Papers by MOHD HANAFI IDRIS
A total of 135 individuals were collected from three different stations. Pinna bicolor and Pinna ... more A total of 135 individuals were collected from three different stations. Pinna bicolor and Pinna atropurpurea were dominance. Higher density of pen shells were recorded in St 1 with 0.027 ind/m and St 2 was recorded lower density with 0.004 ind/m at 22 Merambong Shoal. Univariate analysis at Merambong Shoal population recorded higher values for diversity and richness indices compared to Tanjung Adang Shoal and Merambong Island but the value of Evenness index was quite similar between the three stations. Fifty eight individuals of pen shell were collected from study areas for taxonomy identification. Seven groups of pen shell were identified base on the internal and external surface of the valves of pen shell. Seven species were clearly identified which Pinna and Atrina were dominant from the seagrass bed of Sungai Pulai, Peninsular Malaysia.
DOAJ (DOAJ: Directory of Open Access Journals), Apr 1, 2015
Basic taxonomic information forms the important basis for the documentation, resource management ... more Basic taxonomic information forms the important basis for the documentation, resource management and utilization of marine biodiversity such as seaweeds. A taxonomic assessment of seaweeds in the coastal areas of Bintulu, Sarawak, East Malaysia, was conducted monthly from May 2011 to May 2012. Species composition was recorded following NaGISA protocols, direct observation, and SCUBA and snorkeling techniques. A total of 54 species were identified, classified into Rhodophyta (23 species), Chlorophyta (16 species) and Phaeophyta (15 species). The highest abundance was recorded at Kuala Similajau (25 species) while the lowest was recorded at Kuala Nyalau (12 species). As the present study was conducted by examining species collected from both rocky shores and the reef area for the first time, a higher number of species was documented compared to previous studies conducted in the same general area but focusing only on particular habitats. Thirty species found in the current survey represent new records for the locality including some with economic potentials.
Journal of Environmental Biology, Sep 30, 2020
To investigate the species composition and diversity of fishes from the seagrass habitat in Lawas... more To investigate the species composition and diversity of fishes from the seagrass habitat in Lawas, Sarawak, Malaysia. Fishes were collected with an encircling gillnet net during the dry, wet and intermediate season of the year. Water characteristics were analyzed in-situ through analytical methods. A total of 60 fish species from 37 families were recorded in the seagrass ecosystem. Dominant species with highest total abundance observed were Lethrinus lentjan (12.83%), Hyporhamphus limbatus (8.50%) and Leiognathus equulus (8.33%). Cluster analysis revealed three fish species assemblages; Lethrinus lentjan and Lutjanus fulviflamma (dry season), Nibea soldadu, Platycephalus indicus and L. equulus (intermediate season), while Hyporhamphus limbatus, Gerres erythrourus, Thryssa hamiltonii, Gerres oyena, Sphyraena jello and Gnathanodon speciosus (wet-intermediate season). All indices (no. of species, diversity and evenness) showed an increasing trend from dry, wet to intermediate season. The seagrass ecosystem of Lawas harbours a rich and diverse group of fish communities indicating an important fishery resource habitat. The findings of this study provide baseline information on fish resources from this seagrass ecosystem, which will be useful for the conservation and management of its fish resources in the future. Fish diversity, Important species indices, Seagrass ecosystem, Species composition Species composition and diversity of fishes from the seagrass habitat of Lawas,
Borneo Journal of Resource Science and Technology, Dec 24, 2023
Terengganu has a large coastal and wetland area where it provides habitat for edible mollusc. The... more Terengganu has a large coastal and wetland area where it provides habitat for edible mollusc. The edible molluscs are one of the most important sources of animal protein for the local communities. The distribution of edible molluscs was studied in six districts of the Terengganu coastal waters between August 2020 and March 2022. In each district, samples were purchased from the wet market, fishing villages and roadside outlets every four months interval. A total of 1,043 individuals was observed and 23 species of edible molluscs were recorded from six districts of Terengganu representing 11 families. Bivalves were found to be dominated by 14 species from seven families. The family Cyrenidae (bivalve) was widespread in five districts where Geloina expansa, was recorded in almost all districts. Meanwhile, for gastropods, nine species from four families were found where Ellobiidae (gastropod) was dominant and the most common gastropod species was Faunus ater, which was found in four locations in Terengganu. These species have great commercial value in Terengganu districts as they are sought extensively as food by the locals and also represent one of their sources of financial survival, especially for those living near to coastal areas. This baseline study could serve as a future indicator for the sustainable management of fisheries resources and for further ecological studies.
