174
R. A. Ribeiro Filho et al.
Table 13.5 Models of linear regressions performed and their respective values of R², R, F, and p
Models of linear regressions
Effect
R 2
R
F
p
log secchi = 0.287 – (0.368 * log suspended solids)
–
0.412
0.642
200.607
< 0.001
log secchi = 0.390 – (0.345 * log turbidity)
–
0.372
0.610
169.063
< 0.001
log omnivores = 7.241 – (0.452 * log piscivores)
–
0.624
0.790
21.544
0.000
log benthivores = −8.618 + (2.410 * log piscivores)
+
0.875
0.935
90.620
0.000
log detritivores = 9.516 – (1.154 * log piscivores)
–
0.565
0.752
16.896
< 0.001
log zooplanktivores = −5.077 + (1.899 * log piscivores)
+
0.904
0.951
122.815
0.000
log benthivores = 21.538 – (3.663 * log omnivores)
–
0.662
0.813
25.419
< 0.001
log detritivores = −9.124 + (2.583 * log omnivores)
+
0.928
0.963
166.702
< 0.001
log zooplanktivores = 19.857 – (3.117 * log omnivores)
–
0.797
0.893
51.156
< 0.001
log copepoda = −2.721 + (1.739 * log iliophagous)
+
0.583
0.763
18.169
< 0.001
log cladocera = −2.493 + (1.569 * log iliophagous)
+
0.610
0.781
20.344
< 0.001
log chlorophyll-a = −0.274 + (0.303 * log cladocera)
+
0.301
0.549
6.901
0.018
log chlorophyll-a = −0.0155 + (0.209 * log copepoda)
+
0.186
0.431
3.657
0.074
log chlorophyll-a = 0.563 + (29.689 * log P total)
+
0.162
0.402
3.084
0.098
log chlorophyll-a = 6.145 – (1.029 * log omnivores)
–
0.319
0.565
6.082
0.028
log chlorophyll-a = 1.699 – (0.294 * log insectivores)
–
0.364
0.603
7.436
0.017
log chlorophyll-a = 2.573 – (0.415 * log detritivores)
+
0.372
0.610
7.696
0.016
log cyanobacteria = −2.354 + (0.808 * log iliophagous)
+
0.537
0.733
15.067
0.002
log P.total = 0.0234 – (0.00442 * log insectivores)
–
0.453
0.673
10.770
0.006
log P.total = 0.0169 – (0.00243 * log herbivores)
–
0.443
0.665
10.323
0.007
log cyanobacteria = 17.850 – (2.823 * log omnivores)
–
0.658
0.811
24.980
< 0.001
log cyanobacteria = 4.969 – (0.543 * log insectivores)
–
0.341
0.584
6.725
0.022
log cyanobacteria = 7.750 – (1.060 * log detritivores)
–
0.667
0.817
26.042
< 0.001
log cyanobacteria = 1.167 + (0.586 * log zooplanktivores)
+
0.346
0.588
6.864
0.021
log cyanobacteria = −0.349 + (0.359 * log cyanobacteria)
+
0.520
0.721
17.345
< 0.001
Relative abundance (%)
0
20
40
60
80
100
piscivorous
omnivorous
insectivorous
herbivores
benthivores
detritivorous
iliophagous
zooplanktophagous
2000 -200 -2002 -2003 -2004
2000 -200 -2002 -2003 -2004
Fluvial
T ransition
Lacustrine
2000 -2001 -2002 -2003 -2004
Fig. 13.6 Variation of the relative
abundance of fish trophic guilds
according to zones of the Itaipu
Reservoir for the period from
2000 to 2004
R. A. Ribeiro Filho et al.
Table 13.5 Models of linear regressions performed and their respective values of R², R, F, and p
Models of linear regressions
Effect
R 2
R
F
p
log secchi = 0.287 – (0.368 * log suspended solids)
–
0.412
0.642
200.607
< 0.001
log secchi = 0.390 – (0.345 * log turbidity)
–
0.372
0.610
169.063
< 0.001
log omnivores = 7.241 – (0.452 * log piscivores)
–
0.624
0.790
21.544
0.000
log benthivores = −8.618 + (2.410 * log piscivores)
+
0.875
0.935
90.620
0.000
log detritivores = 9.516 – (1.154 * log piscivores)
–
0.565
0.752
16.896
< 0.001
log zooplanktivores = −5.077 + (1.899 * log piscivores)
+
0.904
0.951
122.815
0.000
log benthivores = 21.538 – (3.663 * log omnivores)
–
0.662
0.813
25.419
< 0.001
log detritivores = −9.124 + (2.583 * log omnivores)
+
0.928
0.963
166.702
< 0.001
log zooplanktivores = 19.857 – (3.117 * log omnivores)
–
0.797
0.893
51.156
< 0.001
log copepoda = −2.721 + (1.739 * log iliophagous)
+
0.583
0.763
18.169
< 0.001
log cladocera = −2.493 + (1.569 * log iliophagous)
+
0.610
0.781
20.344
< 0.001
log chlorophyll-a = −0.274 + (0.303 * log cladocera)
+
0.301
0.549
6.901
0.018
log chlorophyll-a = −0.0155 + (0.209 * log copepoda)
+
0.186
0.431
3.657
0.074
log chlorophyll-a = 0.563 + (29.689 * log P total)
+
0.162
0.402
3.084
0.098
log chlorophyll-a = 6.145 – (1.029 * log omnivores)
–
0.319
0.565
6.082
0.028
log chlorophyll-a = 1.699 – (0.294 * log insectivores)
–
0.364
0.603
7.436
0.017
log chlorophyll-a = 2.573 – (0.415 * log detritivores)
+
0.372
0.610
7.696
0.016
log cyanobacteria = −2.354 + (0.808 * log iliophagous)
+
0.537
0.733
15.067
0.002
log P.total = 0.0234 – (0.00442 * log insectivores)
–
0.453
0.673
10.770
0.006
log P.total = 0.0169 – (0.00243 * log herbivores)
–
0.443
0.665
10.323
0.007
log cyanobacteria = 17.850 – (2.823 * log omnivores)
–
0.658
0.811
24.980
< 0.001
log cyanobacteria = 4.969 – (0.543 * log insectivores)
–
0.341
0.584
6.725
0.022
log cyanobacteria = 7.750 – (1.060 * log detritivores)
–
0.667
0.817
26.042
< 0.001
log cyanobacteria = 1.167 + (0.586 * log zooplanktivores)
+
0.346
0.588
6.864
0.021
log cyanobacteria = −0.349 + (0.359 * log cyanobacteria)
+
0.520
0.721
17.345
< 0.001
Relative abundance (%)
0
20
40
60
80
100
piscivorous
omnivorous
insectivorous
herbivores
benthivores
detritivorous
iliophagous
zooplanktophagous
2000 -200 -2002 -2003 -2004
2000 -200 -2002 -2003 -2004
Fluvial
T ransition
Lacustrine
2000 -2001 -2002 -2003 -2004
Fig. 13.6 Variation of the relative
abundance of fish trophic guilds
according to zones of the Itaipu
Reservoir for the period from
2000 to 2004