Gulma pada Lahan Kacang Tanah (Arachis hypogaea L.) di Kampung Meyeruk Papua Barat

Meyeruk village peanuts (Arachis hypogaea) were planted without a particular cropping pattern. This condition triggers Weed Diversity which can interfere with the growth of peanuts. This study aims to inventory the types of peanut weeds in two different land conditions in Meyeruk Village. The method used is descriptive method with direct observation technique. Weeds are carried out on flat and sloping land by making a combination of plotted paths. For each type of land, three observation plots were made, each plot measuring 2 m x 2 m with a distance of 3 m between the plots. The results obtained 14 Species of weeds, 5 species of weeds on flat land and 11 species of weeds on slopes. The type of weed that dominates and has the second largest number of individuals in the land type is Cynodon dactylon. The species with the highest importance index on flat land and slopes was Cynodon dactylon, with 120.83% and 59.53%, respectively.     &nbsp

Komunitas Gastropoda pada Padang Lamun Perairan Pantai Manokwari

This study was purposed to identify the spesies and the community structure of gastropods in Manokwari shore. The sampling used transect method at two observation stations, i.e Briosi BLK shore and Rendani shore. Each station has three transect lines parallel to the sea, each of which had 10 quadrats. These transects were placed on a seagrass beds. Data analysis was carried out including diversity index (H’), evenness index (E), dominance (D) and density of gastropods. The results showed that the water quality at both sampling locations could support the growth of gastropods. The species composition of the gastropods in two sampling locations consisted of 20 families, 28 genera, and 82 species. The diversity index (H’) in Briosi BLK shore was 3.14; evenness index (E) = 0,92; dominance (D) = 0,06 and density of gastropods 23,70 ind.m-2.  The diversity index (H’) of gastropods in Rendani shore was 3,79 ; equitability index (E) = 0,90; dominance (D) = 0,03 and density of gastropods 83,33 ind.m-2 . Gastropods found were Strombus (Canarium) urceus urceus, Conus (Virroconus) coronatus, Chicoreus sp.2, Vexillum (Costellaria) mirabile, Polinices tumidus, and Imbricaria conularis. Based on the diversity index, the two stations are in a high diversity index so that there is no dominant species in the two locations, The gastropod density in Rendani shore was higher than that in Briosi BLK, it is suspected that the substrate is suitable and the amount of organic matter and then, far from the gathering place to support the growth of gastropods.Penelitian ini bertujuan mengidentifikasi dan menganalisa struktur komunitas gastropoda di pesisir pantai Manokwari. Pengambilan sampel menggunakan metode transek di dua stasiun pengamatan yaitu Pantai Briosi BLK dan Pantai Rendani.  Setiap stasiun diletakkan tiga garis transek ke arah laut dan setiap transek terdiri atas 10 kuadrat. Transek ini diletakkan di atas padang lamun. Analisis data dilakukan meliputi indeks keanekaragaman, indeks keseragaman, dominasi dan kepadatan gastropoda. Hasil penelitian menunjukkan ditemukan bahwa kualitas perairan di kedua lokasi sampling dapat mendukung pertumbuhan gastropoda. Komposisi spesies gastropoda yang ditemukan pada kedua lokasi sampling meliputi 20 famili, 28 genera dan 82 spesies. Data Indeks keanekaragaman (H’) gastropoda yang ada di Pantai Briosi BLK nilainya 3,14; untuk indeks keseragaman nilainya 0,92; sedangkan dominansi nilainya 0,06 dan kepadatan berkisar 23,70 ind.m-2. Nilai Indeks keanekaragaman (H’) Gastropoda di Pantai Rendani 3,79; sedangkan nilai indeks keseragaman 0,90; untuk nilai dominansi 0,03 dan kepadatannya yaitu 83,33 ind.m‑2 . Gastropoda yang banyak ditemukan di kedua pantai ini adalah Strombus (Canarium) urceus urceus, Conus (Virroconus) coronatus, Chicoreus sp.2 , Vexillum (Costellaria) mirabile, Polinices tumidus, dan Imbricaria conularis. Berdasarkan indeks keanekaragaman, kedua stasiun tersebut berada dalam indeks keanekaragam tinggi sehingga tidak ada spesies yang dominan pada kedua lokasi tersebut. Kepadatan gastropoda pada lokasi Pantai Rendani lebih tinggi dari Pantai Briosi BLK hal ini diduga substrat yang cocok untuk tumbuh kembangnya gastropoda dan juga banyaknya bahan organik serta jauh dari pemukiman

