1630
0.831.88
0
0
0
10.
4
11
.9
0.00
15
27.
0
5.
5
0.00
27
Augus
1-15
0.96-
0
1.
0.5
4.3
5.
0.00
12.
2.
0.00
Aquatic primary production of an arctic river floodplain
13
t
2.10
25
90
2
17
1
0
59
Augus
t
1631
1.262.75
0
1.
5
0.6
46
4.3
5.
2
0.00
17
12.
1
2.
0
0.00
59
Septe
mber
1-7
1.191.80
0
1.
5
0.6
46
4.3
5.
2
0.00
17
12.
1
2.
0
0.00
59
T4
June
1530
0.872.33
0
0
0
1.0
0
0.0
03
July
1-15
0.801.86
0
0
0
0.7
0
0.0
05
19.
1
24
.1
0.00
74
45.
0
6.
5
0.00
92
July
1630
0.811.83
0
0.
15
0.1
04
0.7
0
0.0
05
19.
1
24
.1
0.00
74
45.
0
6.
5
0.00
92
Augus
t
1-15
0.822.10
0.2
2
1.
5
1.0
39
2.3
0
0.1
8
3.7
1.
8
0.00
14
14.
4
3.
1
0.00
48
Augus
t
1631
0.962.27
0.2
4
1.
5
1.2
47
2.3
0
0.1
8
3.7
1.
8
0.00
14
11.
3
0.
5
0.00
47
Septe
mber
1-7
1.091.29
0.2
4
1.
5
1.2
47
2.3
0
0.1
8
3.7
1.
8
0.00
14
11.
3
0.
5
0.00
47
T6
June
1530
0.951.73
0
0
0
July
1-15
0.691.19
0.1
4
0.
13
0.6
5
27.
4
6.
4
0.00
80
63.
0
4.
3
0.01
97
July
1630
0.581.93
0.6
7
0.
63
3.2
6
27.
4
6.
4
0.00
80
63.
0
4.
3
0.01
97
Augus
t
1-15
0.700.92
1.3
4
1.
25
6.4
7
11.
2
3.
0
0.00
43
22.
7
Augus
t
1631
0.871.73
1.6
1
1.
50
8.4
1
11.
2
3.
0
0.00
43
11.
7
Aquatic primary production of an arctic river floodplain
1.
1
0.
5
0.00
70
0.00
29
14
Septe
mber
1-7
1.1
1.6
1
1.
50
8.4
1
0
11.
2
3.
0
0.00
43
11.
7
0.
5
0.00
29
0.00
76
43.
1
1.
1
0.00
7
T9
June
1530
0.651.0
0
0
July
1-15
0.630.76
1.8
0
0.
2
4.2
0
0.6
0
0.0
05
0.7
0
0.0
05
12.
6
4.
8
July
1630
0.800.88
7.2
2
0.
8
16.
82
0.7
0
0.0
05
6.0
0.
8
0.00
37
40.
8
0.
6
0.01
7
Augus
t
1-15
0.580.90
9.0
2
1.
0
21.
02
2.5
0
0.0
07
6.0
0.
8
0.00
37
40.
8
0.
6
0.01
7
Augus
t
1631
0.590.93
8.1
2
1.
0
19.
01
2.5
0
0.0
07
11.
0
0.
2
0.00
47
19.
9
0.
4
0.00
8
Septe
mber
1-7
0.700.79
8.1
2
1.
0
19.
01
2.5
0
0.0
07
11.
0
0.
2
0.00
47
19.
9
0.
4
0.00
8
Light attenuation coefficients for the water column (kLW, m-1) and macrophyte canopy (kMAC, m-1) are
provided separately. Macrophyte height and surface area, and areal parameters of the carbon
assimilation/insolation relationships for phytoplankton, epipelon, and epiphyton are summarized for T2,
T3, T4, T6 and T9 over the growing season. Site locations are in Figure 1.
Ht = macrophyte
2
height (m), SA = macrophyte surface area (m ), Pm = light-saturated area photosynthetic rate (mg C m-2
h-1),  = slope of the light-limited areal photosynthesis rate (Pm / E-1 m-2 s-1), Pbm = Pm / chl a content.
Aquatic primary production of an arctic river floodplain
15
Table A5. Light Attenuation (kLW, m-1), Nutrient (M), Phytoplankton Chlorophyll a (Chl a) (g L-1),
and Suspended Solid Content (mg L-1) in the Chain-lake Set (mean  1 standard deviation, June 15 September 7, 1998) and in the 3-lake Sill Set (time-weighted means (upper) and Mean  1 Standard
Deviation (lower), June 12 - August 20 or Sept. 7, 1986)
Lake water
Site (n)
NH4+
kLW
T4 (28)
3-lake
Sill
set
2219
1.9
1.61 
2.80 
8.39.
