Garuda - Garba Rujukan Digital

MACROALGAE DIVERSITY AND LIFE FORMS OF INTER-TIDAL ROCKY SHORES Zakaria, Muta Harah; Chia, Wong Siaw; Bujang, Japar Sidik; Arshad, Aziz; Ogawa, Hisao
Marine Research in Indonesia Vol 32, No 2 (2007)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

A study on macroalgae diversity and life form was carried out at inter-tidal rocky shores of Similajau National Park, Bintulu, Sarawak. Thirty five species were identified in this study, of which 15 belong to the division Rhodophyta, 12 to the Chlorophyta and 8 to Phaeophyta. Fifteen species are new records to the Park. Irrespective of areas, macroalgae from the three divisions; Chlorophyta, Phaeophyta and Rhodophyta did not show any distinct zonation. There was high number of macroalgae species in rocky area related to the sandy area. The high representation of macroalgae from rocky area reflects the availability of stable substrate and microhabitats for the occurrence and diversity of macroalgae species. The sandy area lacks hard structure responsible for the relatively low diversity of macroalgae. Four types of macroalgae life forms were identified namely epilithic, epipelic, epizoic and epiphytic. The general distribution, occurrence and a list of the macroalgae is presented.

MACROALGAE DIVERSITY AND LIFE FORMS OF INTER-TIDAL ROCKY SHORES Zakaria, Muta Harah; Chia, Wong Siaw; Bujang, Japar Sidik; Arshad, Aziz; Ogawa, Hisao
Marine Research in Indonesia Vol 32 No 2 (2007)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

A study on macroalgae diversity and life form was carried out at inter-tidal rocky shores of Similajau National Park, Bintulu, Sarawak. Thirty five species were identified in this study, of which 15 belong to the division Rhodophyta, 12 to the Chlorophyta and 8 to Phaeophyta. Fifteen species are new records to the Park. Irrespective of areas, macroalgae from the three divisions; Chlorophyta, Phaeophyta and Rhodophyta did not show any distinct zonation. There was high number of macroalgae species in rocky area related to the sandy area. The high representation of macroalgae from rocky area reflects the availability of stable substrate and microhabitats for the occurrence and diversity of macroalgae species. The sandy area lacks hard structure responsible for the relatively low diversity of macroalgae. Four types of macroalgae life forms were identified namely epilithic, epipelic, epizoic and epiphytic. The general distribution, occurrence and a list of the macroalgae is presented.

A COMPARATIVE STUDY OF HEAVY METAL CONCENTRATIONS IN Nerita lineata FROM THE INTERTIDAL ZONE BETWEEN DUMAI INDONESIA AND JOHOR MALAYSIA Bintal Amin; Ahmad Ismail; Aziz Arshad; Che Kong Yap; M Salleh Kamarudin
JOURNAL OF COASTAL DEVELOPMENT Vol 10, No 1 (2006): Volume 10, Number 1, Year 2006
Publisher : JOURNAL OF COASTAL DEVELOPMENT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (342.253 KB)

The concentrations of Cd, Cu, Pb, Zn, Ni and Fe were determined in the marine gastropod Nerita lineata collected on May 2005 from the intertidal zone of fourteen stations in Dumai, Indonesia (mean length 21.43 – 24.04 mm) and ten stations in Johor, Peninsular Malaysia (mean length 22.61 – 26.60 mm). The results of the present study showed that metal concentrations in the shell, operculum and soft tissue of N. lineata varied at different sampling stations. The mean concentrations of Cd, Cu, Pb, Zn, Ni and Fe in the samples collected from Dumai were 4.14; 5.90; 44.43; 3.74; 20.73; 24.91 μg/g in shell; 4.16; 7.31; 51.78; 17.63; 23.52; 30.60 μg/g in operculum and 0.71; 15.16; 9.34; 94.69; 5.08; 397.96 μg/g dry weight in the total soft tissue; whilst those collected from Johor were 4.18; 5.06; 59.84; 4.8122; 19.29; 31.60 μg/g in shell; 4.73; 6.51; 60.57; 19.48; 20.68; 34.92 μg/g in operculum and 1.24; 18.02; 19.75; 95.09; 5.57; 473.56 μg/g dry weight in the total soft tissue, respectively. Samples of N. lineata from both Dumai and Johor tend to show similar trend in metal accumulation in which the concentrations of Cd, Pb and Ni decreased in the order: operculum > shell > soft tissue whilst Cu, Zn and Fe in the order of soft tissue > operculum > shell. In general, samples from Johor accumulated higher heavy metal concentrations when compared to samples from Dumai, except for Cu and Ni in the shell and operculum, which exhibited vice versa situation. Higher concentrations of metals were recorded in samples collected from the stations close to the industrial and anthropogenic activities. However, most of the concentrations were still comparable to the previous reported studies from other geographical areas.

