Judul: Analisis Kesetimbangan Air di Daerah Aliran Sungai Brantas, Jawa Timur
Abstrak: The principle of water balance is the relationship between total water inflow and water outflow that can occur in a watershed (DAS). The objectives of this study were to analyze the water balance based on capacity of ground water reservoir in the Brantas watershed and to solve deficit and surplus water problemes in the Brantas watershed. The result showed that groundwater storage in June until September was deficit because from June until September was the dry season periode. That is because the flow of water entering the soil layer will be the base flow (base flow), and the streams that will fill the river network system. The flow of water entering the river during the dry season in small quantities, so there is drought in the dry season. Efforts to do is to recharge wells made in order to increase the amount of water that entered and stored in the soil. Efforts to do is to recharge wells made in order to increase the amount of water that entered and stored in the soil.
Keyword: watershed, water balance, groundwater storage

Judul: Analisis Spasial Neraca Air Menggunakan Model Hidrologi SWAT dan Thornthwaite di Sub DAS Betara Kabupaten Tanjung Jabung Barat, Jambi
Abstrak: Neraca air (water balance) merupakan neraca masukan dan keluaran air disuatu tempat pada periode tertentu, sehingga dapat digunakan untuk mengetahui adanya kelebihan (surplus) ataupun kekurangan (defisit) air. Salah satu cara untuk mengetahui neraca air secara spasial adalah dengan menggunakan model hidrologi. Tujuan dari penelitian ini adalah mengetahui kondisi hidrologi pada Sub DAS Betara, menghitung besarnya simpanan air pada Sub DAS Betara, membandingkan hasil neraca air dengan menggunakan model SWAT dan Thornthwaite. Berdasarkan curah hujan rata-rata bulanan diketahui bahwa Sub DAS Betara memiliki rata-rata curah hujan sebesar 225.31 mm/bulan. Hasil pemodelan SWAT menghasilkan nilai evapotranspirasi potensial 122 mm/bulan, nilai evapotranspirasi aktual 80mm/bulan, total limpasan 91 mm/bulan dan hasil air 137 mm/bulan. Model Thornthwaite menghasilkan evapotranpirasi aktual dan potensial 110 mm/bulan, limpasan 114 mm/bulan dan surplus air sebesar 103 mm/bulan. Terdapat perbedaan hasil simulasi neraca air antara model SWAT dengan model Thornthwaite.
Keyword: curah hujan, evapotranspirasi, neraca air, SWAT, Thornthwaite

Judul: Prevalence of Bird Lice on Rock Pigeon (Columba livia) in 99Wonderland Park, Selangor, Malaysia
Abstrak: Rock Pigeon (Columba livia) have coexisted with humans for thousands of years and are used for various purposes such as food and in sports. Rock pigeons may have the potential to be infested with a wide range of ectoparasites, which can have a significant impact on their life cycle. This study aims to measure the prevalence of Columba livia with bird lice in 99Wonderland Park, Selangor, Malaysia in the year 2020 and to ascertain the impact of bird lice on the health of these infested birds. Data were collected from clinical records for the month of January to December in the year 2020 from 99Wonderland Park, Selangor, Malaysia. Lice were identified in 42 of the 80 Rock pigeons examined so, the overall prevalence of lice infestations was 52.5%. The prevalence of ectoparasites was found to be higher in young Rock pigeons (60.4%) as compared to adult Rock pigeons (37.4%). Columbicola columbae (wing lice) and Colpocephalum turbinatum (body lice) are two species of lice that have been detected. Body lice were more prevalent in young Columba livia birds at 47.6% whereas wing lice were more prevalent in adult Columba livia birds at 16.7%. Most of the lice were found in the thorax and abdomen area followed by the head and neck area., Merpati Batu (Columba livia) telah hidup berdampingan dengan manusia selama ribuan tahun dan digunakan untuk berbagai keperluan seperti makanan dan olahraga. Merpati batu dapat terinfestasi dengan berbagai ektoparasit, yang dapat berdampak signifikan pada siklus hidup mereka. Penelitian ini bertujuan untuk mengetahui prevalensi Columba livia dengan kutu burung di 99 Wonderland Park, Selangor, Malaysia pada tahun 2020 dan untuk memastikan dampaknya terhadap kesehatan burung yang terinfestasi. Data dikumpulkan dari catatan klinis dari bulan Januari hingga Desember tahun 2020 dari 99Wonderland Park, Selangor, Malaysia. Kutu diidentifikasi pada 42 dari 80 merpati batu yang diperiksa sehingga, prevalensi keseluruhan infestasi kutu adalah 52,5%. Prevalensi ektoparasit ditemukan lebih tinggi pada merpati batu muda (60,4%) dibandingkan dengan merpati batu dewasa (37,4%). Columbicola columbae (kutu sayap) dan Colpocephalum turbinatum (kutu badan) adalah dua spesies kutu yang telah ditemukan. Kutu badan lebih banyak ditemukan pada burung Columba livia muda sebesar 47,6% sedangkan kutu sayap lebih banyak ditemukan pada burung Columba livia dewasa sebesar 16,7%. Sebagian besar kutu ditemukan di daerah dada dan abdomen diikuti daerah kepala dan leher.
Keyword: Columba livia, prevalence, ectoparasite, wing lice, body lice, Columba livia, prevalensi, ektoparasit, kutu sayap, kutu badan