Diversity and chemotaxonomy of seaweeds in the waters of Pulau Gaya

Chua , Jen Keat (2014) Diversity and chemotaxonomy of seaweeds in the waters of Pulau Gaya. Universiti Malaysia Sabah. (Unpublished)

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Abstract

Tunku Abdul Rahman Marine Park holds a wealth of marine flora and fauna of enormous importance for the health of marine ecosystem in Sabah. Coastal waters in the vicinity of Pulau Gaya are perhaps the most Important niche for the existence of seaweed and corals. The objectives of this study are to study the diversity of seaweeds and its distribution in the waters of Pulau Gaya and to investigate the presence of chemotaxonomical markers of selected species of seaweeds. Eight transect lines surrounding Pulau Gaya were provided to study the diversity of seaweeds and its distribution. A total of 47 samples were collected and 30 samples were further subjected into chemotaxonomy to investigate the presence of chemotaxonomical markers. Herbariums were made and voucher specimens were deposited at BORNEENSIS Herbarium (BORH), Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah. The seaweeds composition observed at the eight transect lines set up around Pulau Gaya are 44.91% Rhodophyta, 34.15% Ochrophyta (Phaeophyta), and 20.95% Chlorophyta. According to Simpson's Diversity Index (D), both Base Camp Reef (Transect 2) and Polish Reef (Transect 8) show highest value which is 0 = 0.89 whereas Tg. Wokong Reef (Transect 4) is the lowest among the eight transects which is 0 = 0.77. The Shannon-Wiener Index (H') shows that both Sapi Reef (Transect 1) and Polish Reef (Transect 8) have the highest value which is H' = 2.35. Moreover, Tg. Wokong Reef (Transect 4) and Malohom Reef (Transect 5) are both the lowest with a value of H' = 1.92. Also, Tg. Wokong Reef (Transect 4), Malohom Reef (Transect 5), and Tavajun Reef (Transect 6) show abundance of genus Eucheuma which may due to the anthropogenic impact on the environment. On the other hand, 30 samples were subjected to Thin layer Chromatography to show the chemical profile In the crude extract collected. Three samples of Caulerpa serrulata (S46), (aulerpa racemosa (S47), and Caulerpa sertularioides (S48) were further subjected Into High Performance liquid Chromatography and show the presence of caulerpin compound at retention time of 17.4 min. This compound was further subjected into Nuclear MagnetiC Resonance and the structure was elucidated and proven according to previous literature review. It can be concluded that caulerpin found In this research was the chemotaxonomical markers for the genus Caulerpa.

Item Type:Academic Exercise
Uncontrolled Keywords:Pulau Gaya, seaweed, diversity, chemotaxonomical, caulerpin, genus Caulerpa
Subjects:Q Science > QH Natural history > QH301 Biology
Divisions:FACULTY > Faculty of Science and Natural Resources
ID Code:13309
Deposited By:IR Admin
Deposited On:02 Jun 2016 09:53
Last Modified:02 Jun 2016 09:53

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