Ecological Archives E084-020-A1

Christopher F. Steiner. 2003. Variable dominance in pond communities: assessing spatiotemporal variation in competition and predation intensity. Ecology 84:982–990.

Appendix A. Environmental data for each study site and experimental period. See Notes for details.

Pond
Max depth (m)
Area (m2)
pH
Dissolved oxygen
(mg/L)
Temp. (oC)
Seston C:P (molar)
Seston N:P (molar)
Total chlorophyll a
(µg/L)
Early season (June)
P12
n.a.
n.a.
6.90
6.01
25.3
416.7
105.8
5.27
P14
n.a.
n.a.
6.92
6.00
25.5
488.7
143.0
8.65
P15
n.a.
n.a.
7.05
11.30
25.8
437.1
53.3
6.47
Shaw4
n.a.
n.a.
4.60
9.00
23.5
238.1
24.3
18.44
Lux16
n.a.
n.a.
6.05
8.91
24.5
121.0
14.2
188.16
Late season (August)
P12
1.6
700
8.09
2.64
26.0
548.7
36.6
4.93
P14
1.6
700
8.22
5.52
26.0
439.6
34.9
7.25
P15
1.6
700
8.18
6.19
26.5
497.2
36.6
3.48
Shaw4
1.4
4208
5.30
0.28
25.0
498.8
36.6
72.38
Lux16
1.5
450
6.60
0.75
22.0
155.6
11.3
49.16

 

 
Algal size structure
relative abundance of chlorophyll a
per size class (%)
Zooplankton biomass (mg/L)
Pond
<15m
15–60
µm
>60
µm
Total zooplankton
Daphnia pulex
Diaphanosoma brachyurum
Early season (June)
P12
91.2
4.6
4.2
1.45E-01
4.51E-03
2.63E-02
P14
52.2
21.7
26.1
1.15E-01
5.10E-03
7.06E-02
P15
30.8
17.4
51.8
4.85E-01
1.57E-04
9.11E-02
Shaw4
15.4
38.5
46.1
8.15E-02
1.84E-02
2.10E-04
Lux16
20.1
61.7
18.2
1.20E-01
7.76E-02
0
Late season (August)
P12
38.7
33.1
28.2
1.24E-01
6.14E-04
6.06E-02
P14
60.2
4.5
35.2
2.20E-02
0
9.62E-03
P15
54.4
24.9
20.7
4.01E-01
0
7.43E-03
Shaw4
23.4
47.1
29.5
3.96E-03
0
1.70E-04
Lux16
19.7
11.7
68.6
1.80E-01
1.65E-01
0

 

Zooplankton biomass (mg/L)
Pond
Ceriodaphnia spp.
Chydorus sphaericus
Scapholeberis spp.
Alona spp.
Pleuroxus spp.
Total small cladocera
Early season (June)
P12
1.15E-02
0
0
0
0
3.78E-02
P14
1.90E-03
7.21E-04
0
1.34E-05
0
7.33E-02
P15
1.34E-03
0
0
0
0
9.24E-02
Shaw4
1.51E-02
2.22E-02
2.35E-04
0
0
3.78E-02
Lux16
0
0
0
0
0
0
Late season (August)
P12
1.19E-02
2.36E-04
0
7.56E-08
1.33E-06
7.27E-02
P14
7.00E-05
4.50E-05
0
9.02E-06
2.06E-06
9.75E-03
P15
3.60E-03
4.56E-03
0
2.81E-06
6.87E-07
1.56E-02
Shaw4
3.36E-03
0
2.35E-04
0
0
3.76E-03
Lux16
2.46E-04
0
0
0
0
2.46E-04

 

 
Zooplankton biomass (mg/L)
   
Pond
Calanoid copepods
Cyclopoid copepods
Total rotifer
Chaoborus americanus
(no./L)
Chaoborus americanus
mean body mass
(mg/individual)
Early season (June)
P12
1.00E-01
2.01E-03
0
0.70
2.91E-02
P14
3.09E-02
2.07E-03
3.45E-03
1.66
1.74E-02
P15
3.38E-01
7.12E-03
4.78E-02
2.15
6.15E-03
Shaw4
2.81E-04
1.86E-02
6.42E-03
0.52
1.65E-03
Lux16
2.14E-02
1.88E-02
1.82E-03
4.11
6.87E-03
Late season (August)
P12
4.78E-02
2.52E-03
0
1.60
1.22E-02
P14
1.02E-02
2.08E-03
0
0.13
9.72E-03
P15
3.40E-01
4.55E-02
0
0.72
6.48E-03
Shaw4
0
1.93E-04
0
0.69
1.14E-02
Lux16
9.81E-04
6.27E-03
6.90E-03
6.33
5.38E-02

 

 
Chaoborus americanus size structure
 
Density (L-1) per instar
Relative abundance per instar (%)
Pond
Instar I
Instar II
Instar III
Instar IV
Instar I
Instar II
Instar III
Instar IV
Early season (June)
P12
6.01E+00
2.39E+00
9.41E-01
3.62E-01
61.9
24.6
9.7
3.7
P14
8.93E+00
2.72E+00
1.81E+00
0.00E+00
66.3
20.2
13.5
0.0
P15
0.00E+00
0.00E+00
0.00E+00
0.00E+00
91.5
7.8
0.0
0.8
Shaw4
0.00E+00
0.00E+00
0.00E+00
0.00E+00
91.7
8.3
0.0
0.0
Lux16
2.77E+00
2.08E-01
9.46E-02
0.00E+00
90.2
6.8
3.1
0.0
Late season (August)
P12
1.59E+00
9.70E-01
6.93E-02
0.00E+00
60.5
36.8
2.6
0.0
P14
0.00E+00
0.00E+00
0.00E+00
0.00E+00
50.0
50.0
0.0
0.0
P15
3.51E+00
8.26E-01
2.07E-01
0.00E+00
77.3
18.2
4.5
0.0
Shaw4
4.50E+00
1.04E+00
3.46E-01
0.00E+00
76.5
17.6
5.9
0.0
Lux16
6.94E+00
1.23E+01
8.01E+00
1.07E+00
24.5
43.4
28.3
3.8

   Notes: Limnological variables measured in the four study ponds during the early season (June 1999) and late season (August 1999) experimental periods. To determine biotic measures (zooplankton, Chaoborus, chlorophyll a, and seston C:N:P measures), water samples were taken at several points along a qualitative transect extending from pond edge to pond center and pooled to integrate spatial variation. Zooplankton and Chaoborus measures are means of two replicate samples. Abiotic variables (pH, temperature, and dissolved oxygen) were measured at mid-depth along the same transects and then averaged. Zooplankton biomass and Chaoborus body mass are dry weight estimates based on length-mass regressions. Seston C:N:P is based on the <35- µm fraction. Depth and area data were measured in July and August of 1998. 



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