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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

Contribuição ao estudo da Taxonomia dos Dictyopharidae (Insecta: Hemiptera: Fulgoromorpha) com ocorrência no Estado de Minas Gerais, Brasil / Contribution to the study of the Taxonomy of Dictyopharidae (Insecta: Hemiptera: Fulgoromorpha) from Minas Gerais State, Brasil

Baptista, Marcelo da Silva 30 July 2002 (has links)
Submitted by Reginaldo Soares de Freitas (reginaldo.freitas@ufv.br) on 2017-03-09T12:22:54Z No. of bitstreams: 1 texto completo.pdf: 3695790 bytes, checksum: 480d2210211917e01dfb48556a3bc314 (MD5) / Made available in DSpace on 2017-03-09T12:22:54Z (GMT). No. of bitstreams: 1 texto completo.pdf: 3695790 bytes, checksum: 480d2210211917e01dfb48556a3bc314 (MD5) Previous issue date: 2002-07-30 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Com base em exemplares depositados em coleções entomológicas de cinco instituições nacionais, foi realizado um estudo faunístico e taxonômico, a respeito dos Dictyopharidae do Estado de Minas Gerais, onde, até o presente momento, estavam registrados apenas sete gêneros e onze espécies. A partir do estudo, foi realizada a descrição de um novo gênero, Pukuakanga gen. nov., e de duas espécies novas de Melicharoptera Metcalf, 1938 provenientes do município de Viçosa, M. vicosa sp. nov. e M. spinae sp. nov. Paralappida limbativentris Stål, 1862 é redescrita com base em exemplares provenientes dos estados do Rio de Janeiro e de Minas Gerais, e pela primeira vez as genitálias do macho e da fêmea do gênero são descritas. Ainda com base em coletas realizadas com armadilha luminosa no município de Viçosa, em uma área de Mata Atlântica conhecida como Mata do Paraíso, foram obtidos dez gêneros e vinte espécies de Dictyopharidae, sendo que destas onze ainda não conhecidas. Os gêneros Lappida Amyot & Serville, 1843, Melicharoptera Metcalf, 1938, Paralappida Melichar, 1912, Pteroplegma Melichar, 1912 e Retiala Fennah, 1944 são registrados pela primeira vez para Minas Gerais, assim como são acrescidos de registros os gêneros Hyalodictyon Fennah, 1944, Nersia Stål, 1862 e Taosa Distant, 1906 para o estado. Ao todo, representantes de Dictyopharidae são registrados para trinta municípios de Minas Gerais, os quais foram caracterizados conforme sua localização e vegetação natural. / A faunistic and taxonomic research regarding the fauna of Dictyopharidae from the state of Minas Gerais, where until now only seven genera and eleven species were registered, was accomplished based on material deposited in entomological collections from five Brazilian institutions. Herein, a new genus, Pukuakanga gen. nov., obtained from several localities of Minas Gerais, and two new species of Melicharoptera Metcalf, 1938, collected in the region of Viçosa, M. vicosa sp.nov., and M. spinae sp.nov., are described. Paralappida limbativentris Stål, 1862 is redescribed based on material from the states of Rio de Janeiro and Minas Gerais, and for the first time the male and female genitalia of the genus are described. Samples obtained from light trap in Mata do Paraíso, a rain forest Mata Atlântica fragment located in Viçosa, showed the presence of ten genera and twenty species of Dictyopharidae, of which eleven species are unknown. The genera Lappida Amyot & Serville, 1843, Melicharoptera Metcalf, 1938, Paralappida Melichar, 1912, Pteroplegma Melichar, 1912, and Retiala Fennah, 1944 are registered for the first time from Minas Gerais, and additional records of the genera Hyalodictyon Fennah, 1944, Nersia Stål, 1862 and Taosa Distant, 1906 are provided for the state. Dictyopharidae was found in thirty municipal districts of Minas Gerais, which were characterized according to their location and natural vegetation.
2

Revisão taxonômica e análise filogenética de Scopogonalia Young, 1977 com a descrição de uma espécie nova do grupo externo

