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Local and Regional Determinants of Colonisation- Extinction Dynamics of a Riparian Mainland-Island Root Vole Metapopulation

Glorvigen, Petter; Andreassen, Harry Peter; Ims, Rolf A.
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/134512
Date
2013
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  • Artikkel - fagfellevurdert vitenskapelig / Articles - peer-reviewed [1618]
Original version
Glorvigen P, Andreassen HP, Ims RA (2013) Local and Regional Determinants of Colonisation-Extinction Dynamics of a Riparian Mainland-Island Root Vole Metapopulation. PLoS ONE 8(2): e56462. doi:10.1371/journal.pone.0056462   10.1371/journal.pone.0056462
Abstract
The role of local habitat geometry (habitat area and isolation) in predicting species distribution has become an increasingly

more important issue, because habitat loss and fragmentation cause species range contraction and extinction. However, it

has also become clear that other factors, in particular regional factors (environmental stochasticity and regional population

dynamics), should be taken into account when predicting colonisation and extinction. In a live trapping study of a mainlandisland

metapopulation of the root vole (Microtus oeconomus) we found extensive occupancy dynamics across 15 riparian

islands, but yet an overall balance between colonisation and extinction over 4 years. The 54 live trapping surveys conducted

over 13 seasons revealed imperfect detection and proxies of population density had to be included in robust design, multiseason

occupancy models to achieve unbiased rate estimates. Island colonisation probability was parsimoniously predicted

by the multi-annual density fluctuations of the regional mainland population and local island habitat quality, while

extinction probability was predicted by island population density and the level of the recent flooding events (the latter

being the main regionalized disturbance regime in the study system). Island size and isolation had no additional predictive

power and thus such local geometric habitat characteristics may be overrated as predictors of vole habitat occupancy

relative to measures of local habitat quality. Our results suggest also that dynamic features of the larger region and/or the

metapopulation as a whole, owing to spatially correlated environmental stochasticity and/or biotic interactions, may rule

the colonisation – extinction dynamics of boreal vole metapopulations. Due to high capacities for dispersal and habitat

tracking voles originating from large source populations can rapidly colonise remote and small high quality habitat patches

and re-establish populations that have gone extinct due to demographic (small population size) and environmental

stochasticity (e.g. extreme climate events).
Publisher
Plos One
Journal
PLOS one

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