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Reintroduction of butterflies (Lepidoptera)
Štochlová, Tereza ; Sedláček, Ondřej (advisor) ; Straka, Jakub (referee)
The thesis deals with one of the active means of conservation - reintroduction. By this ap- proach, organisms are released in their historical range from which they have disappeared. Re- introductions typically concern vertebrates, that is, however, why this thesis focuses on a group of invertebrates - butterflies (Rhopalocera). The main aim of this work is to carry out a research of previous experiments, evaluate used methods and discover the best way to proceed with reintroduction of butterflies. This process contains many important steps. Firstly, a suitable species must be chosen, that means one that is declining and has limited dispersal abilities. Secondly, an appropriate habitat for releasing organisms must be found - host plants ought to be sufficiently abundant and the area big enough. If the habitat quality is not satisfactory, it can be achieved through management, most commonly by planting host plants, mowing or grazing. Next step is choosing the right donor population. It should be stable, genetically variable, and genetically and ecologically related to the original extinct population. After transfer and release of sufficient number of organisms, it is crucial to carry out a long-term monitoring of the newly formed population and to modify its management when necessary. All methods...
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Preferences of the main groups of pollinators for the functional floral traits
Malá, Karolína ; Janovský, Zdeněk (advisor) ; Hadrava, Jiří (referee)
This bachelor thesis summarizes the preferences of the main functional groups of pollinators towards floral traits of plants. Due to coevolution and mutual selection pressures, these two life forms have begun to adapt to each other and develop traits on which the future of their life depends. The plant seeks to attract its pollinators, thus ensuring efficient pollen transfer or reproduction for its species. Attractants are used to motivate visitors to its flowers. These attractants provide pollinators with either direct rewards (food, shelter, brood) or rewards in the form of sensory perceptions (colour, scent, morphology). Recently, it has become apparent that flower colour, morphology and the type of food reward offered by the flower have the greatest influence on pollinator choice. Based on preferences towards attractants, we can organize several functional groups whose representatives have the same or similar choice preferences. Key words Pollination syndromes, pollinator, selection pressures, plant traits, coevolution, preferences, fidelity, diptera, coleoptera, lepidoptera, hymenoptera, birds, colour, morphology, rewards
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Comparison of reproductive parameters of Central European populations of the critically endangered Hermit butterfly (Chazara briseis)
Štochlová, Tereza ; Sedláček, Ondřej (advisor) ; Kadlec, Tomáš (referee)
The Hermit butterfly Chazara briseis is a species from the family Nymphalidae, inhabiting mostly short-stemmed dry steppes. In Central Europe, it is critically endangered. It is therefore currently the subject of many conservation activities, including reintroductions. In such translocations of individuals, it is important that the native and source populations be as closely related as possible in all respects. Therefore, individuals of two forms of this species, Ch. briseis pannonica (Austrian population) and Ch. briseis bataia (Czech population) were bred and their reproductive characteristics were recorded and the differences between the two forms were observed. During two seasons 5 Austrian and 8 Czech females were successfully bred. The Austrian and Czech populations differed mainly in the timing of adult hatching and the beginning of the laying of eggs by females - Austrian individuals are phenologically shifted to one week to 14 days earlier. Individual populations of the same species may also differ from each other in the presence of Wolbachia pipientis. This bacterium can affect the sex ratio in a population as well as the reproduction behavior of individuals. There was a suspicion of its presence in the Czech population. Therefore, a part of the Czech population was treated with...
