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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

REVISION OF THE GENUS PHRENAPATES GRAY 1832 AND A PRELIMINARY STUDY OF THE SUBTRIBAL LIMITS OF THE SUBFAMILY PHRENAPATINAE (Coleoptera: Tenebrionidae)

Angela Rincon (11185845) 26 July 2021 (has links)
<p> A revision of the Neotropical darkling beetle genus <i>Phrenapates</i> Gray 1832 (Tenebrionidae: Phrenapatinae) was conducted. Using over 300 specimens of Phrenapates, the genus is redescribed with its taxonomic history and classification summarized. Lectotypes are designated for <i>Phrenapates bennettii</i> Gray 1832, <i>P. ohausi</i> Gebien 1910, <i>P. dux</i> Gebien 1910, and <i>P. educator</i> Gebien 1910 to stabilize species concepts. Two new species are described: <i>Phrenapates gilloglyi</i> Rincon & Smith <b>sp. nov.</b> and <i>Phrenapates fortunaensis</i> Rincon & Smith <b>sp. nov.</b> A total of eight species are now recognized (<i>P. bennettii</i>, <i>P. ohausi</i>, <i>P. dux</i>, <i>P. mandibularis</i>, <i>P. educator</i>, <i>P. latreillei</i>, <i>P. gilloglyi</i>, and <i>P. fortunaensis</i>). Distribution maps and a key to <i>Phrenapates</i> species are provided.</p> In order to assess the status and relationships of the tribes in the subfamily Phrenapatinae, a molecular dataset was constructed for phlogenetic analyses. Nine gene regions were used: nuclear wingless (wg), mitochondrial cytochrome b (cytb), mitochondrial cytochrome oxidase I (COI), nuclear Arginine Kinase (ArgK), ribosomal RNA (12S, 16S, & 18S), nuclear ribosomal 28S, and carbamoyl-phosphate synthetase domain of rudimentary (CAD). Taxa were selected based on the availability of nucleotide sequences from the GenBank and BOLD databases, as well as previously unpublished sequences provided by the Smith lab. Phylogenetic analyses revealed that: (1) the subfamily Phrenapatinae is likely monophyletic; (2) <i>Archaeoglenes</i> is sister to the other phrenapatines in all analyses which, alongside morphological evidence, supports the concept of the tribe Archaeoglenini; (3) the relationship between Phrenapatini and Penetini varied between analyses, though morphological characters used to separate the two tribes appear stable; (4) Penetini, the most species rich tribe within the subfamily, may not be monophyletic.
2

Contribution de différents éléments forestiers et non-forestiers de la trame de très vieux bois à la diversité des coléoptères saproxyliques / How elementary components of the saproxylic habitat network contribute to associated beetle diversity ?

Parmain, Guilhem 22 January 2015 (has links)
La disparition et la fragmentation d’habitat sont considérées comme des causes majeures de l’érosion de la biodiversité.Les forêts sont parmi les plus riches écosystèmes terrestres de la planète. La simplification structurelle et la disparition d’éléments d’habitats clés qui résultent de leur exploitation mettent en péril la biodiversité qu’elles abritent.Grâce à l’analyse de différents jeux de données mutualisés entre plusieurs laboratoires et de deux jeux de donnéesoriginaux générés par mes travaux, l’objectif de cette thèse est d’évaluer le rôle joué par plusieurs éléments de la Trame de Très Vieux Bois pour la diversité des coléoptères saproxyliques aux échelles locale et paysagère. L’effet des caractéristiques du milieu et la biodiversité associée aux ilots de vieillissement, réserves forestières et arbres isolés extra-forestiers ont été évalués.En parallèle, nous avons conduit des explorations méthodologiques concernant la principale technique d’échantillonnagede notre modèle biologique. Nous avons mis en évidence les effets (i) forts de la réplication spatiale ou temporelle des dispositifs d’échantillonnage sur les données obtenues, mais (ii) négligeables de l’exclusion d’une famille couteuse en temps d’identification sur les résultats.Nos résultats écologiques indiquent l’effet de l’arrêt d’exploitation sur la reconstitution des compartiments bois mort etdendromicrohabitats et des assemblages de coléoptères saproxyliques associés, au contraire de l’extension de rotationreprésentée par les ilots de vieillissement. D’importantes densités de réserves forestières dans le paysage (plus de 20%) semblent nécessaires pour une conservation efficace de la faune saproxylique. De plus, nous avons mis en évidence qu’une part importante des espèces saproxyliques est préférentiellement retrouvée sur des arbres solitaires, non-forestiers. La totalité de la faune saproxylique n’est donc pas abritée par la forêt. Ces structures non forestières représentent des éléments primordiaux à prendre en compte pour la sauvegarde de la biodiversité saproxylique. / Habitat loss and fragmentation are considered as major threats to biodiversity in forests, one of the species-richest terrestrial ecosystems worldwide. The structural simplification and the loss of key habitat elements resulting from forest harvesting threaten forest biodiversity. Through the analysis of datasets shared between laboratories and two original datasets created during this thesis, I intended to evaluate the role for associated beetle diversity of several components of the saproxylic habitat network at local and landscape scales. The effect of local environmental variables has been evaluated and the biodiversity associated with ageing stands, forest reserves and isolated non-forest trees were explored. In parallel, we have analyzed the main technique used to sample our study group. We highlighted (i) strong effects of spatial or temporal replication of sampling on data, but (ii) negligible effects of data simplification by excluding a time-expensive family on results. We demonstrated significant effects of forest setting aside on the restoration, mainly of dead wood and tree microhabitats, but also on associated saproxylic beetle assemblages. Extended rotations in ageing stands did not provide such positive effects. Besides, we evidenced that a high density of forest reserves in the landscape (over 20%) seems necessary to efficiently favor the saproxylic fauna. In addition, we observed that a significant proportion of saproxylic species prefer non-forest solitary tree habitats. The whole saproxylic fauna is therefore not hosted by forests. These non-forest saproxylic structures have to be included in conservation strategies dedicated saproxylic biodiversity.
3

Untersuchungen zur Stuktur und Sukzession der saproxylen Käferfauna (Coleoptera) an Eichen- und Buchentotholz / A study of structure and succession of saproxylic beetle fauna (Coleoptera) living in decaying oak and beech wood

Menke, Norbert 20 January 2006 (has links)
No description available.

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