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Highlighting the Trichoptera tree with new molecular markers
Stockholm University, Faculty of Science, Department of Zoology, Department of Systematic Zoology. Stockholm University, Faculty of Science, Department of Zoology.
Naturhistoriska Riksmuseet, Enheten för Entomologi.
University of Turku, Department of Biology, Laboratory of Genetics.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

We here present phylogenetic hypotheses of the insect order Trichoptera, based on molecular data from four nuclear protein-coding genes, Cadherin-like gene (CAD), Elongation-factor 1 alpha (EF1a), Isocitrate dehydrogenase (IDH) and RNA polymerase II (POL), and the mitochondrial Cytochrome oxidase subunit I (COI) gene. Ribosomal RNA and morphological characters have previously been widely used for reconstructing phylogenetic hypothesis at order level among insects, but were excluded from this study in order to explore the potential of only using easily amplified and aligned protein-coding genes in resolving phylogenies of this level. Analyses were performed to investigate the signal and contribution of each gene in light of the final phylogeny derived from combined data. The study is based on 139 specimens from 46 families of the order Trichoptera, as well as 10 outgroup taxa from the sistergroup Lepidoptera. The results show great similarities to previously published phylogenies mainly based on rRNA and morphology, but differ from those in some interesting aspects. The CAD, IDH and COI genes provided strong signal to the phylogeny, whereas EF1a and POL provided less strong signal, but nevertheless did all the genes contribute well to the combined data phylogenies.

National Category
Biological Systematics
Research subject
Systematic Zoology
Identifiers
URN: urn:nbn:se:su:diva-38580OAI: oai:DiVA.org:su-38580DiVA: diva2:310963
Available from: 2010-04-19 Created: 2010-04-19 Last updated: 2010-04-19Bibliographically approved
In thesis
1. Climbing the Trichoptera Tree: Investigations of Branches and Leaves
Open this publication in new window or tab >>Climbing the Trichoptera Tree: Investigations of Branches and Leaves
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The Trichoptera (caddisflies) is the largest of the primary aquatic insect orders, currently including more than 13,500 species. With more than 100 species new to science described annually, the known caddisfly diversity is rapidly increasing. In the first four papers of this Thesis, a total of 22 species new to science are described. The first three papers include revisions of the New Caledonian species for the genera Symphitoneuria, Gracilipsodes and Triplectides, with descriptions of 3, 7 and 11 new species, respectively. In these papers I strengthen our image of New Caledonia as a biodiversity hotspot. The fourth paper describes a new genus and species from Madagascar, another biodiversity hotspot. These four papers all deal with species and genera of the family Leptoceridae, which ranks among the three largest families within Trichoptera. The family comprises high species diversity together with a widespread distribution and has been of interest to many trichopterologists. However, the classification used for genera and tribes within the family follows a phylogenetic hypothesis from 1981. In paper V I apply a molecular approach for hypothesising phylogenetic relationships within the family, revealing support for the erection of two tribes to subfamily level and for the synonymisations of 2 pairs of genera. At order level, the progress of illuminating the evolutionary history of Trichoptera is advancing with recent analyses using molecular based data. Previously published phylogenetic hypotheses of the order were to a large degree dependent on ribosomal DNA, a source of molecular data not without its controversies, particularly regarding alignment procedures. Paper VI presents Trichoptera phylogenies based on sequences of protein-coding nuclear and mitochondrial genes. My results correspond well to previously published hypotheses among suborder relationships, but show additional and contrasting resolution within suborders.

Place, publisher, year, edition, pages
Stockholm: Department of Zoology, Stockholm University, 2010. 26 p.
Keyword
Trichoptera, Leptoceridae, Symphitoneuria, Gracilipsodes, Triplectides, morphology, DNA, systematics, phylogeny, New Caledonia, Madagascar, new species, new genus
National Category
Biological Systematics
Research subject
Systematic Zoology
Identifiers
urn:nbn:se:su:diva-38583 (URN)978-91-7447-033-8 (ISBN)
Public defence
2010-05-21, Lilla Hörsalen, Naturhistoriska riksmuseet, Frescativägen 40, Stockholm, 13:00 (English)
Opponent
Supervisors
Note
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: Manuscript. Paper 5: Manuscript. Paper 6: Manuscript.Available from: 2010-04-28 Created: 2010-04-19 Last updated: 2010-04-21Bibliographically approved

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