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Minující hmyz na dřevinách ve vybraných parcích v Brně a okolí
Flajzarová, Andrea
In the three parks in Brno and its surroundings (arboretum of the Mendel university in Brno, the arboretum Křtiny and the forest park Kalvárie in Bučovice) the diversity of mining butterflies on ornamental trees was monitored in 2017 – 2018. The aim of the final thesis was to find out the spectrum of the mining butterflies, to determine a differences in species composition of the mining butterflies on the individual study areas and measure the degree of attack in host trees. A total of 47 species of mining butterflies were found. The most species were found in the arboretum of the Mendel university (31 species), the arboretum Křtiny (19 species) and at least species were found in the forest park Kalvárie (15 species). The most species who were found belong to the family of Gracillariidae (21 species) and Nepticulidae (20 species), the less species was from the family Tischeridae (2 species), Yponomeutidae (1 species) and Coleophoridae (1 species). The most abundant were the species of lithocolletinae, especially Cameraria ohridella on Aesculus hippocastanum, Phyllonorycter platani on Platanus acerifolia and Phyllonorycter issikii on genus Tilia. Against these species should be targeted a possible protection of host trees. The most species of mining butterflies were found on the wooden plant: Quercus robur, Fagus sylvatica, Quercus faginea, Quercus pubescens, Carpinus betulus a Ulmus glabra.
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Sezónní dynamika a početnost nesytky jabloňové a nesytky rybízové v okolí Lysic
Pavlíčková, Kristýna
The pheromone traps for monitoring of seasonal dynamic and abundance of apple clearwing (Synanthedon myopaeformis Borkhausen, 1789) and currant clearwing moth (Synanthedon tipuliformis Clerk, 1759) has been used near the town Lysice from May to August of the year 2017. During the experiment, their occurrence was compared in intensively (Lysice) and extensively (Lažany) cultivated areas with currants and orchards of apple trees, where older and younger plants are cultivated. In Lažany the flight activity of the males was studied also during the day. In the winter of 2017 and 2018 the occurrence of currant clearwing moth caterpillars was evaluated in the shoots of the currant. At both localities 223 individuals of apple clearwings and 281 individuals of currant clearwings moth were caught. The greater abundance both species was found in intensively cultivated areas on older and damaged host plants. Males of apple clearwing flew to the pheromone traps from 26th May to 9th August, they were caught in the highest abundance around 20th July. Males of currant clearwing moth flew to the pheromone traps from 31st May to 28th July, with a maximum abundance around of 10th July, The adults of both species were intercepted from 9:00 a.m. to 7:00 p.m. The males of apple clearwing moth were caught in the highest abundance at 11:00 a.m. and at 1:00 p.m. The males of currant clearwing moth were caught in the high abundance at 12:00 a.m. During the winter control only one living caterpillar of currant clearwing moth was found. On the plants no damage caused by the examined species clearwings was found, and therefore no pest control is required.
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How universal are reserve design rules? A test using butterflies and their life history traits
BARTOŇOVÁ, Alena
This thesis uses butterfly species lists for 125 Czech National Nature Reserves and Monuments to test the validity of generally agreed 'reserve design rules' using multivariate ordination analyses. We used analyses of butterfly life history traits to seek for biological mechanisms responsible for butterfly community responses to geometric and heterogeneity characteristics of the reserves. We found that different design characteristics are important for individual species, depending on their life histories.
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Reintroduction of butterflies (Lepidoptera)
Štochlová, Tereza ; Sedláček, Ondřej (advisor) ; Straka, Jakub (referee)
The thesis deals with one of the active means of conservation - reintroduction. By this ap- proach, organisms are released in their historical range from which they have disappeared. Re- introductions typically concern vertebrates, that is, however, why this thesis focuses on a group of invertebrates - butterflies (Rhopalocera). The main aim of this work is to carry out a research of previous experiments, evaluate used methods and discover the best way to proceed with reintroduction of butterflies. This process contains many important steps. Firstly, a suitable species must be chosen, that means one that is declining and has limited dispersal abilities. Secondly, an appropriate habitat for releasing organisms must be found - host plants ought to be sufficiently abundant and the area big enough. If the habitat quality is not satisfactory, it can be achieved through management, most commonly by planting host plants, mowing or grazing. Next step is choosing the right donor population. It should be stable, genetically variable, and genetically and ecologically related to the original extinct population. After transfer and release of sufficient number of organisms, it is crucial to carry out a long-term monitoring of the newly formed population and to modify its management when necessary. All methods...
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