Alvin Jeyanathan Chelliah (2009) Diversity and abundance of selected cryptic invertebrates In reef habitats off Pulau Layangan, Pulau Dinawan and Pulau Sepangar, Sabah. Universiti Malaysia Sabah. (Unpublished)
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Abstract
The abundance and diversity of selected cryptic invertebrates in Pulau Layangan, Pulau Dinawan and Pulau Sepangar were determined using Invertebrate Belt Transects of 20 m length and 5 m width. The belt transects were laid at depths of 5 m and 10 m and in coral reefs as well as reef rubble. A total of eight invertebrate belt transects were laid in each island at four different reef sites. A total of 26 species of selected cryptic invertebrates were found in the three study areas. Pulau Layangan had 20 species, Pulau Dinawan 11 species and five species in Pulau Sepangar. Out of the 26 found species, one species was giant clam and three were flatworms while the other 22 species were nudibranchs. Pulau Dinawan had the highest abundance of selected cryptic invertebrates (28 ind/400m²), followed by Pulau Layangan (23 ind/400m² ) and finally Pulau Sepangar (14 ind/400m²). Fryeria picta was the most abundant species of cryptic invertebrates, followed by Phyllidiella pustulosa and these were the only two species found in all three study areas. Depth differences of 5 m and 10 m and reef substrate did not result in large difference in abundance or diversity. This same pattern was seen in all islands where, 36 individuals from 12 species were found at 5 m depth compared to 29 individuals from nine species at I O m depth. In total 29 individuals from nine species were found in coral reefs and 36 individuals from 11 species in reef rabbles. Shell measurements of Tridacna squamosa clams showed that clams in Pulau Sepangar were the smallest and were approximately 2-3 years old. In Pulau Layangan the estimated age was about 3-4 years old and the largest clams from Pulau Dinawan, with an average size of 23. 7 5 cm were estimated to be approximately 5-6 years old.
| Item Type: | Academic Exercise |
|---|---|
| Keyword: | Abundance, Diversity, Reef habitats, Pulau Layangan, Pulau Dinawan, Pulau Sepangar |
| Subjects: | Q Science > QH Natural history > QH301-705.5 Biology (General) > QH540-549.5 Ecology |
| Department: | SCHOOL > School of Science and Technology |
| Depositing User: | DG MASNIAH AHMAD - |
| Date Deposited: | 17 Aug 2023 12:04 |
| Last Modified: | 17 Aug 2023 12:04 |
| URI: | https://eprints.ums.edu.my/id/eprint/36529 |
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