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International Journal of Marine Science 2014, Vol.4, No.47, 1-11
http://ijms.biopublisher.ca
4
Figures 2 (A) Abundance of macrofauna in different transects
(B) various seasons
(
Data presented as mean (squares), ±1 SE
(boxes) and ±1 SD (whiskers). Upside-up triangles: maximum;
down- triangles: minimum)
rend. The similar patterns were found in all the
univariate indices with maximum during summer
season and minimum during monsoon season except
Pielou’s evenness expressed opposite trend (see Table 2).
In multivariate methods, cluster analysis was
employed to know the similarity between the
sampling transects as well seasons based on
macrobenthic abundance data. The results of cluster
analysis for all the samples are shown in Figure 3.
Totally, five different groups were formed in the
cluster analysis. The first group formed between
postmonsoon-2008 and premonsoon-2007 with the
higher percentage of 79.8% within transects IV
(partially freshwater zone) followed by postmonsoon-
2008 of transect II (artificial mangrove environment-
tidal zone) premonsoon-2007 and of transect III
(oyster bed - tidal zone) were clustered with the level
of 79.3%, summer-2008 of transect II (artificial
mangrove environment-tidal zone) and monsoon-2007
of transect I (marine zone) grouped with percentage of
75.2%, the fourth group formed within the transect I
(marine zone) between premonsoon-2007 and
summer-2008 with the level of 74.8% and last group
was found within the monsoon season between
transects IV and III with level of 73.5%. Among this
fourth group was combined together with all other
groups (55.1%) while the last group shared with all
other groups (45.2%).
Table 2
Diversity indices of macrofauna in the study area during 2007-2008
Seasons
Transects
S
N
H' log
d
J′
1-Lambda′
Premonsoon-2007
Transect I
31
388
2.688
5.695
0.4743
0.892
Transect II
43
760
2.602
7.071
0.3136
0.8703
Transect III
27
390
2.146
4.931
0.3168
0.7561
Transect IV
12
288
1.946
2.354
0.5347
0.786
Monsoon-2007
Transect I
20
406
1.945
3.576
0.3497
0.7683
Transect II
20
374
2.255
3.632
0.4767
0.8566
Transect III
19
214
2.43
4.01
0.5977
0.8815
Transect IV
11
140
2.037
2.278
0.6969
0.8396
Postmonsoon-2008
Transect I
35
432
2.433
6.325
0.3256
0.8251
Transect II
33
522
2.396
5.751
0.3326
0.8434
Transect III
26
220
2.448
5.023
0.4449
0.8586
Transect IV
14
228
1.907
2.745
0.481
0.7552
Summer-2008
Transect I
37
514
2.746
6.488
0.4211
0.8936
Transect II
46
816
2.718
7.486
0.3295
0.8575
Transect III
29
390
2.667
5.31
0.4963
0.8769
Transect IV
15
344
1.946
2.72
0.4666
0.7723
Note: S- number of species, N- number of individuals, H' log- Shannon-Wiener index,
d- Margalef richness, J′- Pielou’s evenness
index,
1-Lambda′
- Simpson index