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: Distribusi Spasial Komunitas Gastropoda dan Asosiasinya dengan Habitat Lamun di Pesisir Manokwari Papua Barat
Abstrak: Ekosistem lamun yang ada di perairan pesisir pada daerah yang dangkal merupakan ekosistem yang kompleks dan memiliki fungsi yang penting bagi berbagai organisme yang berasosiasi. Salah satu organisme yang berasosiasi dan dominan ditemukan dalam ekosistem lamun adalah gastropoda, yang sangat berperan dalam rantai makanan. Saat ini keberadaan habitat lamun dan gastropoda di Perairan Pesisir Manokwari terancam karena degradasi lingkungan dan dimanfaatkan oleh masyarakat setempat. Hal tersebut yang melatarbelakangi penelitian ini, yang dilaksanakan pada empat lokasi yakni Pesisir Rendani, Pesisir Wosi, Pesisir Briosi dan Pesisir Padarni. Adapun tujuan penelitian ini adalah: (1) Mengetahui dan menganalisis pengaruh parameter fisika-kimia perairan dan tekstur substrat terhadap komposisi spesies, frekuensi, persen tutupan dan kerapatan lamun, (2) Mengetahui dan mengkaji pengaruh kompleksitas habitat padang lamun terhadap kepadatan, keanekaragaman dan keseragaman serta distribusi spesies gastopoda.
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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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