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Morphology, molecules and mating behavior: an integrative study of population divergence and speciation in widespread sepsid flies (Sepsidae: Diptera)


Puniamoorthy, Nalini. Morphology, molecules and mating behavior: an integrative study of population divergence and speciation in widespread sepsid flies (Sepsidae: Diptera). 2013, University of Zurich, Faculty of Science.

Abstract

Europäische und nordamerikanische Populationen der weit verbreiteten Schwingfliege Sepsis punctum, gehören zur gleichen Art, unterscheiden sich aber im Paarungsverhalten und Geschlechtsdimorphismus, eine in dieser Ausprägung bislang einzigartige Situation. Experimentelle Laboruntersuchungen zeigten, dass der Paarungsvorteil grosser Männchen in Europa sehr stark ist, während Weibchen in Nordamerika einen Balztanz bevorzugen und die Grösse weniger wichtig ist. Mittels molekularer Methoden konnte starke populationsgenetische Differenzierung dokumentiert werden. Genetische Isolation und systematische Unterschiede im sexuellen Selektionsdruck auf Verhalten und Morphologie erklären die kontinentalen Unterschiede zwischen den Populationen und weisen auf Artbildung hin.

General summary
This work explores processes of selection and speciation acting on diverging populations in widespread sepsid flies. The main focus was on Sepsis punctum where European and North American populations differed greatly in mating behavior and sexual size dimorphism, that is unique to this species. Laboratory experiments show that large male body size is a strong mating advantage in Europe but in North America females prefer a courtship behavior and male size is less important. Molecular methods also suggest that there is strong genetic differences between populations. This integrative research, including detailed behavioral, morphological and molecular data, shows that genetic isolation and systematic differences in selection on reproductive traits explain the continental differences in this species.

Abstract

Europäische und nordamerikanische Populationen der weit verbreiteten Schwingfliege Sepsis punctum, gehören zur gleichen Art, unterscheiden sich aber im Paarungsverhalten und Geschlechtsdimorphismus, eine in dieser Ausprägung bislang einzigartige Situation. Experimentelle Laboruntersuchungen zeigten, dass der Paarungsvorteil grosser Männchen in Europa sehr stark ist, während Weibchen in Nordamerika einen Balztanz bevorzugen und die Grösse weniger wichtig ist. Mittels molekularer Methoden konnte starke populationsgenetische Differenzierung dokumentiert werden. Genetische Isolation und systematische Unterschiede im sexuellen Selektionsdruck auf Verhalten und Morphologie erklären die kontinentalen Unterschiede zwischen den Populationen und weisen auf Artbildung hin.

General summary
This work explores processes of selection and speciation acting on diverging populations in widespread sepsid flies. The main focus was on Sepsis punctum where European and North American populations differed greatly in mating behavior and sexual size dimorphism, that is unique to this species. Laboratory experiments show that large male body size is a strong mating advantage in Europe but in North America females prefer a courtship behavior and male size is less important. Molecular methods also suggest that there is strong genetic differences between populations. This integrative research, including detailed behavioral, morphological and molecular data, shows that genetic isolation and systematic differences in selection on reproductive traits explain the continental differences in this species.

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Additional indexing

Item Type:Dissertation (monographical)
Referees:Blanckenhorn Wolf, Schiestl Florian P
Communities & Collections:07 Faculty of Science > Department of Systematic and Evolutionary Botany
07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
UZH Dissertations
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Language:English
Place of Publication:Zürich
Date:2013
Deposited On:21 Jan 2014 15:58
Last Modified:07 Apr 2020 06:42
Number of Pages:117
OA Status:Green
Related URLs:https://www.recherche-portal.ch/permalink/f/5u2s2l/ebi01_prod009962310 (Library Catalogue)

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