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All Journal Scripta Biologica
Mahadi Mohammad
School of Biological Sciences; Centre for Marine and Coastal Studies, Universiti Sains Malaysia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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A CHECKLIST OF FREE-LIVING MARINE NEMATODES AT DIFFERENT ECOSYSTEM IN NORTHERN STRAITS OF MALACCA, MALAYSIA Shakila Samad; Mahadi Mohammad; Sazlina Salleh; Aqilah Darif
Scripta Biologica Vol 5, No 1 (2018)
Publisher : Fakultas Biologi | Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1678.009 KB) | DOI: 10.20884/1.sb.2018.5.1.667

Abstract

Nematodes present in all substrates and sediment types with an enormous number of species. The studies on free-living marine nematodes are still limited in Malaysia. The present study provides general information on genus checklist of free-living marine nematodes in the northern part of Peninsular Malaysia in a different ecosystem which are intertidal zones of estuarine, sandy beach and mangrove ecosystems.  Samples were randomly collected at three stations in each ecosystem. A total of 34 genera (22 families and ten suborders) were recorded in three ecosystems. Each ecosystem had common genera which also commonly found worldwide. Viscosia genus was observed in all three ecosystems. The nematode genera of Estuary and mangrove ecosystems had greater similarities than those in the sandy beach.
PRELIMINARY OBSERVATION OF TROPICAL DIATOM Thalassiosira spp. FROM TELUK BAHANG, PENANG Aysha Javeed; Sazlina Salleh; Aqilah Darif; Mahadi Mohammad
Scripta Biologica Vol 5, No 1 (2018)
Publisher : Fakultas Biologi | Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2337.489 KB) | DOI: 10.20884/1.sb.2018.5.1.668

Abstract

This study describes the morphological structure of Thalassiosira spp. found in coastal water and intertidal area of Teluk Bahang, Penang. Examination of the samples collected from January 2015 to June 2016 showed that these species were the common genera in both benthic and surface seawater at Teluk Bahang. To obtain phytoplankton samples, five liters of seawater were filtered through the plankton net (35 µm). While for benthic samples, the samples were collected at sediment surface of 1 mm depth. Samples of Thalassiosira spp. were obtained from both phytoplankton and benthic samples. Scanning electron microscope (SEM) was used to study the morphology of Thalassiosira spp. Results from the SEM showed distinct differences in areolae pattern, sizes, position and number of processes among Thalassiosira spp. (Thalassiosira nanolineata, Thalassiosira densannula, and Thalassiosira gravida). Thalassiosira densannula and Thalassiosira nanolineata were found in both habitats, coastal and benthic area while Thalassiosira gravida was found only in coastal water. Thalassiosira spp. contribute approximately 15% of the total benthic community and approximately 35% of the total phytoplankton community.
Co-Authors Aqilah Darif Aqilah Darif Aysha Javeed Sazlina Salleh Sazlina Salleh Shakila Samad