Biodiversity and Conservation

, Volume 18, Issue 5, pp 1147–1159 | Cite as

Testing common habitat-based surrogates of invertebrate diversity in a semi-arid rangeland

  • John R. Gollan
  • Michael B. Ashcroft
  • Gerasimos Cassis
  • Andrew P. Donnelly
  • Scott A. Lassau
Original Paper

Abstract

Habitat-based surrogates are a low cost alternative to intensive biodiversity surveys, though they have been poorly investigated in semi-arid ecosystem compared to others such as temperate woodlands. In this study we tested potential habitat-based surrogates of invertebrate richness in a semi-arid rangeland in northwest Australia. Potential surrogates were: distance from artificial watering-point; soil hardness; habitat complexity; and individual complexity components. Generalised additive models (GAMs) were used to relate abundance and richness of selected invertebrates with environmental factors and cluster analysis was used to examine similarity in species composition. The most frequently selected factor was soil hardness, but taxa varied as to whether biodiversity was higher in soft or hard soils. Where distance from watering-point was an important predictor, there were generally higher abundances and richness closer to watering-points than further away. Abundance and species richness could be partially explained using individual complexity components, but relationships were weak and there were no consistent trends among taxa. Therefore, although habitat complexity has been correlated with species richness under some circumstances, our results cast doubt on the generality of this relationship. There are also dangers in assuming that all taxa respond in a manner similar to indicator taxa, as we observed that different taxa had higher richness at opposite extremes of some environmental gradients. Grazing may have a negative impact on biodiversity in some environments, but in regions where water is limiting, the net effect may be positive due to the creation of waterholes.

Keywords

Arthropods Complexity GAM Grazing Indicators Watering-point 

Notes

Acknowledgments

This research was undertaken as part of the Australian Museum–Rio Tinto partnership and funded through the Rio Tinto WA Future Fund. We thank M. Elliott, L. Kampen and M. Bulbert for help with fieldwork. Thanks to D. Smith (ants), S. Ginn (wasps, flies) and G. Brown (beetles) for taxonomic sorting and/or identifications, and Dr C. Reid, Dr D. Bickel, Dr D. McAlpine, and Dr S. McEvey for their taxonomic advice. We also thank two anonymous reviewers for useful comments on an earlier draft.

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • John R. Gollan
    • 1
  • Michael B. Ashcroft
    • 1
  • Gerasimos Cassis
    • 1
    • 2
  • Andrew P. Donnelly
    • 1
    • 3
  • Scott A. Lassau
    • 1
    • 4
  1. 1.Australian MuseumSydneyAustralia
  2. 2.School of Biological, Earth and Environmental SciencesUniversity of New South WalesSydneyAustralia
  3. 3.Earthwatch Institute AustraliaSouth MelbourneAustralia
  4. 4.Pest Management UnitNew South Wales National Parks and Wildlife ServiceSydneyAustralia

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