Sains Malaysiana 39(2)(2010): 199–207
Taburan Ostracoda Resen di
dalam Sedimen Luar Pantai Sekitar Pulau
Besar, Johor
(Distribution
of Recent Ostracoda in Offshore Sediment Around Pulau Besar, Johor)
Ramlan
Omar* & Noraswana Nor Faiz
Pusat
Pengajian Sains Sekitaran dan Sumber Alam
Fakulti
Sains dan Teknologi, Universiti Kebangsaan Malaysia
43600 UKM Bangi, Selangor, Malaysia
Diserahkan:
8 April 2009 / Diterima: 29 September 2009
ABSTRAK
Kajian
mengenai taburan ostrakod di dalam sedimen luar pantai telah dijalankan sekitar
Pulau Besar, Johor. Sebanyak 11 stesen telah dipilih sebagai stesen
pensampelan. Sebanyak 47 spesies ostrakod hidup dan mati daripada 37 genus dan
18 famili telah dikutip dan dikenal pasti. Sebanyak 1036 spesimen mati dan 932
spesimen hidup telah dijumpai di kawasan kajian. Spesies yang paling dominan
adalah Pistocythereis cribriformis dan
famili yang paling dominan ialah Trachyleberididae. Famili yang mempunyai
kepelbagaian spesies terbanyak ialah Trachyleberididae dengan 14 spesies.
Beberapa parameter fiziko-kimia telah diukur secara in-situ terdiri
daripada suhu, saliniti, oksigen terlarut, pH dan kedalaman. Julat bagi setiap
parameter masing-masing adalah 27.05-30.80oC, 31.20-34.01 ppt, 6.90-11.93 mg/L dan 6.60-20.50 m. Bagi
parameter fiziko-kimia ex-situ seperti peratus
bahan organik, pasir, lodak dan lempung dengan julat bagi setiap parameter
masing-masing adalah 1.98-7.58%, 74.87-95.05%, 0.05-24.21% dan 0.75-9.74%.
Tekstur sedimen di kawasan kajian boleh dikelaskan kepada pasir berlodak, pasir
sangat halus, pasir halus, pasir sederhana dan pasir kasar. Indeks
Shannon-Wiener, H(S) yang paling tinggi dicatatkan pada stesen ST 6 dengan 2.91 dan paling rendah pada stesen ST 11 iaitu 2.26. Kelimpahan dan kepelbagaian ostrakod adalah
berkait dengan ciri-ciri sedimen. Peratus lodak menunjukkan korelasi positif
yang signifikan manakala suhu dan peratus pasir menunjukkan korelasi negatif
yang signifikan dengan kelimpahan ostrakod bentos. Parameter-parameter
fiziko-kimia yang lain tidak menunjukkan hubungan yang signifikan.
Kata kunci:
Ciri-ciri sedimen; dominan; kelimpahan; kepelbagaian; ostracoda
ABSTRACT
The study
on distribution of ostracods in offshore sediment was made around Pulau Besar,
Johor. A total of 11 stations were chooser. A total of 47 species, both living
and dead belonging to 37 genera and 18 families were collected and had been
identified. A total of 1063 dead specimens and 932 living specimens of
ostracoda were found in the study area. The dominant species was Pistocythereis cribriformis and the dominant family was
Trachyleberididae. Family that had the most high species diversity was
Trachlyeberididae with 14 species. Several physico-chemical parameters were
measured in-situ including temperature, salinity, dissolved oxygen and
depth. The values for each of these parameters range from 27.05-30.80oC, 31.20-34.01 ppt, 6.90-11.93 mg/L and 6.60-20.50 m,
respectively. For ex-situ physico-chemical
parameters such as percentage of organic matter, sand, clay and silt with the
range values for each parameter were 1.98-7.58%, 74.87-95.05%, 0.05-24.21% and
0.75-9.74%, respectively. The sediment texture in this study area can be
categorized as silty sand, very fine sand, fine sand, medium sand and coarse
sand. Shannon-Wiener diversity Index, H(S) was highest at ST 6 station with 2.91 and lowest at ST 11 station with 2.26. The abundance and diversity of ostracod
were most related to the character of the sediment. The percentage of silt were
positively and significantly correlated with the abundance of ostracods while
temperature and percentage of sand are negatively and significantly correlated
with benthic ostracod abundance. Other parameters do not show any significant
correlation.
Keywords:
Abundance; character of the sediment; dominant diversity; ostracoda
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*Pengarang
untuk surat-menyurat; email: rbo@ukm.my