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International Journal of Marine Science 2013, Vol.3, No.41, 333-343
http://ijms.sophiapublisher.com
340
Table 3 The three most numerous taxa (mean %) in each treatment (N=3), at each sampling time
Time
Control
Control Mesocosm
Impacted Mesocosm
Before mixing (0) Gloeocystis
18%
Merismopedia
24%
Merismopedia
38%
Coelasphaerium
15%
Gloeocapsa
22%
Gloeocystis
19%
Chroococcus
15%
Gloeocystis
14%
Coelasphaerium
15%
30 mins
Merismopedia
32%
Coelasphaerium
39%
Merismopedia
37%
Gloeocystis
26%
Merismopedia
23%
Coelasphaerium
30%
Coelasphaerium
16%
Gloeocystis
17%
Gloeocystis
12%
3 hrs
Coelasphaerium
29%
Merismopedia
30%
Coelastrum
22%
Merismopedia
27%
Gloeocystis
13%
Merismopedia
19%
Gloeocystis
14%
Coelastrum
11%
Coelasphaerium
16%
1 Day
Coelastrum
17%
Merismopedia
40%
Gloeocystis
26%
Merismopedia
16%
Gloeocystis
30%
Merismopedia
25%
Gloeocystis
12%
Aphanocapsa
9%
Coelasphaerium
19%
2 Days
Merismopedia
28%
Coelasphaerium
31%
Coelasphaerium
44%
Coelasphaerium
25%
Merismopedia
23%
Merismopedia
19%
Gloeocystis
16%
Palmellopsis
13%
Gloeocystis
9%
3 Days
Coelasphaerium
31%
Merismopedia
36%
Coelasphaerium
43%
Merismopedia
20%
Coelasphaerium
27%
Gloeocystis
23%
Gloeocystis
17%
Gloeocystis
14%
Aphanocapsa
12%
4 Days
Coelasphaerium
25%
Coelasphaerium
34%
Coelasphaerium
31%
Merismopedia
16%
Merismopedia
33%
Gloeocystis
18%
Tetraspora
5%
Coelastrum
8%
Merismopedia
17%
5 Days
Merismopedia
31%
Gloeocystis
32%
Coelasphaerium
26%
Gloeocystis
28%
Coelasphaerium
24%
Merismopedia
20%
Coelasphaerium
18%
Coelastrum
8%
Gloeocystis
15%
Table 4 ANOSIM pairwise tests and Similarity of Percentage (SIMPER) results for phytoplankton assemblages at each sampling time.
Bolded genera are more numerous in 1
st
treatment of listed pairs
ANOSIM Pairwise Test
SIMPER Results
Pair
Global R
Sig. Level (%) Diss. (%)
Taxa most responsible to dissimilarity
Before (0)
Before (0)
Before (0)
Before (0)
Before (0)
C vs CM
-0.333
100
24.93
Merismopedia 20%, Aphanocapsa 14% and Artosphira 9%
C vs IM
0.185
30
33.34
Merismopedia 12%, Palmellopsis 12%, Arthospira 10%
CM vs IM
0.074
40
34.93
Merismopedia 12%, Palmellopsis 11%, Arthospira 9%
30 minutes
C vs CM
0.333
10
21.05
Coelasphaerium 26%, Aphanocapsa 14%, Merismopedia 14%
C vs IM
0.815
10
28.96
Coelasphaerium 21%, Merismopedia 15%, Gloeocystis 12%
CM vs IM
0.889
10
24.32
Coelasphaerium 18%, Merismopedia 16%, Gloeocystis 11%
3 hours
C vs CM
0.222
30
23.69
Gloeothece 12%, Tetraspora 11%, Palmellopsis 9%
C vs IM
0.926
10
28.31
Coelastrum 10%, Coelasphaerium 9%, Palmellopsis 6%
CM vs IM
0.556
10
30.55
Gloeothece 8%, Coelastrum 6%, Tetraspora 6 %
1 day
1 day
1 day
1 day
1 day
C vs CM
0.407
10
53.43
Merismopedia 28%, Coelasphaerium 25%, Gloeocystis 15%
C vs IM
0.185
30
51.61
Merismopedia 28%, Coelasphaerium 22%, Gloeocystis 14%
CM vs IM
0.074
40
33.67
Merismopedia 22%, Coelasphaerium 20%, Gloeocystis 17%
2 days
C vs CM
0.556
10
22.65
Coelasphaerium 21%, Palmellopsis 20%, Aphanocapsa 12%
C vs IM
0.519
20
24.93
Merismopedia 34%, Coelasphaerium 16%, Aphanocapsa 15%
CM vs IM
0.741
10
29.47
Merismopedia 31%, Aphanocapsa 18%, Coelasphaerium 15%
3 days
3 days
3 days
3 days
3 days
C vs CM
0.333
20
20.3
Coelastrum 10%, Palmellopsis 9%, Merismopedia 8 %
C vs IM
1
10
25.4
Coelastrum 14%, Merismopedia 11%, Tetraspora 9%
CM vs IM
0.556
10
18.5
Tetraspora 12%, Aphanocapsa 10%, Coelastrum 8%
4 days
C vs CM
0.333
20
18.88
Tetraspora 14%, Palmellopsis 11%, Anabaena 7%
C vs IM
1
10
23.29
Palmellopsis 14%, Merismopedia 10%, Coelastrum 10%
CM vs IM
1
10
20.58
Palmellopsis 16%, Merismopedia 9 %, Coelastrum 12%
5 days
C vs CM
0.259
20
19.28
Coelastrum 18%, Palmella 6%, Aphanocapsa 6%
C vs IM
1
10
21.58
Merismopedia 13%, Gloeocystis 11%, Coelasphaerium 7%
CM vs IM
1
10
24.48
Coelastrum 15%, Merismopedia 15%, Coelasphaerium 6%