National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Nová metoda vzorkování fytofilních bezobratlých ve vynořené litorální vegetaci
Sychra, Jan ; Adámek, Zdeněk
The aim of the study was to design the sampling method for collection of phytophilous macroinvertebrates associated with submersed parts of hard emergent littoral vegetation in still waters, which will join technical sampler unpretentiousness, sampling simplicity and maximal quantitative accuracy. For these purposes, we developed a modified Gerking´s frame box sampler with movable cutter for sampling of animals in the littoral macrophyte beds and a new type of core sampler for collection of animals inhabiting the root zone of emergent plant beds. Both sampling devices are suitable for studies targeted on macroinvertebrates monitoring. The comparative sampling using frame box sampler and benthos handnet was performed in the littoral of three carp ponds. The sampling procedure utilizing the frame sampler was more labour demanding however it enabled significantly (P < 0.05) more efficient collection of slowly moving or sedentary animals.
Spatial patterns of vegetation changes in nature reserve Ruda (CHKO Třeboňsko) during last 20 years
Navrátil, J. ; Navrátilová, Jana
Changes in vegetation were revealed with comparison of two vegetation maps from the years 1985 and 2004 in GIS. Vegetation types were defined on the basis of their species composition and abundance pattern in 1985 and were supervised with the same methodology in 2004. The relative cover of the vegetation types was compared in these two periods. We have detected the biggest decrease in land cover of open water bodies and the biggest increase in shrub vegetation such as mire willow scrub and those with Betula pendula in tree layer.

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