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Struktur Komunitas Makrozoobentos di Pantai Tanah Merah, Perairan IKN Baru, Kalimantan Timur Suryana, Irma; Ritonga, Irwan Ramadhan; Paputungan, Mohammad Sumiran; Agathajani, Brigitha Anjeli; Elisar, Elisar
Journal of Marine Research Vol 13, No 3 (2024): Journal of Marine Research
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jmr.v13i3.41556

Abstract

Makrozoobentos mampu hidup di sedimen lumpur, pasir, batu, kerikil maupun sampah organik di perairan laut, sungai, kolam ataupun danau. Ia merupakan organisme yang berperan dalam rantai makanan sebagai konsumen primer dan konsumen sekunder serta membantu terdistribusinya nutrien dan mineral di substrat perairan. Penelitian pendahuluan ini diharapkan dapat memberikan gambaran tentang struktur komunitas Makrozooobentos di pantai Tanah Merah Samboja, serta melihat jenis substrat sedimen dan kandungan nutriennya. Peletakkan kuadran plot berukuran 2 x 0,25 m2 pada luasan 2400 m2 yang terbagi menjadi 6 titik pengamatan pada zona subtidal memperoleh 182 individu Makrozooobentos yang teridentifikasi sebagai 19 spesies kelas Gastropoda, 15 spesies Bivalvia dan 1 spesies dari kelas Scapopoda. Kelimpahan total dikonfirmasi sebesar 228 ind/m2 dimana pola sebaran kelimpahan per titik linear dengan kandungan Nitrat, Ortofosfat, total Fosfat dan Karbon organik dalam sedimen. Indeks keanekaragaman, keseragaman dan dominansi secara berurutan terukur 3,085 (tinggi), 0,854 (tinggi) dan 0,064 (tidak ada jenis yang mendominasi). Adapun persentase fraksi pasir dalam kisaran 90-97% sebagai kategori tipe substrat.   Macrozoobenthos lives on mud, sand, stone, gravel or organic waste in the ocean floor, river, pond or lake. It is an active organism in the food chain as a decomposer and contributes to spreading some nutrients and minerals on the sediment substrate. This first record research had been to describe the structure community of Macrozoobenthos at Tanah Merah’s beach in Samboja district, also analyzed the type of substrate and the composition of the nutrient. The laying plot in size 2 x 0,25 m2 on the area of 2400 m2, which divided into six substations was, found 182 individuals of Macrozoobenthos, which is confirmed as 19 species of Gastropods, 15 species of Bivalva and 1 species of Scaphopoda. The total abundance was 227,5 ind/m2, whereas each substation's distribution pattern had linearity with nitrate, orthophosphate, total phosphate, and C-organic contents in the sediment. The diversity, uniformity, and dominance index sequentially confirmed 3,085 (high), 0,854 (high), and 0,064 (low). Then, it was confirmed sand fraction in range 90-97% for the type of substrate.
MACROZOOBENTHOS ABUNDANCE IN THE MANGROVE AREA OF TANAH MERAH SAMBOJA KUTAI KARTANEGARA EAST KALIMANTAN Ritonga, Irwan Ramadhan; Suryana, Irma; Elisar, Elisar
Jurnal Perikanan Unram Vol 14 No 3 (2024): JURNAL PERIKANAN
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jp.v14i3.975

Abstract

Tanah Merah Beach is a coastal area of Samboja in East Kalimantan, which is a local tourist destination. The association of coastal ecosystems can be shown by macrozoobenthos, as one of the biota components in coastal areas to mangroves. This study identifies the species, calculates the abundance, and analyses the ecological index of macrozoobenthos, as well as looking at the relationship between nutrients and sediment texture with the number of macrozoobenthos found. The purpose of this research is to determine the condition of nutrients in the sediment substrate to its abundance in the mangrove ecosystem area. Sampling was conducted at three points based on the percentage of mangrove canopy cover in the Monmang version 2.0 application, with each point represented by 3 quadrant points measuring 0.25 m2. The results showed that the percentage of mangrove canopy cover was categorised as slight-moderate, the abundance of individuals was dominated by the Gastropoda class with 9 species and a small proportion of the Bivalve class. The ecological indices in order are the Diversity Index (H') in the low category, Diversity (E) in the low category, and dominance (C) found Cerithidae sp species dominating each point. The highest abundance was found at radius 2 canopy cover 77.24 - 83.13%. Nutrient content in sediment, nitrate (1.00-16.25 mg/L), phosphate (29.01-83.94 mg/L), organic carbon (2.23-3.24%) with confirmed sediment texture of sandy loam. Nitrate content ranged from 1.00-16.25 mg/L, Phosphate 34.65 - 44.51 mg/L and Organic carbon 2.23-3.24% (per mg) in the sediment and a significant effect of phosphate content on Macrozoobenthos abundance was found in the correlation test results.