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Evolution of male age-specific reproduction under differential risks and causes of death: males pay the cost of high female fitness
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
2016 (English)In: Journal of Evolutionary Biology, ISSN 1010-061X, E-ISSN 1420-9101, Vol. 29, no 4, p. 848-856Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

Classic theories of ageing evolution predict that increased extrinsic mortality due to an environmental hazard selects for increased early reproduction, rapid ageing and short intrinsic lifespan. Conversely, emerging theory maintains that when ageing increases susceptibility to an environmental hazard, increased mortality due to this hazard can select against ageing in physiological condition and prolong intrinsic lifespan. However, evolution of slow ageing under high-condition-dependent mortality is expected to result from reallocation of resources to different traits and such reallocation may be hampered by sex-specific trade-offs. Because same life-history trait values often have different fitness consequences in males and females, sexually antagonistic selection can preserve genetic variance for lifespan and ageing. We previously showed that increased condition-dependent mortality caused by heat shock leads to evolution of long-life, decelerated late-life mortality in both sexes and increased female fecundity in the nematode, Caenorhabditis remanei. Here, we used these cryopreserved lines to show that males evolving under heat shock suffered from reduced early-life and net reproduction, while mortality rate had no effect. Our results suggest that heat-shock resistance and associated long-life trade-off with male, but not female, reproduction and therefore sexually antagonistic selection contributes to maintenance of genetic variation for lifespan and fitness in this population.

Place, publisher, year, edition, pages
2016. Vol. 29, no 4, p. 848-856
Keywords [en]
heat shock, intralocus sexual conflict, life-history trade-off, senescence, sex-specific pleiotropy
National Category
Evolutionary Biology
Identifiers
URN: urn:nbn:se:uu:diva-295550DOI: 10.1111/jeb.12833ISI: 000373929000015PubMedID: 26801472OAI: oai:DiVA.org:uu-295550DiVA, id: diva2:934338
Available from: 2016-06-08 Created: 2016-06-08 Last updated: 2018-04-09Bibliographically approved
In thesis
1. Condition-dependence in life history evolution
Open this publication in new window or tab >>Condition-dependence in life history evolution
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Ageing is the progressive physiological deterioration that appears with increasing age and eventually leads to a decline in survival and reproduction. This physiological process is omnipresent across the tree of life, but the expected trajectory can widely vary between and within species. Classic theories predict that the evolution of senescence is strongly influenced by the level of extrinsic mortality. Furthermore, variation in early-life developmental environments can shape individual condition and thus lead to alternative life-history strategies. The interplay between early-life environment and individual condition might therefore predict the trajectory of ageing and is of importance when studying life history evolution. In this thesis, I focus on condition dependent life-history strategies and how this can translate in differential ageing patterns. Moreover, I specifically investigate the influence of early-life environment on key life history traits (i.e. survival and reproduction) and how this might eventually carry-over to future generations via nongenetic inheritance. First, I used an experimental approach involving lab populations of the nematode Caenorhabditis remanei to show that males, but not females, pay the cost for the evolution of increased lifespan (Paper I). Second, I used an empirical dataset based on 25 years of observations, to investigate the long-term effects of early-life environment on reproduction and survival (Paper II). Reproductive success of low-condition females in natural populations of collared flycatchers (Ficedula albicollis) peaks later in life, when high-condition females are already in steep reproductive decline and suffer from high mortality rates. Third, I used the neriid fly Telostylinus angusticollis in an experimental environment, to test whether condition-dependent investment in secondary sexual traits affects the life-history strategies of males (Paper III). High-condition males developed and aged faster than low-condition males, but interaction with rival males did not affect male reproductive ageing. Finally, continuing the T. angusticollis experiment, I also found that parental diet interacts with parental sex and offspring sex, ultimately affecting offspring life-histories. Parental effects can thus play an important role in shaping between-individual variation in reproductive and actuarial senescence (Paper IV). Overall, in this thesis I have explored the interaction between environment, condition and ageing in both experimental and natural settings.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 73
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1662
Keywords
Ageing, senescence, nongenetic inheritance, sex differences, condition-dependence, life history, trade-off, Ficedula albicollis, Caenorhabditis remanei, Telostylinus angusticollis
National Category
Evolutionary Biology
Research subject
Biology with specialization in Animal Ecology
Identifiers
urn:nbn:se:uu:diva-347848 (URN)978-91-513-0314-7 (ISBN)
Public defence
2018-05-25, Zootissalen, Villavägen 9, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2018-05-04 Created: 2018-04-09 Last updated: 2018-05-07

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Chen, Hwei -YenSpagopoulou, FoteiniMaklakov, Alexei A.

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