Kelimpahan dan Nisbah Kelamin Siput Bakau (Telescopium Telescopium) di Ekosistem Mangrove Desa Darul Aman Kecamatan Rupat Kabupaten Bengkalis

Mangrove ecosystem in the coastal of Darul Aman Village has been seriously degradated. This condition can affect gastropods live in the area. The purpose of this study was to determine the density and sex ratio of mangrove snails Telescopium telescopium in mangrove ecosystem. This study was conducted in September 2014 in the mangrove ecosystems of Darul Aman Village Rupat Distric. The method used in this study was a survey method. Location study was divided into three stations. Snail T. telescopium sample was collected by hand-picking directly in five plots of 2 m x 2 m for each station. The snail sex determination was done from colour and shape observation of gonad in laboratory. Variance Analysis (ANOVA) was used to test the significance differences of mangrove snail density between stations. During the research, a total of 77 samples of snail mangroves, with sizes ranging from 59.0 to 98.1 mm and a weight of 24.83 to 84.26 g was obtained. Average density of mangrove snails obtained 0.60±0.379 to 2.05±0.411 (ind/m2). Mangrove snail density was significantly different between stations (sig.<0.05). Morisita index value at the third station shows that the distribution pattern of mangrove snail is uniform (Id <1.0). Sex ratio (male and female) of mangrove snails was 1: 1

Spacing Effect on the Percentage of Life and Growth of Rhizophora Apiculata in Mangrove Education Center Marine Station University of Riau

This research was conducted in March-May 2014 in central study mangrovemarine station University Riau. This study aims to determine the effect of spacingon percentage seedling survival and growth of Rhizophora apiculata. The methodused in this research were experimental methods. Spacing treatment tested in thisstudy were: (1) Planting with a distance of 25 cm x 25 cm (2) Planting with adistance of 50 cm x 50 cm (3) Planting with a distance of 75 cm x 75 cm and (4)Planting by distance planting 100 cm x 100 cm. The results of the study for 45days was observed that the percentage of survival of the seedlings of Rhizophoraapiculata in various types of treatment spacing of the percentage of live 100%.Seedling height growth of Rhizophora apiculata good are at a spacing of 75 cm x75 cm (treatment C3) with average growth height of 0.080 cm/day. Meanwhile,the best steam diameter growth is best on Rhizophora apiculata are at a spacing of25 cm x 25 cm (treatment A2), with a trunk diameter growth of 0.0030 cm / day.The highest growth the number of leaves on the seedlings reached 4.9 strandscontained in a spacing of 25 cm x 25 cm (treatment A1). The data showed thatthere was effect of spacing on height growth, diameter growth and number ofleaves on Rhizophora apiculata seedlings, while the Anova test obtained therewas no the significant effect of spacing (Sig. > 0.05). It means that the proposedhypothesis (Ho) is accepted and (Ha) was rejected, which indicates that theprovision of spacing did not significantly affect height growth, diameter growthand number of leaves on Rhizophora apiculata seedlings during the observation

The Relationships Between Density of Mangroves and Sediment Organic Content with Macroepifauna Abundance in Anak Setatah Village, District of Meranti Archipelago

The research was conducted in December 2015 in Anak Setatah Village, District of Meranti Archipelago. This research aimed to analyze the density of mangrove, sediment organic content, abundance of macroepifauna, relationships between density of mangrove and organic content in sediment with macroepifauna abundance. Mangrove density measurements was done using 10 x 10 m² observation plots, whilst sampling of macroepifauna using 5 x 5 m² plot with two replication at each plot. The results of the research showed that water quality parameters measured were still in the range of water quality criteria for marine organisms. Density of mangrove in Station 1 was 2,283.33 ind/ha and in Station 2 was 1,283.33 ind/ha. The sediment organic content in Station 1 was 15.10 % and Station 2 was 15.50 %. The macroepifauna abundance in Station 1 was 4,600 ind/ha and Station 2 was 1,200 ind/ha. Non significant posititive correlation between sediment organic content and macroepifauna abundance was found which shown by regression equation in Station 1 y = 2966,8 + 72,851x, R2 = 0,002, r = 0.04 and Station 2 y = 483.1 + 20.435x, R2 = 0.0007, r = 0.026. Non significant postitive correlation between mangrove density and macroepifauna abundance was also found and shown by regression equation y = 1266.5 + 0.3081x, R² = 0.105 r = 0.324 (Station 1) and y = 503.27 + 0.2312x, R2 = 0.0108, r = 0.103 (Station 2)

Distribusi dan Nisbah Kelamin Kerang Lokan (Polymesoda Expansa) di Perairan Pantai Desa Sungai Bela Kecamatan Kuala Indragiri Kabupaten Indragiri Hilir

Penelitian ini dilaksanakan pada bulan Mei 2014. Eksploitasi kerang lokan (P.expansa) yang dilakukan nelayan selama ini tanpa memperhatikan ukuran yangditangkap mulai dari yang besar sampai yang relatif kecil. Tujuannya untukmengetahui distribusi dan nisbah kelamin kerang lokan. Metode survey digunakanpada 3 zona intertidal, selanjutnya dilakukan analisis sampel dilaboratorium.Kelimpahan kerang lokan tertinggi ditemukan pada zona upper sedangkankelimpahan yang terendah ditemukan pada zona lower. Nisbah kelamin pada zonalower seimbang, sementara zona middle dan upper sebaliknya, namun rata-ratanyaseimbang. Pola distribusi mengelompok pada zona upper dan merata pada zona lowerdan middle (Indeks morisita 1,052 dan 0,643) Analisis Chi – square memperlihatkansebaran yang tidak acak (χ2 hitung ˂ χ2 tabel)

Nitrates and Phosphates Content in the Water and Sediment in Seagrass Ecosystem in the North of Coastal Area of Rupat Sub Distric Bengkalis Riau

This research was take place in north Rupat island beach, Bengkalis regency Riau province on January 2016. The purpose of this research is to find out the contents of nitrate and phosphate in the water of seagrass ecosystem in north Rupat island and to find out the contents of nitrate and phosphate in the sediment of seagrass ecosystem in north Rupat island as well as to find out the difference of nitrate and phosphate contents in the water and sediment between station. The parameter that have been observed is the physics and chemist of water parameter. Transect squares device was use to calculated the density. While to determine nitrate and phosphate in the water leads to Saeni and Latifah in Sanggam, 2008 and to determine nitrate and phosphate in sediment leads to Siaka et al., 1998. Base on research result the average content of nitrate in the water is 0.2264-0.2417 mg/L, and in the sediment 0.1347-0,.5319 mg/L. While the average content of phosphate in the water was 0.1991-0.2433 mg/L, and in the sediment 0.2507-0.3872 mg/L. The density of seagrass on each station in north Rupat island beach was about 23.66-154.66 stands/m2. From the result of this research we found from the t test result, the significant differences of content of nitrate and phosphate in water an cediment show that the differences is not significant, show that the condition of north coatsal of Rupat island is water that has midlle level of pressure and polution