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Long-Distance Rescue and Slow Extinction Dynamics Govern Multiscale Metapopulations.

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Habitat fragmentation impacts species persistence. Our metapopulation model reveals heterogeneous island size distributions slow extinction and long-distance dispersal sustains regional occupancy, crucial for conservation.

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Area of Science:

  • Ecology
  • Conservation Biology
  • Theoretical Ecology

Background:

  • Species dynamics are influenced by dispersal, yet the combined effects of short- and long-distance colonization in fragmented habitats are not fully understood.
  • Metapopulation dynamics are crucial for understanding species persistence in patchy environments.
  • Habitat fragmentation poses significant challenges to biodiversity conservation.

Purpose of the Study:

  • To investigate how multiscale colonization processes affect regional occupancy dynamics in fragmented habitats.
  • To explore the role of island size distribution (ISD) in metapopulation persistence.
  • To determine the impact of long-distance dispersal on small island viability.

Main Methods:

  • Development of a metapopulation model incorporating local and long-distance colonization.
  • Analysis of regional occupancy dynamics under varying island size distributions.
  • Simulation of extinction and colonization processes in a fragmented landscape.

Main Results:

  • Heterogeneous island size distributions significantly slow extinction dynamics, independent of extinction debt.
  • Long-distance colonization can rescue small, vulnerable islands from local extinction.
  • A steady regional occupancy can be maintained through long-distance dispersal events.

Conclusions:

  • Island size distribution is a critical factor in long-term metapopulation persistence.
  • Long-distance dispersal plays a vital role in maintaining regional occupancy and preventing extinctions in fragmented habitats.
  • Findings offer insights for designing effective conservation strategies in fragmented landscapes.