The molluscan fauna (gastropods and bivalves) and notes on environmental conditions of two adjoining protected bays in Puerto Princesa City, Palawan, Philippines

Abstract

With the rising pressure of urbanization to biodiversity, this study aimed to obtain baseline information on species richness of gastropods and bivalves in two protected bays (Turtle and Binunsalian) in Puerto Princesa City, Philippines before the establishment of the proposed mega resort facilities. A total of 108 species were recorded, (19 bivalves and 89 gastropods). The list includes two rare miters, seven recently described species and first record of Timoclea imbricata (Veneridae) in Palawan. Threatened species were not encountered during the survey suggesting that both bays had been overfished. Turtle Bay had very low visibility, low coral cover, substantial signs of ecosystem disturbances and shift from coral to algal communities. Although Binunsalian Bay had clearer waters and relatively high coral cover, associated fish and macrobenthic invertebrates were of low or no commercial values. Upon the establishment and operations of the resort facilities, follow-up species inventories and habitat assessment are suggested to evaluate the importance of private resorts in biodiversity restoration.

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India Journal of Entomology and Zoology Studies 2014; 2 (5): 72-90
ISSN 2320-7078
JEZS 2014; 2 (5): 72-90
© 2014 JEZS
Received: 24-08-2014
Accepted: 19-09-2014
Rafael M. Picardal
College of Fisheries and Aquatic
Sciences, Western Philippines
University
Roger G. Dolorosa
College of Fisheries and Aquatic
Sciences, Western Philippines
University
Correspondence:
Roger G. Dolorosa
College of Fisheries and Aquatic
Sciences,
Western Philippines University
Puerto Princesa City
5300 Philippines
Email:
rogerdolorosa@yahoo.com
The molluscan fauna (gastropods and bivalves)
and notes on environmental conditions of two
adjoining protected bays in Puerto Princesa City,
Palawan, Philippines
Rafael M. Picardal and Roger G. Dolorosa
Abstract
With the rising pressure of urbanization to biodiversity, this study aimed to obtain baseline information
on species richness of gastropods and bivalves in two protected bays (Turtle and Binunsalian) in Puerto
Princesa City, Philippines before the establishment of the proposed mega resort facilities. A total of 108
species were recorded, (19 bivalves and 89 gastropods). The list includes two rare miters, seven recently
described species and first record of Timoclea imbricata (Veneridae) in Palawan. Threatened species
were not encountered during the survey suggesting that both bays had been overfished. Turtle Bay had
very low visibility, low coral cover, substantial signs of ecosystem disturbances and shift from coral to
algal communities. Although Binunsalian Bay had clearer waters and relatively high coral cover,
associated fish and macrobenthic invertebrates were of low or no commercial values. Upon the
establishment and operations of the resort facilities, follow-up species inventories and habitat assessment
are suggested to evaluate the importance of private resorts in biodiversity restoration.
Keywords: Binunsalian Bay, bivalves, gastropods, Palawan, species inventory, Turtle Bay
1. Introduction
Gastropods and bivalves are among the most fascinating groups of molluscs that for centuries
have attracted hobbyists, businessmen, ecologists and scientists among others from around the
globe. Gastropods and bivalves with high economic importance are widely cultivated [1, 2].
Pearl oyster culture and pearl farming is a multi-million dollar industry [3, 4]. Some species (e.g.
Tectus niloticus) used in the production of pearl buttons had been transplanted outside their
natural range of distribution [5, 6], while efforts to restore the populations of overharvested
species are widely undertaken [7-10] to satisfy the rapidly increasing demands in the global
market.
Ecologically, the importance of molluscs cannot be underestimated. Grazing gastropods can
control ephiphytic and macro algal bloom [11-15]. Under laboratory condition, 20,000 juveniles
of hatchery produced gastropod Tectus (Trochus) niloticus of 4 – 7 mm in diameter can
consume sessile diatoms covering an area of 6.5 m2 within a week [16]. Bivalves as filter
feeders can help purify silted marine waters [17].
Although molluscs are of huge importance to the ecosystem and the society, not much is
known about the gastropods and bivalves of Turtle and Binunsalian Bays in Puerto Princesa
City, Province of Palawan, the Philippines. Both bays were declared as marine sanctuaries by
the City Government of Puerto Princesa in 1992 [18], but uncontrolled fishing activities could
have heavily impacted its molluscan fauna, a similar case for many paper marine sanctuaries in
the country [19].
Both bays are the proposed sites of a world class resort that any disturbance during the
construction stage and operational phase may have a long term effect on the composition and
abundance of these species. This study which sought to document the species richness of
molluscs (gastropods and bivalves) and provide notes on ecological conditions of Turtle and
Binunsalian Bays may serve as basis in proposing relevant conservation measures and could
be used as baseline in monitoring the impacts of any management interventions.

