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(1964) Pitfall trapping as a method of sampling populations of Carabidae (Coleoptera). (1989) Comparisons of treatments after an analysis of variance in ecology. (1980) Pitfalls in spider community studies. (1994) Estimating terrestrial biodiversity through extrapolation. (1996) Estimating spider species richness in a southern Appalachian cove hardwood forest. Portland: Dioscordes Press.Ĭoddington, J.A., Young, L.H. In The unity of evolutionary biology: Proceedings of the fourth international congress of systematic and evolutionary biology (E.C. (1991) Designing and testing sampling protocols to estimate biodiversity in tropical ecosystems. London: Kluwer Academic Publishers.Ĭoddington, J.A., Griswold, C.E., Davila, C.E., Penaranda, D.S. (1989) The soils and landforms of the northern Jarrah forest. Memoirs of the Queensland Museum 33, 475–81.Ĭhurchward, H.M. (1993) Effects of sampling methods on composition of a Tasmanian coastal heathland spider assemblage. Sydney: Research Unit for Biodiversity and Bioresources, School of Biological Sciences, Macquarie University.Ĭhurchill, T.B. In Rapid biodiversity assessment: Proceedings of the biodiversity assessment workshop, 3-, Macquarie University, Sydney, Australia (A.J. (1993) Rapid biodiversity assessment: A review. Sydney: Research Unit for Biodiversity and Bioresources, School of Biological Sciences, Macquarie University.īeattie, A.J., Majer, J.D. (1995) The effects of pitfall trap diameter on ant species richness (Hymenoptera: Formicidae) and species composition of the catch in a semi-arid eucalypt woodland. Berkeley, CA: Abacus Concepts Incorporated.Ībensperg-Traun, M. Berkeley, CA: Abacus Concepts Incorporated.Ībacus Concepts Inc. Given that the 11.1 cm trap performed similarly with respect to handling time, however, we tentatively considered this size most appropriate owing to an ethical consideration – smaller trap sizes may decrease the potential for capture of non-target species.Ībacus Concepts Inc. These results suggest the largest trap size was optimal. Both caught nine species whereas all other traps caught The largest trap size (17.4 cm) was most efficient in terms of number of traps and trap circumference. Three different criteria were considered: equivalent number of traps (15), standardized sampling intensity (cumulative trap circumference, approximately 207 cm) and standardized cumulative handling time (approximately 1 hour 17 minutes). Determination of an optimal trap size was undertaken by bootstrapping and calculating species accumulation curves for increasing numbers of traps used. No significant differences in these dependent variables occurred between 4.3 and 7.0 cm traps, or for species richness between 11.1 and 17.4 cm traps. Post-hoc tests revealed abundance, family richness and species richness increased with increasing trap sizes for traps ≥7.0 cm. Two-way ANOVAs revealed no significant interaction effects between trap size or the spatial positioning of transects within the study site along which the pitfall traps were arranged. Four different trap diameters (4.3, 7.0, 11.1 and 17.4 cm) were examined (4 trap sizes × 15 replicates = 60 traps). This study presents preliminary findings from a single short sampling period on the role of trap size in sampling spiders in a Western Australian Jarrah forest. To date, very few invertebrate studies have considered what trap size is optimal for sampling spiders. Pitfall trapping is a sampling technique extensively used to sample surface foraging invertebrates for biological diversity studies and ecological monitoring.
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