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The evolution of alternative developmental pathways: footprints of selection on life-history traits in a butterfly
Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen.
Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen. Uppsala University, Sweden.
Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen.ORCID-id: 0000-0002-4560-6271
2012 (engelsk)Inngår i: Journal of Evolutionary Biology, ISSN 1010-061X, E-ISSN 1420-9101, Vol. 25, nr 7, s. 1377-1388Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Developmental pathways may evolve to optimize alternative phenotypes across environments. However, the maintenance of such adaptive plasticity under relaxed selection has received little study. We compare the expression of life-history traits across two developmental pathways in two populations of the butterfly Pararge aegeria where both populations express a diapause pathway but one never expresses direct development in nature. In the population with ongoing selection on both pathways, the difference between pathways in development time and growth rate was larger, whereas the difference in body size was smaller compared with the population experiencing relaxed selection on one pathway. This indicates that relaxed selection on the direct pathway has allowed life-history traits to drift towards values associated with lower fitness when following this pathway. Relaxed selection on direct development was also associated with a higher degree of genetic variation for protandry expressed as within-family sexual dimorphism in growth rate. Genetic correlations for larval growth rate across sexes and pathways were generally positive, with the notable exception of correlation estimates that involved directly developing males of the population that experienced relaxed selection on this pathway. We conclude that relaxed selection on one developmental pathway appears to have partly disrupted the developmental regulation of life-history trait expression. This in turn suggests that ongoing selection may be responsible for maintaining adaptive developmental regulation along alternative developmental pathways in these populations.

sted, utgiver, år, opplag, sider
2012. Vol. 25, nr 7, s. 1377-1388
Emneord [en]
developmental plasticity, diapause, direct development, Lepidoptera, Phenotypic plasticity, relaxed selection, seasonal polyphenism, sexual dimorphism protandry, voltinism
HSV kategori
Forskningsprogram
zoologisk ekologi
Identifikatorer
URN: urn:nbn:se:su:diva-80034DOI: 10.1111/j.1420-9101.2012.02525.xISI: 000305130800014OAI: oai:DiVA.org:su-80034DiVA, id: diva2:551987
Forskningsfinansiär
Swedish Research CouncilA multiscale, cross‐disciplinary approach to the study of climate change effect on ecosystem services and biodiversity
Merknad

AuthorCount:3;

Tilgjengelig fra: 2012-09-12 Laget: 2012-09-12 Sist oppdatert: 2017-12-07bibliografisk kontrollert
Inngår i avhandling
1. The diapause switch: Evolution of alternative developmental pathways in a butterfly
Åpne denne publikasjonen i ny fane eller vindu >>The diapause switch: Evolution of alternative developmental pathways in a butterfly
2014 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Diapause decision is a classic example of a threshold switch mechanism with cascading effects on morphology, behaviour and life-history traits. This thesis addresses the downstream effects of the insect diapause switch, with the main focus on pathway-specific regulation of life-history traits, using the speckled wood butterfly (Pararge aegeria) as a study species. The ultimate pathway decision is made towards the end of larval development and allows the larvae to take into account up-to-date information from the environment about future conditions (Paper I, IV). However, already from an early point in development the larvae are sensitive to environmental cues and continuously adjust their growth trajectory in accordance to current information about the environmental conditions to be expected in future (Paper IV). An asymmetry in the ability to change from one developmental pathway to another at a late point in larval development suggests that the diapause and the direct pathway require different physiological preparations (Paper IV). Pathway-specific regulation of traits downstream of the diapause switch is maintained by ongoing selection. When the direct pathway is not regularly expressed, as with a shift from bivoltinism to univoltinism, relaxed selection on the unexpressed pathway leads to genetic drift and loss of protandry (Paper II, III). Natural populations display local adaptations in the diapause switch with an increase in critical daylengths as there is a gradual shift from bivoltinism to univoltinism (Paper III). This thesis highlights two aspects of the diapause decision, the determination of how and when this decision is made as well as the way the resulting pathways are moulded by selection in order to produce adaptive seasonal polyphenism in life-history traits.

sted, utgiver, år, opplag, sider
Stockholm: Department of Zoology, Stockholm University, 2014. s. 18
Emneord
Developmental plasticity, phenotypic plasticity, developmental switch, threshold trait, life-cycle regulation, direct development, Lepidoptera
HSV kategori
Forskningsprogram
zoologisk ekologi
Identifikatorer
urn:nbn:se:su:diva-103200 (URN)978-91-7447-917-1 (ISBN)
Disputas
2014-06-12, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 13:00 (engelsk)
Opponent
Veileder
Merknad

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Manuscript.

Tilgjengelig fra: 2014-05-22 Laget: 2014-05-08 Sist oppdatert: 2014-05-20bibliografisk kontrollert

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