Kima merupakan salah satu jenis molusca laut yang banyak ditemukan di perairan Raja Ampat. Hewan ini dilindungi di seluruh dunia termasuk di Indonesia. Penelitian ini dilakukan pada bulan Maret-April 2014, di perairan Amdui yang memiliki ekosistem terumbu karang, dan ditetapkan 3 lokasi pengamatan yaitu: Pulau Ayem, Teluk Sawawris dan Teluk Sawros. Metode yang digunakan pada penelitian ini adalah metode observasi dengan teknik belt transek, dan bertujuan untuk mengetahui jenis dan kelimpahan kima di perairan Amdui. Kima yang ditemukan di perairan laut Kampung Amdui Kabupaten Raja Ampat yaitu 8 jenis terdiri dari T. crocea, T. maxima, T. squamosa, T .gigas, H. porcellanus, H. hippopus, T. tevoroa dan T.derasa. Kelimpahan relatif kima pada stasiun I tertinggi didominasi oleh jenis T. maxima dengan persentase 48.387 % dengan kelimpahan relatif terendah pada jenis T.squamosa dengan persentase 3.225 % dan kepadatan terendah pada jenis T.squamosa dengan persentase 0.002 individu/m2 .. Kelimpahan relative kima tertinggi pada stasiun II didominasi oleh jenis T. maxima yaitu 38.805 % dan kelimpahan relative terendah pada jenis T. squamosa adalah 2.985%. Kepadatan terendah adalah 0.004 individu/m2 pada jenis T.maxima.Sedangkan kepadatan tertinggi pada jenis T. maxima adalah 0.052 terdapat pada stasiun II. Kelimpahan relative kima tertinggi pada stasiun III didominasi oleh jenis T.crocea yaitu 139.860%, dan dengan kelimpahan relative terendah pada jenis T.tevoroa adalah 0.699% dengan kepadatan kepadatan tertinggi pada jenis T.crocea adalah 0.112 individu/m2 .

One of the coastal ecosystems that has a high primary productivity, seagrass, makes it a places to find foods (feeding ground), spawn (spawning ground), and shelter for most fish. Whether the structure of fish communities on seagrass beds in the coastal waters of Doreri Bay based on day and night observation times is different from previous studies. This study aims to examine the structure of fish communities on seagrass beds in the coastal waters of Doreri Bay, between the time of observation and compared to previous studies. Data collection takes place during April-May 2019. The method used in this study is a descriptive method, using 1 and 1.5 inch gills net. The results of the study found that seagrass beds in Doreri Bay waters were more than in previous studies, which consisted of 10 species of seagrasses from 2 families (Hydrocharitaceae and Cymodoceaceae). The composition of fish is 56 species with a total of 91 individuals during the day and 189 individuals at night. Fish community structure in Doreri Bay waters has moderate diversity and uniformity while low dominance. Efforts should be made to protect seagrass ecosystems so that fish resources in the Doreri Bay region are maintained.

Gastropods plays an important role in the food chain on seagrass ecosystem and its existence are depend on the physical-chemical factors in the seagrass ecosystem. This study aims to determine the density and diversity of gastropods associated in seagrass habitat in Nusi and Gersen coastal waters. The measurement results of some physical-chemical waters variables, are still quite good for the life of gastropods. Species composition of gastropod in Nusi at higher than at the Gersen, but instead of individual density in Gersen more higher than Nusi. Diversity index of gastropods at Nusi station is higher (3,757) than Gersen (3.053), on the contrary the eveness and dominance index are higher at Gersen station than Nusi station. Community similarity index by species is low between the two stations, which indicates that the species of gastropods at both stations is quite different. The influence of human activity and higher utilizatin of gastropods in Nusi has lowered the density of gastropods in seagrass habitat, so it needs awareness efforts on the importance of gastropods and the seagrass habitat for coastal ecosystem.

The productivity of mangrove litterfall is the most important part of the transfer of organic materials from mangrove vegetation into the waters and soils. This research was conducted in July-August 2021 in three stations on mangrove ecosystem at Wasti Lake, Manokwari Regency. The purpose of this study was to determine the mangrove vegetation, litterfall production of Sonneratia alba, relation of Diameter at Breast High with litterfall production, and physical chemistry of the environment. The quadrant transect was used to sample mangrove vegetation and the litter trap to measure litter production. The results showed 5 types of mangroves, namely Sonneratia alba, Rhizophora stylosa, Rhizophora apiculata, Bruguiera gymnorrhiza, and Bruguiera sexangua. The highest density values ​​at each station was Sonneratia alba, namely 360 ind/ha, 540 ind/ha and 520 ind/ha with important value indexes are 268.08%, 255.59%, and 247.96%. The total litterfall production of Sonneratia alba during a period of 28 days was 79.19 gr/m². The highest litter contribution components came from leaves (87.6%), twigs (8.1%), and flowers (4.3%). Correlation and regression analysis showed a very strong positive relationship between DBH and litter production. The environmental parameter values ​​for DO ranged from 6.2-8.4 mg/L, water temperature 28.7 – 35.6⁰C, pH ranged from 7.06 – 7.47, salinity 25 – 27.5, substrate pH 6.1 – 6.3, the air temperature is 29-32⁰C, and the humidity is 70-80%.

Numfor yang memiliki padang lamun beserta biota asosiasi di dalamnya. Sayangnya informasi terkait struktur komunitas beserta kondisi lingkungan perairan bivalvia di Pulau Meosmangguandi masih minim. Penelitian ini bertujuan untuk mengetahui struktur komunitas bivalvia di ekosistem lamun Pulau Meosmanggaundi. Pengambilan sampel pada bulan Agustus-September 2021 yang dilakukan pada dua stasiun pengamatan menggunakan metode garis transek dengan plot kuadran berukuran 50 x 50 cm. Hasil penelitian menunjukkan bahwa terdapat 9 spesies Bivalvia yaitu Anadara antiquata, Fragum unedo, Tellina remies, Pinna incurva, Dosinia dilecta, Malleus malleus, Spondylus candidus, Spondylus violaceus, dan Spondylus albibarbatus. Kelimpahan tertinggi pada stasiun pertama untuk jenis lamun Fragum unedo sebanyak 6,8 Ind/m 2 . Sementara stasiun kedua, kelimpahan tertinggi untuk jenis Spondylus albibartus sebanyak 4,4 Ind/m 2 . Pada habitat ini memiliki keragaman sedang dengan Indeks keanekaragaman Bivalvia di stasiun I dan stasiun II yaitu 1,68 dan 2,13. Indeks kemerataan pada dua stasiun memiliki indeks yang sama yaitu 0,97, termasuk dalam ketegori stabil. Indeks dominansi dan indeks kekayaan spesies terkategori rendah.