PERTUMBUHAN, UMUR, DAN DIMORFISME SEKSUAL IKAN PELANGI ARFAK, Melanotaenia arfakensis Allen, 1990 DI SISTEM SUNGAI PRAFI, MANOKWARI, PAPUA BARAT

ABSTRACTArfak rainbow fish, Melanotaenia arfakensis is an endemic fish on several river systems in the northeastern part of the Vogelkop peninsula. This study aims to describe the growth, age at first maturity, and sexual dimorphism of this endemic fish on the Nimbai Stream and the Aimasi Stream, the Prafi River system. The fish were caught using handnet, then were measured their standard length and individual weight. Data were analyzed to estimated growth patterns, von Bertalanffy's growth rate, age at first maturity and sexual dimorphism characteristics. The results showed that male growth patterns varied, with a tendency of the increase in body length faster than that of body weight (negative allometric patterns) with b values ranging from 2.886 to 3.132. On the other hand, the female individuals had positive allometric patterns (b values ranged from 3.062 to 3.378). The growth rate (K) of male body length was faster (0.165-0.174) than that of female individuals (0.159-0.163). Male individuals reached the first maturity condition earlier (at age of 1.83-2.18 years) than female individuals (at age of 2.49-2.64 years). Sexual characteristics between the sexes are related to body height starting to appear when fish are of a standard length of larger than 18.22 mm or when male fish begin to approach the time of the first sexual maturity. Understanding of growth, age, and the characteristics of the sexual dimorphism of endemic fish has an important meaning in monitoring population conditions and for conservation efforts in their natural habitat

Struktur Vegetasi Riparia dan Implikasinya Terhadap Kondisi Habitat Ikan Pelangi Arfak, Melanotaenia Arfakensis di Sungai Nimbai, Manokwari Papua Barat

