English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Structuring of epilithic biofilms by the caddisfly Tinodes rostocki: photosynthetic activity and photopigment distribution in and beside larval retreats

Stief, P., & Becker, G. (2005). Structuring of epilithic biofilms by the caddisfly Tinodes rostocki: photosynthetic activity and photopigment distribution in and beside larval retreats. Aquatic Microbial Ecology, 38(1), 71-79.

Item is

Files

show Files
hide Files
:
LFS1057_2005StiefBecker.pdf (Publisher version), 462KB
 
File Permalink:
-
Name:
LFS1057_2005StiefBecker.pdf
Description:
-
OA-Status:
Visibility:
Restricted (Max Planck Institute for Evolutionary Biology, MPLM; )
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Stief, Peter1, Author           
Becker, Georg1, Author           
Affiliations:
1Limnological River Station Schlitz, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976546              

Content

show
hide
Free keywords: Stream; Epilithic biofilm; Microalgae; Photosynthesis; Trichoptera; Grazing; Microsensors; Photopigments
 Abstract: Tinodes rostocki larvae (Trichoptera: Psychomyiidae) cover large proportions of stream hard substrata with retreats constructed of mineral particles and larval silk. We consider these retreats as 3-dimensional extensions of the epilithic biofilm that may possess a distinct microenvironment, community metabolism and composition. Therefore, we compared the photosynthetic/respiratory activities (O₂ and pH microsensors) and the photopigment composition (HPLC) of larval retreats and the surrounding epilithic biofilms. In retreats, pigment contents and photosynthetic/respiratory activities were highest in sections with a visible microphytobenthic biofilm that were mostly the older parts of the retreats. In contrast, newly constructed sections of the retreats and the surrounding epilithic biofilm had approximately 5-fold lower values. The fucoxanthin-to-chlorophyll ratio of the retreat biofilm was high (fuco/chl a = 1.27) and indicated diatom dominance, which was not evident in the surrounding epilithic biofilm (fuco/chl a = 0.15). Experimental transplantation of larval retreats to microscope slides allowed microsensor measurements through the 500 to 700 µm-thick wall and inside the lumen. In the light, O₂ concentration and pH values increased significantly across the wall and remained high in the lumen of the retreat, whereas in darkness O2 and pH depressions in both wall and lumen were moderate or even absent. Our data suggest that T. rostocki larvae construct and maintain retreats with a particular physico-chemical microenvironment that favours a distinct microbial community. Thereby, abundant T. rostocki larvae might significantly influence benthic primary production and heterotrophic metabolism in small streams.

Details

show
hide
Language(s): eng - English
 Dates: 2005-01-21
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 207122
Other: 1057
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Aquatic Microbial Ecology
  Alternative Title : Aquat. Microb. Ecol.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 38 (1) Sequence Number: - Start / End Page: 71 - 79 Identifier: ISSN: 16161564
ISSN: 09483055