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  1. Article ; Online: It’s a matter of design—how pitfall trap design affects trap samples and possible predictions

    Fabian A. Boetzl / Elena Ries / Gudrun Schneider / Jochen Krauss

    PeerJ, Vol 6, p e

    2018  Volume 5078

    Abstract: Background Pitfall traps are commonly used to assess ground dwelling arthropod communities. The effects of different pitfall trap designs on the trapping outcome are poorly investigated however they might affect conclusions drawn from pitfall trap data ... ...

    Abstract Background Pitfall traps are commonly used to assess ground dwelling arthropod communities. The effects of different pitfall trap designs on the trapping outcome are poorly investigated however they might affect conclusions drawn from pitfall trap data greatly. Methods We tested four pitfall trap types which have been used in previous studies for their effectiveness: a simple type, a faster exchangeable type with an extended plastic rim plate and two types with guidance barriers (V- and X-shaped). About 20 traps were active for 10 weeks and emptied biweekly resulting in 100 trap samples. Results Pitfall traps with guidance barriers were up to five times more effective than simple pitfall traps and trap samples resulted in more similar assemblage approximations. Pitfall traps with extended plastic rim plates did not only perform poorly but also resulted in distinct carabid assemblages with less individuals of small species and a larger variation. Discussion Due to the obvious trait filtering and resulting altered assemblages, we suggest not to use pitfall traps with extended plastic rim plates. In comprehensive biodiversity inventories, a smaller number of pitfall traps with guidance barriers and a larger number of spatial replicates is of advantage, while due to comparability reasons, the use of simple pitfall traps will be recommended in most other cases.
    Keywords Biodiversity estimation ; Spiders ; Carabid beetles ; Ground dwelling predators ; Staphylinid beetles ; Sampling method ; Medicine ; R ; Biology (General) ; QH301-705.5
    Subject code 621
    Language English
    Publishing date 2018-06-01T00:00:00Z
    Publisher PeerJ Inc.
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Spillover from adjacent crop and forest habitats shapes carabid beetle assemblages in fragmented semi-natural grasslands

    Schneider, Gudrun / Fabian A. Boetzl / Ingolf Steffan-Dewenter / Jochen Krauss / Michael-Andreas Fritze

    Oecologia. 2016 Dec., v. 182, no. 4

    2016  

    Abstract: Semi-natural grasslands in Europe are insect biodiversity hotspots and important source habitats delivering ecosystem services to adjacent agricultural land by species spillover. However, this spillover might also occur in the opposite direction, ... ...

    Abstract Semi-natural grasslands in Europe are insect biodiversity hotspots and important source habitats delivering ecosystem services to adjacent agricultural land by species spillover. However, this spillover might also occur in the opposite direction, affecting the diversity of semi-natural grasslands. This opposite spillover has got little attention in scientific literature even though generalist species penetrating into the grasslands can affect local biotic interactions, community composition and the conservation value of grassland habitats. In this study, we examined spillover effects from two different adjacent habitat types on carabid beetle assemblages in 20 semi-natural calcareous grasslands. The grasslands were either adjacent to a cereal crop field or to a coniferous forest. We found distinct differences in carabid beetle assemblages in calcareous grasslands depending on adjacent habitat type. Species richness and activity density were higher, but the evenness was lower in calcareous grasslands adjacent to crop fields compared with calcareous grasslands adjacent to coniferous forests. Further, we found a strong spillover of carabid beetles from adjacent crop fields after crop harvest, which may result in transiently increased predation pressure and resource competition in calcareous grasslands. Our results highlight that species composition, diversity and presumably ecosystem functions within semi-natural habitats are affected by the type and management of surrounding habitats. This needs to be considered by nature conservation measures, which aim to protect the unique insect communities of semi-natural European grasslands.
    Keywords agricultural land ; Carabidae ; community structure ; coniferous forests ; ecosystem services ; ecosystems ; field crops ; forest habitats ; grasslands ; insect communities ; insects ; natural resources conservation ; predation ; species diversity ; Europe
    Language English
    Dates of publication 2016-12
    Size p. 1141-1150.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    ZDB-ID 123369-5
    ISSN 1432-1939 ; 0029-8549
    ISSN (online) 1432-1939
    ISSN 0029-8549
    DOI 10.1007/s00442-016-3710-6
    Database NAL-Catalogue (AGRICOLA)

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