On the Nature of Agrobiont Spiders

Samu, Ferenc; Szinetár, Csaba

doi:10.1636/0161-8202(2002)030[0389:otnoas]2.0.co;2

Cited by 147 publications

(116 citation statements)

References 12 publications

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“…Relatively big spiders of the family Lycosidae mostly have one abundance peak in the growing season, which is from May to July, but it fluctuates throughout the year for species belonging to the family Linyphiidae (Bel'skaya and Esyunin, 2003;Jõgar et al, 2004). Phenological differences in the species of spiders depending on the environment type were also noted in the literature (Szymkowiak and Woźny, 1998;Samu and Szinetar, 2002).…”

Section: Introductionsupporting

confidence: 57%

Diel and seasonal activity of ground dwelling spiders (Araneae) in a sandy grassland habitat

Król¹,

Hajdamowicz²,

Tkaczuk³

2018

Turk J Zool

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The paper concerns the diel and seasonal activity of ground dwelling spiders on a sandy grassland in the Bug River Valley in East-Central Poland. The spiders were captured using pitfall traps in 2009 and 2010 from May to July. The material was collected one day a week, day and night. Traps were checked every 3 h, eight times a day. It was found that for spiders with larger bodies, from the families Lycosidae and Philodromidae, the peak of their activity was in the afternoon, and smaller spiders belonging to the families Linyphiidae and Tetragnathidae showed the greatest activity in the morning. Species Pardosa palustris and Xerolycosa miniata were dominant spiders of the studied grassland. The time of their highest diel activity was different by several hours. It was observed that P. palustris individuals were more numerous in that habitat in early June and X. miniata spiders from mid-June. Spiders of the dominant family Lycosidae were in the highest numbers in the second half of May and in early June, while most of the spiders of other families were captured before or after the period of prevailing presence of dominant spiders.

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Section: Introductionsupporting

confidence: 57%

Diel and seasonal activity of ground dwelling spiders (Araneae) in a sandy grassland habitat

Król¹,

Hajdamowicz²,

Tkaczuk³

2018

Turk J Zool

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“…This study identified a butterfly assemblage occurring along maize field margins in southern Germany. The observed pattern was typical for invertebrate communities in agro-ecosystems comprised of a few dominants with remaining species occurring in relatively small proportions (Luff, 2002;Samu and Szinetár, 2002;Tischler, 1958). In general, the observed butterflies were common species typical of arable land, 33 species observed being within the expected range for richness (Ebert and Rennwald, 1991a;Feber et al, 1996;Kruess and Tscharntke, 2002;Munguira and Thomas, 1992;SteffanDewenter and Tscharntke, 1997).…”

Section: Discussionmentioning

confidence: 83%

Monitoring the impact ofBtmaize on butterflies in the field: estimation of required sample sizes

Lang

2004

Environ. Biosafety Res.

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The monitoring of genetically modified organisms (GMOs) after deliberate release is important in order to assess and evaluate possible environmental effects. Concerns have been raised that the transgenic crop, Bt maize, may affect butterflies occurring in field margins. Therefore, a monitoring of butterflies was suggested accompanying the commercial cultivation of Bt maize. In this study, baseline data on the butterfly species and their abundance in maize field margins is presented together with implications for butterfly monitoring. The study was conducted in Bavaria, South Germany, between 2000-2002. A total of 33 butterfly species was recorded in field margins. A small number of species dominated the community, and butterflies observed were mostly common species. Observation duration was the most important factor influencing the monitoring results. Field margin size affected the butterfly abundance, and habitat diversity had a tendency to influence species richness. Sample size and statistical power analyses indicated that a sample size in the range of 75 to 150 field margins for treatment (transgenic maize) and control (conventional maize) would detect (power of 80%) effects larger than 15% in species richness and the butterfly abundance pooled across species. However, a much higher number of field margins must be sampled in order to achieve a higher statistical power, to detect smaller effects, and to monitor single butterfly species.

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“…The species' specific habitat requirements and the lack of natural rivers and suitable habitats most likely reduce the species' occurrence. The set of species was replenished with active hunters associated with sandy grasslands, grazing lands, and arable fields: representatives of Lycosidae (Xerolycosa miniata and Pardosa agrestis), as well as Thomisidae (Ozyptila trux) (Roberts, 1993;Szymkowiak and Woźny, 1998;Samu and Szinetár, 2002). These xerophilous species appeared later in the season, only after the water level lowered.…”

Section: Discussionmentioning

confidence: 99%

Spider assemblages and dynamics on a seasonal island in the Pripyat River, Belarus

Hajdamowicz¹,

Pilacka²,

Meissner³

2015

Turk J Zool

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Spider assemblages on a seasonal river meadow island were studied in spring 2006 and 2007. Samples were collected with a set of 20-30 pitfall traps once every 5 days. Altogether, 1179 spiders belonging to 30 species were collected. There were 5 constant dominant species: medium-sized wandering Pardosa prativaga, and small-sized air colonizers Oedothorax retusus, Erigone dentipalpis, Oedothorax fuscus, and Pachygnatha degeeri. The relatively low species diversity was higher in 2007 and grew throughout the season with the lowering of the water level. The total turnover of species involved the least abundant species (below 1% of the total), mainly Linyphiidae. Abundance of small-sized species was negatively correlated with abundance of medium-sized species. The activity density of small-sized species was higher at the beginning of the spring season with O. retusus being especially dependent on the high water level, while the number of medium-sized species and P. prativaga were correlated with the water lowering. The assemblages of ground-dwelling spiders were exposed to seasonal and annual changes, but due to the proximity of refugia and rapid colonization, not all assemblages were affected. Spider dynamics on the seasonal island reflected a general activity pattern where, over time, small-sized species avoided larger predators, which were additionally stopped by high water levels.

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On the Nature of Agrobiont Spiders

Cited by 147 publications

References 12 publications

Diel and seasonal activity of ground dwelling spiders (Araneae) in a sandy grassland habitat

Diel and seasonal activity of ground dwelling spiders (Araneae) in a sandy grassland habitat

Monitoring the impact ofBtmaize on butterflies in the field: estimation of required sample sizes

Spider assemblages and dynamics on a seasonal island in the Pripyat River, Belarus

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