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2. Materials and Methods
The study was conducted in Turtle and Binunsalian Bays,
Puerto Princesa City, Palawan, Philippines (Figure 1). There
was a reconnaissance survey on 23 June 2014 to have a clear
picture of each site in terms of habitat and presence of
gastropods and bivalves. Examined areas during the
reconnaissance period were limited to shallow habitats with
corals and seaweeds. Between 27 June – 1 July 2014, night
sampling activities at different sites were conducted by
dredging at sandy-rubble and muddy habitats. During
sampling, a fish finder was used to avoid dredging over coral
reefs and sea grass beds which can both damage the dredge
and the reef ecosystems. Total dredging time was 12 h in
Turtle Bay and 6 h in Binunsalian Bay. The obtained samples
were identified based on various references [20-23]. We sought
the opinions of experts in confirming the identities of some
tentatively identified species.
Fig 1: The sampling sites in Turtle and Binunsalian Bays in Palawan, Philippines (source: Google Earth).
3. Results and Discussion
3.1. Species Richness
A total of 108 species of bivalves and gastropods were
recorded in Turtle and Binunsalian Bays. Of these, 19 species
were bivalves belonging to nine families (Table 1, Figure 2). A
total of 89 gastropod species belonging to 24 families were
also recorded (Table 2, Figures 3-6).
The number of bivalve species in Turtle Bay is higher (17
species) than in Binunsalian Bay (3 species). Such high

