Please use this identifier to cite or link to this item:
|Title:||Sensitivity analysis, molecular systematics and natural history evolution of Scathophagidae (Diptera: Cyclorrhapha: Calyptratae)|
|Authors:||Kutty, S.N. |
|Citation:||Kutty, S.N., Bernasconi, M.V., Šifner, F., Meier, R. (2007-02). Sensitivity analysis, molecular systematics and natural history evolution of Scathophagidae (Diptera: Cyclorrhapha: Calyptratae). Cladistics 23 (1) : 64-83. ScholarBank@NUS Repository. https://doi.org/10.1111/j.1096-0031.2006.00131.x|
|Abstract:||The 60 000 described species of Cyclorrhapha are characterized by an unusual diversity in larval life-history traits, which range from saprophagy over phytophagy to parasitism and predation. However, the direction of evolutionary change between the different modes remains unclear. Here, we use the Scathophagidae (Diptera) for reconstructing the direction of change in this relatively small family (≈ 250 spp.) whose larval habits mirror the diversity in natural history found in Cyclorrhapha. We subjected a molecular data set for 63 species (22 genera) and DNA sequences from seven genes (12S, 16S, Cytb, COI, 28S, Ef1-alfa, Pol II) to an extensive sensitivity analysis and compare the performance of three different alignment strategies (manual, Clustal, POY). We find that the default Clustal alignment performs worst as judged by character incongruence, topological congruence and branch support. For this alignment, scoring indels as a fifth character state worsens character incongruence and topological congruence. However, manual alignment and direct optimization perform similarly well and yield near-identical trees, although branch support is lower for the direct-optimization trees. All three alignment techniques favor the upweighting of transversion. We furthermore confirm the independence of the concepts "node support" and "node stability" by documenting several cases of poorly supported nodes being very stable and cases of well supported nodes being unstable. We confirm the monophyly of the Scathophagidae, its two constituent subfamilies, and most genera. We demonstrate that phytophagy in the form of leaf mining is the ancestral larval feeding habit for Scathophagidae. From phytophagy, two shifts to saprophagy and one shift to predation has occurred while a second origin of predation is from a saprophagous ancestor. © The Willi Hennig Society 2006. © 2007 The Willi Hennig Society.|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Jan 17, 2019
WEB OF SCIENCETM
checked on Jan 9, 2019
checked on Jan 18, 2019
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.