Additional record of scleractinian corals on Porbandarcoast, Gujarat, India
Dishant Parasharya 1 & Geeta Padate 2
1,2 Department of Zoology, Faculty of Science,
The M.S. University of Baroda, Vadodara, Gujarat 390002, India
1 dparasharya@gmail.com
(corresponding author), 2 geetapadate@gmail.com
doi: http://dx.doi.org/10.11609/JoTT.o3317.5900-4 | ZooBank:urn:lsid:zoobank.org:pub:4D503963-668C-4C54-A52C-9C56ACADC9A9
Editor: C. Raghunathan,
Zoological Survey of India, Port Blair, India. Date
of publication: 26 June 2014 (online & print)
Manuscript details: Ms # o3317 | Received 22 August
2012 | Final received 31 May 2014 | Finally accepted 03 June 2014
Citation: Parasharya, D. & G. Padate (2014). Additional record of scleractiniancorals on Porbandar coast, Gujarat, India. Journal of Threatened Taxa6(6): 5900–5904; http://dx.doi.org/10.11609/JoTT.o3317.5900-4
Copyright: © Parasharya& Padate 2014. Creative Commons Attribution
4.0 International License. JoTT allows
unrestricted use of this article in any medium, reproduction and distribution
by providing adequate credit to the authors and the source of publication.
Funding: None.
Competing Interest: The authors declare no
competing interests.
Acknowledgements: The
authors are thankful to Dr. Deepak Apte BNHS for permitting collection of Data on corals
simultaneous while working on the project All India Coordinated Project on
Taxonomy (AICOPTAX) of mollusc - Gujarat at BNHS. The authors are also
thankful to other colleagues of BNHS, Vishal Bhaveand Rajesh Parmar and colleagues and staff members of
Department of Zoology - The M.S. University of Baroda.
For figures, images, tables -- click here
Gujarat State has a 1,750km long coastline, rich in coastal biodiversity
(Sengupta & Deshmukhe2000). Veraval,Jakhau, Mangrol, Porbandar, Okha, Bedi and Dwarka on this coast
have a great potential for procuring large quantities of fish, collected from
the Arabian Sea, especially for export. The southern coast of the Gulf of Kachchh is one of the richest sources of marine wealth of
India, as it provides favourable conditions for breeding and shelter to many
marine species (Deshmukhe et al. 2000). It comprises one of the four major coral
reefs of India. The history of
coral reef research in this area is as old as a century, where Hornell (1909)
described the coral reefs and the chank fishery of Okhamandal, also known as PoshitraBay. Pillai& Patel (1988) gave a detailed account of the hard coral fauna of the Gulf
of Kachchh with reference to only 16 locations of the
gulf area, which they conducted in 1987, a single year study. Unfortunately, there are very few
studies describing the occurrence of corals in the other parts of Gujarat coast,
i.e., Saurashtra coast. These studies include corals of Dwarka, Veraval, Diu and Mahuva by Raghunathan et al.(2004) and occurrence of soft coral species off Veraval coast by Bhagirathan et
al. (2008). No other locations were
explored scientifically to document scleractiniandiversity on the Saurashtra coast. This paper describes the occurrence of scleractinian species at Kuchdireef near Porbandar on the Saurashtracoast facing the Arabian Sea (Image 1).
Study Area: On the western coast of Saurashtra, Kuchdi reef is
situated at 21040’12.6”N & 69032’36.5”E
and is attached to the mainland (Image 2). The area is about 15km north-west from the city
of Porbandar. The mean value of high tide is about 3m, with a range of 1–6 m,
whereas the mean value of low tide is 0.4m above mean sea level (Sengupta & Deshmukhe2000). The closest known occurrence
of scleractinian diversity is from Dwarka (Raghunathan et al. 2004),
which is located 80km north-west of the study
area. Due to the steep slope of the
continental shelf, the edge of the intertidal zone is completely exposed only
during the negative tides of the year. Such tides come twice in summer (between March and June) and twice in
winter (between November and February). The sandy beach of the upper inter-tidal zone is followed by a rocky
substratum in the lower-inter tidal zone.
Materials and Methods: The study was carried
out on 31 March 2010 and 1 April 2010. The low tide level during the study was 0.04m. The area of coral coverage and their
community structure were studied using belt transects (Krebs 1986). Eight transects of 1x20 m were laid
parallel to the low tide line using standard measuring tape. The first transect was laid randomly;
while all the subsequent transects were laid at an equal distance of 100m to
the previous transect and were parallel to the low tide line. All the coral species were identified
using standard identification keys (Veron 2000). Coordinates of the site were taken using
an E-Trex garmininstrument. Each coral colony was
classified in three size class groups 0–5 cm, 5–10 cm and
10–15 cm, depending upon their spherical size. The size of the colony was measured
using vernier callipers. As water temperature is one of the key
factors for coral growth, it was measured using a standard digital environment
thermometer. Various parameters
evaluated, follow the methods described by Michael (1986).
