Hubungan Kerapatan Lamun dengan Kelimpahan Bakteri Heterotrof di Perairan Pantai Kartini Kabupaten Jepara

Abstract

The coastal waters of Kartini is one of the coast located in Central Java, Kabupaten of Jepara. Seagrass at the coastal waters dominated by Thalassia sp. As seagrass as a primary producer and the first trophic level organism in the food chain is usually feed by herbivores but it is mostly used by detritus. One of the more important detritus in the ecosystem are the heterothropic bacterias who function as a decomposer. This is why it is important to figure out the correlation between the density of seagrass with the amount of heterothropic bacterias in the waters at the coast of Kartini in Jepara. The purpose of this study is to know the density of seagrass in the waters at the coast of Kartini Kabupaten Jepara, to know the investigate of heterothropic bacterias on Seagrass in the waters at the coast of Kartini Kabupaten Jepara and to analyse the correlation between the density of seagrass with the amount of heterothropic bacterias in the waters at the coast of Kartini Kabupaten Jepara. Materials used for this research are seagrass and samples of seagrass leaves. This research has been conducted in Februari to March 2016. The method used is a descriptive method with purposive sampling. The results obtained were the density of seagrass in the waters at the coast of Kartini was an average of 67 sprouts of seagrass/m2, with the highest density of 102 sprouts of seagrass/m2 and the lowest density of 29 sprouts of seagrass/m2.The total amount of heterothropic bacterias on seagrass in the waters at the coast of Kartini kabupaten Jepara was found at the most of 173333 x 104 upk/ml (diluted at 104) and at the least of 33333 x 104 upk/ml. Density of seagrass has a strong correlation with the amount of heterothropic bacterias in the waters at the coast of Kartini Kabupaten Jepara with a correlation coefficient high than 0,600 (r = 0,618). The amount of bacterias are influenced by the density of seagrass, the higher the density will also increase the amount of heterotrophic bacterias