Document Detail

Propagule pressure and persistence in experimental populations.
MedLine Citation:
PMID:  17148238     Owner:  NLM     Status:  MEDLINE    
Average inoculum size and number of introductions are known to have positive effects on population persistence. However, whether these factors affect persistence independently or interact is unknown. We conducted a two-factor experiment in which 112 populations of parthenogenetic Daphnia magna were maintained for 41 days to study effects of inoculum size and introduction frequency on: (i) population growth, (ii) population persistence and (iii) time-to-extinction. We found that the interaction of inoculum size and introduction frequency-the immigration rate-affected all three dependent variables, while population growth was additionally affected by introduction frequency. We conclude that for this system the most important aspect of propagule pressure is immigration rate, with relatively minor additional effects of introduction frequency and negligible effects of inoculum size.
John M Drake; Peter Baggenstos; David M Lodge
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Biology letters     Volume:  1     ISSN:  1744-9561     ISO Abbreviation:  Biol. Lett.     Publication Date:  2005 Dec 
Date Detail:
Created Date:  2006-12-06     Completed Date:  2007-02-06     Revised Date:  2013-06-06    
Medline Journal Info:
Nlm Unique ID:  101247722     Medline TA:  Biol Lett     Country:  England    
Other Details:
Languages:  eng     Pagination:  480-3     Citation Subset:  IM    
Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA.
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MeSH Terms
Daphnia / physiology*
Population Density
Population Dynamics
Population Growth
Reproduction, Asexual*
Time Factors

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