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Determinants of individual distributions in an island population of the bank vole

100%

Bujalska G., Lukyanov O. A., Mieszkowska D.

Polish Ecological Studies

1994

tom 20

nr 3-4

Spider assemblages of hummocks and hollows in a primeval alder carr in the Białowieza National Park – effect of vegetation structure and soil humidity

72%

Stanska M., Stanski T., Gladzka A., Bartos M.

Polish Journal of Ecology

2016

tom 64

nr 4

We studied the species richness, diversity, abundance and guild composition of spider assemblages on the hummocks and in the hollows of the alder carr in the Białowieża National Park. We also assessed the effect of vegetation structure and soil humidity on spiders settled in these two microhabitats. The spiders were collected from 10 May until 27 October 2001 by pitfall trapping. The main factor which differed between the hummocks and the hollows was soil humidity. In the case of vegetation cover we found some differences between the microhabitats but it was particularly evident in the case of litter, which was higher on the hummocks. Spider species diversity was significantly higher on the hummocks than in the hollows, but the number of individuals captured in both microhabitats was similar. The collected spiders belonged to six guilds and the proportion of spider individuals in particular guilds was significantly different between the hummocks and the hollows. The most abundant guild in both microhabitats was ‘ground hunters’ and the most numerous species was Piratula hygrophila. Our analyses showed that soil humidity positively affected the number of spider species and the number of individuals. Sampling date strongly influenced the number of collected species and spider individuals. Vegetation and litter cover did not have a significant impact on the spider assemblages. Our findings suggest that research conducted only on hummocks in the alder carr does not reveal the real structure of spider assemblages.

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Gap regeneration in near-natural European beech forest stands in Central Bohemia - the role of heterogeneity and micro-habitat factors

72%

Bilek L., Remes J., Podrazsky V., Rozenbergar D., Diaci J., Zahradnik D.

Dendrobiology

2014

tom 71

Gap regeneration in a European beech (Fagus sylvatica L.) forest reserve was analyzed in relation to within-gap resource heterogeneity and ground vegetation competition. The study was carried out in two one-hectare permanent research plots (PRP) which included five smaller research plots (RP) encompassing two large gaps (500–700 m2), two small gaps (300–400 m2), and location under canopy. The coverage of woody regeneration, ground vegetation, dead wood, seedling density in eight height classes, characteristics of dominant trees of the beech regeneration, and the total thickness of holorganic horizons were measured. Soil moisture and light conditions were also assessed in selected sample plots. The relative direct and diffuse light was estimated by hemispherical photography. Small gaps showed both the highest cover of tree regeneration and the highest density of individuals per hectare. Slightly less regeneration was recorded in large gaps, while under closed canopy, regeneration densities were 5–10 times lower than in small gaps. Beech regeneration cover and the size (diameter and height) of dominant beech seedlings were positively related to relative diffuse light and negatively related to ground vegetation cover. The latter was positively related to diffuse light and soil moisture content. A pronounced statistically significant contrast in the cover and size of beech regeneration in relation to micro-site conditions (diffuse light, cover of graminoids) was only confirmed between sample plots located below canopy cover and those within gaps. Graminoids, in particular Calamagrostis epigejos L., occurred mainly in the large gap centre and along the southernmost edge of the large gap, increasing competition for resources here. The cumulative cover of ground vegetation and regeneration was relatively low (9–56%) compared with more mesic natural beech forests. The indicated negative influence of direct light at the northern gap edge suggests that extension of gaps on comparable sites in managed forest should not proceed in this direction.

Ograniczanie wyników

1 Dendrobiology

1 Polish Ecological Studies

1 Polish Journal of Ecology

1 Bartos M.

1 Bilek L.

1 Bujalska G.

1 Diaci J.

1 Gladzka A.

1 Lukyanov O. A.

1 Mieszkowska D.

1 Podrazsky V.

1 Remes J.

1 Rozenbergar D.

1 Stanska M.

1 Stanski T.

1 Zahradnik D.

1 2016

1 2014

1 1994

Wyniki wyszukiwania

Determinants of individual distributions in an island population of the bank vole

Spider assemblages of hummocks and hollows in a primeval alder carr in the Białowieza National Park – effect of vegetation structure and soil humidity

Gap regeneration in near-natural European beech forest stands in Central Bohemia - the role of heterogeneity and micro-habitat factors