Total number of colonies of x species n(x)
Density (d) = ------------------------------------------------------
Area sampled (a)
RealativeAbundance (RA)
(RA) = [Total number of colonies of x species / Total colonies (N) of
all species] * 100
Frequency of Occurrence (fO)
F0 = {Occurrence of x species in no. of transects /
total transects} * 100
Species diversity index - Shannon-sWeinerformula:
H’ = ∑ Pi logepi
Where Pi is the proportion of the ith species in the collection H’is the diversity of a theoretically infinite
population.
Evenness e = ∑ Pi logepi / log N
Species similarity Index between the current study area, i.e., Kuchdi and the nearest coral location i.e., Dwarka was calculated using the following formula
Js = J/ (a+b-J)
Where Js is the Index of
similarity, J is number of species common at both the sites, ‘a’ is no. of species at one site and ‘b’ is no. ofspecies at another site.
Results and Discussions: The exposed inter-tidal
area from high water line to low water line at lowest low tide was only 110m in
width. All the coral colonies
observed were present between 0–40 m from the low water line. No corals were found near the shoreward
edge. Surface water temperature was
280C, whereas the temperature at the bottom of the tidal pool, where
water column was more than 10cm, was 270C. A total of eight species of hard corals
belonging to five families was recorded of which seven occurred in the sampled
area (Table 1) while one was outside the sampled area. This is the first record of these
species from Porbandar District facing the Arabian
Sea. However, these species have
been reported earlier from more than one location from the Gulf of Kachchh (Pillai & Patel 1988;Satyanarayana & Ramakrishna 2009). The shallow shelf of rocky substratum
entangling vegetative along-with sedentary faunal assemblage can be considered
as one of the possible reasons for the settlement of planulaelarvae of these cnidarians during the tidal fluctuations. All the coral colonies recorded at the
location measured less than 15cm in radial growth and showed a similar pattern
in occurrence, i.e., in the shallow water tidal pools having a water depth of
10cm or more during the lowest low tide. Bleaching or disease was not observed in any of the coral colonies. Degradation due to sedimentation on the
top of the massive colonies was observed within the sampled transects. However, there was no sign of any
mortality. There was no significant
trend in the dominance pattern in these corals with reference to their growth
forms.
A total of 25 colonies were recorded in eight transects, of which nine
were of Goniopora minor, with density
of 5.6colonies/100 m2, whereas Favites sp. and Montipora foliosarecorded the lowest density of 0.62 colonies / 100m2, with an
occurrence of only one colony in eight transects.
Recorded species, their colonies and their distribution in other parts
of Gujarat (Table 1, Image 3 a–h).
Montipora foliosa (Pallas), 1766: Only one colony of the species was
recorded during the study, falling under the size class of 5–10 cm. The species has been reported from Boria and Paga from the Gulf of Kachchh (Pillai & Patel
1988).
Favia favus (Forskal,
1775): A
total of three colonies of the species was recorded, of which two colonies fell
under the size class of 0–5 cm and one colony under the size class of
5–10 cm. Pillai & Patel (1988) recorded this species during
their expeditions to Okha, Dholiogugar,
Dona, Boria, Mangunda, Savajo, Paga, Manmarudi,Langhamarudi, Ajad, Bural, Dhani, Kalubhar,Narara, Goose and Pirotanin the Gulf of Kachchh. Satyanarayana& Ramakrishna (2009) have also confirmed this species in the Gulf of Kachchh. This
indicates that this is one of the well distributedspecies of coral, in this area.
Favites sp.: The genus Favites is common in subtropical reefs and in non-reef habitats also (Veron 2000), but the species level variations are sometimes
difficult to confirm. This species
is more or less similar to Favites complanata but needs confirmation. Only one colony falling under the size
class of 5–10 cm was recorded during the study. Pillai &
Patel (1988) reported Favites complanata and Favites melicerum from the Gulf of Kachchh,
whereas Satyanarayana & Ramakrishna (2009)
reported five species of Favites genus viz.,F. pentagona, F. chinensis,
F. halicora, F. complanata andF. flexuosa from the Gulf of Kachchh.
Goniopora minor (Crossl, 1952): Maximum
numbers of colonies were recorded of this species, i.e., nine from Kuchdi during the current study. Out of these nine colonies, six belonged
to the size class of 5–10 cm. Pillai & Patel (1988) have also recorded
this species from Boria, Pagaand Pirotan during their expedition. Further, Satyanarayana& Ramakrishna (2009) have also documented this species from the Gulf of Kachchh.
