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International Journal of Marine Science 2014, Vol.4, No.67, 1-6
http://ijms.biopublisher.ca
4
The abundance indicates that the Phylum Mollusc
from the class pelecypod shows that the value of the
abundance is 285 ind/m
2
or 61%, 95 ind/m
2
of
gastropods or 20%, 90 ind/m
2
of bivalves or 19%
(Table 2 and Figure 2). Organisms found during the
research show that Palecypod is the highest abundance
due to Tallo River estuaries containing high organic
materials. In addition, the other environmental
parameters also support the existence of several
species of macrozoobenthos. This case is in
consonance with White’s opinion (1984) that some of
the Phylum Molluscs like the water containing the
high organic materials due to being stored large food.
Furthermore, the researcher also states that the
organic matters are commonly produced by the
activity of agricultural societies and of settlements.
Table 2 Data of the results of organism observations and environmental parameters
Station
Bivalvia
(ind/m
2
)
Gastropoda
(ind/m
2
)
Pelecypoda
(ind/m
2
)
Temp
(
o
C)
Sal
(
o
/
oo
)
pH
BOT
NTU
Depth
(m)
Stream
(m/det)
ST1
0
0
53
30
20
7.9
36.45
6.56
3.5
0.125
ST2
0
7
0
30
29.5
8.2 32
6.56
1.1
0.142
ST3
0
2
1
30
31
8.2
32
6.56
1.2
0.2
ST4
0
1
1
30
30
7.8
36.59
7.25
1.6
0.5
ST5
0
1
0
29
30
7.8
36.59
7.25
1.75
0.5
ST6
0
0
0
31
27
7.8
36.59
7.25
1.5
0.1
ST7
2
0
0
31
29
7.8
36.59
5.21
2.6
0.086
ST8
0
0
1
30.5
30
7.8
36.59
5.21
3
0.416
ST9
0
0
1
30.5
29.5
7.9
35.13
4.4
3.1
0.086
ST10
0
0
0
31
30
7.9
35.13
4.4
3.2
0.111
ST11
0
0
0
31
27
7.9
52.74
4.4
1.2
0.166
ST12
0
0
0
30
21
7.9
52.74
4.4
1.4
0.217
ST13
1
3
0
29.5
21
7.9
52.74
4.4
1.7
0.2
ST14
0
1
0
30
30
7.9
46.73
4.4
1.6
0.111
ST15
0
2
0
30
30
8.1
48.12
5.88
1.6
0.2
ST16
2
1
0
29.5
30
8
48.12
5.88
1.7
0.2
ST17
0
0
0
30
25
8
48.12
5.88
1.2
0.227
ST18
0
0
0
30
27
8
21.98
5.88
2.1
0.25
ST19
1
0
0
30
30.5
7.7
21.98
5.88
3.1
0.125
ST20
12
1
0
29.5
30
7.7
31.2
2.81
4.1
0.156
Figure 2 The Abundance of molluscs in each different class
When linked to the abundance of macrozoobenthos in
Tallo River estuaries and observation stations, the
research indicates that
Hiatula clirinsis
of the class
pelecypod is the highest abundance. It is found
abundantly at stations 1, 3, 4, 9, and 10.
Perineries
brevis
of the class polcyhaeta is a class that has the
second highest abundance found at stations 1, 3, 4, 5, 6,
7, 8, 11, 15, 16, and 17.
Clypeomorus coralium,
Nassarius pollus
, and
Telebraria sp
of the class
gastropod have the third highest abundance found more
at station 2, 3, 4, 5, 13, 14, 15, 16, and 20.
Anomalodiscus squamosus
and
Donax ventatus
of the
bivalvia have the less abundance, and they are found at
station 7, 13, 16, and 19. The fact indicates that
macrozoobenthos found during the research in Tallo
River estuary has uneven spreading. Similarly,
pelecypod, which has the highest abundance, is only
found at a specific station and dominated at station 1,
while polychaeta and gasropoda are found more
diffusely at some stations. It can be categorized there is
a tendency for the molluscs to dominate a particular
station in Tallo River estuary due to the effects of
environmental degradation as the result of industrial