Korelasi Klorofil-a dengan Nutrien dan Kualitas Perairan di Pulau Seruni Karimunjawa Indonesia

Abstract

Seruni Island is one of the islands located in the easternmost and is an uninhabited island in Karimunjawa, Jepara Regency, Central Java. Seruni Island has a tourist attraction, namely a stretch of white sand, coral reefs, and which is currently used by local people for seaweed cultivation. There are still many tourism opportunities and marine utilization that have not been utilized optimally. Knowing the availability of chlorophyll-a and its correlation with nutrients (ammonia, nitrate, and phosphate) and water quality on Seruni Island can provide an initial overview of the fertility conditions of the waters on Seruni Island so that other marine utilization opportunities can be wide opened. In situ data are collected such as seawater samples, which are then analyzed in the laboratory, as well as water quality parameters including salinity, pH, DO, temperature and brightness. Although Seruni Island is an uninhabited island, however, it is possible that there will be runoff from the surrounding inhabited islands, which will increase the concentration of chlorophyll-a. The results showed that chlorophyll-a had a high and negative correlation with nutrients, namely ammonia (r=-0.985), and water quality, namely temperature and brightness (r=-0.895 and r=-0.734). Pulau Seruni merupakan salah satu pulau yang lokasinya terletak paling timur dan merupakan pulau tidak berpenghuni di Karimunjawa, Kabupaten Jepara Jawa Tengah. Pulau Seruni memiliki daya tarik wisata yaitu hamparan pasir putih, terumbu karang, dan yang saat ini dimanfaatkan masyarakat setempat untuk budidaya rumput laut. Masih banyak peluang wisata dan pemanfaatan bahari yang belum dimanfaatkan secara optimal. Dengan mengetahui ketersediaan klorofil-a dan korelasinya terhadap nutrien (ammonia, nitrat dan fosfat) dan kualitas perairan di Pulau Seruni dapat memberikan gambaran awal terkait kondisi kesuburan perairan yang ada di Pulau Seruni, sehingga dapat terbuka peluang pemanfaatan bahari lainnya. Data in situ yang diambil berupa sampel air laut, yang selanjutnya dianalisis di laboratorium, serta parameter kualitas perairan meliputi salinitas, pH, DO, suhu dan kecerahan. Walaupun Pulau Seruni merupakan pulau yang tidak berpenghuni, namun demikian tidak menutup kemungkinan terdapat limpasan massa air yang berasal dari pulau sekitarnya yang berpenghuni yang berdampak pada meningkatnya konsentrasi klorofil-a. Hasil penelitian menunjukkan klorofil-a memiliki korelasi yang tinggi dan bernilai negatif dengan nutrient, yaitu ammonia (r=-0,985), dan kualitas perairan yaitu suhu dan kecerahan (r=-0,895 dan r=-0,734). Kata kunci : klorofil-a, nutrient, kualitas perairan, Korelasi, P.Seruni

Comparative Study on the Microplastics Abundance and Characteristics in Marine Protected Area in Karimunjawa National Park, Indonesia

“…While, Seruni Island is chosen to represent the outside area of KNP. Seruni Island is an uninhabited island but has high biodiversity, characterized by the diversity of coral reefs, pelagic fish and seaweed cultivation (Widiaratih et al, 2022).…”

“…Even though Seruni Island is outside the KNP area and uninhabited island, but still has good biodiversity and used for local people for seaweed cultivation. However, there was influence from surrounding areas, who the nearby people are lived in Genting Island which is next to the Seruni Island and impacted to the high MPs due to anthropogenic activity from settlement (Widiaratih, et al, 2022). Moreover, the waves in Seruni island are higher than the MPA area, due to it located further to east side of Karimunjawa which directly border to the offshore in its surrounding.…”