Porites lutea (Edwards Haime,
1860): A
total of five colonies of this species was recorded
during the present study, with three colonies falling under the size class of
10–15 cm. Pillai& Patel (1988) recorded this species during their expedition in 1988 to Dholiogugar, Dona, Boria, Paga, Dhani and Pirotan in the Gulf of Kachchhwhile Satyanarayana & Ramakrishna (2009) have
also confirmed its presence in the Gulf of Kachchh. The nearest known occurrence of the
species is at Dwarka (Raghunathanet al. 2004).
Tubastrea aurea (Qouy & Gaimard, 1833): Pillai & Patel (1988)
recorded this species during their expedition to Dona & Boriain the Gulf of Kachchh. It has also been reported from Pirotan, Kalubhar, Mungra reef (Sengupta & Deshmukhe 2000) and Dwarka (Raghunathan et al. 2004). Only two colonies were recorded during
the present study.
Turbinaria peltata (Esper, 1794): Pillai& Patel (1988) recorded this species during their expeditions in 1979, 1983
and 1988 from Okha, Paga, Boria & Pirotan. Satyanarayana& Ramakrishna (2009) have also reported this species from the Gulf of Kachchh. The
closest occurrence of this species is from Beyt Shankhodarisland (Deshmukhe et al. 2000). A total of four colonies was recorded during the current study, with two each in the
size class of 0–5 cm and 5–10 cm.
Pseudosidraestrea tayami (Yabe Sugiyama, 1935): Pillai & Patel (1988) recorded this
species during their expedition in 1988 from Okha, Paga, Manmarodi, Ajad, Bural, Dhani,Kalubhar, Narara, Goose andPirotan in the Gulf of Kachchh. Satyanarayana& Ramakrishna (2009) have also confirmed its presence in the Gulf of Kachchh. The
species was not recorded within the sampled area. However, two colonies were recorded from
the reef.
Density and relative abundance (Figs. 1 & 2): The density of the coral colonies was 15.6 colonies/100m2with a maximum density of Goniopora minor, i.e., 5.6 colonies/100m2 (Fig. 1). The frequency of occurrence was also
calculated to be the highest for Gonioporaminor (Fig. 3). Hence Gonipora minor can be considered the most
common / generalist species of the Kuchdi reef near Porbandar on the coast of Saurashtra.
Size class of coral colonies (Fig. 3): A
total of eight colonies out of the 25 recorded, fall in the size class of
0–5 cm, twelve colonies, i.e., almost 50% of the total was recorded under
the size class of 5–10 cm, five colonies including three of Porites lutea and
two of Goniopora minor have
considerable growth and coverage, falling in the size class of 10–15
cm. Life forms of all the colonies
falling in the size class of 10–15 cm were of the massive type. These colonies are comparatively smaller
in size indicating that they have probably evolved recently, compared to the
coral colonies of the Gulf of Kachchh, where the size
class reaches upto 1m in species such as Porites lutea and Turbinaria peltata (Dishant Parasharya2004–2010 pers. obs.).
Diversity Indices: The Shannon Weiner Index of the data was
calculated as 1.7 whereas the evenness calculated was 0.87 indicating moderate
diversity and even distribution of the scleractinianfauna. Raghunathanet al. (2004) documented three species of corals from Dwarka,
viz., Poriteslutea, Tubastreaaureaand Turbinaria crater. The species similarity index between Dwarka & Kuchdi-Porbandar was
calculated as 0.22, which indicates a very low similarity between the two sites
in terms of scleractinian species occurrence.
Conclusions: Occurrence of scleractiniandiversity at the intertidal area of Kuchdi, which is
an addition to the list of coral occurrences of Saurashtracoast, has been reported for the first time. All the species of corals recorded in
this study have also been reported from the Gulf of Kachchharea very regularly. The size of
the colonies of Kuchdi, which hardly reach radially
15cm in length indicates that the colonies are
comparatively recent. The stock of planulae may have migrated not only from Dwarka, as the species similarity index is 0.22 and the
density and abundance of live corals at Dwarka is
very negligible (Dishant Parasharya2006–2010 pers. obser.), but also from the Gulf
along with the water current. Hence, the coral colonies established at Kuchdican be attributed to sexual reproduction followed by larval dispersal of the
colonies present in the southwestern coral locations
of the Gulf of Kachchh to the Kuchdiarea in Porbandar District.
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