Leal, Afonso henrique 29 August 2014 (has links)
Submitted by Maike Costa (maiksebas@gmail.com) on 2016-06-02T12:49:23Z No. of bitstreams: 1 arquivo total.pdf: 15934272 bytes, checksum: bb34940039880cf1364a02557769fcf1 (MD5) / Made available in DSpace on 2016-06-02T12:49:23Z (GMT). No. of bitstreams: 1 arquivo total.pdf: 15934272 bytes, checksum: bb34940039880cf1364a02557769fcf1 (MD5) Previous issue date: 2014-08-29 / The genus Scopogonalia Young belongs to the family Cicadellidae, subfamily Cicadellinae and tribe Cicadellini and contains 11 species, all recorded in South America: S. subolivacea (Stål) (type species), S. interruptula (Osborn), S. echinura Young, S. golbachi Young, S. nargena Young, S. oglobini Young, S. paula Young, S. penicula Young, S. altmanni Cavichioli, S. plaumanni Cavichioli, and S. splendida Cavichioli. In this work, Scopogonalia and two of its species are redescribed, as well as six new ones are described, which of them five from specimens from Brazil and one from Argentina. Moreover a phylogenetic analysis of the genus is conducted to test its monophyly and propose a hypothesis of phylogenetic relationship between them. The terminal taxa of the phylogenetic analysis are all species of Scopogonalia and six outgroup taxa: Tretogonia cribrata Melichar, Cyclogonia caeligutata Mejdalani & Nessimian, Rotigonalia larissae Cavichioli, Rotigonalia olivacea Cavichioli, Plerogonalia rudicula (Jacobi), and a new species of Rotigonalia which is also described. A taxonomic key of Scopogonalia and another of Rotigonalia were elaborated. 59 morphological and color pattern characters were used, identified based on topographic criteria, which of them the multistate were coded as unordered and the uninformative autopomorphic were included. The maximum parsimony analysis was conducted with the software TNT, resulting in 8 most parsimonious trees, with length = 137, consistency index (CI) = 0.47 (excluding uninformative characters), and retention index (RI) = 0.72. In all of them, Scopogonalia is monophyletic, although with low support, having as unambiguous sinapomorphies the reversion of the clypeus from swollen to not swollen, the first condition present in Rotigonalia and Plerogonalia, and the opening of the bases of the median and internal anteapical cell of the forewings. An implied weighting analysis lead to three trees, all included in the original ones, which the strict consensus shows little conflict. One of the clades supports a previous connection between the core area of the Cerrado biome and savanna enclaves in tha Amazon and Atlantic Forest biomes. Another one strengthens a proposed relationship between the central and south blocks of areas of endeminsm of the Atlantic Forest. / O gênero Scopogonalia Young pertence à família Cicadellidae, subfamília Cicadellinae e tribo Cicadellini e contém 11 espécies, todas registradas na América do Sul: S. subolivacea (Stål) (espécie-tipo), S. interruptula (Osborn), S. echinura Young, S. golbachi Young, S. nargena Young, S. oglobini Young, S. paula Young, S. penicula Young, S. altmanni Cavichioli, S. plaumanni Cavichioli e S. splendida Cavichioli. Neste trabalho, Scopogonalia e duas de duas espécies são redescritas, bem como são descritas seis espécies novas, sendo cinco a partir de espécimes do Brasil e uma da Argentina. Também é feita uma análise filogenética do gênero, para testar seu monofiletismo e elaborar uma hipótese de relacionamento filogenético entre elas. Como táxons terminais da análise filogenética estão as espécies de Scopogonalia e mais seis espécies no grupo externo: Tretogonia cribrata Melichar, Cyclogonia caeligutata Mejdalani & Nessimian, Rotigonalia larissae Cavichioli, Rotigonalia olivacea Cavichioli, Plerogonalia rudicula (Jacobi), e uma espécie nova de Rotigonalia Young que também é descrita. Uma chave taxonômica de Scopogonalia e outra de Rotigonalia foram elaboradas. Foram usados 59 caracteres morfológicos e de padrão de cor identificados com base em critérios topográficos, dentre os quais os multiestado foram codificados como não-ordenados e os autapomórficos não-informativos foram incluídos. A análise de parcimônia máxima foi conduzida no programa TNT, resultando em 8 árvores mais parcimoniosas, com comprimento = 137, índice de consistência (IC) = 0,47 (excluindo caracteres não-informativos) e índice de retenção (RI) = 0,72. Em todas, Scopogonalia é monofilético, porém com baixo suporte, tendo como sinapomorfias não-ambíguas a reversão do clípeo inflado para não-inflado, primeira condição presente em Rotigonalia e Plerogonalia, e a abertura da base das células anteapicais mediana e interna das asas anteriores. Uma análise com pesagem implicada chegou a três árvores, todas incluídas entre as originais, cujo consenso estrito mostra pouco conflito. Um dos clados suporta uma ligação pretérita entre a área núcleo do bioma Cerrado e enclaves de savana nos biomas Amazônia e Mata Atlântica. Outro sustenta uma relação proposta entre os blocos central e sul de áreas de endemismo da Mata Atlântica.
3

