English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Microbiology of Central Amazon lakes

Rai, H. (1979). Microbiology of Central Amazon lakes. Amazoniana: Limnologia et Oecologia Regionalis Systematis Fluminis Amazonas, 6(4), 583-599.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0004-695C-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-695D-F
Genre: Journal Article

Files

show Files
hide Files
:
Rai_1979.pdf (Publisher version), 10MB
Name:
Rai_1979.pdf
Description:
-
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Rai, Hakumat1, Author
Affiliations:
1Department Tropical Ecology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_3148706              

Content

show
hide
Free keywords: -
 Abstract: Heterotrophic parameters of a black water lake (Lago Tupé) and four different Várzea lakes of the Janauacá region (L. Castanho, L. Muru-Murú, L. Jacaré and L. Jutaí Grande) were studied during high and low water phases. Besides heterotrophic planktonic bacterial populations, saprobic bacterial populations, chlorophyll-a content, and dissolved organic carbon concentration were determined because of their possible relationship to chemoorganotrophy. Saprobic bacterial numbers of black water lake (L. Tupé) ranged from 2.7 to 1.3 x 10^4/l and a maximum uptake velocity (Vmax) ranged from 0.09 - 9.3 pg glucose/l/h. Várzea lakes receive water from Rio Solimões have higher bacterial numbers. The saprobic bacterial varied between 4 x 10^3 - 2.2x 10^5 during high water phase and 1.1 - 9 x 10^5/l during low water phase. The maximum velocity of uptake (Vmax) for the Vârzea lakes varied between 0.039 and 0.662 pg glucose/l/h during high water phase and 1.36 - 2.944 pg glucose/h during low water phase. Comparison of kinetic data from several lakes suggests a relationship between the bacterial uptake rate of glucose and phytoplankton production. Both saprobic bacterial numbers and activity in L. Tupé may be close to the minimum recorded in the freshwater environment. In the Várzea lakes studied, the relationship between Vmax and phytoplankton biomass was quite evident (r = 0.963). The total bacterial populations of Várzea lakes were very high and ranged from 2.1 - 11.6 x 10^8/l during high water phase and 4,2 - 15.6 x 10^9/l during low water phase. The dynamics of the bacteria in the Amazon lakes is characterized by high bacterial numbers, large seasonal fluctuations, and very slow turnover times (Tt) for the available organic matter. There is a good evidence that water level fluctuations is a very important ecological parameter which regulates the microbiological productivity of aquatic ecosystem in the Central Amazon lakes. Such observations were also made earlier on the primary production of algae (SCHMIDT 1973) and on the production of floating meadows (JUNK 1970).

Details

show
hide
Language(s): eng - English
 Dates: 1979-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: -
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Amazoniana: Limnologia et Oecologia Regionalis Systematis Fluminis Amazonas
  Other : Amazoniana
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Kiel : Kommissions-Verlag W.G. Mühlau
Pages: - Volume / Issue: 6 (4) Sequence Number: - Start / End Page: 583 - 599 Identifier: ISSN: 0065-6755
CoNE: https://pure.mpg.de/cone/journals/resource/954925458030