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Fine-scale substrate heterogeneity does not affect arthropod communities on green roofs
Bracha Y Schindler1, Amiel Vasl1, Leon Blaustein1
1Institute of Evolution and Department of Evolutionary and Environmental Biology, University of Haifa, Haifa, Israel.
Peerj
|March 29, 2019
Summary
Green roofs support urban arthropod diversity. Substrate heterogeneity did not impact arthropod communities, but roof location significantly influenced diversity, suggesting varied placement promotes biodiversity.
Area of Science:
- Urban Ecology
- Ecology
- Environmental Science
Background:
- Green roofs provide crucial urban habitats for arthropods, supporting ecosystem services like pest control.
- Arthropod diversity is vital for urban ecosystem health and functioning.
- Theoretical frameworks suggest environmental heterogeneity enhances biodiversity.
Purpose of the Study:
- To investigate the effect of substrate heterogeneity on green roof arthropod communities.
- To test if varied substrate composition (mineral, organic, or both) influences arthropod diversity and abundance.
- To understand the indirect effects of substrate heterogeneity on plant diversity and subsequent arthropod communities.
Main Methods:
- Experimental green roof plots were established with four substrate heterogeneity treatments: homogeneous, mineral, organic, and combined.
- Treatments were replicated across three distinct roof locations in a Mediterranean region.
- Arthropod diversity, abundance, and community composition were assessed for each treatment and roof.
Main Results:
- No significant effect of substrate heterogeneity treatments on arthropod diversity, abundance, or community composition was observed.
- Significant differences in arthropod communities were found among the different roof locations.
- Local climatic conditions, influenced by roof location, appear to be a primary driver of arthropod community structure.
Conclusions:
- Substrate heterogeneity within green roofs does not appear to be a key factor in promoting arthropod diversity.
- The geographical location and associated microclimates of green roofs strongly influence their arthropod communities.
- To maximize urban arthropod biodiversity, green roofs should be distributed across diverse locations within a city, even with uniform construction.
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