International Journal of Fisheries and Aquatic Studies, 2015
Researches on salt marsh mangrove habitats as global carbon sink are increasing worldwide. Howeve... more Researches on salt marsh mangrove habitats as global carbon sink are increasing worldwide. However, uncertainties in measuring carbon sequestration capacity of the vulnerable subtropical South Asian coastal habitat thus obstructing the mapping sediment and carbon accumulation rate of their importance.The present investigation was carried out to assess the sedimentation and carbon accumulation rate in salt marsh and mangrove habitats in the vicinity of Sitakunda coast, Chittagong, Bangladesh. The data indicate that sedimentation rate was 22.76±2.56 mg/cm2/day in mangrove area, 63.52±7.42 mg/cm2/day in lower mangrove area, 97.02±6.64 mg/cm2/day in higher marsh area, 5.91±1.16 mg/cm 2/day in lower marsh area and 9.81±0.03 mg/cm2/day in muddy area. The average sedimentation rate was found 39.82±6.72 mg/cm2/day during the study period. Soil organic matter in the newly deposited sediment was 3.89±1.28%, while 3.57±0.77% in accumulated peat sediment.Organic carbon of the newly deposited se...
Regional Studies in Marine Science
The diversity and composition of macrofaunal communities are important components to understand t... more The diversity and composition of macrofaunal communities are important components to understand the mangrove ecosystem structures and functions. To understand the seasonal distribution of macro-infaunal community and diversity, this study was conducted from July 2019 to February 2020 in the intertidal mangrove forest of Punang-Sari-River estuary, Lawas, Sarawak. Sampling was carried out during post-monsoon, intermediate-September, pre-monsoon, and monsoon. It was observed that, the seasonal physico-chemical parameters were significantly (P < 0.05) different, including the temperature, salinity, rainfall, pore water nitrogenous compounds (NO2, NO3 and NH3-N), phosphate and micro minerals. A total of 39 infaunal macrobenthos taxa from 27 families were recorded while the mean abundance of infaunal macro benthos was found higher in monsoon (997.29 individuals/m2). The most abundant, the highest important species index and percentage contribution species was Bivalvia Eurytellina lineata (W. Turton, 1819) due to year-round favorable ecological condition. Seasonal faunal grouping suggested post-monsoon, intermediate-September and pre-monsoon were comparable in species and individual abundance. The Simpson, and Shannon indices were found significantly (P < 0.0001) higher in monsoon, while Margalef richness was found higher in pre-monsoon. The soil was sandy loam with major portion of sand, and positively correlated with sand and infaunal abundance in all seasons. The ANOSIM and SIMPER analysis suggested that the highest species abundance similarity was observed between post-monsoon and pre-monsoon, while the highest dissimilarity was observed between intermediate-September and pre-monsoon. The Canonical Correspondence Analysis results suggested, a number of species were influenced by ecological factors, for instance, salinity, soil pH, PO4, micro–macro minerals, water pH, and nitrogenous compounds. The relationship within benthic infaunal abundance in the mangrove ecosystem with their seasonality, ecological variables, and soil properties were established and addressed in this study.
