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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Compensatory schemes for the support of insect populations in open landscape
 Jor, Tomáš ; Šípek, Petr (advisor) ; Kadlec, Tomáš (referee)
Insect biodiversity of hay meadows seemingly decreased during the last fifty years due to the land abandonment and radical intensification of agriculture. In contrast to the traditional mowing regime and techniques, nowadays farmers are able to harvest hay from large areas of grasslands with modern machine mowing in a very short time period. This results in a uniform vegetation structure with low food resources for the vast majority of insect species bound to the hay meadows. In order to contradict these trends the European agro-environmental schemes were established. In the Czech Republic these schemes determine specific time and a homogenous regime of mowing. In this thesis we present the results of the study of the effect of uncut grass strips as a compensation measure to promote biodiversity on commercial hay meadows Pitfall traps, yellow pan traps, window traps and individual transects walks were used for monitoring diversity and biomass of intercepted insects and arachnids on 21 sites located in the Český ráj region. The statistical analyses show a (i) significant positive effect of uncut strips on insect biomass and species richness on the treatment sites (Multidimensional analysis (RDA) showed (iv) a positive significant effect of uncut strips on species composition for all studied insect...
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The efect of uncut grass strips on the functional diversity of selected meadow insects communities
 Kapr, Jan ; Šípek, Petr (advisor) ; Harabiš, Filip (referee)
This thesis compares the species diversity and the functional diversity of three ecologically important insect taxa (Orthoptera, Heteroptera and Hymenoptera:Aculeata) between production meadows, where the uncut grass strips are left and the meadows mown in the conventional way. Leaving the uncut strips of vegetation is an example of the agri-environmental schemes which were introduced to try to mitigate the negative impact of intensive agriculture on the biodiversity of the production grassland. Here I present part of the results of a four-year study focused on the response of insect abundance and diversity to the meadow management. Based on the recorded insect species diversity, the ecological traits of the insect species were analysed. The functional diversity analysis helps to better understand the ecological relationships in production meadow communities and to evaluate the importance of this agri-environmental scheme for various insect taxonomical and functional groups. Key words: uncut grass strips, agro-envi schemes, functional diversity, production meadows, insect decline
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