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Forest roads used by commuting and foraging bats in edge and interior zones

Lesiński G., Olszewski A., Popczyk B.

Polish Journal of Ecology

2011

Vol. 59, nr 3

611-616

We hypothesized that the flight activity of bats in forests is higher in parts closer to edges due to the presence of species roosting in trees and foraging mostly outside as well as those coming to forage from outside. The aim of our study was to test this expectation using bat netting on roads in a forest belt 4-5 km wide in Kampinos National Park near Warsaw (central Poland). Tree stands were mostly coniferous. Ten full-night study sessions were done between the end of July and the beginning of September in the years 2007-2009. During each session, bats were netted at two sites situated in two zones designated as "edge" (100-500 m from forest edge) and "interior" (1750-2250 m from forest edge). The study revealed twelve species, among which Eptesicus serotinus (Schreber), Nyctalus noctula (Schreber) and Barbastella barbastellus (Schreber) were by far most abundant. Total bat abundance recorded at ten pairs of netting sites differed significantly between the edge zone (ca. 2.5 times higher numbers) and the interior zone. Among individual species, a statistically important difference was shown only for Plecotus auritus (L.), which was more abundant close to the forest edge, though a similar tendency was noted in other species, mostly E. serotinus. The frequency of each species in the bat assemblage as well as species diversity of bats flying along forest roads did not differ between the two zones.

The effect of food odour on food preference, activity and density of dung beetle Geotrupes stercorosus (Scriba, 1971) in a mixed coniferous forest

Plewińska B.

Polish Journal of Ecology

2007

Vol. 55, nr 3

495-509

The response of coprophagous dung beetles Geotrupes stercorosus (Scriba, 1791) to the additional food supply in the habitat was examined, as well as their food preference, the effect of food and the daily rhythm of activity, and population density. The study was conducted in the summer and early autumn periods in four years (1998-2002) in a mixed coniferous forest Leucobryo-Pinetum (Matuszkiewicz, 1962) located in central Poland (52 [degree] 20'N, 27 [degree] 25'E). The insects were captured in baited traps functioning as Barber's traps do. They were marked by clipping wing covers (based on the CMR technique). In total, about 31 000 individuals were caught and marked. It has been found that among faeces of different mammals, the faeces of forest rodents are the most attractive food for dung beetles.Food stimulates movements of beetles towards its source (foraging activity). The peak activity coincides with the afternoon hours (5.43 individuals per trap, on average, P [is less than or equal to] 0.0001 as compared with the other periods of the day and night). There were years with a high number of captures (11.9 individuals per trap per day) and a low searching activity, and years with a low number of captures (5.06 individuals per trapper day) and a high searching activity. To compare differences in the number of beetles captured in pitfall traps with their genuine numbers in the habitat, the method of square sampling was used for evaluating their density (1.13 x 10 [^3] individuals per ha). There were days when the locomotor activity of the dung beetles was low and days when the number of captured beetles exceeded several times their genuine density on the area of 1 ha.