One of the mangrove forest area in Numfor Island is the Syoribo Coastal Coast currently the destruction of mangrove ecosystems is increasingly widespread due to the opening of land to be used as residential and development areas so that there is a reduction in the area of mangrove forests. The research was conducted in April 2018 at the Syoribo Village Coastal Coast of East Numfor District of Biak Numfor District of Papua Province. This study aims to analyze the types and distribution of mangroves, Analyze the composition of species and structure of mangrove vegetation (density, frequency, and dominance), Analyze the mangrove habitat is environmental condition affecting mangrove growth, Analyze texture of substrate which is overgrown by mangrove, Analyze the linkage between mangrove density and substrate texture found. The method used in this study is by combination between path method and line method then substrate analysis was conducted in laboratory. The results showed that in the four observation transects in 7 mangroves species were Sonneratia alba, Rhizophora mucronata, Rhizophora apiculata, Bruguiera gymnorrhiza, Bruguiera cylindrica, Avicennia alba, and Xylocarpus granatum. The highest value index for tree, sapling and seedlings is the highest Bruguiera gymnorrhiza (197,82%), (160,71%), and (166,36%). Environmental conditions that affect mangrove growth are average temperature (27,6 0C – 29,4 0C), Salinity (6 ‰ – 24,3 ‰), Density (0,004 – 0,014), pH (7,12 – 7,57). The texture of the substrate overgrown by mangroves on the Syoribo, East Numfor have substrate criteria are dust silty clay loam, Silt Loam and sandy loam. Modeling the relationship between the density of tree level, spling, and seedling mangroves with substrate using multiple regression shows a close relationship between the two variables.

Coral reefs are unique ecosystems and only occur in the tropics area. Diversity, distribution, and coral growth are influenced by environmental factors. Coral colonies morphologies or coral lifeform rates vary significantly between species and between environmental factors. This study aimed to determine the variations of hard coral based on their lifeform; and assess the condition of reefs by measuring the percent cover of live coral in the coastal area of Rendani Airport. Coral cover and coral damage data gathering used a survey approach with Point Intercept Transect (PIT) method. The results showed the variations of coral lifeform in the coastal area of Rendani was relatively low, as indicated by the absence of some coral lifeforms in the study site. The most variation lifeform was found at 7m depth with five lifeforms, while the lowest was found at 3m depth with three lifeforms. The live coral cover reached 77,66% at station 1 and 75,00% at station 2, and the lowest coverage was 11,33% at station 3. The highest average of rubble at station 1 at 4.33% and dead coral with algae was found to be highest at station 3 at 8.00%.