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Phosphorous fractionation distribution in surface sediments of the Jobokuto Bay Lilik Maslukah; Anindya Wirasatriya; Muh Yusuf; Resy Sekar Sari; Ummu Salma; Muhammad Zainuri
Molekul Vol 16, No 2 (2021)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (299.164 KB) | DOI: 10.20884/1.jm.2021.16.2.572

Abstract

Phosphorus (P) is an essential nutrient that can limit primary productivity in waters. Phosphorus has significant impact on the biogeochemical cycle in marine ecosystems. Surface sediments play an important role in the nutrient dynamics. Riverine input is sources of P to the ocean and sediment plays an important role as a source or sink of P in the coloumn of water. Phosphorous (P) availability is regarded as the most important factor for determining the water quality in coastal waters. However, not all of the P fractions can be released from the sediment. This study was conducted to identify the distribution of phosphorus (P) fractionation in the sediment surface of Jobokuto Bay. Samples were collected from ten locations. Percentage of sedimentary parameters such as sand, silt, clay, and organic carbon were analyzed to find out their relation with various P fractions. The sediment found was mostly sand at the station near to the coast and mud (silt and clay) at offshore stations. The results showed that Ca-P dominant (56.03%) and percentages of Fe-P, OP, and Ads-P were  23.43, 17.41, and 3.2% respectively. Terrestrial inputs and biological deposits cause Ca-P dominant. The bioavailability of P fractions were ranged from 34.45 to 56.1% of the total P (TP) content. The high concentrations of the Ads-P was found in the mud fraction and located at offshore stations. The order of abundance of the major forms of P in the surface sediments of Jobokuto bay is as follows: Ca-P > Fe-P > OP > Ads-P
Morphometric and genetic identification of Mackerel (Rastrelliger sp.) collected from Muara Baru Fish Market, Jakarta Ummu Salma; Hawis Madduppa
Jurnal Ilmu Kelautan Kepulauan Vol 4, No 2 (2021): Jurnal Ilmu Kelautan Kepulauan
Publisher : Fakultas Perikanan dan Kelautan. Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/jikk.v4i2.3880

Abstract

Ecosystems in Indonesia have a lot of potential resources, and one of them is seafood resources. Mackerel is potential catches of fish in the Jakarta Bay (as part of Java Sea area) that has high economic value. The Java Sea has only two mackerel species, Rastrelliger brachysoma and R. kanagurta which have similar morphology. Therefore in this study was conducted to compare morphometric and molecular analysis (DNA barcoding) using COI sequences so that specific species from specimens could be identified. The analyzed fish samples have striking characteristics such as blackline on the back, a black line near the pectoral fins, and a dark body part is extending above the rib line. The dorsal fins have a yellowish-gray color, yellowish pectoral, and pectoral fins.The result showed that measurements characteristic features of mackerels in Muara Angke belonging to Rastrelliger genera. DNA Barcoding analysis showed that the collected sample identified as Rastrelliger kanagurta with 99.25% identification similarity. The DNA code can distinguish between all fish species and identify the eggs, larvae, and carcass pieces of this species. So that fish in fish landings can be identified and tagged according to their species. This study has successfully identified a sample from Muara Angke by using a DNA code and therefore would be beneficial for managing food controlling and food safety concerns. Keywords: molecular identification, DNA barcoding, Rastrelliger kanagurta, morphological analysis 
Mangrove Habitat Structure of Mud Crabs (Scylla serrata and S. olivacea) in the Bee Jay Bakau Resort Probolinggo, Indonesia Audina Putri; Dietriech Geoffrey Bengen; Neviaty Putri Zamani; Ummu Salma; Novian Prahandhy Kusuma; Nanda Tiara Diningsih; Sonja Kleinertz
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 27, No 2 (2022): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.27.2.124-132

Abstract

Mud crabs (Scylla serrata and S. olivacea) are important fisheries resources, but their population in nature is decreasing due to anthropogenic activities, like the deforestation of mangrove forests. Hence, it is crucial to conserve this marine biota for future sustainable use and to conserve our marine biodiversity. Conducting studies on the biological interactions of mud crabs in mangrove habitats can be one of the future conservation approaches. Accordingly, an analysis of the functional relationships between Scylla spp. abundance and the respective mangrove habitat have to be carried out. The research was conducted in the mangrove ecosystem of Bee Jay Bakau Resort Probolinggo (BJBR). Data were collected using line transects and quadrant transects. The Associations between mangroves and mud crab habitat structures were analyzed using the Correspondence Analysis (CA) method. The results show that the relationship matrix between Scylla spp. and the structure of the mangrove habitat is centered on the F1 and F2 factorial axes (89.22%). S. serrata of all size classes were associated with dense mangroves (≥15 trees per 100m2) and high salinities (3-4 ppt), while S. olivacea has shown to be associated with rare to very dense mangrove systems. It indicates that S. olivacea tends to have a higher adaptation rate than S. serrata in this mangrove system. This study will provide information and recommendation for the conservation management of mud crabs and mangrove ecosystems to conserve marine biodiversity.