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Lasius niger (L.) Ants Invade the Web of an Agelenid Spider

Elżanowski A., Czechowski W.

Polish Journal of Ecology

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2015

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Vol. 63, nr 4

623--626

EN

Black garden ants Lasius niger (L.) were observed to invade a web of an agelenid funnel spider (Agelena labyrinthica Clerck or Allagelena gracilens C. L. Koch) and to take the entangled prey away, probably after driving the resident spider out of the web. The observation adds to a few examples of ants invading spider webs and suggests complex interactions between ants and funnel spiders which are known to feed on rather than being ousted by ants.

2

Towards a general species-time-area-sampling effort relationship

Ulrich W., Zalewski M., Hajdamowicz I., Stańska M., Ciurzycki W., Tykarski P.

Polish Journal of Ecology

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2013

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Vol. 61, nr 2

197--205

EN

Species – area (SAR) and species time (STR) relationships describe the increase of species richness with study area and study time and have received much attention among ecologists and are used in different branches of biodiversity research. Unknown sample size effects often hinder a direct comparison of SAR and STR shapes of different taxa and regions. Further, space and time interact during the accumulation of species due to the common sample universe. Here we develop a simple power function scaling model of species richness that integrates space, time, sample size and their interactions. We show that this model is able to precisely describe average species densities and the increase of species richness in a regional metacommunity of a large sample of spiders on Mazurian lake islands (Northern Poland). The model predicts strong area – sample size and time – sample size interactions. Judged from the SAR (z = 0.08) and STR (y = 0.64) slopes it points to only moderate spatial β–diversities but high local temporal species turnover. We suspect that the parameters of many published SARs are strongly influenced by unknown sampling time and sample size effects that make direct comparison difficult.

3

Can periodically drained ponds have any potential for terrestrial arthropods conservation? - a pilot survey of spiders

Tropek R.

Polish Journal of Ecology

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2012

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Vol. 60, nr 3

635-639

EN

Periodical summer drying has been a common practice in fishponds management in many intensively used European landscapes. It was shown that these ephemeral biotopes are often colonised by endangered plant communities typical for riverine gravel beds. However, almost nothing is known about their conservation potential for terrestrial arthropods. Spiders at a periodically drained bottom of the Manovicky rybnik pond, western Czech Republic, were surveyed from May to September 2007 by pitfall-trapping, vegetation sweeping and individual collecting. Although just 25 spider species were found, several of them are considered as regionally important. Psammophilous Steatoda albomaculata (nationally nearly threatened) and xerothermophilous Tricca lutetiana are regionally very rare species occurring mainly in warmer areas; the Manovicky rybnik pond is only their second known locality in the study region. Hypsosinga heri and H. pygmaea, two recorded hygrophilous species, are regionally very rare species of colder, near-natural wetlands. The combination of several other hygrophilous and xerothermophilous species, caused by habitat diversity of extreme substrate conditions, forms the spider community at the site. Co-occurrence of these species and abiotic conditions was typical for periodically disturbed riverine gravel beds, an almost vanished habitat in Central Europe. The relatively broad habitat relations diversity of the species inhabiting this very small (1.5 ha) site and the occurrence of several regionally important species indicate that periodically drained pond bottoms could be important anthropogenic habitats for terrestrial arthropods conservation.

4

Effects of spruce forest degradation on abundance and diversity of the biocenoses : Research synthesis

Dąbrowska-Prot E.

Polish Journal of Ecology

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1999

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Vol. 47, no 4

465-476

EN

This work presents results of the studies on responses of plant communities and ecologically diverse invertebrate communities to mountain spruce forest decline in the western part of Karkonosze Mts. (south-western Poland). It was examined how distribution and biodiversity and predatorprey relations of invertebrates (Araneae, Diptera, Protozoa) have been affected by fragmentation of the landscape composed of residues of old-growth spruce forests, young spruce stands and deforested areas.