The efficiency of pitfall traps as a method of sampling epigeal arthropods in litter rich forest habitats

Siewers, Johanna; Schirmel, Jens; Buchholz, Sascha

doi:10.14411/eje.2014.008

Cited by 47 publications

(27 citation statements)

References 26 publications

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“…En cada uno de ellos se realizaron muestreos estacionales: en los meses de abril (otoño), agosto (invierno) y noviembre (primavera) de 2006, y marzo (verano) de 2007 para el Chaco; mientras que para el Monte y la Puna se muestreó durante los meses de noviembre (primavera) de 2005, febrero (verano), mayo (otoño) y agosto (invierno) de 2006. Se utilizó trampas de caída como método de recolección de arañas epígeas porque es muy usado en estudios faunísticos y ecológicos por ser fáciles de manipular y su bajo costo (Siewers et al, 2014), capturando un alto número de individuos y especies que permiten aplicar análisis estadísticos (Spence & Niemelä, 1994). En cada sitio se colocaron al azar diez trampas de caída separadas entre sí por 10 m a lo largo de una transecta lineal, y fueron retiradas a los siete días de actividad por estación.…”

Section: Materiales Y Métodosunclassified

Eficiencia en el uso de trampas de caída y suficiencia taxonómica en comunidades de arañas (Araneae) epigeas en tres ecorregiones del Noroeste Argentino

Cruz

Torres

González-Reyes

et al. 2017

RBT

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The increased degradation of natural habitats has strengthened the need to know and assess biodiversity patterns. Particularly, the study of the araneofauna in the North of Argentina is scarce in ecoregions with priority interests of conservation. Generally, spiders are used as indicators to compare biodiversity patterns, and here we tested whether the spider family-level can act as a substitute of the species-level in biodiversity rapid assessments. For this, we analyzed the alpha and beta diversity of the epigeal spider communities in three separate sites of different ecoregions of Salta province (Chaco Serrano, Monte de Sierras and Bolsones, and Puna), during the fall, winter, spring and summer of 2005 -2007. In each site, 10 pitfall traps, located along a linear transect and 10 meters apart, were placed for seven days per season of continuous activity. Samples were obtained, taken to the laboratory and identified. A total of 886 spiders were collected from 100 species/morphospecies of 19 families. The completeness of the inventory obtained for each ecoregion surpassed 70 %. The Chaco ecoregion (S = 56, N = 495) reported the highest species richness and abundance compared to Monte (S = 44, N = 262) and Puna (S = 23, N = 129). Alpha and beta diversity showed that ecoregional spider communities were different, sharing between them very few species (0.7 %). The Chaco reported a high dissimilarity of its assemblage with respect to the other ecoregions. The colder seasons (autumn and winter) proved to be important in assessing the diversity of spiders in these ecoregions, contributing to regional diversity in conjunction with the diversity of warm seasons (spring and summer). Four guilds were reported (ground hunters, specialists, other hunters and ambush hunters), but the latter was absent in Monte, and the specialists dominated in Chaco. Zodariidae was dominant in Chaco Serrano, where Leprolochus birabeni is an indicator of native environments. On the other hand, Lycosidae, Philodromidae, Anyphaenidae and Oonopidae were important for Monte and Puna. This way, the use of pitfall traps in all seasons of the year, and the recognition of spider families for epigeal fauna, was very useful for biodiversity rapid assessments in this area. Like the species-level, the taxonomic family-level evidenced changes in alpha and beta diversity. This allowed the inclusion of this taxonomic group for future biodiversity monitoring studies for conservation plans in these ecoregions.

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Section: Materiales Y Métodosunclassified

Eficiencia en el uso de trampas de caída y suficiencia taxonómica en comunidades de arañas (Araneae) epigeas en tres ecorregiones del Noroeste Argentino

Cruz

Torres

González-Reyes

et al. 2017

RBT

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“…In accordance with our results, Cheli & Corley (2010) also report no effect of roofs on the sampling of spiders. On the other hand, Siewers et al (2014) report that the largest carabids and spiders were more frequently recorded in pitfall traps with plastic covers, than in pitfall traps with other types of cover, e.g., wire mesh. Colour of the roof has no effect on the capture effi ciency of carabid beetles and spiders (Buchholz & Hannig, 2009), however, opaque roofs may lower the sampling effi ciency of species of day-active carabids (Baars, 1979;Bell et al, 2014).…”

Section: Discussionmentioning

confidence: 92%

Efficiency of pitfall traps with funnels and/or roofs in capturing ground-dwelling arthropods

Császár¹,

Torma²,

Gallé‐Szpisjak³

et al. 2018

Eur. J. Entomol.

