ABSTRAKKondisi kualitas air suatu perairan yang baik sangat penting untuk mendukung kelulushidupan organisme yang hidup di dalamnya. Penentuan status mutu air perlu dilakukan sebagai acuan dalam melakukan pemantauan pencemaran kualitas air. Penelitian ini bertujuan untuk mengkaji status mutu air dan menentukan indeks pencemaran berdasarkan parameter fisika-kimia di perairan Distrik Depapre, Kabupaten Jayapura. Pengambilan sampel kualitas air dilakukan pada bulan Oktober 2017 di lima stasiun penelitian, kemudian hasilnya dibandingkan dengan baku mutu air laut untuk biota laut berdasarkan KEPMEN-LH No. 51 Tahun 2004. Hasil penelitian menunjukkan bahwa parameter yang masih sesuai baku mutu antara lain suhu, salinitas, sulfida dan kecerahan perairan, sedangkan parameter yang telah melampaui baku mutu antara lain pH, ammonia total, nitrat dan fosfat. Berdasarkan hasil perhitungan indeks pencemaran menunjukkan bahwa perairan Distrik Depapre berada dalam kategori tercemar ringan hingga tercemar sedang. ABSTRACTGood water quality is extremely important to support life of organisms. The determination of water quality status was needed as reference to monitor water pollution. This study aimed to assess the status of water quality and determine pollution index based on physical-chemical parameters in the Depapre District waters, Jayapura Regency. Sampling was carried out in October 2017 across five research stations, then the results were compared with water quality standards based on KEPMEN-LH No. 51 Tahun 2004 for marine biotas. The results showed that the parameters in according to the quality standards are temperature, salinity, sulphide and water transparency, while those that have exceeded the quality standards are pH, total ammonia, nitrate and phosphate. Based on the calculation of pollution index indicates that the Depapre District waters was in light pollution to medium categories.

New Guinea singing dogs (NGSD) are identifiable by their namesake vocalizations, which are unlike any other canid population. Their novel behaviors and potential singular origin during dog domestication make them an attractive, but elusive, subject for evolutionary and conservation study. Although once plentiful on the island of New Guinea (NG), they were presumed to currently exist only in captivity. This conclusion was based on the lack of sightings in the lowlands of the island and the concurrent expansion of European- and Asian-derived dogs. We have analyzed the first nuclear genomes from a canid population discovered during a recent expedition to the highlands of NG. The extreme altitude (>4,000 m) of the highland wild dogs’ (HWD) observed range and confirmed vocalizations indicate their potential to be a wild NGSD population. Comparison of single-nucleotide polymorphism genotypes shows strong similarity between HWD and the homogeneous captive NGSD, with the HWD showing significantly higher genetic diversity. Admixture analyses and estimation of shared haplotypes with phylogenetically diverse populations also indicates the HWD is a novel population within the distinct evolutionary lineage of Oceanic canids. Taken together, these data indicate the HWD possesses a distinct potential to aid in the conservation of NGSD both in the wild and under human care.

The determination of water quality status was needed as a reference to monitor water pollution. The purpose of this study was to determine the concentration of ammonia, nitrate, and phosphate in Depapre waters, Jayapura Regency. Sampling was carried out in October 2017 across five research stations, then the results were compared with water quality standards based on KEPMEN-LH No. 51 Tahun 2004 for marine biotas. Based on the analysis of water quality in Depapre waters obtained the following results are the ammonia content ranges from 0.8 to 11.6 mg/L, the content of nitrate ranged from 0.009 to 0.54 mg/L, and the phosphate content ranged from 0.016 to 1.19 mg/L. These results indicate that the ammonia, nitrate and phosphate concentration in Depapre Waters have exceeded the water quality standard. The concentration of ammonia, nitrate, and phosphate is high enough and endanger the lives of marine biotas.

No abstract

In Indonesia, the river water quality has been determined based on Government Regulation of the Republic of Indonesia No. 22 of 2021. This study aimed to determine the quality of surface water from the Damsari, Jabawi, Kleblow, and Komba Rivers in Jayapura Regency based on the monitoring data from 2016 to 2019. The CCME-WQI method is used to determine the status of rivers based on river water quality standards (class 1 to class 4). The results of the study showed that the parameters of water temperature, TDS, pH, NH 3 , NO 3 -, SO 4 -2 , surfactant, oil/grease, Cr-(IV), Mn, Fe, Fecal Coliform, and Total Coliform were still in accordance with the quality standard. Meanwhile, TSS, COD, BOD, Total Phosphate, Hg, and Ni have exceeded the water quality standard, where the dominant pollutant source is an anthropogenic waste. On the basis of the WQI average value, the four rivers are not suitable as a source of drinking water ). The Jabawi River can be used as a recreational facility, but it must be under special management (Fair; 69.75), while the other three rivers are not suitable (Marginal; 52.00 -61.67). The Jabawi and Komba Rivers are in the Fair category (75.50 and 69.33) to support aquatic life, while the Damsari and Kleblow Rivers are in the Marginal category (59.00 and 61.25). The water quality of the four rivers is very good and suitable to be used as a water source for irrigation (Good category; 80.00 -88.00). The strategies for controlling river water pollution and increasing the role of the government, stakeholders, and the community are needed.