Article Per Year (5 Year)
p-Index From 2021 - 2026
0.444
P-Index
This Author published in this journals
All Journal JURNAL PESISIR DAN LAUT TROPIS
Rignolda Djamaludin
Program Studi Ilmu Kelautan, Fakultas Perikanan dan Ilmu Kelautan, Universitas Sam Ratulangi, Manado.
Earth & Planetary Sciences

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
CHARACTERISTIC OF LITORAL SEDIMENT ON SINDULANG SATU COASTAL Korwa, Junet I. S.; Opa, Esry T.; Djamaludin, Rignolda
JURNAL PESISIR DAN LAUT TROPIS Vol 1, No 1 (2013): JURNAL PESISIR DAN LAUT TROPIS
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jplt.1.1.2013.1630

Abstract

Coastal area is defined as the interface point where sea and land meet. To the land the area is limited to the area influenced by the sea factors (wind, tide, and sea water infiltration), while to the sea is limited to the area influenced by the land factors. Special concern need to be addressed in regarding to the use of coastal area. As part of the coastal area, littoral zone is very dynamics due to factors of oceanography and human activities. The same fact is experienced by the littoral zone in Sindulang Satu. Physical change has been the fact in this littoral zone.  In relation to the change, it is considered of importance to describe and analysis the characteristics of the sediment and related oceanography factors.  Result of observation indicated that sediment in the littoral zone consist of fine sand, medium sand, very fine sand, coarse sand and pebbles. Silt and boulder were also found. Distribution of sediment granulometry showed that the littoral zone was dominated by fine sand material, bad sorted, asymetrical to small size and symmetrical granulometry, and mesokurtic. Tidal current is the type of current working in the littoral zone and it plays importance role in the sediment.
Identification and Density of Bivalves on Coral Reef Flats in The Water of Mandolang and Malalayang, North Sulawesi Lolaro, Wildy; Ompi, Medy; Manembu, Indri; Djamaludin, Rignolda; Roeroe, Kakaskasen; Rimper, Joice
JURNAL PESISIR DAN LAUT TROPIS Vol. 14 No. 1 (2026): JURNAL PESISIR DAN LAUT TROPIS
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jplt.14.1.2026.66011

Abstract

The research problems addressed in this study were what species of bivalve and what densities each species of bivalves inhabit on the coral reef flats both  Mandolang and Malalayang, North Sulawesi. This study aimed to identify the species of bivalves and the species density of bivalves.  Data were collected using a belt transect method measuring 20 m in length and 1 m in width on both the left and right sides of the transect line at a depth of 3 m. Three belt transects as replicates were deployed at each site of coral reef.  All specimens of bivalves encountered were documented and identified, and species density values were subsequently calculated. The results revealed four bivalve species, namely Tridacna maxima, Tridacna crocea, Ruditapes philippinarum, and Barbatia barbata. T. crocea, T. maxima, and R. philippinarum were identified only in Mandolang, whereas R. philippinarum, B. barbata, and T. crocea were identified in Malalayang. Furthermore, R. philippinarum and T. crocea were found in both Mandolang and Malalayang. Bivalve density in Mandolang varied among species, with T. crocea at 2.67 ind/40 m² (0.07 ind/m²), T. maxima at 1.33 ind/40 m² (0.03 ind/m²), and R. philippinarum at 0.67 ind/40 m² (0.02 ind/m²). Similarly, in Malalayang waters, R. philippinarum showed the highest density at 10.33 ind/40 m² (0.26 ind/m²), while B. barbata and T. crocea exhibited the same average density of 1.33 ind/40 m² (0.03 ind/m²). Key words: Bivalves, Density, Coral reef, Mandolang, Malalayang   Abstrak Rumusan masalah dalam penelitian ini adalah apa saja jenis- jenis bivalva yang menempati habitat terumbu karang di Perairan Mandolang dan Malalayang, Sulawesi Utara, dan bagaimana kepadatan jenis-jenis bivalvia di perairan Mandolang dan Malalayang Sulawesi Utara. Penelitian ini bertujuan untuk mengidentifikasi jenis-jenis bivalva yang menempati substrat karang serta mengetahui kepada jenis-jenis bivalva yang menempati rataan karang di Mandolang dan Malalayang Sulawesi Utara. Metode pengambilan data menggunankan belt transect sepanjang 20m dengan lebar 1m ke kiri dan 1m ke kanan garis transek pada ke dalaman 3 meter. Tiga ‘belt transek’ sebagai ulangan telah digunakan dalam pengambilan sampel di setiap rataan karang ini.  Sampel yang ditemukan didokumentasikan dan diidentifikasi, kemudian nilai kepadatan jenis bivalvia dihitung.  Hasil penelitian terdapat empat jenis bivalvia, yaitu T. maxima, T. crocea, Ruditapes philippinarum, dan  Barbatia barbata.  T. crocea, T. maxima, Ruditapes philippinarum teridentifikasi hanya di Mandolang, sedangkan Ruditapes philippinarum, Barbatia barbata, T. crocea teridentifikasi hanya di Malayang.  Ruditapes philippinarum, dan T. crocea teridentifikasi baik di Mandolang dan Malalayang.  Kepadatan bivalvia pada perairan Mandolang bervariasi menurut jenis, yaitu T. crocea (2,67 ind/40m2) atau 0,07 ind./m2, T. maxima (1,33 ind/40m2) atau 0,03 ind./ m2, dan Ruditapes philippinarum 0,67 ind/40m2 atau 0,02ind./ m2), demikian pula dengan yang di Malalayang, yaitu: Ruditapes philippinarum dengan 10,33 ind/40m2, atau 0,26 ind./m2, selanjutnya masing jenis memiliki kepadatan rata-rata yang sama, yaitu Barbatia barbata dan T. crocea dengan 1,33 ind./40m2, atau 0,03 ind./ m2. Kata kunci: Bivalvia, Kepadatan, Terumbu karang, Mandolang, Malalayang
Co-Authors Esry T. Opa Indri Manembu Joice R.T.S.L Rimper Junet I. S. Korwa Lolaro, Wildy Medy Ompi Pelle, Wilmy Etwil Roeroe, Kakaskasen Andreas Sirajudin, Irfan