English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Probing the microenvironment of freshwater sediment macrofauna: Implications of deposit-feeding and bioirrigation for nitrogen cycling

Stief, P., & de Beer, D. (2006). Probing the microenvironment of freshwater sediment macrofauna: Implications of deposit-feeding and bioirrigation for nitrogen cycling. Limnology and Oceanography, 51(6), 2538-2548.

Item is

Files

show Files
hide Files
:
Stief6.pdf (Publisher version), 833KB
Name:
Stief6.pdf
Description:
-
OA-Status:
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Stief, P.1, Author           
de Beer, D.1, Author           
Affiliations:
1Permanent Research Group Microsensor, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481711              

Content

show
hide
Free keywords: -
 Abstract: The effect of sediment‐dwelling macrofauna on nitrifying bacteria was investigated by direct probing in their overlapping habitat, i.e., the upper few millimeters of freshwater sediments. Microsensors (O2, NH4+, NO3‐, and diffusivity) were used at the sediment surface and inside animal burrows to record steady‐state and dynamic distributions of reactants, respectively. Short‐term changes of metabolic activity (actual and potential nitrification rates) and long‐term changes of abundance (fluorescence in situ hybridization) of nitrifying bacteria were determined. The presence of insect larvae (Chironomus riparius) increased the availability of O2 and NO3‐ in the sediment pore water and inside animal burrows, suggesting promotion of nitrification and dissimilatory NO3‐ reduction, particularly in the burrowing layer of C. riparius. At the sediment surface (i.e., in the feeding layer of C. riparius), however, nitrification was inhibited by low NH4+ availability and high macrofaunal grazing pressure. Consequently, both actual and potential nitrification rates decreased in the feeding layer. Inside burrows, no net nitrification was detected, despite high NH4+ availability and frequent O2 injections by larval ventilation activity. Conversely, burrows were sites of NH4+ production and consumption. Nevertheless, the abundance of nitrifying bacteria increased measurably in the burrowing layer after prolonged incubation, but only in sediments in which the larvae were able to construct and ventilate stable burrows.

Details

show
hide
Language(s): eng - English
 Dates: 2006-11-15
 Publication Status: Issued
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 305562
ISI: 000242265700005
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Limnology and Oceanography
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Waco, Tex., etc. : American Society of Limnology and Oceanography.
Pages: - Volume / Issue: 51 (6) Sequence Number: - Start / End Page: 2538 - 2548 Identifier: ISSN: 0024-3590
CoNE: https://pure.mpg.de/cone/journals/resource/954925421091