Basic HTML Version
International Journal of Marine Science 2014, Vol.4, No.66, 1-11
http://ijms.biopublisher.ca
3
absent only at 16.8 m quadrate (Table 1).
Gelidiella
acerosa
(Forsskål) J. Feldmann was found with high
and low trend.
Sargassum cinctum
J. Agardh was
observed with increasing frequencies at 16.8 m (13%),
31.8 m (16%) and 59.8 m (21%). In October profile,
Ulva lactuca
Linnaeus was found with decreasing
frequency from 0 m to 20.4 m (Table 1 and Figure 3C).
Valoniopsis pachynema
(Martens) Børgesen was found
with varying frequencies.
Padina boergesenii
Allender
& Kraft was found at 57.4 m (2%) and 95.6 m (4%)
with increasing frequency.
Lobophora varigata
(Lamouroux) Womersley ex Oliveria
, Amphiroa
anceps
(Lamark) Decaisne and
Corallina berteroi
Montagne ex Kützing were observed only at 38.2 m.
1.3 Temporal Variation
Temporal variations in these taxa, in the three sections
of the shore platform, Dwarka are presented in Table 2.
In northern section, total eleven quadrates were studied
in the three sampling months, while in central section
thirteen quadrates were studied and for southern
section, sixteen. Total thirty six macroalgae taxa were
recorded. Table-2 shows the temporal occurrence of
macroalgae on the shore platform. Maximum number
of taxa (26 taxa) were reported during October and
minimum (14 taxa) during June. Frequency data of taxa
are represented section and quadrate wise in Table 1.
1.4 Stages of Growth of Different Macroalgae Taxa
On the shore platform of Dwarka, occurrence of total
36 taxa of macroalgae were noted during the three
sampling months (April, June and October; Figure 2).
Total 16 taxa of Chlorophyta were identified:
Caulerpa sertulariodes
(S. Gmelin) F. brevipes (J.
Agardh) Svedelius,
Halimeda macroloba
Decaisne,
Halimeda tuna
(Ellis & Solander) Lamouroux and
Udotea indica
A. & E. Gepp. were found in April,
June and October indicative of growing season is
pre-monsoon.
Valonia aegagropila
C. Agardh and
Valoniopsis pachynema
(Martens) Bøegesen were
found in June (juvenile) and October (dying) so, their
growing season is in monsoon.
Caulerpa taxifolia
(Vahl) C. Agardh and
Ulva lactuca
Linnaeus were
seen during April and October (juvenile condition) so,
their growing seasons are in winter.
Caulepra
racemosa
(Forsskål) J. Agardh occurred in April and
June (in dying condition) so, its growing season is
summer. Rest of the 7 taxa were identified but cannot
be commented with respect to their growth stages as
their occurrence was noted for once in one month
only.
Total 11 taxa of Ochrophyta were identified:
Stoechospermum marginatum
(C. Agardh) Kützing
was found in mature condition in October so, its
growing season is in monsoon.
Lobophora variegata
(Lamouroux) Womersley ex Oliveria was seen in
juvenile condition in October indicating a growing
season in winter.
Padina boergesenii
Allender &
Kraft was found in April and October months which
implies a winter growing season.
Padina boryana
Thivy was found during April and June so its
growing season is in summer.
Sargassum cinctum
J.
Agardh,
Iyengaria stellata
(Børgesen) Børgesen and
Padina tetrastromatica
Hauck were found during
April, June and October in similar condition so, in
this case it is difficult to comment on their growing
stages and season. Rest of the 4 taxa were identified
but cannot be commented with respect to their
growth stages because their occurrence was noted for
once in one month only.
Total 9 taxa of Rhodophyta were identified:
Gelidiella
acerosa
(Forsskål) J. Feldmann was found during June
and October indicating a growing season in monsoon.
Corallina berteroi
Montagne ex Kützing was found
during April, June and October (juvenile condition) so,
its growing season is in winter.
Hypnea spinella
(C.
Agardh) Kützing was seen during April and October
months implying a growing period in winter.
Ahnfeltia
plicata
(Hudson) Fries
and Centroceras clavulatum
(C.
Agardh) Montagne were found during April and June
indicating growing season in summer. Rest of the 4
taxa were identified but cannot be commented with
respect to their growth stages because their occurrence
was noted for once in one month only.
2 Discussion
The present study shows presence of three groups of
macroalgae on the shore platform found during three
months’ field sampling. Taxa of Rhodophyta and
Chlorophyta were found in both intertidal and subtidal
zones. Ochrophyta were found in the cliffb
ase
zone.
Rhodophyta dominated the northern section during
October while Chlorophyta dominated the subtidal
zone of central section in all the three months and in all
the three sections.
Halimeda
sp.is found only in the
subtidal zone.