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Hybrid Dysfunction Expressed as Elevated Metabolic Rate in Male Ficedula Flycatchers
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.ORCID iD: 0000-0002-0706-458x
Univ Helsinki, Finnish Museum Nat Hist, Zool Unit, Helsinki, Finland; Univ Turku, Sect Ecol, Dept Biol, Turku, Finland.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.ORCID iD: 0000-0003-2861-9721
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.ORCID iD: 0000-0002-1178-4053
2016 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 11, no 9, article id e0161547Article in journal (Refereed) Published
Abstract [en]

Studies of ecological speciation are often biased towards extrinsic sources of selection against hybrids, resulting from intermediate hybrid morphology, but the knowledge of how genetic incompatibilities accumulate over time under natural conditions is limited. Here we focus on a physiological trait, metabolic rate, which is central to life history strategies and thermoregulation but is also likely to be sensitive to mismatched mitonuclear interactions. We measured the resting metabolic rate of male collared, and pied flycatchers as well as of naturally occurring F1 hybrid males, in a recent hybrid zone. We found that hybrid males had a higher rather than intermediate metabolic rate, which is indicative of hybrid physiological dysfunction. Fitness costs associated with elevated metabolic rate are typically environmentally dependent and exaggerated under harsh conditions. By focusing on male hybrid dysfunction in an eco-physiological trait, our results contribute to the general understanding of how combined extrinsic and intrinsic sources of hybrid dysfunction build up under natural conditions.

Place, publisher, year, edition, pages
2016. Vol. 11, no 9, article id e0161547
National Category
Zoology
Identifiers
URN: urn:nbn:se:uu:diva-307010DOI: 10.1371/journal.pone.0161547ISI: 000382855600038OAI: oai:DiVA.org:uu-307010DiVA, id: diva2:1053210
Funder
Swedish Research Council, 621-2012-3722Available from: 2016-12-08 Created: 2016-11-08 Last updated: 2018-08-10Bibliographically approved
In thesis
1. Speciation and Metabolic rate: Insights from an avian hybrid zone
Open this publication in new window or tab >>Speciation and Metabolic rate: Insights from an avian hybrid zone
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The role of divergent climate adaptation in speciation has received surprisingly little scientific attention. My dissertation research focused on how resting metabolic rate (RMR) relates to the build up of prezygotic and postzygotic isolation in a natural Ficedula flycatcher hybrid zone. RMR is the amount of energy an organism needs to run its internal organs. Since RMR is related to life history traits and thermoregulation in other systems, it is likely to affect speciation processes at secondary contact. I found that adult collared flycatchers displace pied flycatchers into increasingly poor habitats (Paper I). Pied nestlings exhibit lower RMR in poor environments (Paper II), which may promote regional coexistence and habitat isolation by making it possible for pied flycatchers to escape competition from collared flycatchers and reduce the risk of hybridization by breeding in the poorer habitats. Further, I found that while collared flycatcher nestling RMR was not environmentally-dependent (Paper II, Paper III), those collared flycatcher nestlings that had a lower RMR in poor environments tended to have higher condition (Paper III). Further, RMR was genetically linked to a sexual ornament in collared males that has previously been shown to be beneficial in poor environments. Lastly, I found that by seven days old, nestlings increase their metabolic rate when listening to song, indicating that they are listening, and by 9 days they can discriminate between songs (Paper IV). Taken together, RMR could affect pre-zygotic isolation via correlations with life history strategies, song and sexual ornaments. RMR is also related to post zygotic isolation in Ficedula flycatchers. I found that flycatcher hybrids tended to have a higher RMR than the parental species (Paper V), and that there were many differentially expressed genes in energetically expensive organs in hybrids that were related to metabolic function (Paper VI). Thus, metabolic dysfunction, possibly caused by genetic incompatibilities, in Ficedula flycatcher hybrids could be a factor leading to infertility and postzygotic isolation between the parental species. Overall, I find that RMR could be a general physiological trait that affects both pre- and postzygotic isolation in hybridizing species at secondary contact, and ought to be more thoroughly considered in speciation research. 

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2017. p. 43
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1462
Keywords
resting metabolic rate, life history, hybridization, speciation, reproductive isolation, Ficedula flycatcher
National Category
Ecology Evolutionary Biology Genetics
Research subject
Biology with specialization in Animal Ecology
Identifiers
urn:nbn:se:uu:diva-309969 (URN)978-91-554-9776-7 (ISBN)
Public defence
2017-02-10, Zootissalen, Villavägen 9, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2017-01-19 Created: 2016-12-08 Last updated: 2018-08-10

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McFarlane, S. ErynÅlund, MurielleQvarnström, Anna

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