National Repository of Grey Literature 19 records found  1 - 10next  jump to record: Search took 0.01 seconds. 
Recent recovery of acidified lakes in the Bohemian Forest
Vrba, Jaroslav ; Fott, J. ; Kopáček, Jiří ; Kohout, L.
In some of the eight glacial lakes in the Bohemian Forest we have observed first signs of zooplankton recovery from acidity. The recovery has followed a drop in atmospheric sulphur and nitrogen deposition and consequent reversal in water chemistry of the lakes during the last decade. At present, stable populations of Ceriodaphnia quadrangula have returned to Lake Černé and Prášilské, and two circumneutral rotifers have recently occurred in the lakes with positive alkalinity: Laka, Großer and Kleiner Arbersee. Moreover, in the mesotrophic, strongly acidified Lake Plešné, we documented increase in both phytoplankton and planktonic rotifers during the 1990s. A statistical comparison of seasonal data showed a significant increase in pH, a significant drop in total reactive aluminium, a significant increase in chlorophyll a concentration as well as in summer abundance of planktonic rotifers.
Testing of the soil water retention capacity
Lichner, Ľ. ; Šír, Miloslav ; Tesař, Miroslav
Soil water retention capacity plays very important role in both the soil water regime and runoff formation. Two alternating phases of the soil water regime - the percolation phase and the accumulation phase - can be met.
Influence of vegetation cover on water and thermal regime of three watersheds in the Bohemian Forest
Tesař, Miroslav ; Šír, Miloslav ; Zelenková, E.
The air temperature (5 and 200 cm above the soil surface), the soil temperature (15 and 60 cm below the soil surface), precipitation and runoff are continuously measured on three stands differing in the vegetation cover: (1) the clearing covered by herbs, (2) the mature spruce forest, and (3) dead spruce forest with a herb undergrowth.
Runoff formation in a small mountaineous watershed
Bayer, T. ; Tesař, Miroslav ; Šír, Miloslav
The qestion is solved how the outflow of water from the soil into the transport collector bears with the discharge at the closure profile of a small forest catchment in the course of a vegetation season. In connection with this phenomena we investigate how much is such catchment homogenous.
Deposited precipitation in the Bohemian Forest
Tesař, Miroslav ; Šír, Miloslav ; Fottová, D.
Contribution deals with an observation and evaluation of occult precipitation in the Bohemian Forest (=Sumava Mts.). Although occult precipitation is less important type of the wet deposition from the quantitative point of view, this so-called horizontal precipitation represents important input of delivered matter into many mountainous and urban areas.
Climatic anomaly 1992-1996 in the Liz catchment in the Bohemian forest as a consequence of Pinatubo eruption in 1991
Šír, Miloslav ; Tesař, Miroslav ; Lichner, Ľ.
Hydrologic cycle in the Liz catchment is described with an anomaly in the vegetation seasons 1992-1996.
Neuropteroidea and Mecoptera of the Bohemian Forest
Zelený, Jiří
General information is given on the current status of knowledge of Neuropteroidea and Mecoptera in the Czech Bohemian Forest (Šumava Mts.), especially in peatbogs. In the Bohemian Forest, 2 species Megaloptera, 6 species of Raphidioptera, 48 species of Neuroptera (Coniopterygidae 10 species, Osmylidae 1 species, Sisyridae 2 species, Hemerobiidae 22 species, Chrysopidae 12 species and Myrmeleontidae 1 species) and 4 species of Mecoptera are known. The most common species are: Hemerobius pini, Conwentzia pineticola, Coniopteryx pygmaea Wesmaelius quadrifasciatus and Chrysoperla carnea.The species importatnt for the nature conservation and biological diversity are: Phaeostigma major, Puncha ratzeburgi, Aleuropteryx loewii, Coniopteryx esbenpeterseni, Parasemidalis fuscipennis, Osmylus fulvicephalus, Sisyra terminalis, Wesmaelius ravus, Micromus lanosus, Sympherobius pellucidus a Myrmeleon formicarius.
Updated list of stoneflies (Insecta, Plecoptera) of the Šumava National Park and Protected Landscape Area with regard to their species protection
Soldán, Tomáš
Update list of Plecoptera of the area in question consists of 75 species,18 genera and 7 families of the order including 5 species the txonomic status of which is unclear and respective historical records seem to be doubtful. Based on recent data,5 species, namely Brachyptera monilicornis (Pictet, 1841), Capnopsis schilleri (Rostock, 1892),Rhabdiopteryx acuminata Klapálek,1905,Nemoura sciurus Aubert, 1949 a Nemoura cf. babiagorensis Sowa,1964,are recorded from the Bohemian part of the mountains for the first time. Long-term data originating from the 1950´s of the past century enable to evaluate the status from their protection point of view (red list):3 species are extinct within the whole Czech Republic,5 species are extinct or missing in the Bohemian Forest (=Šumava Mts.) for more then 20 yearch,2 are critically endangered,6 endangered,7 vulnerable and 8 species are near threatened. Further 6 species show data deficiency and remaining 36 species still do not require any treatment.
Bark beetles (Scolytidae, Coleoptera) on spruce in the Bohemian Forest
Zelený, Jiří ; Doležal, Petr
The article summarized part of data, that were obtained during 6 years lasting research focused on bark beetles and their natural enemies in the Bohemian Forest (Šumava Mts). 26 species of bark beetles were collected from spruce samples that were brought from Modrava, Srní, Kvilda, Borová Lada etc. Despite many abundant pest species like Ips typographus, Ips amitinus, Pityogenes chalcographus a Polygraphus polygraphus, also three uncommon species were collected: Pityogenes conjunctus, Pityophthorus micrographus a Xyloterus laeve. These three species may have importance for nature conservation.

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