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    Remotely-sensed slowing down in spatially patterned dryland ecosystems

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    Journal Article (2.439Mb)
    Date
    2022-10
    Author
    Veldhuis, M.P.
    Martinez-Garcia, R.
    Deblauwe, V.
    Dakos, V.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Regular vegetation patterns have been predicted to indicate a system slowing down and possibly desertification of drylands. However, these predictions have not yet been observed in dryland vegetation due to the inherent logistic difficulty to gather longer-term in situ data. Here, we evaluate the theoretical prediction that regular vegetation patterns are associated with empirically derived temporal indicators (autocorrelation, variance, responsiveness) of critical slowing down in a dryland ecosystem in Sudan using different remote sensing products. We use recently developed methods using remote-sensing EVI time-series in combination with classified regular vegetation patterns along a rainfall gradient in Sudan to test the predicted slowing down. We tested our empirical findings against theoretical predictions from a stochastic version of a spatial explicit model that has been used to describe vegetation dynamics in drylands under aridity stress. Overall, three temporal indicators (responsiveness, temporal autocorrelation, variance) show slowing down as vegetation patterns change from gaps to labyrinths to spots towards more arid conditions, confirming predictions. However, this transition exhibits non-linearities, specifically when patterns change configuration. Model simulations reveal that the transition between patterns temporarily slows down the system affecting the temporal indicators. These transient states when vegetation patterns reorganize thus affect the systems resilience indicators in a non-linear way. Our findings suggest that spatial self-organization of dryland vegetation is associated with critical slowing down, but this transition towards reduced resilience happens in a non-linear way. Future work should aim to better understand transient dynamics in regular vegetation patterns in dryland ecosystems, because long transients make regular vegetation patterns of limited use for management in anticipating critical transitions.
    https://dx.doi.org/10.1111/ecog.06139
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/8000
    IITA Authors ORCID
    Vincent Deblauwehttps://orcid.org/0000-0001-9881-1052
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1111/ecog.06139
    Research Themes
    Plant Production and Health
    IITA Subjects
    Climate Change; Food Security; Meteorology and Climatology
    Agrovoc Terms
    Vegetation; Resilience; Sudan; Ecosystems
    Regions
    Africa; North Africa
    Countries
    Sudan
    Hubs
    Central Africa Hub
    Journals
    Ecography
    Collections
    • Journal and Journal Articles4836
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