Judul: Kajian Komunitas Lamun di Perairan Pesisir Manokwari
Abstrak: Study of seagrass community in coastal water of Manokwari was done in July-October 2007. The location (sampling points) consisted of seagrass beds that were closed to anthropogenic waste and/or suspended particles sources (i.e. Andai, Wosi, and Briosi) and seagrass beds that were relatively far from those sources (i.e. Rendani and Tj. Mangewa). Seagrass samplings were conducted by line transect and plot methods, environmental parameters were measured. There were eight species collected which included in proineer group (C. rotundata, H. pinifolia, H. uninervis, H. ovalis, S. isoetifolium) and climax group (C. serrulata, E. acoroides, T. hemprichii).
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Judul: Kajian komunitas padang lamun sebagai fungsi habitat ikan di perairan Manokwari Papua Barat
Abstrak: Secara ekologis ekosistem padang lamun di perairan pesisir dapat berperan sebagai daerah perlindungan ikan-ikan ekonomis penting seperti ikan baronang dan penyu, menyediakan nutrien ke perairan sekitarnya, memiliki fungsi sebagai produsen primer, pendaur ulang zat hara, sebagai habitat biota, tempat memijah ikan, mencari makan berbagai biota laut, stabilisator dasar perairan, perangkap sedimen, penahan erosi dan dapat memproduksi 10 gr bahan kering daun per hari. Pada habitat padang lamun hidup berbagai macam spesies hewan, yang berasosiasi dengan padang lamun, sebagai contoh di perairan teluk Ambon ditemukan 48 famili dan 108 jenis ikan yang adalah sebagai penghuni lamun, di Teluk Banten ditemukan 360 spesies, Pulau Bintan 33 jenis ikan dari 22 famili dan 72 jenis dari 39 famili ikan yang berasosiasi dengan lamun di teluk Awur Jepara. Kondisi ekosistem padang lamun di perairan pesisir Indonesia telah mengalami kerusakan sekitar 30%-60%. Kerusakan padang lamun di Manokwari berada dalam status kurang kaya dan miskin dengan prosentase 14-45% tahun 2008 dan 1-16% tahun 2009. Perairan Manokwari yang memiliki jenis kekayaan laut yang tinggi seperti lamun dan ikan yang tersebar di sepanjang perairan laut yang perlu dilestarikan karena dapat memberikan kontribusi pada peningkatan hasil perikanan dan sektor pariwisata. Namun penelitian dan informasi mengenai ekosistem ini masih sangat terbatas. Mengingat pentingnya peranan lamun dan ikan yang hidup didalamnya bagi ekosistem perairan laut dan semakin banyaknya tekanan dari aktivitas manusia maupun secara alami, maka perlu diupayakan pengelolaan yang baik dan berkelanjutan.
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Judul: A Continuous Vaccination Strategy in the SVIR Epidemic Model
Abstrak: Vaccination is conducted to minimize the spread of a disease. The vaccination is usually done several times within a fixed time interval. In the SVIR model, it is assumed that individuals do not get immediate immunity following a vaccination program. So according to process of vaccination on SVIR model, there are two strategies, i.e. the continuous vaccination strategy (CVS) and the pulse vaccination strategy (PVS). In this study, only the CVS strategy in epidemic model SVIR is considered. Results of the study indicate that dynamics of the CVS system depends on the basic reproductive number. If the basic reproductive number is less than one, then the disease-free fixed point is asymptotically stable. It means that the disease will eventually disappear from the population. Conversely, if the basic reproductive number is greater than one, then the endemic fixed point is asymptotically stable, which means that the disease will remain exist in the population. Simulation result shows that the vaccination would minimize the spread of disease by reducing the basic reproductive number. If the time for the vaccinated recipients to obtain the immunity, as well as a possibility of vaccinated recipients to be infected are neglected, then the disease will be eradicated. This condition is called an over-evaluating effect of vaccination.
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