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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Monitorování změn výskytu obojživelníků v Novohradských horách a jejich podhůří / Monitoring of changes in distribution of amphibians in Novohradské Mountains and their piedmont

ŽALUD, Štěpán January 2012 (has links)
The changes in the occurrence of amphibian were monitored in the region of Novohradske mountains and in its foothills in seasons 2009-2010. Observation was focused on the presence of 11 species of amphibian in 31 selected locations. The results confirmed a significant decrease in the frequency of the species: Smooth Newt (Lissotriton vulgaris), Alpine Newt (Mesotriton alpestris), Warty Newt (Triturus cristatus) and synklepton Pelophylax synklepton esculentus. A mild decrease by European Tree Frog (Hyla arborea) and Common Spadefood (Pelobates fuscus). The balanced condition was found out by Fired Bellied Toad (Bombina bombina) and Yellow Bellied Toad (Bombina variegata), Common Toad (Bufo bufo), Grass Frog (Rana temporaria), Moor Frog (Rana arvalis) and Agile Frog (Rana dalmatina). Species were determined according to morphological characters. Observed data were compared with results of surveys of monitored sites from years 1999-2004.
2

Cassidinae of Panama, part 1 (Coleoptera: Chrysomelidae) / Cassidinae of Panama, part 1 (Coleoptera: Chrysomelidae)

SEKERKA, Lukáš January 2009 (has links)
The study deals with taxonomy of Cassidinae of Panama and is based on extensive new material compared with the type specimens in various museums. Totally is listed 178 species of which 33 and two genera are described as new to science.
3

Utilização dos helmintos parasitos de Geophagus brasiliensis (Quoy & Gaimard, 1824) (Cichlidae; Perciformes) como indicadores ambientais / The use of helminthes parasites of Geophagus brasiliensis (Quoy & Gaimard, 1824) (Cichlidae; Perciformes) as environmental indicators

Madi, Rubens Riscala 25 May 2005 (has links)
Orientador: Marlene Tiduko Ueta / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Biologia / Made available in DSpace on 2018-08-04T12:58:43Z (GMT). No. of bitstreams: 1 Madi_RubensRiscala_D.pdf: 9621964 bytes, checksum: 62171358c6dd9c0bf0ceb26ed12fd16c (MD5) Previous issue date: 2005 / Resumo: Alguns parasitos de peixes podem ser utilizados como indicadores da qualidade e saúde ambiental. Por fazerem parte de uma complexa cadeia de relações os hospedeiros intermediários e paratênicos, geralmente pequenos e delicados, variam seus níveis populacionais conforme o tipo de poluente refletindo em alterações do parasitismo em peixes. A escolha de uma espécie de peixe como bio-indicador é fator fundamental para a correta utilização dessa ferramenta de análise ambienta!. Neste trabalho foram comparados os parasitismos do peixe Geophagus brasiliensis (Cichlidae, Perciformes) em dois reservatórios com diferentes níveis de influência antrópica e eutrofização. Foram verificados os helmintos parasitos cavitários, teciduais e de brânquias. Foram calculados os índices de diversidade de Simpson e de Shannon, o índice de uniformidade de HiII, os coeficientes de associação de Jaccard, de Dice e de Ochiai e as variações nas taxas de prevalência e intensidade média de infecção. Para o modelo adotado, os índices que melhor refletiram a influência do tipo de ambiente e as variações ocasionadas dentro destes ambientes foram a prevalência e a intensidade média de infecção. Os resultados obtidos com os índices de associação demonstraram a independência das relações entre os helmintos parasitos encontrados. Através dos cálculos das prevalências e intensidades médias de infecção os parasitos podem ser utilizados como indicadores de alterações ambientais (metacercárias de Clinostomum sp. e Ancyrocephalinae) e indicadores faunísticos em ambientes distintos (metacestódeos de Proteocephalidea e Cyclophyllidea e o nematódeo Procamallanus peraccuratus). Foram encontradas também larvas de Contracaecum sp. cujos resultados não foram suficientes para uma conclusão sobre o seu papel como indicador ambienta! / Abstract: Some parasites of fishes can be utilized as indicators of water quality and environmental health. As intermediate and paratenic hosts, generally small and delicate, belonging to a complex relationship chain, they must vary their population in accordance to the variety of pollutant, reflects in alteration of parasitism in fishes. The choice of the fish specie as bio-indicator is a essential factor to a correct utilization as toei of environmental analysis. In this work, it was compared the parasitism of Geophagus brasiliensis (Cichlidae, Perciformes) in two rese rvo i r with different levels os antropic influence and eutrophication. The cavities, tissular and gill helminths parasites were verified. The Simpson's and Shannon's diversity indices, the HiII's evenness index, the Jaccard's, Dice's and Ochiai's interespecific association indices and the variations in prevalence and mean intensity of infection were calculated. To the model adopted the indices that better reflected the influence of environmental type and the variations that occurred inside the environment were the prevalence and intensity of infection. The interespecific association indices demonstrate the independence of relations among the helminths parasites. Through the estimate of prevalence and mean intensity of infection indices, the parasites can be utilized as indicators of environmental changes (metacercariae of Clinostomum sp. and Ancyrocephalinae) and faunistics indicators of distincts environments (metacestodes of Proteocephalidea and Cyclophyllidea and the nematode Procamallanus peraccuratus). Larvae of Contracaecum sp. were also found, whose resulting were not sufficient to a conclusion about its function as environmental indicator / Doutorado / Parasitologia / Doutor em Parasitologia
4

Proměna fauny denních motýlů na střední škále: Situace v Jihočeském kraji / Transformation of butterfly fauna on a middle scale: Situation in the South Bohemian Region.

ZAPLETAL, Michal January 2011 (has links)
This thesis summarises historical and recent information on the distribution of butterflies in South Bohemian region, based on 130 records from literature, collections and recording reports, amassed during Mapping of Czech Republic butterflies. Historical and present distributions of each of 130 butterfly species found in their region are displayed on distribution maps. Out of the 130 species, 42,1 % is already extinct, while 24,1 % is threatened to some extend. Comparison with the situation in entire Czech Republic reveals a higher rate of extinctions, which is probably a function of smaller total area. Compared with the Czech Republic total, xerophilous species suffered higher losses in South Bohemia, whereas species of mesic habitats are relatively less endangered and for peat bogs specialists, the region represents a major refugium. Priorities for further research and active conservation measures are discussed.

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