Cophylogenetics of the Brueelia-complex (Phthiraptera: ischnocera) with avian hosts and bacterial endosymbionts

Parasitism is an extremely common and widespread life-strategy, thus understanding the evolution of parasites with hosts remains an integral topic in evolutionary biology. Feather lice (Phthiraptera: Ischnocera) are a group of permanent ectoparasitic insects that spend their entire life cycle on their host, only being mobile when transmitting between individual hosts such as parents and offspring. The Brueelia-complex is an incredibly speciose group of feather lice found mostly on passerine birds across the world. There are already over 400 species in this group that have been described, with many more left to be discovered or synonymized. Noted for its strong host-specificity, the Brueelia-complex serves as a choice model to study coevolution and co-diversification. To study these processes a phylogenetic framework is needed. To achieve this, I first analyzed over 1000 gene sequences using concatenated and coalescent methods to construct well-supported phylogenies for genera within the Brueelia-complex that help resolve disputed generic relationships. I then performed cophylogenetic analyses with avian hosts that revealed distinct patterns of host-switching of lice a.) within suboscine birds, and b.) in and out of passerine hosts. A biogeographical analysis suggests a New World origin of the Brueelia-complex and subsequent diversification into other continents. Lastly, phylogenetic analyses of bacterial endosymbionts provide the first insight into the relationships among Sodalis symbionts within the Brueelia-complex. Together, my results provide the most current assessment of the relationships among the many genera within the Brueelia-complex and insight into their coevolutionary history with avian hosts and symbiotic bacteria.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Ecol, Evol, Conservation Biol

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2023

Author dc:creator

• D'Alessio, Lorenzo Mario

Contributors dc:contributor

• Johnson, Kevin P
• Dietrich, Christopher
• Hauber, Mark E

• Brueelia
• Parasitism
• Lice
• Endosymbiont
• Phthiraptera
• Ischnocera

Statement dc:rights

• Copyright 2023 Lorenzo D'Alessio

Language dc:language

en, eng

Handle dc:identifier

https://hdl.handle.net/2142/120157

OAI record oai:identifier

https://www.ideals.illinois.edu/oai-pmh?verb=GetRecord&metadataPrefix=etdms&identifier=oai%3Awww.ideals.illinois.edu%3A2142%2F120157