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- Title
Dispersal, environmental forcing, and parasites combine to affect metapopulation synchrony and stability.
- Authors
Duncan, Alison B.; Gonzalez, Andrew; Kaltz, Oliver
- Abstract
Dispersal can have positive and negative effects on metapopulation stability and persistence. One prediction is that high levels of dispersal synchronize density fluctuations between subpopulations. However, little is still known about how biotic and abiotic factors combine to modify the effects of dispersal rate on synchrony and metapopulation dynamics. In a fully factorial experimental design, we investigated the combined effects of (1) dispersal, (2) parasite infection, and (3) synchrony in temperature fluctuations on subpopulation synchrony, metapopulation instability, and minimum population size, in laboratory metapopulations of the ciliate Paramecium caudatum. Metapopulations, comprising two subpopulations linked by high or low levels of dispersal, were exposed to daily fluctuations in temperature between permissive (23°C) and restrictive (5°C) conditions. Infected metapopulations started the experiment with one subpopulation uninfected, while the other was infected at a prevalence of 5% with the bacterial parasite Holospora undulata. The temperature synchrony treatment involved subpopulations within a metapopulation following the same (synchronous temperatures) or different (asynchronous temperatures) temporal sequences. Population size was tracked over the 56-day experiment. We found that subpopulation density fluctuations were synchronized by high dispersal in infected metapopulations, and by synchronous temperatures in all metapopulations. Subpopulation synchrony was positively correlated with metapopulation instability and minimum metapopulation size, highlighting the multiple consequences of our treatments for metapopulation dynamics. Our results illustrate how parasites can generate dispersal-driven synchrony in non-cycling, declining populations. This ''biotic forcing'' via a natural enemy added to the temperaturedependent environmental forcing. We therefore conclude that predictions of metapopulation persistence in natural populations require simultaneous investigation of multiple ecological and epidemiological factors.
- Subjects
PARAMECIUM caudatum; METAPOPULATION (Ecology); EPIDEMIOLOGY; SPECIES distribution; BIOLOGICAL extinction; CAULOBACTER; GEOGRAPHIC spatial analysis
- Publication
Ecology, 2015, Vol 96, Issue 1, p284
- ISSN
0012-9658
- Publication type
Article
- DOI
10.1890/14-0137.1