JOURNAL OF SUSTAINABILITY SCIENCE AND MANAGEMENT
Most fishermen worldwide, including in Kuala Marang, prefer the profitsharing system than fixed p... more Most fishermen worldwide, including in Kuala Marang, prefer the profitsharing system than fixed pay. However, profit-sharing is said to be unfair as it exploits the fishing crew and causes an income gap between the fishing boat owners and ordinary crew, which is one of the reasons why there are rich and poor fishermen. This research studied the inequality in fishermen's profit-sharing system between vessel owners and crew. Qualitative method were used, where 89 fishermen in Kuala Marang were randomly selected by Slovin's formula for interview. By descriptive analysis, the detailed patterns of the profit-sharing system. This study found four main types of fishing gears used: purse seine, gill net, hook and lines, and traps. While there were two patterns of profit-sharing practiced for each gear. This analysis shows that the profit-sharing system causes income inequality as all vessel owners gained a far higher profit than the crews. For purse seine, the owner, captain, operator and crew with profit-sharing Pattern 1 received profit of 50%, 5%, 5% and 3.33%, respectively while those with Pattern 2 received 52%, 8.5%, 3.8% and 2.5% respectively. For gill net, the owner and crew with Pattern 1 received profit of 66.67% and 33.33% respectively while those with Pattern 2 received 75% and 25% respectively. Hook and lines owners and crews with Pattern 1 of profit sharing received profit of 40% and 30% respectively while those with Pattern 2 received 66.67% and 16.67% respectively. Trap owners and crews with Pattern 1 of profit sharing received profit of 50% and 12.5% respectively while those with Pattern 2 received 33.33% and 16.67% respectively. This research also concluded that policy imperfections contribute to the inequality in the profitsharing system.
Sains Malaysiana, 2009
Sampel Pinna bicolor Gmelin dan Pinna deltodes Menke telah dipungut di kawasan rumput laut Sungai... more Sampel Pinna bicolor Gmelin dan Pinna deltodes Menke telah dipungut di kawasan rumput laut Sungai Pulai yang merangkumi Beting Merambong, Beting Tanjung Adang dan Pulau Merambong di perairan barat daya Johor, Malaysia bagi kajian morfologi bermula pada Ogos 2005 ...
Journal of sustainability science and management, Oct 31, 2022
Ecological Engineering & Environmental Technology
Catching is one way to get Short necked-clam so the demand also increases. The gonadosomatic inde... more Catching is one way to get Short necked-clam so the demand also increases. The gonadosomatic index (GSI) of short necked-clam is a study to maintain the availability of short-necked-clam in waters. Another thing that can be obtained from this study is to know its relation to the ecological status (quality of water, substrate, and the abundance of plankton) in the waters of Sedati, Indonesia. The strategy utilized in deciding the choose point is based on the purposive inspecting strategy did some time recently with attempting to take samples at a few point within the range of brief necked-clam angling ground. To decide the relationship of the environmental status with GSI used regression, and correlation is further illustrated by descriptive statistical analysis. Based on the regression analysis, water quality has a relationship to the gonadosomatic index of short-necked clam either directly with a value of-0.1278 or through nutrients that are worth 0.6813. While the nutrient has a relationship to the gonadosomatic index of-0.99583 and substrate of 0.2525. The results showed ecological status that correlates most strongly is plankton abundance of 94.39% (very strong) but negative correlated, with dissolved oxygen of 83.92% (very strong) and with the temperature of 62,98% (strong).