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number could be associated with the turbid waters of Turtle
Bay which supply the required food of bivalves plus an added
benefit of concealment from shellfish collectors. However, out
of 19 bivalve species, only four (21%) are utilized as food.
Notably, a few large (~20 cm) Atrina vexillum (Pinnidae),
Chama lazarus (Spondylidae), Decatopecten radula
(Pectinidae) and Maleus maleus (Isognomonidae) were noted
within Turtle Bay. Only the Timoclea costellifera (Veneridae)
occurred in both bays.
As for gastropods, only 27 species were recorded in Turtle Bay
while 65 species in Binunsalian Bay. In spite of such high
number, only six (6.7%) of the 89 gastropod species are
utilized for local consumption. These commercially exploited
species were also low in numbers. Only one or two individuals
per commercially exploited species were encountered during
the survey. Only three gastropod species: Canarium urceus
(Strombidae), Vexillum exasperatum (Costellariidae) and
Monetaria moneta (Cypraeidae) occurred in both bays.
Taking into account the total number (108 species) of bivalve
and gastropod species, lesser number (42 or 39%) were
recorded in Turtle Bay than in Binunsalian Bay (64 or 59%).
Such could be related to the wide sandy area in Binunsalian
Bay which directly faces the open sea.
Table 1: List of bivalves encountered in Turtle (TB) and Binunsalian (BB) Bays, Puerto Princesa City, Palawan, Philippines.
Bivalves
Family No. Species TB BB
Arcidae 1 Anadara uropigimelana (Bory St. Vincent, 1824) 
Isognomonidae 2 Isognomon isognomum (Linnaeus, 1758) 
3 Malleus malleus (Linnaeus, 1758) 
Mytilidae 4 Septifer excisus (Weigmann, 1837) 
Pectinidae 5 Decatopecten radula (Linnaeus, 1758) 
6 Juxtamusium coudeini (Bavay, 1903) 
7 Bractechlamys vexillum (Reeve, 1853) 
Pinnidae 8 Atrina vexillum (Born, 1778) 
Spondylidae 9 Chama lazarus Linnaeus, 1758 
Tellinidae 10 Tellin sp1 (white) 
11 Tellin sp2 (red) 
Veneridae
12 Fulvia subquadrata Vidal & Kirkendale, 2007 
13 Fulvia colorata Vidal & Kirkendale, 2007 
14 Lioconcha fastigiata (G. B. Sowerby II, 1851) 
15 Vasticardium elongatum enode (G. B. Sowerby II, 1840) 
16 Timoclea costellifera (Adams & Reeve, 1850)  
17 Paphia textile (Gmelin, 1791) 
18 Timoclea imbricata (G. B. Sowerby II, 1853) 
Corbulidae 19 Corbula tunicata Reeve, 1843 
Subtotal 19 17 3
Percentage 89 16
Table 2: List of gastropods encountered in Turtle (TB) and Binunsalian (BB) Bays, Puerto Princesa City, Palawan, Philippines.
Gastropoda
Family No. Species TB BB
Acteonidae 20 Pupa affinis (A. Adams, 1855) 
Buccinidae 21 Phos vandenberghi (Fraussen & Poppe, 2005) 
22 Pollia fumosa (Dillwyn, 1817) 
Bullidae 23 Bulla vernicosa (Gould, 1859) 
Cancellariidae 24 Scalptia articularis (G. B. Sowerby I, 1832) 
Cerithidae 25 Rhinoclavis aspera (Linnaeus, 1758) 
26 Rhinoclavis longicaudata (A. Adams & Reeve, 1850) 
Columbellidae 27 Mitrella floccata hanleyi (Deshayes, 1863) 
Conidae
28 Conus arenatus Hwass, in Bruguiere, 1792 
29 Conus magus Linnaeus, 1758 
30 Conus thalassiarchus G. B. Sowerby I, 1834 
31 Conus quercinus [Lightfoot], 1786 
32 Conus eburneus Hwass in Bruguière, 1792 
33 Conus tessulatus Born, 1778 
Costellariidae
34 Vexillum amandum (Reeve, 1845) 
35 Vexillum angustissimum (E. A. Smith, 1903) 
36 Vexillum collinsoni (A. Adams, 1864) 
37 Vexillum coronatum (Helbling, 1779) 
38 Vexillum dilectissimum (Melvill & Sykes, 1899) 
39 Vexillum exasperatum (Gmelin, 1791)  
40 Vexillum formosense (G. B. Sowerby III, 1889) 
41 Vexillum gruneri (Reeve, 1844) 
42 Vexillum michaui (Crosse & P. Fischer, 1864) 
43 Vexillum pelaezi Poppe, Tagaro & Salisbury, 2009 