Comportement de Scaphoideus titanus, conséquences spatiales et démographiques / Scaphoideus titanus behaviour, spatial and demographic consequences

Chuche, Julien 08 December 2010 (has links)
La Flavescence dorée est une maladie à phytoplasme incurable qui affecte la vigne. Cette pathologie est uniquement transmise de plante à plante par la cicadelle vectrice Scaphoideus titanus. Malgré l'importance de cette maladie, peu d'études ont été menées sur le vecteur. Ce travail de thèse vise à apporter des connaissances sur la biologie et l'écologie de S. titanus mais aussi de manière plus générale sur l'écologie des insectes phytophages. Trois grands thèmes ont été abordés dans ce mémoire : i) les relations entre l'insecte et son environnement à travers l'influence des températures hivernales sur les œufs en diapause, ii) les relations de l'insecte avec sa plante hôte en examinant l'attractivité de cette dernière et le comportement alimentaire du vecteur, iii) les interactions entre congénères par l'étude du comportement d'agrégation des larves. Les résultats obtenus indiquent que 1) des températures froides ne sont pas indispensables à la levée de diapause mais affectent la protandrie en régulant le sex-ratio opérationnel, 2) l'attractivité de la plante hôte est en grande partie liée à sa couleur et il existe des différences de comportement en fonction du stade de développement, 3) les mâles et les femelles n'ont pas le même comportement alimentaire, ce qui pourrait expliquer leur différentes capacités de vection, 4) l'agrégation des larves ne semble pas due à un recrutement actif de leur part et pourrait contribuer à un transfert horizontal de phytoplasme d'insecte à insecte via la plante. A terme, ces connaissances pourront contribuer à l'élaboration de pistes alternatives à la lutte chimique actuelle contre cette cicadelle dans le cadre d'une réduction des intrants. / The Flavescence dorée is an incurable phytoplasma disease of grapevine. This pathology is exclusively transmitted from plant to plant by the leafhopper vector Scaphoideus titanus. Despite the importance of this disease, few studies have been conducted on the vector. This thesis aims to provide knowledge on the biology and ecology of S. titanus but also more broadly on the ecology of phytophagous insects. Three major themes were addressed in this thesis: i) the relationships between the insect and its environment through the influence of winter temperatures on diapausing eggs, ii) the relationships of the insect with its host plant by examining the attractiveness of the plant and the feeding behaviour of the vector, iii) interactions between congeners in the study of the aggregative behaviour of larvae. Our results indicate that 1) cold temperatures are not essential to break the diapause but contribute to protandry through operational sex ratio regulation, 2) the attractiveness of the host plant is largely due to its colour and different instars exhibit differences in behavioural choices, 3) males and females have different feeding behaviour which may explain their different efficiencies at vection, 4) the aggregation of larvae did not seem to result from active recruitment and could contribute to horizontal insect to insect transfer of phytoplasma through the plant. Such knowledge can contribute to the development of alternative S. titanus pest management techniques.
4

Long-term development of different grassland insect communities in Central Europe since the 1950s / Langfristige Entwicklung verschiedener Insektengemeinschaften der Grasflächen Mitteleuropas seit den 1950er Jahren

Schuch, Sebastian 14 July 2011 (has links)
No description available.
5

The Impact of Mowing and Flooding on the Diversity of Arthropods in Floodplain Grassland Habitats of the Lower Oder Valley National Park, Germany / Auswirkungen von Mahd und Überflutung auf die Arthropodendiversität der Auewiesen des Nationalparks Unteres Odertal

Rothenbücher, Judith 27 January 2005 (has links)
No description available.

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