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All Journal Journal of Marine Research Jurnal Kelautan Tropis
Bramasta, Arrico Fathur Yudha
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Earth & Planetary Sciences

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Pengaruh Perbedaan Intensitas Cahaya Terhadap Kelimpahan Arthropoda di Perairan Desa Tambakpolo, Demak Bramasta, Arrico Fathur Yudha; Setyati, Wilis Ari; Nuraini, Ria Azizah Tri
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (701.432 KB) | DOI: 10.14710/jmr.v9i1.25776

Abstract

ABSTRAK: Zooplankton merupakan organisme laut yang memiliki peran dalam rantai makanan di laut. Zooplankton berperan pada tingkat energi kedua yang menghubungkan produsen (fitoplankton) dengan konsumen tingkat tinggi. Penelitian ini bertujuan untuk mengetahui komposisi dan struktur komunitas Arthropoda dengan dua perbedaan intensitas cahaya (300 lux dan 2000 lux). Penelitian ini dilakukan menggunakan metode purposive sampling yang terdiri dari tiga stasiun. Pengambilan sample zooplankton dilakukan dengan bantuan plankton net yang ditarik kapal tiga kali pengulangan. Berdasarkan penelitian ditemukan 5 genus yaitu Calanus, Paracalanus, Sergia, Eucalanus dan Candacia. Genus yang paling banyak ditemukan adalah Calanus dan Sergia. Kelimpahan Arthropoda tertinggi terdapat pada Stasiun 1 dengan intensitas 2000 lux sebesar 8.492 ind/L dan terendah pada Stasiun 3 dengan intensitas 300 lux sebesar 2.286 Ind/L, hal ini diduga karena pengaruh gaya fototastik positif dari fitoplankton terhadap sumber cahaya yang direspon baik oleh zooplankton khususnya Arthropoda sebagai sumber makanan. Tingkat keanekaragaman (H’) Arthropoda di perairan tersebut termasuk dalam kategori rendah, indeks keseragaman (E) dalam kategori rendah, dan terdapat dominansi (C). ABSTRACT: Zooplankton are those organisms which have a role in  food-web in aquatic ecosystems. Zooplankton as second trophic level organism whose connects producers (phytoplankton) with consumers at a higher trophic level. This research aims to know the composition and structure of the Arthropode community with two differences in light intensity (300 lux and 2000 lux). This research was done by using purposive sampling method which consists of three stations, by using a plankton net that was pulled by the boat. The results of the study found five genera namely Calanus, Paracalanus, Sergia, Eucalanus, Candacia. The most common genera are Calanus and Sergia. The highest abundance of Arthropode at Station 1 with an intensity 2000 lux is 8.492 ind/L and the lowest at Station 3 with an intensity 300 lux is 2.286 Ind/L. The level of diversity (H') of Arthropode categorized as low, the index of uniformity (E) is categorized medium, the level of dominance (C) is classified as high.
Feeding habit and Predation Selectivity of Reef Fish Chaetodon octofasciatus in Artificial Patch Reef and Natural Reef of Panjang Island, Jepara Bramasta, Arrico Fathur Yudha; Munasik, Munasik; Haryanti, Dwi
Jurnal Kelautan Tropis Vol 27, No 3 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i3.21731

Abstract

Chaetodon octofasciatus is a species of fish in the Chaetodontidae family, commonly known as an indicator fish in the reef ecosystem as the frequency of its appearance in the wild can interfere with the state of the coral reef ecosystem in the waters. Panjang Island is located in Jepara, Central Java, Indonesia, in which one method of coral reef ecosystem rehabilitation in a a form of Artificial Patch Reef (APR) has been implemented. This study aims to investigate the levels of C. octofasciatus predation on corals in the APR and Natural reef of Panjang Island. We used the LIT (Line Intercept Transect) to measure the density of coral reefs at both locations. The abundance of C. octofasciatus was calculated using the Belt Transect method, while selectivity and bite ratio was observed and counted every 5 minutes. The results shows that C. octofasciatus from natural reefs have the highest predation rate (185 bites/5 min) and mostly eat the coral with lifeform massive while the ones from APR shows 144 bites/5 min and mostly eat the coral with lifeform Acropora branching. This selectivity could be due to the availability of corals in both areas. While massive corals were highly available in the natural reefs, branchich corals esp. Acropora is mostly planted in the APR. A more diverse coral lifeform in the natural reef also showed the type of corals that are less selected by C. octofasciatus such as submassive corals and Acropora tabulate, as well as corals with the foliose life form.  
Co-Authors Dwi Haryanti, Dwi Munasik Munasik Ria Azizah Tri Nuraini Wilis Ari Setyati