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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences
Andrianus Sembiring
Yayasan Biodiversitas Indonesia
Earth & Planetary Sciences

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Cryptic Species from Biodiversity Hotspot: Estimation of Decapoda on Dead Coral Head Pocillopora in Raja Ampat Papua Eka Maya Kurniasih; Andrianus Sembiring; Ni Putu Dian Pertiwi; Aji Wahyu Anggoro; Ni Kadek Dita Cahyani; Muhammad Dailami; Ambariyanto Ambariyanto; Diah Permata Wijayanti; Christopher P. Meyer
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 25, No 1 (2020): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (404.259 KB) | DOI: 10.14710/ik.ijms.25.1.1-6

Abstract

Cryptic organisms that live within the interstices of reef habitats contribute significantly to coral reef biodiversity. One example of this cryptic biodiversity is the high abundance of decapods in dead coral heads that associated with various biota. However, this diversity poorly studied especially species identification and species richness. This study aims to estimate the decapods diversity in Raja Ampat, Papua, using Pocillopora dead coral head method as semi-quantitative sampling approach. Raja Ampat in Papua is chosen because it situated in the center of Coral Triangle marine hotspot. Data were collected from 10 dead coral heads of genus Pocillopora from 10-meter depth near the islands of Kri and Misool. This study observed a total of 205 individuals Decapoda from Kri Island and 672 Individual from Misool Islands. Species richness observation (Chao1 and ACE) of the total samples reports only 11 families of decapoda detected in this study. Rarefaction curve reach an asymptote after all after all ten dead coral were analyzed; indicating that additional sample collection would not change estimates of diversity found in this study. The Shannon-Wiener index diversity on the Kri Island showed lower diversity value (2.09) compared to Misool Island (2.18). In the future, this research can be used as a basis for understanding the diversity of coral reefs as well as for management and conservation of coral reef ecosystems.
Redefining Dispersal Boundaries of Siganus fuscescens In The Coral Triangle Area Ni Putu Dian Pertiwi; Nur Ismu Hidayat; Chloe Henderson; I Nyoman Giri Putra; Andrianus Sembiring
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 24, No 1 (2019): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (690.59 KB) | DOI: 10.14710/ik.ijms.24.1.31-40

Abstract

The increasing demand of fish in the Coral Triangle Area has led to overexploitation of some species of fishes. One of the commercial fishes, which is also known to be the source of food and income for local communities, is the Mottled Spinefoot (Siganus fuscescens). Population studies on this species are important in order to manage sustainable stock populations. Genetic variation of the mitochondrial DNA was analyzed to examine the population structure of Siganus fuscescens in Indonesia, as part of the Coral Triangle Area. In total, 789 basepairs of control region mtDNA sequences were determined from 133 specimens collected from six localities, including Seribu Islands (n=27), Karimunjawa (n=19), Komodo (n=39), Selayar (n=20), Lembeh (n=19) and Luwuk (n=9). From the data, 27 variable sites and 24 haplotypes were detected, with most of the haplotypes unique to each location. Haplotype data show that one haplotype was shared among all populations, three haplotypes were shared between two populations (Komodo & Selayar; Lembeh & Seribu; Komodo & Karimunjawa), and 20 were unique to a single population. Haplotype diversity (h=0.444) and nucleotide diversity (π=0.00165) were low. The diversity result, i.e. the ΦST value (0.0658, P < 0.0001) revealed genetic structure in S. fuscescens populations in Indonesia. A non-dispersal strategy led to restricted gene flow and genetic structuring in S. fuscescens. However, both the neutrality test and the mismatch distribution indicated that S. fuscescens might have been in populations at demographic equilibrium, with restriction to the population expansion. Although indicating unexpected minor population structure pattern, the overall result still suggest the management of this species population as a single unit across Indonesia.
Co-Authors Aji Wahyu Anggoro Ambariyanto Ambariyanto Chloe Henderson Christopher P. Meyer Diah Permata Wijayanti Eka Maya Kurniasih Muhammad Dailami Ni Kadek Dita Cahyani Ni Putu Dian Pertiwi Nur Ismu Hidayat Putra, I Nyoman Giri