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44 Vexillum perrieri (Dautzenberg, 1929) 
45 Vexillum scitulum (A. Adams, 1853) 
46 Vexillum spicatum (Reeve, 1845) 
47 Vexillum vibex (A. Adams, 1853) 
48 Vexillum virgo (Linnaeus, 1767) 
49 Vexillum xenium Pilsbry, 1921 
Cypraeidae
50 Erosaria labrolineata (Gaskoin, 1849) 
51 Palmadusta contaminata contaminata (Sowerby I, 1832) 
52 Palmadusta ziczac (Linnaeus, 1758) 
53 Purpuradusta gracilis (Gaskoin, 1849) 
54 Monetaria moneta (Linnaeus, 1758)  
55 Cypraea tigris (Linnaeus, 1758) 
56 Lyncina vitellus (Linnaeus, 1758) 
Epitoniidae 57 Epitonium alata (Sowerby II, 1844) 
Haminoeidae 58 Atys naucum (Linnaeus, 1758) 
59 Aliculastrum cylindricum (Helbling, 1779) 
Mitridae
60 Domiporta carnicolor (Reeve, 1844) 
61 Domiporta filaris (Linnaeus, 1771) 
62 Imbricaria conularis (Lamarck, 1811) 
63 Imbricaria olivaeformis (Swainson, 1821) 
64 Mitra maesta (Reeve, 1845) 
65 Scabricola alabaster (Sowerby, 1900) 
66 Scabricola ocellata (Swainson, 1831) 
67 Ziba bacillum (Lamarck, 1811) 
68 Ziba verrucosa foveolata (Dunker, 1863) 
Muricidae 69 Hexaplex cichoreum (Gmelin, 1791) 
70 Drupella margariticola (Broderip, in Broderip & Sowerby, 1833) 
Nassariidae
71 Nassarius gemmuliferus (A. Adams, 1852) 
72 Nassarius bicallosus (E. A. Smith, 1876) 
73 Nassarius coronatus (Bruguière, 1789) 
74 Nassarius sp. 
Naticidae
75 Natica buriasiensis Récluz, 1844 
76 Mammilla melanostoma (Gmelin, 1791) 
77 Tectonatica venustula (Philippi, 1851) 
78 Eunaticina papilla (Gmelin, 1791) 
Olividae 79 Oliva carneola (Gmelin, 1791) 
80 Olivella fulgurata A. (Adams & Reeve, 1850) 
Pyramidellidae 81 Syrnola fasciata (Jickeli, 1882) 
Ranellidae 82 Ranularia gutturnia (Röding, 1798) 
Strombidae
84 Canarium erythrinum (Dillwyn, 1817) 
85 Canarium urceus (Linnaeus, 1758)  
86 Conomurex luhuanus (Linnaeus, 1758) 
87 Dolomena pulchella (Reeve, 1851) 
88 Dolomena variabilis (Swainson, 1820) 
89 Euprotomus bulla (Röding, 1798) 
90 Lambis lambis (Linnaeus, 1758) 
91 Lentigo pipus (Röding, 1798) 
92 Terebellum terebellum (Linnaeus, 1758) 
93 Terestrombus fragilis (Röding, 1798) 
94 Varicospira crispata (G. B. Sowerby II, 1842) 
Terebridae
95 Hastulopsis pertusa (Born, 1778) 
96 Hastulopsis suspensa (E. A. Smith, 1904) 
97 Myurella kilburni (R. D. Burch, 1965) 
98 Strioterebrum arabellum (Thiele, 1925) 
99 Terebra funiculata (Hinds, 1844) 
100 Terebra subulata (Linnaeus, 1767) 
Trochidae
101 Rossiteria pseudonucleolus (Poppe, Tagaro & Dekker, 2006) 
102 Monilea belcheri (Philippi, 1849) 
103 Jujubinus geographicus Poppe, Tagaro & Dekker, 2006 
104 Pseudominolia tramieri Poppe, Tagaro & Dekker, 2006 
Turridae 105 Lophiotoma leucotropis (A. Adams & Reeve, 1850) 
106 Lophiotoma acuta (Perry, 1811) 
Vassidae 107 Vasum tubiferum (Anton, 1838) 
Xenophoridae 108 Xenophora cerea (Reeve, 1845) 
Subtotal 89 27 65
30 73
TOTAL 108 44 68
Percentage 41 63