DISTRIBUTION AND SPECIATION OF HEAVY METALS (Cd, Cu AND Ni) IN COASTAL SEDIMENTS OF DUMAI SUMATERA, INDONESIA Bintal Amin; Ahmad Ismail; Aziz Arshad; M Salleh Kamarudin
JOURNAL OF COASTAL DEVELOPMENT Vol 10, No 2 (2007): Volume 10, Number 2, Year 2007
Publisher : JOURNAL OF COASTAL DEVELOPMENT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (489.659 KB)

Heavy metal concentrations in sediment collected from Dumai coastal waters have been studied by using sequential extraction technique to determine the distribution and geochemical speciation (EFLE, acid reducible, oxidisable organic and resistant) of Cd, Cu and Ni. The results showed that the highest concentrations of total Cd was in Cargo Port area and the lowest in Penyembal, whilst for Cu and Ni the highest concentrations were in Ferry Port and the lowest in Batu Panjang. The total concentrations of Cd, Cu and Ni ranged from 0.65 – 1.82, 1.84 – 13.16 and 7.68 – 17.98 µg/g dry weight, respectively. Higher metal concentrations were detected in the eastern and central parts of Dumai city center where most of anthropogenic activities are concentrated. However, most of the concentrations of Cd, Cu and Ni were still below the ERL and ERM values. Only at few stations, especially in the eastern and central parts of Dumai, showed Cd concentrations exceed the ERL but still well below the ERM values. Metal concentrations in 78.26% (Cd) and 91.30% (Cu and Ni) of the sampling stations were dominated by resistant fraction indicating natural origin of these metals. Non resistant fractions, however, were found higher than resistant fractions at Pelintung, Pertamina, Cargo Port, Penyembal and Batu Panjang for Cd; Penyembal and Batu Panjang for Cu and Pelintung and Guntung for Ni. These findings indicated that anthropogenic inputs of Cd, Cu and Ni occurred in these stations. For all sampling site groups, Cd, Cu and Ni were mostly accumulated in the resistant fraction (55.28 – 58.31%; 65.02 – 91.84% and 50.08 – 66.88% of the total concentrations respectively) which indicated that the mobility and anthropogenic inputs of these metals in Dumai coastal waters were quite low.

POPULATION DYNAMICS OF THE GRAY EEL CATFISH Plotosus canius FROM PORT DICKSON, MALAYSIA Usman, Binta Isyaku; Moruf, Rasheed Olatunji; Amin, S. M. Nurul; Arshad, Aziz
Indonesian Fisheries Research Journal Vol 30, No 1 (2024): (June) 2024
Publisher : Jakarta Technical University of Fisheries

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/ifrj.30.1.2024.%p

Given the scarcity of information suitable for stock assessments of the Plotosidae, the study on growth and population dynamics of the Gray Eel Catfish Plotosus canius from the coastal waters of Port Dickson, Peninsular Malaysia was carried between January and December, 2021 and estimated using the ELEFAN I routine in FiSAT software. Estimated von Bertalanffy growth parameters were asymptotic length (L∞) = 67.20 cm, growth coefficient (K) = 0.95 yr-1, Predicted extreme length (Lmax) = 63.54, and growth performance index (φ’) = 3.63. The estimated total mortality (Z) value was 2.73 yr-1 during the study period. Natural mortality (M) and fishing mortality (F) were estimated at 1.31 yr-1 and 1.42 yr-1 respectively. The value of exploitation rate (E) obtained for P. canius was 0.48. Two major recruitment events were observed per year and the recruitment pattern was continuous. The findings from the analyses suggested that the P. canius fishery in the study area is slightly below the optimum level of exploitation. However, more research is suggested in such direction to corroborate the present findings as management for this fish is indispensable for maximum sustainable yield. The length-structured virtual population analysis revealed that P. canius fishery of Port Dickson experiences growth overfishing as opposed to recruitment overfishing, with fishing mortality being higher than natural mortality (F>M). Based on these findings, small-sized mesh fishing net and reduced fishing efforts (legal and illicit) must be enforced in order to maintain the potential of this commercially significant species in Port Dickson, Malaysia

Title

Found 5 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 5 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 5 Documents
Search