Basic HTML Version
International Journal of Marine Science 2013, Vol.3, No.4, 23-32
http://ijms.sophiapublisher.com
25
Figure 3 Monospecies population of
Acropa
on reef flat of the
reef Jiang Bo (depth 1 m)
the bivalves
Tridacna crocea
(up to 2 ind./m
2
), and
T.
squamosa
(up to 0.1 ind./m
2
) were the most abundant
of the associated fauna, including the gastropods
Cymatium
spp. and
Oliva
spp. (up to 3 ind./m
2
)
occurring in the sand.
Corals were associated with bivalves, with domination
of
Arca ventricosa
(10~15 ind./m
2
) and
Beguina
semiorbiculata
(up to 10 ind./m
2
), common
Septifer
bilocularis, Pinctada margaritifera
and
Cardita
variegata
, as well as the gastropods
Tectus niloticus,
Trochus maculates
and
Turbo petholatus
(Table 2).
The projective cover of substrate by corals varied from
10% up to 100% and included more than 100 species in
its composition.
From the 670th to the 673rd meter of the transect, in a
rather limited bottom area at a depth of 9~11 m, large
colonies of
A. formosa
and
A. florida
up to 2.5 m in
diameter with clumps of fungiid in between were
replaced by settlements of
A. formosa
with
infundibular
M. aequituberculata
and lamellar–ramose
Merulina ampliata
reaching 1.5 m in diameter. The
percentage of coral covering of the substrate sharply
decreased with 680th meter of the transect, and the
species composition of corals was reduced by almost
2 times. The coral settlements looked like individual
patches of several colonies. Rather small bioherms
sometimes occurred. By the 700th meter of the
transect at a depth of about 9 m only individual
scleractinian or bunches of 3~5 colonies, whose
projective cover of the bottom was about 3%~7%
occurred.
Table 2 Associated flora and fauna on investigated reefs
Species
Jiang Bo
Re
Bach Long Vi
Macrophytes
Amphiroa fragilissima
+
-
+
Asparagopsis taxiformis
+
+
+
Caulerpa racemosa
+
+
+
Chnoospora implexa
+
+
+
Gracilaria
spp
-
+
+
Halimeda
spp
+
+
+
Padina australis
+
+
+
Sargassum olygocystum
+
+
+
Turbinaria ornata
-
+
+
Invertebrata
Acantaster planci
+
+
+
Arca ventricosa
+
+
+
Atrina.vexillum
+
+
+
Atrina inflata
+
-
+
Beguina semiorbiculata
+
+
+
Bohadschia graeffei
+
+
+
Cardita variegata
-
+
-
Charonia tritonis
+
+
+
Chicoreus ramosus
-
+
+
Chicoreus microphyllus
+
-
+
Conus textile
+
-
+
Conus
spp
-
+
+
Culcita novaeguineae
+
+
+
Cyprea arabica
+
+
+
Cyprea textile
-
+
+
Diadema setosum
+
+
+
Drupa ricinus
-
-
+
Echinothrix diadema
+
+
+
Echinostrephus molaris
-
+
+
Holothuria atra
+
+
+
Hyotissa hyotis
-
-
+
Lambis lambis
+
+
+
Linckia laevigata
+
+
+
Lopha cristagalli
+
+
+
Malleus malleus
+
+
+
Petrosia testudinaria
+
+
+
Pinctada margaritifera
+
+
+
Pteria penguin
+
+
+
Septifer bilocularis
+
-
+
Tectus niloticus
-
-
+
Terebra
spp
+
+
-
Tridacna crocea
+
+
+
Tridacna squamosa
+
+
+
Trochus maculates
+
+
+
Turbo argyrostoma
+
+
+
Turbo petholatus
-
+
+
Tutufa bubo
-
-
+
Vasum turbinellum
-
-
+