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Fig 2: The bivalves of Turtle and Binunsalian Bays. 1. Anadara uropigimelana, 2. Isognomon isognomum, 3. Maleus maleus, 4. Septifer excisus,
5. Decatopecten radula, 6. Juxtamusium coudeini, 7. Bractechlamys vexillum.
The finding of the rare species Timoclea imbricata
(Veneridae) in Turtle Bay, and Vexillum vibex and Scabricola
alabaster (Mitridae) in Binunsalian Bay implies the presence
of unique niches in both bays and the potential use of these
species as ecological indicators. This is also the first record of
T. imbricata in Palawan. In addition, the list includes seven
species that have been only described between 2005 and 2009:
Fulvia subquadrata, Fulvia colorata (Veneridae); Phos
vandenberghi (Buccinidae); Vexillum pelaezi (Costellariidae);
Rossiteria pseudonucleolus, Jujubinus geographicus,
Psudominolia tramieri (Trochidae) (Tables 1 and 2). Such
continued discovery is suggesting that many species are yet
unknown to science. The number of species in the current list
is expected to increase with continued exploration and
documentation of gastropods and bivalves in both bays.
The combined number of species (108 species) from Turtle
and Binunsalian Bays were higher than those recorded from
the mangrove and estuarine (65 species) areas of Iwahig River
[24] but fewer compared with the more than 200 species in
offshore Tubbataha Reefs [25]. Unregulated harvesting can

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significantly affect the population of harvested species. For
example, poaching in Tubbataha Reefs had significantly
reduced the populations of the reef gastropod Tectus (Trochus)
niloticus [26, 27]. In Iwahig River, the abundance of the
mangrove clam Polymesoda erosa is lower in open accessed
areas compared to areas under the jurisdiction of the Iwahig
Penal Farm [28]. In Turtle and Binunsalian Bays, the reefs
appeared to have been stripped with commercially important
macrobenthic invertebrates. Threatened species such as giant
clams, topshells, sea cucumbers, tritons and helmet conchs
were not encountered, suggesting a relatively low abundance
in the area. With such low number of commercially important
gastropods and bivalves (10 species or 9.3% of the total
species), it is clear that both bays were overfished [29], and
shares the same condition of the so many paper marine
sanctuaries in the country [19]. This justifies the need to
strengthen/revise the conservation schemes employed
following the declaration of both bays as marine sanctuary
more than two decades ago.
Fig 3: The bivalves of Turtle and Binunsalian Bays. 8. Atrina vexillum, 9. Chama lazarus, 10. Tellin sp. 1 (white), 11. Tellin sp. 2 (red)
12. Fulvia subquadrata, 13. Fulvia colorata.

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3.2. Notes on Environmental Conditions
The water in Turtle Bay was generally turbid (~1-3 m
visibility) making it difficult to find the molluscs during the
reconnaissance survey. Dredging was difficult at the inner
shallow areas having deep muddy substrate. Such could be due
to soil erosion from the surrounding agricultural sloping fields
and inadequate water exchange because of small bay opening.
Hard coral cover at the reef crest was generally low (~10%).
There were lots of broken coral colonies and patches of rubble.
This condition could have been caused by anchors of fishing
boats that seek shelter during the day and in times of bad
weather. There appears a high nutrient load as manifested by
many coral colonies being gradually overtaken by green algae
such as Halimeda spp. and Caulerpa spp. There were also
some bleached corals. By contrast, Binunsalian Bay had
clearer (~5-8 m visibility) water possibly because of its rocky-
sandy coastline and wide opening which directly flushes the
silted water towards the Sulu Sea. Live coral cover was high
(~50%) yet devoid of commercially important fishes,
gastropods, bivalves and echinoderms. Not a single rock
boring giant clams were noted suggesting high level of
exploitation. Giant clams, topshells and other macrobenthic
reef invertebrates can be very visible in successfully managed
protected areas [9, 30, 31].
Measures to rehabilitate the damaged reefs [32] to restore the
lost ecological and economic values [33] must be set in place.
To hasten the recovery of lost species, reintroduction maybe
considered as the first option [5, 6, 10, 34, 35]. The restoration of
biodiversity through effective partnership among the local
government units, private entities and academe [9, 36-38] can
benefit the adjacent open accessed areas through spill-over
effects [39-41].
Fig 4: The bivalves of Turtle and Binunsalian Bays. 14. Lioconcha fastigiata, 15. Vasticardium elongatum enode, 16. Timoclea costellifera.

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Fig 5: The bivalves of Turtle and Binunsalian Bays. 17. Paphia textile, 18. Timoclea imbricata, 19. Corbula tunicata.

