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Ontogenetic timing as a condition-dependent life history trait: High-condition males develop quickly, peak early, and age fast
Univ New South Wales, Evolut & Ecol Res Ctr, Sch Biol Earth & Environm Sci, Sydney, NSW 2052, Australia..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
Univ New South Wales, Evolut & Ecol Res Ctr, Sch Biol Earth & Environm Sci, Sydney, NSW 2052, Australia..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
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2017 (English)In: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 71, no 3, p. 671-685Article in journal (Refereed) Published
Abstract [en]

Within-population variation in ageing remains poorly understood. In males, condition-dependent investment in secondary sexual traits may incur costs that limit ability to invest in somatic maintenance. Moreover, males often express morphological and behavioral secondary sexual traits simultaneously, but the relative effects on ageing of investment in these traits remain unclear. We investigated the condition dependence of male life history in the neriid fly Telostylinus angusticollis. Using a fully factorial design, we manipulated male early-life condition by varying nutrient content of the larval diet and, subsequently, manipulated opportunity for adult males to interact with rival males. We found that high-condition males developed more quickly and reached their reproductive peak earlier in life, but also experienced faster reproductive ageing and died sooner than low-condition males. By contrast, interactions with rival males reduced male lifespan but did not affect male reproductive ageing. High-condition in early life is therefore associated with rapid ageing in T. angusticollis males, even in the absence of damaging male-male interactions. Our results show that abundant resources during the juvenile phase are used to expedite growth and development and enhance early-life reproductive performance at the expense of late-life performance and survival, demonstrating a clear link between male condition and ageing.

Place, publisher, year, edition, pages
WILEY , 2017. Vol. 71, no 3, p. 671-685
Keywords [en]
Condition dependence, costs of secondary sexual traits, life history, reproductive ageing, senescence, sexual selection
National Category
Evolutionary Biology
Identifiers
URN: urn:nbn:se:uu:diva-320842DOI: 10.1111/evo.13172ISI: 000396039000012PubMedID: 28067402OAI: oai:DiVA.org:uu-320842DiVA, id: diva2:1091373
Funder
Australian Research CouncilEU, European Research CouncilSwedish Research CouncilAvailable from: 2017-04-26 Created: 2017-04-26 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: 2018-10-08

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Spagopoulou, FoteiniMaklakov, Alexei A.

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