Judul: Allometry Analysis of Fiddler Crabs Uca forcipata and U. dussumieri (Crustacea: Decapoda) in the West of Tanjung Jabung Jambi
Abstrak: Kepiting biola jantan dewasa memiliki seksual dimorfisme yaitu salah satu capitnya tumbuh lebih cepat dari capit lainnya. Kondisi ini menunjukkan bentuk tubuh asimetri. Capit besar dapat berada pada bagian kanan (dekstral) atau bagian kiri (sinistral) tubuh. Capit besar dan capit kecil pada Uca memiliki fungsi yang berbeda. Capit besar berfungsi sebagai armamen, yaitu untuk bertarung dengan individu jantan lainnya dalam memperebutkan teritori dan individu betina; capit besar juga berfungsi sebagai ornamen, yaitu untuk menarik perhatian individu betina. Capit kecil baik pada individu jantan maupun individu betina berfungsi sebagai alat makan. Studi mengenai asimetri dilakukan di Tanjung Jabung Barat Jambi, Indonesia dari Agustus 2014 sampai Februari 2015. Jumlah sampel (individu) yang digunakan dalam penelitian ini adalah 153. Terdiri dari dua spesies, yaitu 89 individu Uca forcipata dan 64 individu U. dussumieri. Frekuensi handedness (posisi capit yang lebih besar) dari masing-masing spesies pada masing-masing stasiun seimbang antara right-handed dan left-handed (p-value 0.05; chi-square test). Analisis alometri dilakukan untuk melihat kovariasi dari kedua capit, relatif terhadap perbedaan ukuran tubuh menggunakan analisis bivariat. Lebar karapas (CRW) digunakan sebagai estimasi ukuran tubuh karena paralel dengan hipotesis alometri positif dari pertumbuhan capit besar. Panjang karapas (CRL) menunjukkan pola pertumbuhan alometri negatif terhadap CRW. Capit besar menunjukkan pola pertumbuhan alometri positif dan capit kecil menunjukkan pola pertumbuhan isometri untuk kedua spesies. Pertumbuhan yang tidak seimbang pada kedua capit mengarahkan pada bentuk tubuh asimetri.
Keyword: Antisimetri, Dimorfisme seksual, Pola pertumbuhan, Uca

Judul: Karateristik Habitat dan Beberapa Aspek Reproduksi Kepiting Kelapa (Birgus latro) di Pulau Uta, Propinsi Maluku Utara
Abstrak: Coconut crab (B. latro) is one of crustacea species which has high economic value, but it is considered rare and classified into vulnerable category by the International Union for Conservation of Nature (IUCN). In Indonesia, the status of this animal population has been not exactly identified, but it has tended to decline because of local people consumption and its habitat quality degradation. Regarding importance of the species resources, thus undestanding its biology and ecology aspects can be applied as the proper management stock and effort of preservation. The research was done in Uta Island on May, July and September with the purpose to analyze the habitat characteristic and gonadal maturation of Coconut Crab on that island. The sampling was taken by kuadran method. The parameter which was analized to understand the habitat. Characteristic and its reproduction aspects such as physical – chemical characteristic of soil, gonadal maturation and plant vegetation analysis. The habitat characteristic was analyzed by using cluster analysis. The result analysis showed that the relation of Length – Weight of male crab is W = 1,93 (CP + r)1,17, while the female is W = 1,97 (CP + r)0,97. Each of those sexual species has allometric growth characteristics. The observation showed that the male did not found in TKG I condition but the female can be found on May (30%) and September (25%) of catch. TKG II was mostly found on male which catched on May in South Station (65%), TKG III was mostly found on female which catched on September in West Station (25%) of catched individu. TKG IV (100%) both male and female where mostly found on July. The different of gonadal maturation levels in all catching times showed that gonadal maturation occured different time for broodstock. The smallest crab which is having gonad maturation was found in length of (CP + r) 66,44 mm. The biggest condition factors of male was found on July and decrease on September, while the highest condition factor of female was found on May that decrease on July, but increase again on September. Generally, sex ratio of male and female is 1 : 1 (avoid deviation). The distribution index showed homogen but tend to have random distribution. There is no different on catch both the amount on level of gonadal maturation. Eventhough, there are different habitat characteristic in every station doesn‟t affect to the catch, both the quantity and level of gonad maturity. The habitat condition in all station for coconut crab to support the sustainability of its activities.
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Judul: Quality improvement of paddy soil and discharged water in drainage channel at acid sulphate soil.
Abstrak: Oxidation of pyrite in acid sulphate soil reduced the quality of soil and discharged water from paddy field. Improvement of soil quality in paddy cultivation could be managed by addition of organic matter together with regulating water to maintain its reductive condition. Water quality improvement in the paddy field was conducted by addition of good quality water (pH=5,0)through utilization of high tide water in dry season and rain water during rainy season while for improvement of discharged water, a system of drainage channel was developed
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