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The Epigeic Spider Fauna of Single-Row Hedges in a Danish Agricultural Landscape

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The Epigeic Spider Fauna of Single-Row Hedges in a Danish Agricultural Landscape 237 European Arachnology 2000 (S. Toft & N. Scharff eds.), pp. 237-242. © Aarhus University Press, Aarhus, 2002. ISBN 87 7934 001 6 (Proceedings of the 19th European Colloquium of Arachnology, Århus 17-22 July 2000) The epigeic spider fauna of single-row hedges in a Danish agricultural landscape SØREN TOFT1 & GABOR L. LÖVEI2 1Department of Zoology, University of Aarhus, Building 135, DK-8000 Århus C, Denmark ([email protected]) 2Danish Institute of Agricultural Science, Research Centre Flakkebjerg, Department of Crop Protection, DK-4200 Slagelse, Denmark ([email protected]) Abstract To characterise arthropod biodiversity supported by one type of non-cultivated habitat patches in a cultivated Danish landscape, ground-active arthropods were collected by pitfall traps in three single-row hedgerow types near Bjerringbro, central Jutland, Denmark. Three each of hawthorn (Crategus monogyna), rowan (Sorbus intermedia), or white spruce (Picea glauca) hedgerows were sampled twice yearly, in early (June) and late summer (late August) using 20 pitfall traps per habitat patch (10 in centre, 10 at edge). A total of 71 spider species were identified among 1422 individu- als: 33 species (515 individuals) were found in hawthorn hedges, 52 species (653 individuals) in rowan, and 48 species (254 individuals) in spruce. Principal Component Analysis clearly separated the spider assemblages by tree species of the hedge. There was no difference between edge and central traps neither at the assemblage nor at the species level. Most species captured were char- acteristic of non-cultivated land (Diplostyla concolor, Diplocephalus latifrons, Oxyptila praticola, Zelotes pusillus), or associated with more permanent grassland rather than cultivated crops (Pardosa prati- vaga, Pachygnatha degeeri). Species typical of cultivated agricultural fields were infrequent (Erigone atra, Bathyphantes gracilis, Meioneta rurestris, Oedothorax apicatus) or missing altogether (eg. Araeon- cus humilis). Thus, the narrow single-row hedges were faunistically very little influenced by the cul- tivated matrix habitat enclosing them. Key words: biodiversity, hedgerows, spider assemblages, habitat affinity, rowan, hawthorn, spruce INTRODUCTION a more efficient management of biodiversity as Biodiversity in the agricultural landscape has well as of the ecosystem services they provide traditionally been associated with non- (Daly 1999). The study of predatory arthropods cultivated areas, even though a considerable such as spiders is obviously relevant in this number of species can be found on cultivated respect. land (Meszaros 1984; regarding spiders: Toft Because of methodological differences, 1989; Vangsgaard 1996). With the increasing studies of hedgerow spiders can be grouped human pressure on such habitats, the signifi- into those considering the fauna of higher cance of biodiversity that can be supported by vegetation (see Nährig 1991; Ysnel & Canard agricultural land is bound to increase. Little is 2000), and those considering the ground-active known, however, of the level of biodiversity fauna (Blick 1989; Henatsch & Blick 1993; that can be supported, and how uncultivated Møller-Nielsen 1990; Reinke & Irmler 1994; areas interact with the cultivated land. An im- Bergthaler 1996). Hedgerows obviously add to proved understanding of these is necessary for the biodiversity of the arable landscape 238 European Arachnology 2000 through the shrub and tree living species that Aidt1, Aidt2), three of rowan (Sorbus interme- would otherwise be absent. Hedges also add, dia) (Sahl, Gerning, Aldrup), and three of however, to the fauna of ground-active spiders, spruce (two of white spruce Picea glauca, one of especially woodland species. Earlier studies on sitka spruce Picea sitchensis) (Sahl1, Sahl2, the epigeic fauna indicated that: A) hedgerows Lådnehøje). They were old, well established are inhabited by an assemblage distinct from hedges of the single-row type. The total width those of fields as well as woodlands (Blick was variable as some hedges had a wide grass 1989; Møller-Nielsen 1990; Reinke & Irmler covered base (total hedge width, range of 1994); B) they are often dominated by wood- means at the three locations: hawthorn, 2.4 – land or forest-edge species rather than by field 4.0 m; rowan, 2.6 – 5.0 m; spruce, 3.0 – 3.3 m ). species (Blick 1989); and C) the spider assem- One hedge differed in some of these respects: blages show high species richness because the sitka hedge was planted alternately in two woodland and open-land species mix into a rows, it was rather dense with branches to the composite assemblage. Reinke & Irmler (1994) ground, thus creating a vegetation-free centre. found only one type of hedge with dominance Other peculiarities of single hedges will