Ocean Science Journal
Area of the Coral Triangle (CT), namely Indonesia, Malaysia, Papua New Guinea, Philippines, Solom... more Area of the Coral Triangle (CT), namely Indonesia, Malaysia, Papua New Guinea, Philippines, Solomon Islands, and Timor-Leste, comprises 5.7 million km2 of the Pacific Ocean. It is one of the most bio-diverse marine eco-regions on the planet, as well as a global hotspot for seagrass species. Many sea creatures of this eco-region rely on the seagrass ecosystem, especially dugong species extensively (a total number of 2279 individuals), sea turtles (4–6 species), benthic organisms, and fish. Apart from these ecological services, carbon sequestration (2.6 billion Mg CO2 storage) by the seagrass ecosystem is considerably higher in comparison to terrestrial vegetation. In this paper, we scrutinized previously acknowledged seagrass species distribution, the associated fauna in seagrass meadows, the total carbon sequestration in the Coral Triangle, past and present research conducted on seagrass and other aspects, and major threats to seagrass ecosystems within this biogeographic region. Depending on their different locations, the six CT countries have a minimum of 10 to a maximum of 19 seagrass species that belong to four distinct families (Hydrocharitaceae, Cymodoceaceae, Zosteraceae, and Ruppiaceae) and cover almost 58,550.63 km2. While a total of 21 species of seagrass have been found throughout this eco-region, very little research has been conducted to assess the overall status of the ecosystems within this eco-region. Seagrass ecosystems and services from these habitats within the Coral Triangle are also associated with 100 million human inhabitants, who are supported directly or indirectly by the resources of this ecosystem. These inhabitants may cause considerable disturbance to seagrass ecosystems. For the long-term sustainable management and conservation of these ecosystems, two types of threats, namely local human activities and global transboundary issues including climate change, have been identified and need to be taken into consideration. In terms of human activities, local threats include water quality deterioration due to sewage and pollutant discharge, agricultural activities mainly from palm oil plantations, over-exploitation of seagrass-associated resources, sediment runoff, and destructive fishing practices. Global threats comprise macro and microplastics, sea-level rise due to climate change, global warming, and acidification. Further study of social, cultural, and economic interaction between the local inhabitants and seagrass ecosystems is highly recommended for assessing the ecological and economic contribution of this habitat to the human societies of the Coral Triangle. Despite their importance for human food services and the maintenance of the food web for marine and coastal animals, human activities have a negative impact on seagrass ecosystems around the world, particularly in the Coral Triangle.
Songklanakarin Journal of Science and Technology (SJST), 2015
Three common species of Corbiculidae (Polymesda erosa, P. bengalensis and P. expansa) can be foun... more Three common species of Corbiculidae (Polymesda erosa, P. bengalensis and P. expansa) can be found inhabiting the mangrove areas in Southeast Asia. The morphometric variations of three species were examined based on 15 morphometric characters. A total of 16 populations from six localities were analyzed in the present study. Analysis of variance had revealed significant differences (P<0.05) for LCT/SL and VPM/SL for proportion ratio on morphometric variables among species. Cluster analysis for these populations formed two groups at 70% of similarity. Morphometric characteristics, such as LCT and VPM, of Corbiculidae are proposed to differentiate these three species.
Journal of Threatened Taxa, 2021
Species checklists enlist the species existing within a distinct geographical biome and assist as... more Species checklists enlist the species existing within a distinct geographical biome and assist as an indispensable input for evolving conservation and administration strategies. The arenas of conservation ecology and biology face the challenge of exaggerated biodiversity, accredited to the non-recognition of taxonomic inconsistencies. The study’s goals are to organize all scattered taxonomic information regarding bivalve molluscs from Malaysian Borneo, i.e. Sarawak and Sabah, under one umbrella. Available literature regarding Malaysian Borneo was reviewed. The published taxonomic data on bivalve species, conservation status, inconsistencies, habitats (marine, fresh, and brackish), research aspects, threats, and conservation strategies are presented. A critical review of the checklists and distributional records of the class Bivalvia from Malaysian Borneo and subsequent validation of species names with the World Register of Marine Species (WoRMS) database revealed that currently 76 b...
