Accumulation of NH4+ and NO3− inside Biofilms of Natural Microbial Consortia: Implication on Nutrients Seasonal Dynamic in Aquatic Ecosystems. (2nd June 2019)

• Record Type: Journal Article
• Authors: Kurniawan, Andi; Yamamoto, Tatsuya
• Other Names: Iglewski Barbara H. Academic Editor.
• Is Part Of: International journal of microbiology. Volume 2019(2019)
• Publication Date: 2019-06-02
• Subjects: Microbiology -- Periodicals; Microbiology; Microbiology -- Periodicals; Electronic journals; Periodicals; 579
• DOI: 10.1155/2019/6473690
• Languages: English
• ISSNs: 1687-918X

Abstract

Abstract : Microbial biofilms are ubiquitous in aquatic ecosystems. Inside the biofilm is the nutrient-rich microenvironment promoted by the accumulation of the nutrient ions such asNH 4 + andNO 3 − from surrounding water. The present study investigated the characteristics ofNH 4 + andNO 3 − accumulation into the biofilm of natural microbial consortia collected from Lake Biwa, Japan. The results showed the following: (1) the concentrations ofNH 4 + andNO 3 − inside the biofilm were much higher than those in the surrounding water; (2) the nutrient ion concentration inside the biofilm changed in synchrony with those in the surrounding water; (3) biofilm polymers have both positively and negatively charged sites; (4) electrostatic attractive interactions between the charged sites on biofilm polymers and oppositely charged ions outside the biofilm seem to play important roles in the accumulation of nutrient ions into the biofilm from the surrounding water; (5) the bacterial community structure differs between the biofilm and surrounding water. The present study revealed that the accumulation of nutrient ions into the biofilm indicates the removal of these ions from water outside the biofilm. According to the result of this study, accumulation of ions such asNH 4 + andNO 3 − into the biofilm of natural microbial consortia may have implications on nutrients seasonal dynamic in aquatic ecosystems.