0.7
1.4
2
2.48 
5.64.
1.1
6
2.11 
2.82.
0.8
0
0.76 
2.14 
1.50.
0.1
0.8
7
1.29 
1.09 
0.3
T9 (30)
3.71 
1.4
0.5
T6 (28)
SS
SRP
__
Pore water_____
NH4+
NO3-
SRP
NO3-
Chain
lakes
(n)
T2 (28) 2.68 
T3 (28)
chl a
__
0.48 
0.68 
0.6
0.7
0.16 
0.36 
0.2
0.3
0.11 
0.36 
0.1
0.3
0.05 
0.33 
0.0
0.3
0.06 
0.29 
0.0
0.3
TDP
TDN
Aquatic primary production of an arctic river floodplain
1.3  1.3 1.5  0.7
131 
nd
60.7
nd
2.8  1.2
101 
nd
26.4
nd
8.2  2.2
74 
nd
21.7
nd
nd
18.3 
205 
5.3
86.1
26.6 
171 
5.3
37.9
nd
nd
16
Skidoo
3.99 
1.8
South
2.20 
1.8
NRC
1.05 
0.2
4.7
4.1 1.9
3522.
4
0.48 
0.13
19.0 
22.1 
0.49 
34.5 
0.06
-
-
-
-
-
-
-
-
-
-
-
4.9
4.8
1818. 0.49 
4.3  3.3
6
0.14
3.2
2.0
3.9  2.5
1.6
-
2.3
8.3
Note: Data for 3-lake sill set is from Anema and others 1990b.
Mean nutrient content (M) of pore water in the chain-lake set near the end of July 1998. Site locations
are in Figure 1. n = sample size, SRP = soluble reactive phosphorus, TDP = total dissolved phosphorus,
TDN = total dissolved nitrogen, nd = not detectable, '-' = not available.
Aquatic primary production of an arctic river floodplain
17
Table A6. Seasonal Means  1 Standard Deviation (n = sample size) of Chlorophyll a (chl a) Content (mg
m-2) in the Benthic Algal Communities of the chain-lake Set in 1997 and in the 3-lake Sill Set in 1986
Epiphyton
mean 0.94  0.13
Epipelon
6.97  3.45
T2
T3
T4
T6
T9
NRC
South
n
5
5
mean
0.86  0.5
5.26  1.48
n
5
5
mean
1.2  0.87
13.07  9.84
n
6
7
mean
4.04  1.01
38.23  17.33
n
8
10
mean 4.77  2.43 54.31  12.54
n
6
9
mean
0.91  0.76
-
n
47
mean
1.73  1.60
3.76  3.14
n
84
7
Aquatic primary production of an arctic river floodplain
18
Skidoo mean
n
2.19  1.72
-
45
Note: Data for 3-lake sill set from Ramlal and others 1991.
Epiphyton chlorophyll a is based on rods in both sets of lakes. Epipelon is based on screens in the chainlake set and tissue-trapping in South Lake. Site locations are as in Figure 1.
Aquatic primary production of an arctic river floodplain
19
Table A7. Mean  1 Standard Deviation (sample size = n) of Chlorophyll a (chl a) Content (mg m-2) of
Epiphyton and Epipelon in the Chain-lake Set in July and August 1997 at Selected Representative Sites
Rod-T
Rod- M
Rod-B
Macrophyt
Screen
Sediment
-
5.58 
e
July
T1
-
-
-
1.75 
0.06
n
T2
n
T4
T9
-
1.42 
-
-
1.59 
0.72
0.24
8
3
3.21 
2.88 
1.50
2
-
2
2.01  0.92
-
-
5.71
8
-
-
1
11.90 
13.26
5.51  1.04 0.70  0.53
0.42
0.80
8
3
8
2
4
1
4.80 
6.28 
3.96  0.
25.21 
21.67 
4.73 
1.26
Aquatic primary production of an arctic river floodplain
20
n
0.83
1.64
1.15
8
3
8
1.82 
2.54  0.60
8.87
7.73
2
5
2
-
-
-
-
-
69.63 
Augus
t
T2
n
2.37 
0.88
1.56
8
2
8
11.74 
4.35  2.62
4.06 
T4
2.51
1.61
n
8
2
8
-
-
3
T9
16.31 
17.57 
16.85  8.2
-
54.53 
78.19 
4.4
4.0
18.70
20.92
8
2
15
6
n
12.95
8
-
Epiphyton measurements are based on Plexiglas rods (top, middle, and bottom) and on direct samples
from macrophytes. Epipelon measurements are based on Teflon screens and on direct sediment samples.
Site locations are in Figure 1. T = top, M = middle, B = bottom.
Aquatic primary production of an arctic river floodplain