English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Comparative demographic impacts of ''info-chemicals'' and exploitative competition: an empirical test using Daphnia magna

Mitchell, S. E., & Carvalho, G. R. (2002). Comparative demographic impacts of ''info-chemicals'' and exploitative competition: an empirical test using Daphnia magna. Freshwater Biology, 47(3), 459-471.

Item is

Files

show Files
hide Files
:
mitchell_2002.pdf (Publisher version), 246KB
 
File Permalink:
-
Name:
mitchell_2002.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:
Mitchell, S. E.1, Author           
Carvalho, G. R., Author
Affiliations:
1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              

Content

show
hide
Free keywords: crowding info-chemicals; diversity; kairomones; life-history traits; population dynamics
 Abstract: 1. Crowding ''info-chemicals'', metabolites released into the environment that act as signals to conspecifics as well as other organisms, have often been shown to cause phenotypic plasticity in cladoceran life-history traits including morphology, reproductive strategy and sex induction. Effects on population demography and diversity, however, have not been examined directly. 2. Replicate laboratory populations of the zooplankter, Daphnia magna, were started with 250 juveniles and allowed to develop for 8 weeks in 10 L flow-through aquaria with food levels of 1 mg CL-1. Two crowded water treatments from different clonal sources were compared with untreated water as a control. 3. The presence of crowding chemicals affected initial population structure, through reduction in parthenogenetic female body lengths, brood sizes and juvenile densities. However, the timing of population density maxima and subsequent population structure, clonal composition and diversity were similar among all treatments. 4. Clonal richness remained slightly higher in untreated populations because of increased prevalence of rare clones. 5. Exploitation competition had greater impact on population structure than the relative concentration of crowding chemicals, indicating that density dependent effects were mediated primarily by competition for common resources. 6. Crowding info-chemicals may play a greater role in community structure than in single species population structure because of taxonomic diversity in species'' response that may be unrelated to the source species density.

Details

show
hide
Language(s): eng - English
 Dates: 2002-03
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 3970
ISI: 000174308400010
Other: 2112/S 37824
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Freshwater Biology
  Alternative Title : Freshw. Biol.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 47 (3) Sequence Number: - Start / End Page: 459 - 471 Identifier: ISSN: 0046-5070