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The numerical structure of lumbricidae populations in some terrestrial ecosystems of Cândeşti piedmont (South Romania, Argeş county)

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Author(s): Gheorghiţa BRÎNZEA

Journal: Analele Universitatii din Oradea, Fascicula Biologie
ISSN 1224-5119

Volume: TOM XVII;
Issue: 1;
Start page: 49;
Date: 2010;
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Keywords: lumbricidae | numerical density | relative abundance | forest ecosystem

ABSTRACT
The present work establishes the species composition, numerical density and relative abundance of lumbricide populations in the soils of some of the forest ecosystems. The three ecosystems are: the mixture of beech and oak, spruce and grassland. These ecosystems are located into the high and middle hills of the Southern Carpathians, namely in the Candeşti Piedmont. Among the three types of studied ecosystems, differences have been reported, considering the parameters described above. Specific relief unit is the slope, plateau also being present. The dominant exposure of the slopes is partly sunny, with a bending curve that does not exceed 25-30 degrees and an altitude ranging between 340-700 m. Representative geological formations consist of alternating clay, coarse sand, gravel and boulders. The relative abundance revealed Aporrectodea rosea rosea andOctolasion lacteum species with the highest percentages in all stations. Aporrectodea rosea rosea species had the highest percentageof relative abundance in the spruce ecosystem in March. However, Octolasion lacteum species was best represented in the specific outline, in all months. Relative and numerical abundance and density of lumbricidae are influenced by several factors of biotope, among which pH and humidity are the most important.
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