Riparian vegetation has an important role in maintaining water stability, one of which is the river. This study aims to describe the structure of riparian vegetation so that its implications can be seen for the conditions of rainbow arfak habitat on the Nimbai River. The study was conducted in three forest types, namely primary riparia forest, secondary riparia forest and open riparia forest. Sample collection of riparian vegetation was carried out by purposive sampling using sample plots. Plots measuring 2 m x 2 m are used to sample seedling and understorey growth, plots measuring 5 m x 5 m for growth at the stake level, while plots measuring 10 m x 10 m and 20 m x 20 m, for growth of pole and tree levels respectively. The identification results obtained a total of 35 species of understorey and 51 tree-level plants in all three types of riparian forests. Based on the analysis of vegetation structure, it is known that the condition of primary riparia forest and secondary riparian forest still relatively supports the life of arfak rainbow fish compared to open riparian forest. Higher tree level density associated with canopy cover which has implications for the temperature of the water to be colder and less fluctuating, input larger litter into the food chain in the river, and hold suspended particles into the river. Also, the function of riparian vegetation in spawning activities, substrate attaching eggs and nursery habitat for arfak rainbow fish larvae. The results of this study indicate the importance of riparian vegetation structure on the condition of rainbow arfak fish habitat. An understanding of the structure of vegetation is also a basic information for efforts to rehabilitate this endemic fish habitat to maintain the existence of a natural population.Vegetasi riparia memunyai peran penting dalam menjaga kestabilan perairan, salah satunya adalah sungai. Penelitian ini bertujuan untuk mendeskripsikan struktur vegetasi riparia sehingga dapat diketahui implikasinya terhadap kondisi habitat ikan pelangi arfak di Sungai Nimbai. Penelitian dilakukan pada tiga tipe hutan, yaitu hutan riparia primer, hutan riparia sekunder dan hutan riparia terbuka. Pengumpulan contoh vegetasi riparia dilakukan secara purposif sampling menggunakan petak contoh. Petak berukuran 2 m x 2 m digunakan untuk mencuplik pertumbuhan tingkat semai dan tumbuhan bawah, petak ukuran  5 m x 5 m untuk pertumbuhan tingkat pancang, sedangkan petak ukuran 10 m x 10 m dan 20 m x 20 m, masing-masing untuk pertumbuhan tingkat tiang dan pohon. Hasil identifikasi diperoleh total 35 jenis tumbuhan bawah dan 51 tumbuhan tingkat pohon di ketiga tipe hutan riparia. Berdasarkan hasil analisis struktur vegetasi diketahui bahwa kondisi hutan riparia primer dan hutan riparia sekunder masih relatif mendukung kehidupan ikan pelangi arfak dibandingkan hutan riparia terbuka. Kerapatan tingkat pohon yang lebih tinggi berkaitan dengan tutupan tajuk yang berimplikasi terhadap suhu air menjadi lebih dingin dan kurang berfluktuasi, masukan serasah lebih besar ke rantai makanan di sungai, dan menyanggah partikel tersuspensi masuk ke sungai. Juga fungsi vegetasi riparia dalam aktivitas pemijahan, substrat penempelan telur dan habitat pembesaran larva ikan pelangi arfak. Hasil penelitian ini menunjukkan arti penting struktur vegetasi riparia terhadap kondisi habitat ikan pelangi arfak. Pemahaman mengenai struktur vegetasi juga menjadi informasi dasar bagi upaya rehabilitasi habitat ikan endemik ini untuk mempertahankan keberadaan populasinya alami

Hubungan Motivasi Belajar dengan Hasil Belajar Biologi Siswa Di SMP 21 Rendani Manokwari

Penelitian ini bertujuan untuk mengetahui hubungan antara motivasi belajar dengan hasil belajar siswa pada mata pelajaran biologi di Kelas VII SMP Negeri 21 Rendani Kabupaten Manokwari. Metode dalam penelitian ini adalah ex post facto. Sampel dalam penelitian adalah seluruh siswa Kelas VII SMP Negeri 21 Rendani yang berjumlah 70 orang, dengan jumlah laki-laki 26 siswa dan perempuan 44 siswa. Data diperoleh melalui angket motivasi belajar dan dokumentasi hasil belajar. Uji validitas angket menggunakan korelasi product moment dan uji reliabilitas menggunakan rumus alpha. Analisis data menggunakan analisis regresi sederhana. Hasil penelitian menunjukkan bahwa motivasi belajar mempunyai hubungan dengan hasil belajar biologi siswa dan kontribusi motivasi belajar terhadap hasil belajar sebesar 25,9 %

HUBUNGAN MOTIVASI BELAJAR DENGAN HASIL BELAJAR BIOLOGI SISWA DI SMP 21 RENDANI MANOKWARI

Penelitian ini bertujuan untuk mengetahui hubungan antara motivasi belajar dengan hasil belajar siswa pada mata pelajaran biologi di Kelas VII SMP Negeri 21 Rendani Kabupaten Manokwari. Metode dalam penelitian ini adalah ex post facto. Sampel dalam penelitian adalah seluruh siswa Kelas VII SMP Negeri 21 Rendani yang berjumlah 70 orang, dengan jumlah laki-laki 26 siswa dan perempuan 44 siswa. Data diperoleh melalui angket motivasi belajar dan dokumentasi hasil belajar. Uji validitas angket menggunakan korelasi product moment dan uji reliabilitas menggunakan rumus alpha. Analisis data menggunakan analisis regresi sederhana. Hasil penelitian menunjukkan bahwa motivasi belajar mempunyai hubungan dengan hasil belajar biologi siswa dan kontribusi motivasi belajar terhadap hasil belajar sebesar 25,9 %.Kata kunci : motivasi belajar, hasil belaja