Struktur Komunitas Nekton di Perairan Danau Siombak Kecamatan Medan Marelan Kota Medan

Abstract

Siombak Lake is an artificial lake formed as a result of sand dredging activity in an area formerly known as Sand Paya and the lake is also influenced by the tides due to the location of the lake is not far from the coastal region. Siombak Lakes ecosystem stability can be in the review of information about the structure of nekton communities that live in the lake Siombak. Biological resources in the region have an important role in order to function naturally Siombak lake can be maintained. This study aims to determine the physical and chemical conditions in the Lake Siombak and to determine the structure of nekton community. This study uses primary data obtained from the results of sampling from May to July 2014. The data is data nekton species composition and abundance, as well as water quality data as a supporter. Data were analyzed with a diversity index, uniformity index, dominance index, and Pearson correlation analysis method. The results showed there were 7 of the Ordo, of which 6 ordo of fish and 1 ordo of types of shrimp. Fish Slinding (Ambassis uroatenia) is a fish that is caught at most in the amount of 237 birds and 64% relative abundance. Diversity nekton in Lake Siombak including being (to be in the range of 1 to 3) that is equal to 1.07. General dominance index values approaching 0 is 0.54. It shows that almost no species dominates. Value uniformity tends approaching 0 is equal to 0.48. The figure shows the spread of the number of individuals of each type is not the same. Siombak polluted lake water conditions are, the waters of Lake Siombak can be allocated to infrastructure/water recreation facilities, freshwater fish farming, animal husbandry, water to irrigate landscaping, and or other designation similar to these purposes. In accordance with the results of the Pearson Correlation Analysis. Pearson correlation analysis showed that temperature, turbidity, pH and BOD5 have a negative correlation or have a relationship that is not in line with the diversity nekton while salinity, DO, brightness and depth has a positive correlation or have the unidirectional relationship with Nekton.