Abstract
Lapindo hot mud to overflow and flood the east coast of Sidoarjo for 9 years has causedchanges in environmental factors, particularly aquatic ecosystems environment. This has an impact onbiodiversity of aquatic ecosystems in the eastern coastal Sidoarjo. This study aims to determine the quality ofaquatic ecosystems on the east coast of Sidoarjo contaminated by Lapindo hot mud and the impact onbiodiversity of aquatic organism. Data taken from 5 station consists of wetlands ecosystems, river, brackishwater ponds, estuaries, and coastal covering area districts of Porong, Jabon, Tanggulangin, and Sidoarjo, EastJava, Indonesia. Determination of stations and substations did purposively based on distribution mapsLapindo hot mud. Data obtained in the form of physical and chemical parameters of waters, biodiversity ofaquatic organism analyzed descriptively and quantitatively, and compared as well as the quality standard.The results showed contamination of aquatic ecosystems by Lapindo hot mud has led to changesenvironment factors and declining biodiversity of the aquatic organism in the eastern coastal of Sidoarjo.
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