Propagule pressure and persistence in experimental populations
- 31 August 2005
- journal article
- Published by The Royal Society in Biology Letters
- Vol. 1 (4), 480-483
- https://doi.org/10.1098/rsbl.2005.0375
Abstract
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.Keywords
This publication has 29 references indexed in Scilit:
- Density-Dependent Demographic Variation Determines Extinction Rate of Experimental PopulationsPLoS Biology, 2005
- Founder population size and number of source populations enhance colonization success in waterstridersOecologia, 2003
- Effects of environmental variation on extinction and establishmentEcology Letters, 2003
- Fluctuating resources in plant communities: a general theory of invasibilityJournal of Ecology, 2000
- Metapopulation Models: The Rescue Effect, the Propagule Rain, and the Core-Satellite HypothesisThe American Naturalist, 1991
- Bank Vole [Clethrionomys glareolus (Schreber, 1780)] Propagules of Different Sizes and Island ColonizationJournal of Biogeography, 1989
- Annual Experimental Evaluation of the Effect of Invasion History on Community StructureEcology, 1988
- Does Invasion Sequence Affect Community Structure?Ecology, 1987
- The island dilemma: Lessons of modern biogeographic studies for the design of natural reservesBiological Conservation, 1975
- Experimental Zoogeography: Introductions of Mice to Small IslandsThe American Naturalist, 1973