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Landscape Structure Affects Metapopulation-Scale Tipping Points.

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    Ecosystems can undergo abrupt shifts, a phenomenon known as hysteresis, which is difficult to predict and reverse. This study reveals that landscape structure and dispersal rates significantly influence these catastrophic shifts in metapopulations.

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    Area of Science:

    • Ecology
    • Environmental Science
    • Theoretical Ecology

    Background:

    • Ecosystems can exhibit abrupt shifts between states, even with gradual environmental changes.
    • These catastrophic shifts can display hysteresis, making them difficult to predict and reverse.
    • Understanding shifts in spatially structured landscapes is crucial but remains limited.

    Purpose of the Study:

    • To investigate landscape-scale stability in metapopulations prone to catastrophic shifts.
    • To analyze how spatial structure (modular, dendritic) and dispersal influence these shifts.
    • To identify factors that reduce hysteresis at the landscape level.

    Main Methods:

    • Modeling metapopulation dynamics on different landscape structures.
    • Simulating local catastrophic shifts within connected patches.
    • Analyzing the impact of varying population dispersal rates.

    Main Results:

    • Metapopulations commonly exhibit large-scale catastrophic shifts and hysteresis.
    • Shift properties strongly depend on spatial structure and dispersal rate.
    • Intermediate dispersal, low average degree, or riverine structures reduce hysteresis size.

    Conclusions:

    • Landscape structure and dispersal are key determinants of catastrophic shifts and hysteresis.
    • Restoration efforts may be more effective when spatially clustered.
    • Targeting populations with intermediate dispersal rates can facilitate easier large-scale restoration.