Coastal and Marine Journal

The Density of Megabentos in Coral Reef Ecosystems in The Waters of Pongok Island, South Bangka District

Citra Ayu — 2024-06-04

Biota plays a role in reef coral is megabenthos . Megabenthos is a large benthic biota more of 1cm and has Power adaptation to condition environment . Benthic biota usually found at the bottom waters like ecosystem reef coral and fields seagrass . Waters Island Pongok own diversity biological abundant sea _ so that made source search society in general working as a fisherman with method netting, fishing and doing arrest with another way . Apart from that, some fisherman Still use tool catch those who don't friendly environment like use bomb and shoot For catching fish. Megabenthos data collection use method Benthos Belt Transect and reef data collection coral use method Underwater Photo Transect . Research results in Water Island Pongok 12 species were found of the 6 families found in the waters Island Pongok . Density value megabenthos found _ range between 0.007-1.257 ( ind /m²) which is dominated by species Diadem setosum with average value _ amounted to 0.688 ( ind /m²), whereas density Lowest is in the species Drupella cornus , Linckia multifora and Trochus niloticus with the average value density 0.002 ( ind /m²). Percentage cover reef coral live on the Island Pongok ranges between 28.67%-63.87% in Medium to Good category . Analysis results Principal Component Analysis (PCA) was obtained results density highest that is Correlated diadema _ with temperature with mark the correlation is 1,000 and temperature namely 0.825, next clams correlated with pH and value the correlation is 0.465 and pH 0.982. From these two biota categorized as correlated perfect with physical and chemical parameters waters. Connection density megabenthos with form growth reef coral density megabenthos highest at the location study is species Diadem sp . which is correlated tall with Dead Coral Algae (DCA) with mark the correlation is 0.998. Density megabenthos Lowest is Correlated Drupella _ tall with Dead Coral Algae (DCA) with mark the correlation is 0.998, and Linckia multifora correlated tall with Coral Foliose (CF) with mark the correlation is 0.925.

The Macrozoobenthos Community Structure on Artificial Reef at Penyusuk Marine, Bangka Regency

Dia Aldia — 2024-06-04

Makrozoobenthos are all types of sedentary organisms or move freely whose habitat’s in the bottom substrate of waters with a body size of more than equal to 0.5 mm. Benthos have a very important role in waters where macrozoobenthos communities must remain balanced so that aquatic ecosystems are balanced. This study aims to determine the type of macrozoobenthos, the abundance of macrozoobenthos and the structure of macrozoobenthos communities on artificial reefs in Penyusuk Marine, Bangka Regency which was sunk by PT. Arta Cipta Langgeng. Data collection will be carried out in May 2023 at an artificial reef in Penyusuk Marine, Bangka Regency. The determination of the research location point was carried out by purposive sampling and macrozoobenthos data collection using road sampling techniques and free hand picking methods. Measurement of environmental parameters was carried out in situ and ex situ as well as data analysis using Principal Component Analysis (PCA). The results of the study found 32 types of macrozoobenthos with a total of 2,745 individuals found at the three observation stations. The abundance obtained ranged from 46,04 ind/m2 – 49,01 ind/m2. The diversity value ranges from 0,60 – 0,87 so that was categorized as low, the uniformity value ranges from 0,19 – 0,27 as low was categorized and the dominance value ranges from 0,72 – 0,82 was high categorized.

The Study of Coral Recruitment on Artificial Reefs in The Coastal Waters of Penyusuk, Bangka District

Eka Maulana — 2024-06-04

Artificial coral reefs are one of the efforts to rehabilitate resources and serve as a nursery area, providing a permanent new habitat for sessile biota and maintaining the balance of the food chain cycle. This study aims to identify the types of coral attached to artificial reefs and analyze the coral density value on artificial reefs in the waters of Penyusuk Belinyu, Bangka District. Data collection was conducted by counting the number of individuals of coral genera and their sizes visible through the visual census method. The corals found consist of 3 families and 3 genera of coral: the Subergorgiidae family with the Subergorgia genus, the Carijoidae family with the Carijoa genus, and the Faviidae family with the Favia genus, with a total of 136 individuals found in three observation stations. The coral density values for the 3 stations range between; Subergorgia (0.104-0.677 ind/m2), Carijoa (0.677-1.563 ind/m2), and Favia (0.781-1.146 ind/m2). Environmental parameters affecting coral larval settlement include water flow rate, Total Suspended Solids (TSS), temperature, salinity, brightness, and pH.

The Coral Reef Health Disturbance in The Waters of Pongok Island, South Bangka District

Muhammad Firmansyah — 2024-06-04

This research aims to analyze coral reef cover and analyze coral reef health problems. This research was conducted in October 2023 in the waters of Pongok Island. Coral reef cover data collection using the method of Underwater Photo Transect (UPT) and data collection on the distribution of coral health disorders was taken using the belt transect method (belt transect). The results of the research showed that the percentage of coral reef cover in Pongok Island waters ranged from 28.67% - 63.87% which was categorized as Medium to Good. Coral reef health problems found at the research location in Pongok Island waters are Bleaching (B), Sedimentation damage (SD), Pigmentation response (PR), growth anomalies (GA), and crown of thorns starfish (CoTS). Sedimentation damage is the highest prevalence in the research location with 3.42%, then pigmentation response (PR) with a total of 0.48%, Crown of thorns starfish (CoTS) 0,05%, Bleaching (B) 0,04%, and Growth anomalies (GA) with an amount of 0.01%.