Water conditions can determine the life form of coral. This study aimed to determine life form of coral growth in different environmental conditions around Lampung Bay waters. The observation using quadratic transect with size (1x1) m 2 and processing data by using CPCE (Coral Point Count with Excel Extension) software. This study was conducted in July 2013. The results showed that the dominant form of coral growth in Lampung Bay waters was branching form of the Acropora genus (ACB), foliose (CF) and massive (CM) forms. Branching types were found in areas with weak current conditions and high brightness levels. Coral foliose were found in areas where the current was also weak and low turbidity. Coral massive domination was found in high level both in current and turbidity. It was concluded that environmental conditions could influence the life form of coral reef in the waters of Lampung Bay.
Microplastics (MPs) and heavy metals are two major types of pollutants that interact with each other, but they are poorly understood. Polystyrene (PS) is one type of MPs that is often detected in aquatic environments. In this study, we examined the adsorption capacity and release rate of heavy metals with respect to different particle sizes of PS, heavy metals, initial heavy metal concentrations, and salinities. Virgin (new) PS with diameters of 20, 50, 130, and 250 μm was used in this study, and four heavy metals (lead, cadmium, copper, and zinc) were used. The results showed that larger PS particle sizes adsorbed more heavy metals even though it took longer to achieve equilibrium adsorption. An increase in heavy metal concentration caused the adsorption capacity (μg g–1) of PS particles to also increase, but the adsorption rate (%) decreased. Increased salinity of the heavy metal solution resulted in a slower adsorption time and a lower adsorption capacity and release rate from the surface of PS particles. Different heavy metals also had different adsorption capacities. Pb was consistently more highly adsorbed by MPs, followed by Cu, Zn, and Cd. Larger PS sizes released heavy metals faster than smaller PS sizes, and the amounts of heavy metals released were higher. The heavy metal with the highest release rate was Cd, followed by Pb, Cu, and Zn. Finally, our findings highlight the interactions between PS and heavy metals and strongly support that PS particles can act as vectors for heavy metals in aquatic systems.
The quality of water was seen from the macrozoobenthos community analysis that lives in it. The purpose of this research is to know the relation N-total and C-organic in sediment with macrozoobenthos in Payung Island of Banyuasin Regency. This research uses purposive sampling method. Sampling and macrozoobenthic samples using Ekman grab. The types of macrozoobenthos found to consist of Bivalvia class (Nassarius distortus, Abra Soyae), Gastropoda (Septaria linatea, Epitonium pallasi), Polychaeta (Nereis sp) and Oligochaeta (Lumbriculus sp). The dominant macrozoobenthos composition is Nereis sp. The C-organic content in the waters sediments of Payung Island ranged from 10.52 to 17.92% (moderate to high criteria) and N-total ranged from 0.61 to 1.14% (high and very high criteria), C/N ratio ranged from 10 to 29. This indicates that sediment of Payung Island had undergone balance mineralization process and immobilization. The results of linear regression analysis show that C-organic and N-total have a positive relationship with the abundance of macrozoobenthos Kualitas suatu perairan dapat dilihat dari analisa komunitas makrozoobentos yang hidup di dalamnya. Tujuan penelitian ini adalah mengetahui hubungan antara kandungan N-total dan C-organik sedimen dengan makrozoobentos di Perairan Pulau Payung. Metodologi penelitian meliputi; pengambilan data parameter fisika kimia (suhu, salinitas, pH, dan DO). Pengambilan sampel sedimen dan makrozoobentos menggunakan ekman grab. Hasil dari penelitian ini, Jenis makrozoobentos yang ditemukan terdiri atas kelas Bivalvia (Nassarius distortus, Abra Soyae), Gastropoda (Septaria linatea, Epitonium pallasi), Polychaeta (Nereis sp) dan Oligochaeta (Lumbriculus sp). Komposisi makrozoobentos yang mendominasi yakni Nereis sp. Kandungan C-organik di sedimen perairan Pulau Payung berkisar 10,52-17,92% (kriteria sedang sampai tinggi) untuk N-total berkisar antara 0,61-1,14% (kategori tinggi dan sangat tinggi), sedangkan C/N rasio berkisar antara 10-29. Hal ini menunjukkan sedimen Pulau Payung telah mengalami proses mineralisasi dan imobilisasi seimbang. Hasil analisis regresi linear menunjukkan C-organik dan N-total memiliki hubungan yang positif dengan kelimpahan makrozoobenthos.
Nitrat dan fosfat merupakan nutrien yang dibutuhkan serta memiliki pengaruh terhadap pertumbuhan dan perkembangan hidup organisme di perairan. Apabila kedua unsur ini mengalami jumlah berlebih akan menjadi pencemar yang dapat menurunkan kualitas perairan. Penelitian ini bertujuan untuk mengetahui kandungan nitrat dan fosfat serta mengkaji konsentrasi nitrat dan fosfat pada sedimen berdasarkan klasifikasi kesuburan perairan di Muara Sungai Banyuasin. Penelitian ini telah dilaksanakan pada bulan Oktober - Desember 2018. Hasil penelitian menunjukkan bahwa konsentrasi nitrat pada sedimen di Muara Sungai Banyuasin berkisar antara 0,56 - 4,28 mg/kg dan konsentrasi fosfat berkisar antara 13,80 - 32,19 mg/kg. Berdasarkan kandungan nitrat pada sedimen, Muara Sungai Banyuasin termasuk dalam kategori kurang subur sedangkan berdasarkan kandungan fosfat pada sedimen, Muara Sungai Banyuasin dikategorikan dalam kesuburan yang tinggi.
Sedimentasi dapat menghambat pertumbuhan terumbu karang bahkan dapat menyebabkan kematian. Penelitian ini telah dilakukan di perairan Teluk Lampung. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh sedimentasi terhadap terumbu karang di perairan Teluk Lampung. Sepuluh stasiun dipilih untuk pengamatan dan pengukuran. Pengukuran laju sedimentasi menggunakan alat sediment traps yang dipasang di stasiun pengamatan terumbu karang selama 20 hari. Pengamatan kondisi terumbu karang menggunakan metode transek kuadrat berukuran 1 x 1 m2. Korelasi antara sedimentasi dengan terumbu karang dilakukan dengan metode analisis regresi. Hasil penelitian menunjukkan laju sedimentasi di stasiun pengamatan berkisar antara 3,09-44,29 mg cm-2 day-1. Dampak yang timbul termasuk dalam kategori kecil-sedang dan sedang-berat. Kondisi terumbu karang di perairan Teluk Lampung masuk dalam kategori rusak hingga baik. Persentase tutupan karang di stasiun pengamatan berkisar antara 8,75-60,85%. Hasil analisis regresi menunjukkan bahwa proses sedimentasi memiliki pengaruh negatif terhadap kehidupan terumbu karang di Teluk Lampung.
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