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Competition-driven build-up of habitat isolation and selection favoring modified dispersal patterns in a young avian hybrid zone
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Zooekologi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Zooekologi. Univ Helsinki, Zool Unit, Finnish Museum Nat Hist, FIN-00014 Helsinki, Finland..
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Zooekologi.ORCID-id: 0000-0002-0706-458x
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Zooekologi.
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2016 (Engelska)Ingår i: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 70, nr 10, s. 2226-2238Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Competition-driven evolution of habitat isolation is an important mechanism of ecological speciation but empirical support for this process is often indirect. We examined how an on-going displacement of pied flycatchers from their preferred breeding habitat by collared flycatchers in a young secondary contact zone is associated with (a) access to an important food resource (caterpillar larvae), (b) immigration of pied flycatchers in relation to habitat quality, and (c) the risk of hybridization in relation to habitat quality. Over the past 12 years, the estimated access to caterpillar larvae biomass in the habitat surrounding the nests of pied flycatchers has decreased by a fifth due to shifted establishment possibilities, especially for immigrants. However, breeding in the high quality habitat has become associated with such a high risk of hybridization for pied flycatchers that overall selection currently favors pied flycatchers that were forced to immigrate into the poorer habitats (despite lower access to preferred food items). Our results show that competition-driven habitat segregation can lead to fast habitat isolation, which per se caused an opportunity for selection to act in favor of future "voluntarily" altered immigration patterns and possibly strengthened habitat isolation through reinforcement.

Ort, förlag, år, upplaga, sidor
2016. Vol. 70, nr 10, s. 2226-2238
Nyckelord [en]
Competitive exclusion, ecological speciation, habitat segregation, prezygotic isolation, speciation
Nationell ämneskategori
Evolutionsbiologi
Identifikatorer
URN: urn:nbn:se:uu:diva-307727DOI: 10.1111/evo.13019ISI: 000385550700005PubMedID: 27464950OAI: oai:DiVA.org:uu-307727DiVA, id: diva2:1048431
Forskningsfinansiär
VetenskapsrådetTillgänglig från: 2016-11-21 Skapad: 2016-11-21 Senast uppdaterad: 2018-08-10Bibliografiskt granskad
Ingår i avhandling
1. Speciation and Metabolic rate: Insights from an avian hybrid zone
Öppna denna publikation i ny flik eller fönster >>Speciation and Metabolic rate: Insights from an avian hybrid zone
2017 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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. 

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2017. s. 43
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1462
Nyckelord
resting metabolic rate, life history, hybridization, speciation, reproductive isolation, Ficedula flycatcher
Nationell ämneskategori
Ekologi Evolutionsbiologi Genetik
Forskningsämne
Biologi med inriktning mot zooekologi
Identifikatorer
urn:nbn:se:uu:diva-309969 (URN)978-91-554-9776-7 (ISBN)
Disputation
2017-02-10, Zootissalen, Villavägen 9, Uppsala, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2017-01-19 Skapad: 2016-12-08 Senast uppdaterad: 2018-08-10

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McFarlane, S. ErynWheatcroft, DavidÅlund, MurielleQvarnström, Anna
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