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Do landscape factors affect brownfield carabid assemblages?

Emma Small1, Jon P Sadler, Mark Telfer

  • 1Forestry Commission Wales, Victoria House, Aberystwyth, Ceredigion, SY23 2DQ, UK.

The Science of the Total Environment
|November 9, 2005
PubMed
Summary

Carabid beetle communities in derelict sites are primarily influenced by on-site habitat quality, not landscape structure. Conservation should prioritize habitat management over landscape connectivity for these species.

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Area of Science:

  • Ecology
  • Conservation Biology
  • Entomology

Background:

  • Derelict sites are increasingly recognized as valuable habitats for invertebrate biodiversity.
  • Understanding factors influencing carabid beetle assemblages in these urbanized landscapes is crucial for effective conservation.

Purpose of the Study:

  • To investigate the relationship between carabid beetle assemblages and landscape structure in West Midlands derelict sites.
  • To determine the relative importance of landscape versus within-site habitat variables on carabid communities.

Main Methods:

  • Sampling of carabid fauna across 28 derelict sites over one growing season.
  • Measurement of landscape features (corridors, density, distance to rural fringe, site size) and within-site variables (soil, vegetation, land use history).

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  • Analysis using ordination (DCA, RDA), variance partitioning (pRDA), and binary linear regression.

    • Main Results:

    • Carabid assemblages were mainly related to within-site habitat variables (site age, substrate, vegetation), with little influence from landscape structure.
    • No evidence supported that sites away from railway corridors have poorer carabid fauna.
    • Rarer, non-flying specialist species may be affected by isolation, suggesting older sites and higher derelict land density could increase species richness.

    Conclusions:

    • Habitat quality within derelict sites is the primary driver of carabid beetle assemblages.
    • Conservation strategies should focus on enhancing on-site habitat characteristics, such as maintaining early successional vegetation and substrate diversity.
    • Landscape structure appears less critical than habitat management for conserving carabid populations in derelict environments.