Sea Urchin (Echinoidea) Distribution and Abundance in the Intertidal Zone of Bengkayang Regency

Andi Ristanto,Tri Rima Setyawati,Ari Hepi Yanti

doi:10.15294/biosaintifika.v10i1.9763

Andi Ristanto, Tri Rima Setyawati + Show 1 more

Open Access

https://doi.org/10.15294/biosaintifika.v10i1.9763

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Abstract

Sea urchins is the member of Echinoidea. This species can be found in tropical marine water to the poles. The study aimed to know the types, the abundance and spread of sea urchins in Bengkayang Regency. The research, used the transect method. Each station consisted of 3 transects with a length of 50 meters from the shore into the sea with the distance of 10 meters among the transects. This research obtained five species consisting of three species of the Diadema (genus) and two species of the Echinotrix (genus) i.e. Diadema antillarium, D. savignyi, D. setosum, Echinotrix calamaris and E. deadema. The density of sea urchins in Lemukutan Island ranges from 273 – 453 ind/Ha. The Density of sea urchins on Penata Kecil island ranges from 167 - 347 ind / Ha and on Penata Besar Island has a range from 307 - 387 ind/Ha. The highest diversity of sea urchins was found in Penata Kecil Island of (1.2355). The distribution of sea urchins in Lemukutan and Penata Besar Island was categorized into clumped and evenly distributed, while the distribution of sea urchin on Penata Kecil Island is included in the clustered and random categories. Distribution of sea urchins on the island is influenced by several factors such as sea water waves and food contained in the environment.

Highlights

West Kalimantan is a province that has the highest potential population of sea urchins, it can be discovered in Lemukutan, Penata Besar and Penata Kecil Island
Time and Place The study was conducted from May - July, 2015 in intertidal zone of Lemukutan, Penata Besar and Penata Kecil Island of Bengkayang Re-The sea urchins found in the intertidal waters of Penata Kecil, Penata Besar and Lemukutan Island were 5 species, comprising 3 species of the Diadema and 2 species of the Echi
The results showed that the density of sea urchins in each island is different

Summary

INTRODUCTION

West Kalimantan is a province that has the highest potential population of sea urchins, it can be discovered in Lemukutan, Penata Besar and Penata Kecil Island. Sea urchin plays an important role in a food chain in the coast, especially in coral reef ecosystems. This animal can be found from tropical waters to poles. The study of the existence of sea urchin should be done especially regarding the distribution and abundance of sea urchin species in Lemukutan, Penata Besar and Penata Kecil Island of Bengkayang Districts. This research is expected to provide information to the public and stakeholders about the existence of sea urchins in the area of intertidal waters on Lemukutan, Penata Besar and Penata Kecil Island of Bengkayang Regency. Data analysis Data analysis included Density (K), Relative Density (KR), Attendance Frequency (FK), Diversity Index (H’), Evenness Index (E), Dominance Index (C) and Morisita Index (IM)

RESULTS AND DISCUSSION

Findings

CONCLUSION