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Community structure of bivalvia and gastropods nearby water vegetation in Sentani Lake, Papua. Line’s transect and plot methods were used to determining the structure of mollusks and vegetation by using index, diversity, and dominance as parameters. Intentional measurement were carried out on several biological parameters of the waters at 10 sampling points. From the observation and measurments, we obtained seven types of mollusk with 5644 individuals, where six types are belong to gastropods and one type is a member of bivalves. The highest level of mollusk diversity was in Kwadeware, the highest at the inlet of the lake, and were dominated by Melanoides tuberculata and Pomacea canaliculata. In addition, vegetation found in the area observation were water hyacinth (Eichhornia crassipes), water spinach (Ipomoea aquatica), apu wood (Pistia stratiotes), genjer (Limnocharis flava), Hydrilla verticillata, seagrass (Potomogeton malainus), Nymphaea alba, Ceratophyllum demersum, and Nymphoides indica.Key words: gastropods; molluscs; vegetation; Sentani lake

Highland Wild Dog (HWD) is Canis hallstromi from Papua that was distributed in Puncak Jaya area and is close to tribal Amungme, Damal, and Moni Kamoro. The aim of the study is to find out the local knowledge of Amungme, Damal, Moni, and Kamoro tribes about the population and behavior of HWD. The research began on the interview, then continued to obeservation using 11 camera traps placed in Gresberg area in Puncak Jaya. Analysis used is interval level values, while for measuring the HWD density and behavioral we used documentation technic. Results of the interview provide various information from each tribe related to morphology, behavior, role, management, and mythology of HWD. Result of this study reveals that the Amungme and Moni tribes have a concept in the preservation of HWD. It could be seen from the habit of people who do not utilised the HWD for hunting. Instead, they prepare a place for nursery even a den for the dogs. All the informations collected from the community is also scientifically proven that HWD is C. hallstromi distributed in Papua, especially subalpine and alpine in Puncak Jaya, estimated population of HWD is ± 200 individuals. Observed behavior of these dogs are howling, rolling, rubbing, and having communal toilet spots. Generally, they have social behavior in groups with the number of 3-5 individuals and usually one of them is a male dog. Key words: Canis hallstromi;Ecology; Ethnoecology; Puncak Jaya.

Papua has a huge diversity of natural resources which can be categorized as well managed compare to other areas in Indonesia. The city of Jayapura and its surrounding are arranged to become an urban area nowadays. As an impact, many sector has changing including its land use. This research aims to understanding the knowledge, perception, and assesment of people regarding the environment particularly in Jayapura and its environs. The research was conducted in Jayapura City, Jayapura Regency and Keerom Regency with sampling method using survey, questionnaire and documentation. This research revealed that 53.0–90.0% of respondent knowing about environmental management and most of them (90.0%) gained those information from educational institution such as schools. Regarding government participation in environmental management, respondent answered that it is around 69.0–76.0% while for infrastructure and monitoring it is around 52.4-74.0% and 41.0-70.6% respectively. Concerning the environmental condition and its management the rate was 6.20 which can be categoized as good.Key words: people perception; environment; government; Jayapura.

The effect of chitosan on micropropagation of Dendrobium lasianthera J.J.Sm was observed. The media used was Vacin and Went (VW) modified with the addition of coconut water and given chitosan with several concentrations. The study was conducted at the Plant Tissue Culture Laboratory of the Department of Biology, Faculty of Mathematics and Natural Sciences, Cenderawasih University for 6 months, from April to September 2019. Experiments using a Completely Randomized Design (CRD) of 8 treatments with 3 explants in each bottle for total 3 bottle as a replication. The total explants used in this experiment was 72 explants. The concentration of chitosan were 0% , 1%, 5%, 10%, 15%, 20%, 40% and 50% separately. Observation data were analyzed using ANOVA, if there were significant differences followed by DMRT at the 5% level. Observation variables included number and length of roots, number and length of leaves. The results showed that giving chitosan 10% had a maximum effect on the number of roots and number of leaves, 6.67 and 4.67. As for the highest leaf length of 17.43 mm and the longest root length 19.21 mm were in the media with the addition of chitosan concentration of 15%. The observations showed that chitosan had a positive influence on the growth and development of orchids D. lasianthera plantlet in vitro.Keywords : Chitosan, orchid, Vacin and Went, plantlet.