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Fig 6: The gastropods of Turtle and Binunsalian Bays. 20. Pupa affinis, 21. Phos vandenberghi, 22. Pollia fumosa, 23. Bulla vernicosa,
24. Scalptia articularis, 25. Rhinoclavis aspera, 26. Rhinoclavis longicaudata, 27. Mitrella floccata hanleyi.

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Fig 7: The gastropods of Turtle and Binunsalian Bays. 28. Conus arenatus, 29. Conus magus, 30. Conus thalassiarchus,
31. Conus quercinus, 32. Conus eburneus, 33. Conus tessulatus.

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Fig 8: The gastropods of Turtle and Binunsalian Bays. 34. Vexillum amandum, 35. Vexillum angustissimum, 36. Vexillum
collinsoni, 37. Vexillum coronatum, 38. Vexillum dilectissimum, 39. Vexillum exasperatum.

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Fig 9: The gastropods of Turtle and Binunsalian Bays. 40. Vexillum formosense, 41. Vexillum gruneri, 42. Vexillum michaui,
43. Vexillum pelaezi, 44.Vexillum perrieri, 45. Vexillum scitulum, 46. Vexillum spicatum 47. Vexillum vibex, 48. Vexillum virgo, 49. Vexillum
xenium.

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Fig 10: The gastropods of Turtle and Binunsalian Bays. 50. Erosaria labrolineata, 51. Palmadusta contaminata contaminata, 53. Purpuradusta
gracilis, 54. Monetaria moneta, 55. Cypraea tigris, 56. Lyncina vitellus.

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Fig 11: The gastropods of Turtle and Binunsalian Bays. 57. Epitonium alata, 58. Atys naucum, 59. Aliculastrum cylindricum, 60. Domiporta
carnicolor, 61. Domiporta filaris, 62. Imbricaria conularis, 63. Imbricaria olivaeformis, 64. Mitra maesta, 65. Scabricola
alabaster, 66. Scabricola ocellata, 67. Ziba bacillum, 68. Ziba verrucosa foveolata.

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Fig 12: The gastropods of Turtle and Binunsalian Bays. 69. Hexaplex cichoreum, 70. Drupella margariticola, 71. Nassarius gemmuliferus,
72. Nassarius bicallosus, 73. Nassarius coronatus, 74. Nassarius sp., 75. Natica buriasiensis, 76. Mammilla melanostoma, 77. Tectonatica
venustula, 78. Eunaticina papilla.

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Fig 13: The gastropods of Turtle and Binunsalian Bays. 79. Oliva carneola, 80. Olivella fulgurata, 81. Syrnola fasciata, 82. Ranularia
gutturnia, 83. Turritriton labiosus, 84. Canarium erythrinum, 85. Canarium urceus, 86. Conomurex luhuanus, 87. Dolomena pulchella.

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Fig 14: The gastropods of Turtle and Binunsalian Bays. 88. Dolomena variabilis, 89. Euprotomus bulla, 90. Lambis lambis, 91. Lentigo pipus,
92. Terebellum terebellum, 93. Terestrombus fragilis, 94. Varicospira crispata, 95. Hastulopsis pertusa, 96. Hastulopsis suspense,
97. Myurella kilburni, 98. Strioterebrum arabellum, 99. Terebra funiculata, 100. Terebra subulata.

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Fig 15: The gastropods of Turtle and Binunsalian Bays. 101. Rossiteria pseudonucleolus, 102. Monilea belcheri, 103. Jujubinus geographicus,
104. Pseudominolia tramieri, 105. Lophiotoma leucotropis, 106. Lophiotoma acuta, 107. Vasum tubiferum, 108. Xenophora cerea.
4. Acknowledgement
We are thankful to the management of Kamia Bay Resort,
Seven Seas Corporation and the Western Philippines
University for the logistical support. Thanks to the comments
and suggestions of Dr. Lota A. Creencia on the early draft of
this paper.
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