緩速ろ過池の砂層に生息するユスリカ幼虫と随伴する細菌群集の役割

URI http://harp.lib.hiroshima-u.ac.jp/kure-nct/metadata/9534
File
Title
緩速ろ過池の砂層に生息するユスリカ幼虫と随伴する細菌群集の役割
Title Alternative
Possible Roles of Midge Larvae and the Associated Bacteria Inhabiting Slow Sand Filter Beds
Author
氏名 竹内 準一
ヨミ タケウチ ジュンイチ
別名 Takeuchi Juni
氏名 鈴藤 真也
ヨミ スズトウ シンヤ
別名 Suzutoh Shinya
Subject
gut flora
internal colonizers
faecal pellets
UV-irradiation
hydrolyses
腸内細菌相
内在菌
糞塊
紫外線照射
加水分解
Abstract

Bacteria in the gut of midge larvae (Diptera, Chironomidae) living in the uppermost layer of the beds of slow sand filters (Hirabara works, Kure, Hiroshima) were isolated and characterized by their hydrolysis enzymatic activities against starch, casein and tributyrin, as compared with two other samples such as the surrounding sand beds and overlying water. Higher frequency (about 80%) of the isolates from the sand bed had hydrolytic activities against the substrates. This suggests that the midge larvae constantly produce faecal pellets which contain a number of bacteria having hydrolytic enzymes as a result of their grazing and excreting behaviours. Lower frequencies of those from the gut may be due to difficulty in culturing strictly anaerobes. The midge larvae and their faecal pellets are not accepted as unhygienic but beneficial factor, thus conditioning the sand beds to supply us with safe and more natural-tasty drinking water.

Journal Title
呉工業高等専門学校研究報告
Issue
73
Spage
19
Epage
24
Published Date
2011
Publisher
呉工業高等専門学校
ISSN
0286-4037
Language
jpn
NIIType
Departmental Bulletin Paper
Text Version
出版社版
Old URI
Set
kure-nct