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Habitat connectivity buffers extinction under extreme droughts in experimental metapopulations
  • Dongbo Li,
  • Jane Memmott,
  • Chris Clements
Dongbo Li
University of Bristol

Corresponding Author:[email protected]

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Jane Memmott
University of Bristol
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Chris Clements
University of Bristol
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Connectivity maintains the spatial dynamics of metapopulations by promoting dispersal between habitat patches, potentially buffering populations and communities against continued global change. However, this function is threatened by habitats becoming increasingly fragmented, and habitat matrices becoming increasingly inhospitable, potentially reducing the resilience and persistence of populations. Yet, we lack a clear understanding of how reduced connectivity interacts with rates of environmental change to destabilise populations. Using laboratory microcosms containing metapopulations of the Collembola Folsomia candida, we investigate the impact of habitat connectivity on metapopulation persistence under a range of simulated droughts, a key stressor for this species. We manipulated both drought severity and the number of patches affected by drought across landscapes connected by either good or poor-quality corridors. We measured the time of population extinction, the maximum rate of population decline, and the variability of abundance among patches as criteria to evaluate the persistence ability of metapopulations. We show that whilst drought severity and number of drought-affected patches negatively influenced population persistence, these results were mitigated by increased habitat connectivity, which increased population persistence time and decreased both how fast populations declined and the variability in abundance among patches. Our results suggest that enhancing spatial connectivity can increase the persistence of metapopulations, increasing the time available for conservation actions to take effect, and/or for species to adapt or move in the face of continued stress. Given that fragmentation increases the isolation of habitats, improving habitat connectivity by using good quality corridors may provide a useful strategy to enhance the resistance of spatially structured populations.
19 Jan 2023Submitted to Ecology and Evolution
20 Jan 2023Submission Checks Completed
20 Jan 2023Assigned to Editor
29 Jan 2023Reviewer(s) Assigned
16 Feb 2023Review(s) Completed, Editorial Evaluation Pending
20 Feb 2023Editorial Decision: Revise Minor
26 Apr 20231st Revision Received
27 Apr 2023Submission Checks Completed
27 Apr 2023Assigned to Editor
27 Apr 2023Review(s) Completed, Editorial Evaluation Pending
27 Apr 2023Reviewer(s) Assigned
23 May 2023Editorial Decision: Accept