Journal of Fisheries and Aquatic Science, 2017
Forest Science and Technology, 2015
Mangrove estuaries are claimed to be productive and important breeding grounds for fishery resour... more Mangrove estuaries are claimed to be productive and important breeding grounds for fishery resources. The role of particulate organic matter (POM), especially derived from decomposed litter detritus, is well documented in mangrove estuaries. However, being a primary producer, phytoplankton may play a significant role, which has not been well discussed, in governing the productivity of mangrove estuaries. Based on relevant published literature, this paper focuses on the role of phytoplankton in mangrove estuaries in the tropical coastal region and their interdependency. Analysis reveals that there are two-way interactions between phytoplankton and mangrove estuaries. The POM enriched water in mangrove estuaries acts as an ideal medium for phytoplankton succession. Simultaneously, diversified phytoplankton assemblages play a significant role in the food web of the estuarine mangrove ecosystem. Biomass and diversity of phytoplankton are influenced by nutrient and environmental parameters in mangrove estuaries and, concurrently, phytoplankton play a significant role in fish diversity and primary production in the same system. This review reveals that the inconsistent relationships between mangroves and coastal production could probably be due to the influence of seasonal changes. This paper unveils the latent potential and role of phytoplankton in tropical mangrove estuaries, which could be a source of thought for future research in this arena.
Biotropia: The Southeast Asian Journal of Tropical Biology, Dec 15, 2022
Molecular study is important to detect variations and similarities among species from the same ge... more Molecular study is important to detect variations and similarities among species from the same genus, in case if they do not encompass any morphological or physiological differences. The study was conducted to differentiate among species of Meretrix spp. (Meretrix lyrata, M. meretrix, and M. lusoria) obtained from two locations in Malaysia through the phylogenetic tree. The adductor muscle tissues were used to extract DNA and to perform other procedures; the samples were subjected to analyses using PCR and gel electrophoresis. The multiple sequence comparison was conducted by MUSCLE and the phylogenetic relationships were established using Maximum Likelihood (ML) statistical methods with MEGA 6.0 statistical software. M. lyrata samples showed 99% similarity to the three accessions sequence, where M. lyrata indicated 87% similarities, and M. meretrix showed not more than 89% similarities from the deposited sequence. The nucleotide base composition sequences consisted of the mean of Thiamine (T) 37.9%, Cytosine (C) 15.4%, Adenine (A) 27.4%, and Guanine (G) 19.4%. Maximum Likelihood (ML) analysis was conducted using the Tamura 3-parameter model to establish five major clades on Meretrix spp. and two out-groups clades significantly different from the Meretrix spp. These major clades were closely related to each other at the 50% evidence of bootstrap, which grouped as genus Meretrix. The present study on Meretrix spp. from the Sarawak locality was able to differentiate COI sequences between M. lyrata, M. meretrix, and M. lusoria. M. lusoria was close related to M. meretrix with strong bootstrap supporting evidence at 96% scoring. Moreover, M. lyrata was inferred as the ancestor to M. meretrix, and M. lusoria from Sarawak, Malaysia.
Biotropia, Dec 15, 2022
Molecular study is important to detect variations and similarities among species from the same ge... more Molecular study is important to detect variations and similarities among species from the same genus, in case if they do not encompass any morphological or physiological differences. The study was conducted to differentiate among species of Meretrix spp. (Meretrix lyrata, M. meretrix, and M. lusoria) obtained from two locations in Malaysia through the phylogenetic tree. The adductor muscle tissues were used to extract DNA and to perform other procedures; the samples were subjected to analyses using PCR and gel electrophoresis. The multiple sequence comparison was conducted by MUSCLE and the phylogenetic relationships were established using Maximum Likelihood (ML) statistical methods with MEGA 6.0 statistical software. M. lyrata samples showed 99% similarity to the three accessions sequence, where M. lyrata indicated 87% similarities, and M. meretrix showed not more than 89% similarities from the deposited sequence. The nucleotide base composition sequences consisted of the mean of Thiamine (T) 37.9%, Cytosine (C) 15.4%, Adenine (A) 27.4%, and Guanine (G) 19.4%. Maximum Likelihood (ML) analysis was conducted using the Tamura 3-parameter model to establish five major clades on Meretrix spp. and two out-groups clades significantly different from the Meretrix spp. These major clades were closely related to each other at the 50% evidence of bootstrap, which grouped as genus Meretrix. The present study on Meretrix spp. from the Sarawak locality was able to differentiate COI sequences between M. lyrata, M. meretrix, and M. lusoria. M. lusoria was close related to M. meretrix with strong bootstrap supporting evidence at 96% scoring. Moreover, M. lyrata was inferred as the ancestor to M. meretrix, and M. lusoria from Sarawak, Malaysia.
