PCNM1
PCNM2
PCNM3
PCNM4
PCNM5
PCNM6
6
-6
-3
0
3
Amplitude
-6 -3
0
3
6
-6
-3
0
3
6
Electronic Supplementary Materials
6
1
6
12
18
24
30
34
-6 -3
0
3
PCNM7
1
6
12
18
24
30
34
Months
Supplementary Figure 1 Temporal fluctuations of significant principal coordinates
of neighborhood matrices (PCNM) variables selected by redundancy analyses (RDA)
for the 5 sites of the Xiangxi River network
1
Supplementary Table 1 P values for pairwise comparison of Space-Time (S-T)
interaction of algal relative abundance from September 2004 to June 2007 between
the 5 study sites of the Xiangxi River network (P values >0.05 are underlined)
xx1
xx2
xx2
jc
gf
gl
0.094
0.005
<0.001
<0.001
0.015
0.008
0.012
0.004
<0.001
jc
gf
0.002
2
Supplementary Table 2 Percentage of taxa (%) that displayed significant
correlations with specific temporal dynamics of epilithic algal assemblages from
September 2004 to June 2007 at each study site of the Xiangxi River network
Taxa group
Site
1
2
3
4
Total
xx1
16.0
8.6
xx2
22.2
8.5
5.2
jc
16.0
6.9
5.6
24.3
gf
25.7
20.6
2.2
43.4
gl
23.6
9.3
16.8
23.3
3
4.6
7.5
32.0
45.3
Supplementary Table 3 Taxa that displayed significant correlations with specific
temporal dynamics of epilithic algal communities from September 2004 to June 2007
at more than 3 sites (RDA axes were used to represent specific temporal dynamics; +:
taxon appeared in the taxa group)
Taxa
RDA1 RDA2 RDA3 RDA4
Bacillariophyceae
Achnanthes lanceolata (Brébisson ex Kützing)
+
+
+
Achnanthidium affine (Grunow) Czarnecki
+
+
Achnanthidium deflexum (Reimer) Kingston
+
+
+
+
+
+
Cocconeis placentula Ehrenberg
+
+
Delicata delicatula (Kützing) Krammer
+
Diatoma anceps (Ehrenberg) Kirchner
+
+
Diatoma vulgaris Bory
+
+
Encyonema alpinum (Grunow) Mann
+
+
Encyonema minutum (Hilse) Mann
+
+
Eunotia sp1.
+
+
Grunow
Achnanthidium
minutissimum
(Kützing)
+
Czarnecki
Fragilaria capucina subsp. rumpens (Kützing)
+
Lange-Bertalot
Fragilaria capucina var. vaucheriae (Kützing)
+
Lange-Bertalot
4
+
+
+
Gomphoneis clevei (Fricke) Gil
+
+
+
Gomphonema angustatum (Kützing) Rabenhorst
+
+
+
Gomphonema parvulum (Kützing) Kützing
+
+
Gomphonema pseudotenellum Lange-Bertalot
+
+
Gomphonema tergestinum (Grunow) Fricke
+
+
Grunowia tabellaria (Grunow) Rabenhorst
+
Humidophila
Kociolek,
contenta
(Grunow)
Johansen,
Van
+
+
Lowe,
de
Vijver,
+
+
+
+
+
Lange-Bertalot & Kopalová
Navicula cryptocephala Kützing
+
Navicula notha Wallace
+
Navicula radiosafallax Lange-Bertalot
+
Navicula viridula (Kützing) Ehrenberg
+
+
Nitzschia dissipata (Kützing) Rabenhorst
+
+
Nitzschia palea (Kützing) Smith
+
+
Pinnularia sp1.
+
Rhoicosphenia
abbreviata
(Agardh)
+
Lange-Bertalot
Rossithidium
linearis
(Smith)
Round
&
+
Bukhtiyarova
Stephanodiscus minutulus (Kützing) Cleve &
+
+
Möller
Synedra ulna (Nitzsch) Ehrenberg
+
+
Tabellaria fenestrata (Lyngbye) Kützing
+
+
Cyanobacteria
5
Lyngbya sp.
+
+
+
Oscillatoria sp.
+
+
+
Phormidium sp.
+
+
Scenedesmus sp.
+
+
Stigeoclonium sp.
+
+
Ulothrix sp.
+
+
+
Chlorophyta
6
+
+
Supplementary Table 4 Spearman correlation coefficients between ecological guilds
and physical and chemical variables (only variables with P < 0.05 listed)
Physical and
High profile
Low profile
Motile
guild
guild
guild
Site
chemical variables
xx1
xx2
jc
Water temperature
0.387
Conductivity
-0.453
Water temperature
-0.444
Velocity
0.379
Conductivity
-0.400
TN
gf
0.383
Water temperature
Conductivity
gl
0.647
-0.367
0.350
Water temperature
SiO2-Si
-0.385
-0.429
7
0.400