Judul: Interaksi Dua Spesies Invasif Cherax quadricarinatus (von Martens, 1868) dan Procambarus clarkii (Girard, 1852) dalam Ruang Perairan
Abstrak: Masuknya spesies invasif ke dalam suatu perairan menyebabkan terganggunya komunitas asli dan mengubah struktur perairan. Penelitian ini bertujuan mendeteksi bentuk interaksi antara dua spesies lobster air tawar asing invasif C. quadricarinatus dan P. clarkii yang hidup pada suatu ruang berdasarkan ukuran spesies. Penelitian menggunakan 4 perlakuan dan 3 kali ulangan. Analisis dilakukan secara deskriptif bagi data-data interaksi, data biota yang mati untuk menentukan kelangsungan hidup, dan data bobot awal dan akhir biota untuk menentukan bobot mutlak. Dalam hal pemanfaatan pakan, P. clarkii lebih terlihat jelas pergerakaan (tubuh dan mulut) dibandingkan C. quadricarinatus. Interaksi mempertahankan wilayah territorial terjadi antara C. quadricarinatus dan P. clarkii bahkan spesies sejenis. Interaksi-interaksi yang terjadi antara C. quadricarinatus dan P. clarkii menyebabkan kecacatan, kematian, dan penurunan kelangsungan hidup pada pada kedua spesies. Kelangsungan hidup dan bobot mutlak pada beberapa perlakuan dan ulangan cenderung mengalami penurunan, namun terdapat juga kenaikan pada beberapa perlakuan dan ulangan, The entry of invasive species into a body of water disrupts native communities and changes the structure of the waters. This study aimed to detect the form of interaction between two invasive foreign crayfish species C. quadricarinatus and P. clarkii that live in a space based on species size. The study used 4 treatments and 3 repeats. Analysis was carried out descriptively for interaction data, dead biota data to determine survival, and biota beginning and end weight data to determine absolute weight. In terms of feed utilization, P. clarkii is more clearly visible movements of the body and mouth compared to C. quadricarinatus. The interaction of maintaining territorial territories occurs between C. quadricarinatus and P. clarkii even similar species. The interactions that occurred between C. quadricarinatus and P. clarkii led to disability, mortality, and decreased survival in both species. Survival and absolute weight in some treatments and replays tend to decrease, but there is also an increase in some treatments and replays.
Keyword: Cherax quadricarinatus, Invasive, Procambarus clarkii, Species

Judul: Abundance, Habitat Characteristics and Management Strategy of Invasive Species Cherax quadricarinatus in Lido Lake Bogor
Abstrak: Indonesia adalah negara mega keanekaragaman hayati di dunia termasuk diantaranya adalah spesies air asli. Beberapa spesies asing bisa menjadi masalah bagi keanekaragaman hayati perairan. Lobster karang atau lobster Redclaw, Cherax quadricarinatus, berasal dari habitat air tawar Australia. Sayangnya, C. quadricarinatus juga diidentifikasi sebagai spesies invasif, setelah memiliki populasi liar di beberapa danau di Indonesia. Penelitian ini dilakukan untuk mengestimasi kelimpahan, mengetahui hubungan karakteristik fisika kimia habitat dan merumuskan strategi pengelolaan berkelanjutan C. quadricarinatus sebagai spesies asing invasif di Danau Lido, Indonesia. Pengambilan data dilakukan pada bulan Oktober 2018, Februari 2019 dan Oktober 2019 di Danau Lido, Bogor, Jawa Barat. Sekitar kurang lebih empat puluh dua perangkap dipasang di sepanjang tepi danau. Metode Schnabel mark-recapture digunakan dalam menghitung estimasi kelimpahan populasi. Hasil penelitian menunjukkan bahwa kelimpahan C. quadricarinatus di Danau Lido pada Oktober 2018 adalah sebesar 2 285 ± 134 individu dan Februari 2019 sebesar 2 595 ± 159 individu. Terdapat perbedaan rasio jenis kelamin antara September 2018 dan Februari 2019 dan berdasarkan uji chi-square menunjukkan bahwa dalam dua periode data sampel