This research was conducted in Eri Beach, Ambon Bay on November 2016 to study community structure which consist of species composition, density and occurrence frequency of macro algae.  Sample of macro algae was collected by using belt transect method.  The results showed that there were 11 species of macro algae in the area which were belonged to 11 genera, 9 families, 8 orders, 3 classes and 3 divisions. Those species were Halimeda opuntia and Caulerpa serrulata (Chlorophyta), Padina minor and Turbinaria ornata (Phaeophya), Amphiroa rigida, Galaxaura rugosa, Ceratodictyon spongiosum, Gracilaria Salicornia, Laurencia papillosa, Acanthophora muscoides and Halymenia durvillaei (Rhodophyta). The highest density was represented by Amphiroa rigida (2.02 ind/m2) while the highest relative frequency of occurrence belonged to Padina minor (27%). Keywords : Community, macro algae, density, Eri, Ambon Bay   ABSTRAK Penelitian ini bertujuan untuk mengetahui struktur komunitas makro alga meliputi komposisi jenis, frekuensi kehadiran serta kepadatan di Pantai Eri. Penelitian dilakukan pada bulan November 2016. Stasiun pengamatan makro alga yaitu di perairan pantai Eri. Metode sampling menggunakan Belt Transect. Hasil penelitian ditemukan 11 spesies, 11 genus, 9 famili, 8 ordo, 3 kelas dan 3 devisi. Chlorophyta terdiri dari Halimeda opuntia dan Caulerpa serrulata. Phaeophya terdiri dari Padina minor dan Turbinaria ornata. Rhodophyta terdiri dari Amphiroa rigida, Galaxaura rugosa, Ceratodictyon spongiosum, Gracilaria Salicornia, Laurencia papillosa, Acanthophora muscoides dan Halymenia durvillaei. Kepadatan jenis tertinggi spesies A. rigida (2.02 ind/m2) dan frekuensi kehadiran relatif tertinggi spesies Padina minor (27%).

Holothuria atra merupakan salah satu teripang dan sering dijumpai berasosiasi dengan padang lamun dan  substrat pasir.  Walaupun bernilai ekonomi rendah, secara ekologi mempunyai manfaat sebagai bioturbator dan mempunyai potensi dalam bidang farmaseutical. Teripang ini ditenukan hidup di Pulau Panjang, dengan karakteristik perairan tertutup dan dangkal dengan akses yang mudah untuk wisatawan maupun perikanan tangkap yang dapat menjadi tekanan bagi populasi teripang tersebut. Penelitian ini bertujuan untuk untuk mengetahui hubungan panjang dan berat populasi teripang H. atra di Pulau Panjang, Jepara pada lokasi padang lamun dan pecahan karang dimana H. atra banyak ditemukan. Metode penelitian yang dipergunakan adalah metode deskriptif eksploratif dengan melakukan pengambilan sampel H. atra dengan teknik sampling complete enumeration pada luas lokasi penelitian yang telah ditentukan.  Hasil penelitian  menunjukkan kepadatan teripang di stasiun padang lamun (Stasiun A) lebih rendah dengan distribusi ukuran yang lebih kecil daripada di stasiun pecahan karang (Stasiun B). Pada semua stasiun dan waktu pengambilan sampel, pola pertumbuhan relatif yang ditunjukkan oleh hubungan panjang dan berat teripang H. atra bersifat allometrik negatif dengan keeratan hubungan yag sangat kecil. Hal ini disebabkan oleh kesulitan pengukuran pada teripang yang bertubuh lunak dengan elastisitas dinding tubuh (integument), isi pada sistem pencernaan makanannya dan kandungan cairan coelomic (rongga tubuh) yang dapat membuat bias analisa.Holothuria atra is one of species sea cucumbers often found in association with seagrass beds and sand substrates. Although it has low economic value, ecologically it has benefits as a bioturbator and has potential in the pharmaceutical. It is found in Panjang Island, which has characteristic of  closed and shallow waters with easy access for tourists and capture fisheries which can put pressure on the sea cucumber population. This study aimed to determine the relationship between length and weight of H. atra population in the seagrass bed and rubble area in Panjang Island, Jepara. The research method used is descriptive exploratory and H. atra were sampled using a complete enumeration sampling technique at a predetermined area of the research location. The results showed that the density of sea cucumbers at the seagrass beds station (Station A) was lower with a smaller size distribution than at the rubble station (Station B). At all stations and sampling times, the relative growth pattern shown by the correlation between length and weight of H. atra is negative allometric with very small relationship value. This was due to the difficulty of measuring soft-bodied sea cucumbers with the elasticity of the body wall (integument), the contents of the digestive system and coelomic fluid in the body cavity which can bias the analysis.

