Abstract
Based on the vague importance of shrub cover, an attempt was made to create a theoretical concept framework known as an ‘arthropod-island’ analytical model. These models were based on the multi-bond correlation between shrubs, soil properties, and above- and below-ground biotic communities. By utilizing published datasets on (i.e., above- and below-ground) arthropod communities related to shrub species and age, the proposed models for an ‘arthropod island’ were applied in order to determine their fitness for xeric ecosystems. It was found that the ‘arthropod-island’ concept could be the result of statistical differences in ecologically adaptive (i.e., preferable) redistribution of arthropods among the microhabitats beneath the shrub canopy and in the open spaces. Taxon density, relative to the richness and Shannon indices, was found to be more sensitive to the selected models. The relative interaction intensity index [RII = (A − B)/(A + B), A = shrub canopy value, B = intershrub value] was found to be more suitable for the ‘arthropod island’ at the community level. The relative neighbor effect [RNE = (B − A)/max(A, B)] and RII were found to be suitable at the population level, while the fitted model heavily depended on the variety of arthropod taxon. It was suggested that there were consistent ‘arthropod island’–shrub relationships between shrub species and between shrub ages in terms of arthropod density at the community level. The arthropod taxon was found to indicate an inconsistent ‘arthropod island’–shrub relationship between shrub species that differed from shrub ages at the population level.
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Acknowledgments
We thank the anonymous reviewers for their valuable comments. Special thanks to Ms. Sharon Victor for her valuable comments. Thank you to the Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwestern China of the Ministry of Education, Ningxia University for expert assistance. This project was supported by the Fok Ying Tung Education Foundation (Grant No. 151103), Ningxia Higher Education Foundation (Grant No. NGY2015053), Ningxia Natural Science Foundation (Grant No. NZ15025), and CSC/BU Joint Scholarships and Kort Postdoc Program.
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Liu, R., Pen-Mouratov, S. & Steinberger, Y. Shrub cover expressed as an ‘arthropod island’ in xeric environments. Arthropod-Plant Interactions 10, 393–402 (2016). https://doi.org/10.1007/s11829-016-9450-z
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DOI: https://doi.org/10.1007/s11829-016-9450-z