Seasonal Variations in Bacterioplankton Community Structures in Two Small Rivers in the Himi Region of Central Japan and Their Relationships with Environmental Factors

Overview

Journal World J Microbiol Biotechnol

Publisher Springer

Specialties Biotechnology
Microbiology

Date 2017 Nov 15

PMID 29134451

Citations 1

Authors

Daisuke Tanaka

Toyo Takahashi

Yoko Yamashiro

Hitoshi Tanaka

Yuzuru Kimochi

Masaki Nishio

Akihiro Sakatoku

Shogo Nakamura

Affiliations

Soon will be listed here.

Abstract

The aim of this study was to improve our understanding of seasonal variations and the effects of physicochemical conditions on the bacterioplankton communities in two small rivers, the Moo and Nakayachi Rivers in the Himi region of central Japan. These rivers are inhabited by unionid freshwater mussels, which are used for oviposition by the endangered Itasenpara bitterling (Acheilognathus longipinnis). Water samples were collected every month between March 2011 and February 2012. Changes in bacterioplankton community structures were analysed using an approach that did not require cultivating the bacteria and involved PCR and denaturing gradient gel electrophoresis. The bacterioplankton community structures in the two rivers were similar in all seasons except winter. The bacterial sequences identified were dominated by typical freshwater Actinobacteria, Bacteroidetes, Cyanobacteria, α-Proteobacteria, and β-Proteobacteria bacterioplankton. Many β-Proteobacteria species were detected in all seasons, but Bacteroidetes species were dominant in the winter. The bacterioplankton community structures were affected by biochemical oxygen demand, chemical oxygen demand, chlorophyll-a concentration, water depth, and water temperature. These results provide a foundation for a more detailed understanding of the conditions that provide a suitable unionid habitat.

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