be of the field species Erigone atra (Bl.): low hedges mentioned along with the results. The nine on sandy soil, poor in ground vegetation. sample locations were at a distance of 200 m – Though some of the hedges studied previously 10 km from each other, within a 4 km x 10 km were quite young, they were composed of at area. Individual hedgerows were sampled least three rows of trees or shrubs and thus of a twice yearly, in early (June 1999) and late sum- considerable width (Blick 1989: 6-8 m; Møller- mer (early September 1999), using 20 pitfalls Nielsen 1990: 4.5 - 5 m; Bergthaler 1996: 3.5 m). per habitat patch. Ten of the traps were set at As soon as the canopy closes, a ‘forest floor’ the edge, and ten in the centre of the hedgerow, habitat is created in the centre of the hedge, the at a distance of 10 m between individual traps. ground being covered by leaf litter rather than Neighbouring traps alternated with respect to grasses or herb vegetation. The spider fauna of position. Edge traps were situated only 10-20 old single-row hedges in which the woodland cm from the adjacent cultivated field. character of the habitat is not obvious, was ex- Individual pitfall traps were plastic cups of pected to be more influenced by influx from 10 cm diameter, filled with about 200 ml of 70% surrounding fields, but has to our knowledge ethylene glycol solution and a drop of deter- not previously been analysed. gent. Traps were sunk into the ground so that We studied the assemblages of ground- their rim was level with the soil surface. Every active spiders in three types of single-row trap was covered with a galvanised metal hedges in central Jutland, Denmark, and from square cover to protect the trap contents from the analysis of one year’s results, we describe a rain and disturbance by frogs, birds or small fairly high degree of species richness. More- mammals. Traps were set for one week at a over, the fauna was not highly influenced by time. Trap catches were sieved in the field and that of the fields. Apart from an unpublished transferred into glass vials containing 70% thesis (Møller-Nielsen 1990) on three 13 year ethyl alcohol. Trap catches with small mam- old 3-rowed hedges, this is the first account of mals or frogs as well as displaced or raised hedgerow spiders in Denmark. traps (33 of a total of 360) were not included in the evaluation. In the laboratory, the samples STUDY AREA AND METHODS were sorted under a microscope, and ground Our study took place in the area of Bjerringbro, beetles and spiders were put into separate vials central Jutland, Denmark. Nine hedgerows and stored in 70% ethyl alcohol until identifica- were selected for study; three of hawthorn tion. (Crategus monogyna) (localities: Lådnehøje, Identification was made by ST. Spider tax- Toft & Lövei: Hedgerow spiders 239 3 Fig. 1. The results of Principal E Component Analysis on un- Låd transformed spider capture C data in nine hedgerows near 2 Bjerringbro, Jutland, Denmark. E: edge traps, C: centre traps. Aidt1, Aidt2, Ald, Ger, Låd, 1 Sahl1, Sahl2 are abbreviations Aidt1 Sahl C Ald for sites (see text). PC2 E C E 0 E C E Ger Aidt2 E E C Låd C C Sahl1 Hedge type -1 E C Sorbus C E Sahl2 Crataegus Picea -2 -2-10123 PC1 1,0 Fig. 2. Habitat affinity relations Dip.con of the 19 most common spider Dip.lat species according to PCA (Cf. Fig. 1.). Lep.ten For abbreviations of species names: see appendix 1. 0,5 Par.pal Eri.atr Par.lug Par.pra PC2 All.sco Rob.liv Alo.pul 0,0 Agy.con Tro.ter Poc.pum Oxy.pra Zel.sub Bat.gra Zel.pus Euo.fro Pac.deg -0,5 01 PC1 onomy follows Platnick (1993). The total (early total of 72 spider species were identified among + late summer) catches of 10 traps (centre or 1563 individuals (Appendix 1). In Sorbus edge) of each hedgerow were summed, giving hedgerows, 722 individuals of 52 species were 18 sites. The species/sites matrix was analysed captured, followed by Crataegus (548 individu- with a Principal Component Analysis (PCA) on als of 33 species). Picea hedgerows had the untransformed numbers using the CANOCO 4 smallest number of individuals (293 spiders) program (ter Braak & Smilauer 1998; cf. Jong- but not the lowest species richness (49 species). man et al. 1987). All species were included in The Principal Component Analysis gave a clear the analysis, but only the more abundant ones separation of hedges according to tree species (≥ 10 individuals) are shown in the species plot. (Fig. 1): Sorbus hedges were distinguished from the other two types along the first axis; RESULTS Crataegus and Picea hedges separated along the In the captures from the nine hedgerows, a second axis. 240 European Arachnology 2000 Fig. 2 shows which species were respons- A study of newly planted hedgerows in Aus- ible for the separations of hedge types: Pardosa tria (Bergthaler 1996), even though longer in prativaga, Trochosa terrestris, and Pocadicnemis duration and collecting more spiders, found pumila were especially abundant in the Sorbus fewer species (44).
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