Tropic Status Assesment in Segara Anakan Lagoon, Indonesia : Experience in Applying the Trophic Index Trix

1st International Conference on Life and Applied Sciences for Sustainable Rural Development

生态环境科学

Dewi, Rose^1^2 ; Zainuri, Muhammad^3^4 ; Anggoro, Sutrisno^2 ; Winanto, Tjahjo^1 ; Endrawati, Hadi^5 ; Hadisusanto, Suwarno^6 ; Sabdono, Agus^5 ; Haeruddin^2 ; Muskananfola, Max Rudolf^2 ; Nugroho, Denny^5

Fisheries and Marine Science Department, Jenderal Soedirman University, Indonesia^1

Coastal Resources Management Doctoral Program, Fisheries and Marine Science Department, Diponegoro University, Indonesia^2

Department of Oceanography, Fisheries and Marine Science Department, Diponegoro University, Indonesia^3

Centre of Excellent Mitigation of Natural Disaster and Coastal Rehabilitation, Diponegoro University, Indonesia^4

Fisheries and Marine Science Department, Diponegoro University, Indonesia^5

Faculty of Biology, Gadjah Mada University, Indonesia^6

关键词: Anthropogenic activity;    Anthropogenic pressures;    Assesment;    Index TRIX;    Macronutrient;    Management strategies;    Segara Anakan Lagoon;    Spatio-temporal approach;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/255/1/012032/pdf
DOI  :  10.1088/1755-1315/255/1/012032

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Segara Anakan is a large lagoon, located along the southern coast on western part of Central Java, Indonesia 108° 46'-109° 05'E; 7° 34'-7° 48'S. It has an important ecosystem role as a nursery ground, so that it is important to have further study of the primary productivity. The human activities around the area and natural factors sedimentation has changed the inrush input to the lagoon. Feared, it will influence the change in tropic status of the lagoon, and will cause the average degradation of the primary productivity value. The aim of the research is to explore the study of the primary productivity in Segara Anakan lagoon (SAL) with tropic status assesment. Index TRIX has been used for evaluating long-term trend and spatial trophic pattern in the lagoon with linear combination of the log of 4 state variables: chlorophyll-a, aD%O, macronutrient : Total Nitrogen (TN) and Total phospat (TP). The main objective of this study is to estimating tropic status with spatio-temporal approach. The spatial approach is done on 7 stations (S) with representations: (S) natural factors and (S) the presence of anthropogenic activities. The temporal approach (time series) for a year refers to the monsoon wind pattern (west, transition I, east and transition II) season. The results of laboratory tests are discussed descriptively. Index TRIX assesment in SAL shows that point values, exceeding 6 TRIX units are typical of highly productive coastal waters, where the effects of eutrophication determine frequent episodes of anoxia in bottom waters and indicated by high Habs phytoplankton. The effects of highest rainfall at transition II season, anthropogenic pressure, aquatic hydrodynamics are thought to cause in the increasing of SAL macronutrients which trigger eutrophication of waters. Management and lagoon management strategies are required by the local government, stakeholders and communities to prevent the phenomenon of eutrophication of the lagoon.