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Abstract. Pitfall traps are widely used for sampling ground-dwelling arthropods. Their sampling effi ciency is affected by several factors, e.g. material, size and modifi cation of parts of the trap and sampling design. Pitfall trap sampling is also affected by the accumulation of plant litter in the traps, rain fall and by-catches of small vertebrates, which may cause a bias in the catch by obstructing traps or attracting certain insects. A roof that prevents rain and plant litter entering a trap, prevents dilution of the preservative and escape of arthropods. The main goal of present study was to compare the effect of four types of differently combined funnel and roof pitfall traps on the capture effi ciency of epigeal arthropods. We found that a funnel and/or a roof had no effect on spider catches. Total abundance of large carabids and thus the total abundance of ground beetles was lower in funnel pitfall traps without a roof than in other types of traps. However, funnel pitfall traps with roofs collected signifi cantly more carabid beetles, especially individuals of those species that are large or good fl iers. We conclude that funnel pitfall traps with roofs have no negative effects on capture effi ciency of ground beetles and spiders, therefore application of this sampling technique is strongly recommended.

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“…One application of movement models arises from the needs of ecological monitoring (Greenslade, 1964;Byers, 2012;Siewers et al, 2014;Miller et al, 2015). Monitoring of invertebrates, insects in particular, is often performed by installing traps and then interpreting trap counts (catches).…”

Section: Discussionmentioning

confidence: 99%

Three-dimensional random walk models of individual animal movement and their application to trap counts modelling

Ahmed

Benhamou

Bonsall

et al. 2020

Preprint

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Background: Random walks (RWs) have proved to be a powerful modelling tool in ecology, particularly in the study of animal movement. An application of RW concerns trapping which is the predominant sampling method to date in insect ecology, invasive species, and agricultural pest management. A lot of research effort has been directed towards modelling ground-dwelling insects by simulating their movement in 2D, and computing pitfall trap counts, but comparatively very little for flying insects with 3D elevated traps. Methods: We introduce the mathematics behind 3D RWs and present key metrics such as the mean squared displacement (MSD) and path sinuosity, which are already well known in 2D. We develop the mathematical theory behind the 3D correlated random walk (CRW) which involves short-term directional persistence and the 3D Biased random walk (BRW) which introduces a long-term directional bias in the movement so that there is an overall preferred movement direction. In this study, we consider three types of shape of 3D traps, which are commonly used in ecological field studies; a spheroidal trap, a cylindrical trap and a rectangular cuboidal trap. By simulating movement in 3D space, we investigated the effect of 3D trap shapes and sizes and of movement diffusion on trapping efficiency. Results: We found that there is a non-linear dependence of trap counts on the trap surface area or volume, but the effect of volume appeared to be a simple consequence of changes in area. Nevertheless, there is a slight but clear hierarchy of trap shapes in terms of capture efficiency, with the spheroidal trap retaining more counts than a cylinder, followed by the cuboidal type for a given area. We also showed that there is no effect of short-term persistence when diffusion is kept constant, but trap counts significantly decrease with increasing diffusion . Conclusion: Our results provide a better understanding of the interplay between the movement pattern, trap geometry and impacts on trapping efficiency, which leads to improved trap count interpretations, and more broadly, has implications for spatial ecology and population dynamics.

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The efficiency of pitfall traps as a method of sampling epigeal arthropods in litter rich forest habitats

Cited by 47 publications

References 26 publications

Eficiencia en el uso de trampas de caída y suficiencia taxonómica en comunidades de arañas (Araneae) epigeas en tres ecorregiones del Noroeste Argentino

Eficiencia en el uso de trampas de caída y suficiencia taxonómica en comunidades de arañas (Araneae) epigeas en tres ecorregiones del Noroeste Argentino

Efficiency of pitfall traps with funnels and/or roofs in capturing ground-dwelling arthropods

Three-dimensional random walk models of individual animal movement and their application to trap counts modelling

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