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WelcomeTeachingProposed research subjects:
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Proposed research subjects
Masters

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Proposed research subjects: Bachelors and Masters

Responsable : Dr Mathieu Perret

En collaboration avec : Dr Alain Chautems (taxonomie des Gesneriaceae néotropicales)
Tél : +41 22 418 5195
Fax : +41 22 418 5101
Email

Sujet proposé :

Systématique et évolution florale dans la famille des Gesneriaceae

Évolution des plantes à fleurs, en particulier dans la famille des Gesneriacées. Reconstruction d’arbres phylogénétiques sur la base de l’analyse de séquences d’ADN et utilisation de ces phylogénies pour proposer de nouvelles classifications, comprendre l’évolution des caractères floraux, les modes de spéciation et la distribution géographique des espèces. Études des bases moléculaires déterminant certains caractères floraux, en particulier ceux qui jouent un rôle important dans les relations entre les plantes et leurs pollinisateurs (p.ex. couleur de la fleur, parfum).

Références représentatives :

Perret, M., A. Chautems, R. Spichiger, T. G. Barraclough and V. Savolainen.2007. Geographic pattern of speciation and floral diversification in the Neotropics: the tribe Sinningieae (Gesneriaceae) as a case study. Evolution 61 : 1641-1660.
Perret, M., A. Chautems, R. Spichiger. 2006. Dispersal-vicariance analyses in the tribe Sinningieae (Gesneriaceae) : a clue to understanding biogeographical history of the Brazilian Atlantic forest. Annals of the Missouri Botanical Garden 93 : 340-358.
Perret, M., A. Chautems, R. Spichiger, G. Kite, and V. Savolainen. 2003. Systematics and evolution of tribe Sinningieae (Gesneriaceae): evidence from phylogenetic analyses of six plastid DNA regions and nuclear ncpGS. American Journal of Botany 90: 445-460.
Perret, M., A. Chautems, R. Spichiger, M. Peixoto, and V. Savolainen . 2001. Nectar sugar composition in relation to pollination syndromes in Sinningieae (Gesneriaceae). Annals of Botany 87: 267-273.

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Responsable : Dr Michelle Price

Conservatrice
Tél : +41 22 418 5148
Fax : +41 22 418 5101
Email
Webpage

Sujets proposés :

1) Peristome strucutre in the moss Cynodontium polycarpum and a comparison of peristome architecture in the genus Cynodontium Bruch & Schimp.: taxonomic and phylogenetic insights.

Context: The peristomes of mosses, considered to be relatively conserved structures, represent one of the most complex morphological features to be found within this group of plants. Peristomes are widely used in the higher level classification of mosses (classes, orders, families) and also, in certain taxa, for distinguishing entities at the generic and specific levels. Structural differences in peristome morphology / anatomy at the specific levels are much less well-understood. In certain groups, such as Grimmia Hedw., longitudinal sections of the peristome teeth have revealed species specific traits that could also be potentially useful in future phylogenetic inferences, in combination with other morphological and molecular characters.

This research project involves the study of variability in peristome morphology / anatomy in populations of the widespread Holoarctic moss Cynodontium polycarpum (Hedw.) Schimp. (Rhabdoweisiaceae) and the comparison of a typical Cynodontium polycarpum peristome type to the peristomes of other species of the same genus. The aims of the project are to: 1) establish the degree of variability in peristome structure in C. polycarpum; 2) compare peristome structure of different species from within the same genus to establish whether certain peristome traits are species-specific, and 3), assess the potential for the use of differences-similarities in peristome structure in phylogenetic inferences in Cynodontium. This Masters research project will contribute to on-going research on peristomes of the Dicranidae at the CJBG

2) The morphological and ecological distinctions between Tortella bambergeri and Tortella tortuosa ( (Pottiaceae, Bryophyta).

Tortella bambergeri (Schimp.) Broth. and Tortella tortuosa Hedw.) Limpr. are morphologically close species. This research involves the study of herbarium and freshly collected samples of these two species,and the elaboration of any structural (morphological and anatomical), ecological or biological differences between them. The aim of this project is to provide morphological / ecological evidence that facilitates the correct distinction of these two species in the field and laboratory. This research also forms a contribution towards the Moss Flora of Switzerland by clarifying the identities of these two taxa within Switzerland through the study of material collected from Switzerland.

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Responsable : Dr Philippe Clerc
Conservateur CJB

Tél : +41 22 418 5128
Fax: +41 22 418 5101

Sujet proposé :

La végétation lichénique des murs de pierre du canton de Genève.

Les vieux murs en pierres constituent un habitat exceptionnel et indispensable à la vie de nombreux organismes vivants. Un récent inventaire du mur de Rampe de la Treille à Genève a mis en évidence près de 150 espèces tous organismes confondus. Le but du travail proposé est d'étudier les lichens (inventaire, sociologie, écologie, protection) de ces habitats en voie de disparition et de proposer des mesures de conservation. Ce travail devra se faire en collaboration avec l'inventaire des bryophytes en cours et fera l'objet d'une publication.

Références représentatives:

Bus, S. 2011: L'étonnate biodiversité des vieux murs. - Sécurité Environnement (sous presse) (www.securité-environnement.ch) Cezanne, R., M. Eichler, U. Kirschbaum and U. Windisch 2008: Flechten als Anzeiger des Klimawandels. Lichens as indicators of climate change. - Sauteria 15: 159-174.
Abstract: [Study of 30 wall sections in Hesse, Germany. "An explicit correlation between lichen occurrence and climatic factors is manifest, particularly to temperature."]
Ohmura, Y. & M. Nakanishi 1996: Studies on relationship between the growth positions and the microclimates of lichens on stone wall in a rice field, Hiroshima, Japan. - Hikobia 12: 61-68.
Segal, S. 1969: Ecological Notes on wall Vegetation. - Dr. W. Junk N.V., Publishers, The Hague. 325 pp.

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