Brown algae contains alginate is a hydrocolloid compound. This study aims to determine the types of brown algae as alginate producers in the coastal waters of Ambon island, Tial and Liang villages, Central Maluku. This research was conducted in April 2021. Sampling is carried out by means of free collection at low tide, at the time of sampling it is visually observed the condition of the substrate on which brown algae. Liang village beach as a whole has a variety of substrates of rocky, rocky sand, sand mixed with dead coral. However, in the sampling area, it was found that the dominant substrate was rocky sand substrate, and dead coral. Tial village beach has four types of substrates, namely rocky substrates in area A directly adjacent to the coast and have a substrate area of 2,250 m2 (15%), coral fault substrates and rocky in area B are in the littoral zone have a substrate area of 3,000 m2 (20%), sand substrates and coral faults in area C are in the littoral zone have a substrate area of 5,250 m2 (35%) coral substrates in area D are directly adjacent to the subtidal area and have a substrate area of 4,500 m2 (30%). All four substrates are in the intertidal zone. The substrates that cover the observation area a lot are sand substrates and coral faults. The results of the identification of brown algae species on the shores of Liang and Tial villages found four species classified in one division, one class, two families, and three genera. The diversity of brown algae species in the coastal waters of Tial there are three types of brown algae, Sargassum duplicatum, Turbinaria ornata, and Padina minor and on Liang beach there are two species of brown algae, Sargassum polycyctum and Padina minor. The four types of brown algae found have the potential to be a source of alginate

Contaminants entering marine systemts have become environmental issues because of their significantly negative impacts. Coasts of Rumah Tiga Village are connected to Ambon Bay and provide marine habitats and tourist attractions due to their location close to Merah Putih Bridge (including recreations, restaurants and aquaculture sites). These human related activities contribute to the discharge of wastes into marine waters. Due to their location at inshore outer Ambon Bay, marine pollutants from the bay tend to be applied at the location. Because of the concentrated pollutants at the location, the coasts of Rumah Tiga Village are a suitable location to conduct beach clean-ups in Ambon Bay. The beach clean-up activities also aim to allow Study Program of Marine Science of Faculty of Fisheries and Marine Sciences, Pattimura University to raise awareness to its students and local community to care for environment.

Seagrass communities play an important role in marine environments and estuary area, supporting communities of fish, snails and shellfish and other invertebrates. The diversity of seagrass species in the world is very low (<60 species). The coastal waters of Ori Village have a seagrass community that has never been studied. The purpose of this study was to estimate the structure of the seagrass community in the coastal waters of Ori Village, Central Maluku which includes the composition of type, density, frequency of occurence and percent of coverage. Seagrass sampling uses the line transect method. Five species of seagrass were found during the study grouped into two families: Cymodoceaceae and Hydrocharitaceae. The seagrass species found were Cymodocea rotundata, Halodule pinifolia, Enhalus acoroides Halophila ovalis and Thalassia hemprichii. T. hemprichii and E. acoroides have the highest densities (157 shoots/m2 and 137 shoots/m2, respectively). E. acoroides and T. hemprichii also have the highest frequency of occurence and relative coverage percent compared to other seagrass species found in the waters of Ori Village. Seagrass community in the waters of Ori Village is classified in a tight condition until dense.   ABSTRAK Komunitas lamun memegang peranan penting di lingkungan laut dan daerah estuari, menyokong komunitas ikan, siput dan kerang-kerangan serta invertebrata lainnya. Keragaman spesies lamun di dunia sangat rendah (<60 spesies). Perairan pantai Desa Ori memiliki komunitas lamun yang belum pernah diteliti. Tujuan dari penelitian ini adalah untuk mengestimasi struktur komunitas lamun di perairan pantai Desa Ori, Maluku Tengah yang meliputi komposisi jenis, kerapatan, frekuensi kehadiran dan persen penutupan. Pengambilan sampel lamun menggunakan metode transek garis. Lima spesies lamun ditemukan selama penelitian yang dikelompokan dalam dua famili yaitu famili Cymodoceaceae dan Hydrocharitaceae. Spesies-spesies lamun yang ditemukan adalah Cymodocea rotundata, Halodule pinifolia, Enhalus acoroides Halophila ovalis danThalassia hemprichii. T. hemprichii dan E. acoroides memiliki kerapatan tertinggi (masing-masing 157 tegakan/m2 dan 137 tegakan/m2). E. acoroides dan T. hemprichii juga memiliki frekuensi kehadiran serta persen penutupan relatif tertinggi dibanding spesies-spesies lamun lainnya yang ditemukan di perairan Desa Ori. Komunitas lamun di perairan Desa Ori tergolong dalam kondisi rapat sampai padat.   Kata Kunci: Lamun, komunitas, kerapatan, penutupan, Maluku Tengah