Biodiversitas Journal of Biological Diversity
Mangroves in lagoon habitats play an important role in ecosystem functions. Many studies on mangr... more Mangroves in lagoon habitats play an important role in ecosystem functions. Many studies on mangrove habitats are available in coastal habitats However, the information on the lagoon ecosystems in tropical climates is scanty, especially regarding their vegetation and carbon storage. This study was carried out to assess the status of species diversity, composition, zonal structure, and carbon storage of mangrove vegetation in Setiu lagoon, Malaysia. We used the transect line plot method in representative landward and small fringe island areas. The results showed that the floristic diversity of mangroves comprised 18 true mangroves and 11 associates, of which Avicennia rumphiana and Ceriops decandra were listed as threatened by IUCN. The stem density and basal area ranged from 1533 to 3800 individuals. ha-1 and 18.98-37.97 m 2 ha-1 , respectively. The mean tree diameter was 9.80 ± 2.85 cm, with a tree height of 10.35 ± 2.14 m. The mangrove species with the highest importance value index (IVI) was Rhizophora mucronata with 134.86, while the lowest was Acanthus ebracteatus with 13.23. The study revealed that small fringe islands in the lagoon were more diverse, with biodiversity index values always higher than the landward zone. Total biomass from the dominant mangrove species was estimated at 522.9 t ha-1 with an estimated carbon storage of 261.45 t ha-1 and a sequestration potential of 959.54 t CO2 ha-1. Compared to the other mangrove ecosystems elsewhere, this study recommends that the Setiu lagoon should be considered as a healthy and newly generated mangrove forest. Therefore, proper monitoring is needed to ensure mangrove ecosystem health and function.
Borneo Journal of Resource Science and Technology
Information on fisheries resources in East Malaysia is scarce and poorly known. The current revie... more Information on fisheries resources in East Malaysia is scarce and poorly known. The current review aims to compile a checklist of fisheries resources in the Northwest Borneo (Sarawak, Malaysia) from available published literature, address the resources' present status, and suggest future monitoring needs for selected critical species. The study also aims to determine several Sarawak land-use issues that are in flux and responsible for habitat degradation. Five hundred sixty-four species belonging to 123 families and 32 orders were recorded from Sarawak waters. Freshwater fish species comprised 48.0% of the total, followed by a marine (36.6%), marine-euryhaline (12.9%), and brackish water (2.5%) species. Of this, Cyprinidae was the most dominant group accounting for the greatest number of species (82 species), followed by Balitoridae (34 species), Bagridae (21 species) and Penaeidae (21 species). Therefore, available fisheries resources should be managed carefully as 48 species (...
Despite various efforts taken by the Malaysian Government, water quality degradation in Malaysian... more Despite various efforts taken by the Malaysian Government, water quality degradation in Malaysian rivers remains unsolved. There is an urgent need to conduct detailed studies on water quality condition from various land-use of Malaysia. A total of 756 water samples was collected from upstream, middle stream and downstream of river at each study area. Water quality was interpreted using National Water Quality Standard and Water Quality Index developed by the Department of Environment Malaysia and analysis implemented according to Standard Methods for the Examination of Water and Wastewater by APHA was followed. The physico-chemical variables of river water of dam (Bakun), oil palm plantations (Lawas II) and agricultural area (Lawas III) were under Class III (moderate water quality) status; while river water at logging area (Mukah) was under Class IV (slightly polluted). The most influencial variables that cause the deterioration of water quality is moderately low dissolved oxygen; hi...
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Papers by MOHD HANAFI IDRIS