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Metapopulation extinction thresholds in rain forest remnants.

Charles E Zartman1, A Jonathan Shaw

  • 1Department of Biology, Duke University, Durham, North Carolina 27707, USA. charles_e_zartman@hotmail.com

The American Naturalist
|May 4, 2006
PubMed
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Habitat fragmentation threatens biodiversity. In Amazonia, small forest fragments (<10 ha) showed reduced colonization for bryophytes, leading to species loss despite positive local growth. Larger reserves (>100 ha) improved colonization rates.

Area of Science:

  • Ecology
  • Biodiversity conservation
  • Tropical ecology

Background:

  • Habitat fragmentation is a primary driver of biodiversity loss.
  • Demographic impacts of fragmentation on tropical species are understudied.
  • Landscape-scale studies quantifying fragmentation effects on colonization, extinction, and growth are scarce.

Purpose of the Study:

  • To investigate the demographic mechanisms of species loss in tropical forest fragments.
  • To quantify the effects of habitat fragmentation on colonization, extinction, and population growth.
  • To assess the role of reserve size in metapopulation dynamics of epiphyllous bryophytes.

Main Methods:

  • Multiyear demographic census of 292 epiphyllous bryophyte populations.
  • Transplantation experiments across a network of forest sites (1, 10, 100, >10,000 ha) in central Amazonia.

Related Experiment Videos

  • Analysis of local population growth, colonization, and extinction probabilities in relation to fragment size.

    • Main Results:

    • All populations exhibited positive local growth (lambda > 1) and constant extinction probability (15%).
    • Colonization probability was significantly higher in larger reserves (>= 100 ha) (48%) compared to small reserves (<= 10 ha) (27%).
    • Reduced colonization, not local extinction, is the primary cause of species loss in small fragments.

    Conclusions:

    • Species loss in small tropical forest fragments is driven by reduced colonization rates.
    • Maintaining colonization/extinction ratios well above unity is crucial for metapopulation persistence in dynamic environments.
    • Conservation strategies should prioritize larger reserves to enhance colonization and ensure long-term biodiversity survival.