ditemukan bahwa nisbah kelamin tidak 1:1 pada tingkat kepercayaan 95%. Kondisi kualitas air di danau Lido secara umum mendukung pertumbuhan dan perkembangan C. quadricarinatus. Berdasarkan hasil analisis PCA, parameter yang berpengaruh terhadap keberadaan lobster adalah suhu, DO, pH, kecerahan dan kedalaman. Strategi pengelolaan spesies asing invasif (SAI) C. quadricarinatus di Danaul Lido berdasarkan hasil analisis ANP BOCR adalah Pemanfaatan dengan monitoring dan kontrol SAI. Alternatif ini merupakan kondisi realistic atau yang paling mungkin dilakukan saat ini untuk pengelolaan SAI yang berkelanjutan di Danau Lido. Akan tetapi alternatif inip erlu didukung dengan program pengelolaan jangka panjang yang perlu diatur dalam peraturan kebijakan pemerintah., Indonesia is a mega country of biodiversity in the world including native water species. Some alien species can be a problem for aquatic biodiversity. Redclaw lobster, Cherax quadricarinatus, comes from Australian freshwater habitat. Unfortunately, C. quadricarinatus is also recognized as an invasive species, after having wild populations in several lakes in Indonesia. This research was conducted to estimate abundance, find out the relationship between physical and chemical characteristics of habitats and formulate sustainable management strategies of C. quadricarinatus as an invasive alien species in Lido Lake, Indonesia. Data was collected in October 2018, February 2019 and October 2019 in Lake Lido, Bogor, West Java. Around forty two traps were set along the lake's line. The Schnabel mark-recapture method is used in calculating population abundance estimates. The results showed that the abundance of C. quadricarinatus at Lido Lake in October 2018 and February 2019 was 2 285 ± 134 and 2 595 ± 159 individuals respectively. There was a slight difference in the sex ratio of C. quadricarinatus between September 2018 and February 2019 but based on the chi-square test showed that in the two periods the sample data was found to be not 1:1 at the 95% confidence level. Water quality conditions in Lido Lake generally support the growth and development of C. quadricarinatus. Based on the results of the PCA analysis, the parameters that influence the presence of lobsters are temperature, DO, pH, transparency and depth. The strategy
Keyword: Cherax quadricarinatus, mark-recapture, spesies invasif, strategi pengelolaan, analytical network process

Judul: Pembuatan Sel Surya Berbasis Film Ferroelektrik Barium Strontium Titanate (Ba0,5Sr0,5TiO3)
Abstrak: Growth of films Ba0,5Sr0,5TiO3 (BST) 1 M has been done with variation of annealing in hold time 8 hours, 15 hours, 22 hours, and 29 hours at constant temperature 8500C, above Si (100) substrate p-type, by using the sol-gel process method which followed with spin coating process at 3000 rpm for 30 seconds. Optics spectroscopy shows that BST film solar cells with annealing hold time 8 hours, 15 hours, and 22 hours, works effectively in wavelength ≥ 700 nm absorption range. Yet for sample with annealing hold time about 29 hours effectively absorb in ≤ 700 nm wavelength range. It obtained BST film refractive index at range 2.0 to 7.0 to wavelength range ±370-870 nm. Band gap BST film value based on annealing hold time 8 hours, 15 hours, 22 hours, and 29 hours respectively 2.60 eV; 3.12 eV: 3.24 eV, and 2.66 eV. Electrical conductivity value which obtained, indicate that the BST film is classified as semiconductor material with conductivity order 10-5-10-4 S / cm. The result of I-V photovoltaic characterization shows the BST film potentially to be a solar cells device with efficiency according to the annealing hold time 8 hours, 15 hours, 22 hours, and 29 hours in a row are 2.68x10-5%, 3.51x10-5%, 4.53x10-5% and 3.22x10-5%
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