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Rose Dewi
Marine Science Study Program, Faculty of Fisheries and Marine Sciences, Jenderal Soedirman University
Agriculture, Biological Sciences & Forestry

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PHYTOPLANKTON COMMUNITY STRUCTURE IN THE EAST PLAWANGAN OF SEGARA ANAKAN, CILACAP Dimas Setiawan; Rose Dewi; Nuning Vita Hidayati; Any Kurniawati
Jurnal Perikanan Unram Vol 14 No 2 (2024): JURNAL PERIKANAN
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jp.v14i2.878

Abstract

The East Plawangan waters of Laguna Segara Anakan (LSA), Cilacap are unique waters that are characterized by high biodiversity and are a meeting place for several rivers. It is thought that anthropogenic activities around waters will cause changes in ecological conditions. The organisms that first respond to these changes are phytoplankton. The aim of this research is to determine the structure of the phytoplankton community which includes abundance, diversity index, evenness index and dominance index, as well as to determine physical-chemical factors and the relationship between phytoplankton abundance and physical-chemical factors. The method used is a survey method with Purposive Random Sampling at 5 stations. The f test and Lackey Drop Microtransect Counting method were used to determine the abundance of phytoplankton. Principal Component Analysis (PCA) was used to determine the relationship between phytoplankton abundance and physical-chemical factors. The results showed that the abundance of phytoplankton was in the low and medium categories with values of 840 ± 435 to 3814 ± 939 ind/L; The diversity index ranged from 2.42 - 2.99 (medium); The phytoplankton evenness index ranges between 0.74 - 0.89 (high) and the phytoplankton dominance index ranges from 0.06 - 0.14 (low). Physical-chemical factors in East Plawangan are still at the threshold that can be tolerated by phytoplankton. PCA analysis showed a relationship between phytoplankton abundance and physical-chemical factors as indicated by two main factors (F1 and F2) which produced a variance value of 87.49% with the most influencing factor being orthophosphate.
RELATIONSHIP BETWEEN ECOLOGICAL FACTORS AND CAROTENOID CONTENT IN Gracilaria sp. IN THE SILVOFISHERY OF THE NORTH COAST OF CENTRAL JAVA Swietenia Purnamasari; Rose Dewi; Tjahjo Winanto
Vol 15 No 6 (2025): JURNAL PERIKANAN
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jp.v15i6.2007

Abstract

Gracilaria sp. is a seaweed with high economic value and is able to produce natural pigments in the form of carotenoids. The purpose of this study was to determine the value of the carotenoid content of Gracilaria sp., to determine the ecological conditions (physicochemical) of the water and to determine the relationship between these measurement variables. The method used was a survey method with a spatial approach (4 stations) and temporal (4 seasons). For the carotenoid variable, Gracilaria sp. was measured using a UV-Vis 1800V spectrophotometer. This study used Principal Component Analysis to determine the relationship between ecological factors and the carotenoid content of Gracilaria sp. The carotenoid content obtained spatially ranged from 14.03-31.10 mg/L and temporally 3.86-35.52 mg/L. The ecological conditions of the silvofishery area spatio-temporally have conditions that can be tolerated for the formation of carotenoids. The relationship between carotenoid content and ecological factors spatially produces an eigenvalue of 84.82% with F1 60.82% and F2 24.00%, with characteristics influenced by anthropogenic. Temporally produces an eigenvalue of 80.26% with F1 42.50% and F2 37.76%, with characteristics influenced by rainfall.
Co-Authors Any Kurniawati Dimas Setiawan Nuning Vita Hidayati Swietenia Purnamasari Tjahjo Winanto