The coastal ecosystem that has high biological productivity is seagrass. Seagrass has ecological functions, namely as nursery, foraging, and spawning areas for organisms. Identification of seagrass species using the transect method in the waters of Penimbangan Beach, North Bali, was conducted in 2020, aiming to identify seagrass species and seagrass cover conditions in the coastal waters of Penimbangan, North Bali. The method used in this activity was the quadratic transect method, which consisted of a transect (straight line) and a quadratic frame (a rectangular frame placed on a line). The seagrass species found consisted of six species, which belonged to two families: the Hydrocharitales family with three species, namely Thalassia hemprichii, Halophila ovalis, and Halophila decipiens, and the Potamogetonaceae family with three species, namely Halodule uninervis, Cymodocea rotundata, and Syringodium isoetifolium. The density of seagrass varied but did not exceed 25 stands/m2, indicating very rare density of seagrass in these waters. Halodule uninervis species played an important role in seagrass communities in the waters of Penimbangan Beach with an Important Value Index of 89.36% at station I and 73.43% at station II. The novelty of this research is that there has not been any research on seagrass at the coast of Penimbangan, North Bali.

Whale sharks are often found in locations near the coast or river mouths. The whale shark (Rhincodon typus) is one of three species of whales whose feeding habits are carried out by sucking and filtering (filter feeders). The purpose of this study was to calculate the population and size, determine the presence of wounds and measure some water quality (temperature, pH and salinity). The method used is to use the photo ID method which aims to distinguish between individuals from one another and direct or visual monitoring methods to record the presence of injuries, gender and behavior of whale sharks. A total of 20 individuals have been identified at the time of carrying out the research, 2 of which are new individuals or have never been identified before with an average length of 4 -6.8 meters (juvenile category). The smallest size is 4 meters while the longest reaches 6.8 meters. All identified individuals were male and had wounds on the fins and tail. The water quality measured was still optimal for the presence of whale sharks (temperature ranged from 28-30 oC; pH 7 and salinity ranged from 28-30 0/00).

Hutan mangrove merupakan hutan yang tumbuh di daerah air payau dan dipengaruhi oleh pasang surutnya air laut. Keberadaan hutan mangrove sekarang ini cukup mengkhawatirkan karena ulah manusia untuk kepentingan konversi lahan sebagai tambak, pemukiman, perhotelan, ataupun tempat wisata. Praktek ini dilaksanakan pada 4 Maret hingga 10 April bertujuan untuk mengetahui jenis vegetasi, kerapatan dan Indeks Nilai Penting (INP) mangrove Wana Tirta di Kulon Progo Daerah Istimewa Yogyakarta. Pengambilan data dilakukan dengan menggunakan metode kombinasi antara metode transek dan metode kuadrat yaitu metode transek kuadrat.Analisis vegetasi meliputi kerapatan jenis, kerapatan relatif, frekuensi jenis, frekuensi relatif, dan indeks nilai penting. Ditemukan 6 jenis mangrove yaitu Acanthus ilicifolius, Avicennia alba, Avicennia marina, Nypa fruticans, Rhizophora mucronata, dan Sonneratia alba. Kerapatan jenis keseluruhan tingkat pohon di stasiun I adalah 12200 Ind/Ha dan di stasiun II adalah 5800 Ind/Ha. Stasiun I memiliki INP 198.11% untuk Rhizopora mucronata 52.67% untuk Avicennia alba dan 49.22% untuk Avicennia marina dan stasiun II memiliki INP 181.75% untuk Rhizopora mucronata 70.46% untuk Sonneratia alba dan 47.79% untuk Avicennia alba.

Penelitian ini bertujuan untuk mengetahui pola sebaran dan keanekaragaman lamun di perairan Pallette dan Tangkulara. Penelitian ini dilakukan selama dua bulan, mulai Agustus hingga September 2019. Pengumpulan data dilakukan di dua titik dengan masing-masing tiga ulangan. Pengambilan data lamun menggunakan metode transek garis dan kuadran. Hasil penelitian menunjukkan bahwa terdapat 5 jenis lamun yang ditemukan di perairan Pallette dan Tangkulara, yaitu Enhalus acoroides, Thalassia hemprichii, Halodule uninervis, Cymodocea rotundata, dan Halophila sp. Keanekaragaman jenis lamun di perairan Pallette dan Tangkulara masuk dalam kategori rendah. Pola sebaran jenis lamun Thalassia hemprichii, Halodule uninervis, Cymodocea rotundata, Halophila sp. memiliki nilai pola distribusi yang mengelompok sedangkan untuk Enhalus acoroides pola distribusinya yang seragam.

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