Home | My Profile | Contact Us
Research Trends Products  |   order gateway  |   author gateway  |   editor gateway  
Register | Forgot Password

Author Resources
 Author Gateway
 Article submission guidelines

Editor Resources
 Editor/Referee Gateway

 Regional Subscription Agents/Distributors
Trends in Entomology   Volumes    Volume 15 
Suitability of COI, COII, 18S, and ITS2 for phylogeny and systematics of black fly (Diptera: Simuliidae)
Christine Gaudreau, Bernard LaRue, Guy Charpentier
Pages: 59 - 74
Number of pages: 16
Trends in Entomology
Volume 15 

Copyright © 2019 Research Trends. All rights reserved

A sample of 15 blackfly (Diptera: Simuliidae) species collected in Quebec as larval specimens is used to evaluate COI, COII and 18S rDNA for their abilities to resolve distinct levels of evolutionary depth. Following characterization of the mutation pattern, the COI and COII computer simulations show that too frequent base interchanges at the degenerate third codon position quickly lead to early mutation saturation and to a loss of phylogenetic resolution. However, both mtDNA markers appear well suited for distinguishing closely related species. Molecular evidence also sheds doubts on the value of morphology alone for classifying Prosimuliini larvae, up to the point of calling for a taxonomic reappraisal of the whole tribe. At the opposite end of the phylogenetic spectrum, 18S elucidates remote divergence events while losing resolving power at low levels due to sequence conservatism as embodied by a limited number of informative sites being concentrated within two hot spot regions. In an attempt to fill the gap between ancient and recent divergence events, a composite tree was built from 18S, ITS2 and the COI/COII codons undergoing amino acid changes. Results show that a well weighed combination of markers evolving on different time scales can cover multiple taxonomic levels.
View Full Article  


Buy this article
Buy this volume
Subscribe to this title
Shopping Cart

Quick Links
Search Products
Browse in Alphabetical Order : Journals
Browse by Subject Classification : Journals

Ordering Information Ordering Information
Downloadable forms Downloadable Forms