Integrating natural and sexual selection across the biphasic life cycle

Purchase, Craig F.; Evans, Jonathan P.; Roncal, Julissa

doi:10.32942/osf.io/eu3am

Cited by 6 publications

(13 citation statements)

References 69 publications

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“…In polyandrous mating systems like lake trout, male "fertility" is influenced by the ability to achieve fertilizations under sperm competition [33,44], a key component [45] being sperm swimming performance. We thus quantified male "fertility" by measuring sperm traits that predict paternity.…”

Section: Methodsmentioning

confidence: 99%

“…• The special problem of sperm senescence Reproductive senescence includes senescence on the adult individual (such as ability to attract a mate), but additionally on gametes [31,[41][42][43]. Gamete senescence affects the fitness of the individual, but also its mate and offspring [43,44]. However, separating effects of the parent, gamete, and offspring is difficult, especially in internal fertilizers.…”

Section: Desirable Study Systems To Fill Key Voidsmentioning

confidence: 99%

“…Sperm are particularly vulnerable to oxidative damage [31], and the male mutational bias [42,46], has led to interest in human fertility and paternal effects. Male fitness is a function of mating opportunities, sperm performance and offspring viability [33,44], which can be separated under experimental conditions [e.g., 47,48].…”

Section: Desirable Study Systems To Fill Key Voidsmentioning

confidence: 99%

“…Fertility increases with size (age), as larger females produce more eggs. Males do not compete for territories [49,50], but post-ejaculatory sexual selection [44] occurs due to sperm competition [50]. Larger (older) fish generally produce more sperm, and thus would gain paternity advantages (fertility) under a fair raffle system [51].…”

Section: Desirable Attributesmentioning

confidence: 99%

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A synthesis of senescence predictions for indeterminate growth, and support from multiple tests in wild lake trout

Purchase

Rooke

Gaudry

et al. 2021

Preprint

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Senescence, or the deterioration of functionality with age, varies widely across taxa in pattern and rate. Insights into why and how this variation occurs are hindered by the predominance of lab-focused research on short-lived model species with determinate growth. We synthesize evolutionary theories of senescence, highlight key information gaps, and clarify predictions for species with low mortality and variable degrees of indeterminate growth. Lake trout are an ideal species to evaluate predictions in the wild. We monitored individual males from two populations (1976-2017) longitudinally for changes in adult mortality (actuarial senescence) and body condition (proxy for energy balance). A cross-sectional approach (2017) compared young (ages 4-10 years) and old (18-37 years) adults for (1) phenotypic performance in body condition, and semen quality - which is related to fertility under sperm competition (reproductive senescence), and (2) relative telomere length (potential proxy for cellular senescence). Adult growth in these particular populations is constrained by a simplified food web, and our data support predictions of negligible senescence when maximum size is only slightly larger than maturation size. Negative senescence (aka reverse senescence) may occur in other lake trout populations where diet shifts allow maximum sizes to be much larger than maturation size.

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Section: Methodsmentioning

confidence: 99%

Section: Desirable Study Systems To Fill Key Voidsmentioning

confidence: 99%

Section: Desirable Study Systems To Fill Key Voidsmentioning

confidence: 99%

Section: Desirable Attributesmentioning

confidence: 99%

See 2 more Smart Citations

A synthesis of senescence predictions for indeterminate growth, and support from multiple tests in wild lake trout

Purchase

Rooke

Gaudry

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…ability to attract a mate), but additionally on gametes [30,[42][43][44]. Gamete senescence affects the fitness of the individual, but also its mate and offspring [44,45]. However, separating effects among parents, gametes and offspring is difficult, especially in internal fertilizers.…”

Section: (I) the Special Problem Of Sperm Senescencementioning

confidence: 99%

A synthesis of senescence predictions for indeterminate growth, and support from multiple tests in wild lake trout

et al. 2022

Self Cite

View full text Add to dashboard Cite

Senescence—the deterioration of functionality with age—varies widely across taxa in pattern and rate. Insights into why and how this variation occurs are hindered by the predominance of laboratory-focused research on short-lived model species with determinate growth. We synthesize evolutionary theories of senescence, highlight key information gaps and clarify predictions for species with low mortality and variable degrees of indeterminate growth. Lake trout are an ideal species to evaluate predictions in the wild. We monitored individual males from two populations (1976–2017) longitudinally for changes in adult mortality (actuarial senescence) and body condition (proxy for energy balance). A cross-sectional approach (2017) compared young (ages 4–10 years) and old (18–37 years) adults for (i) phenotypic performance in body condition, and semen quality—which is related to fertility under sperm competition (reproductive senescence)—and (ii) relative telomere length (potential proxy for cellular senescence). Adult growth in these particular populations is constrained by a simplified foodweb, and our data support predictions of negligible senescence when maximum size is only slightly larger than maturation size. Negative senescence (aka reverse senescence) may occur in other lake trout populations where diet shifts allow maximum sizes to greatly exceed maturation size.

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Does post-ejaculatory sperm experience prior to fertilization alter offspring performance beyond paternity in an external fertilizing fish?

Wagle,

Purchase

2024

Preprint

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Recent research has suggested that the environment encountered by sperm post-ejaculation may impact offspring development beyond the transfer of the paternal genome. The mechanisms that underlie such effects remain unclear, but two non-mutually exclusive processes have been proposed. 1) Haploid selection, whereby stressful conditions act as stronger post-ejaculation pre-fertilization selective pressures on semen than under benign situations, resulting in the fertilization of, on average higher quality sperm and the production of offspring that exhibit superior performance across all environmental conditions that they might encounter. 2) Epigenetic inheritance, where environmental conditions induce changes in sperm that are passed down to offspring, resulting in altered gene expression in offspring. This would be adaptive if sperm experiences anticipate what is to come and improve offspring performance to match those conditions. Capelin (Mallotus villosus) sperm and embryos are sensitive to salinity and may represent a good system to investigate these phenomena. We used a split-ejaculate and split-brood experimental block design to expose capelin sperm to known benign (25 psu) and stressful (35 psu) salinity prior to egg contact, and split each batch of fertilized eggs for incubation at matched and mismatched salinity to those of sperm exposure. Our findings revealed no differences in hatch characteristics between offspring produced by sperm exposed to benign and stressful salinity conditions. A follow-up experiment found the same result with an increased selection gradient at 5 psu and 35 psu. Our study does not support the hypothesis that sperm experiences exert an influence on the development of offspring characteristics, independent of paternity. Instead, our results suggest that the sole influential factor in sperm determining offspring characteristics is the transfer of the paternal genome.

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Integrating natural and sexual selection across the biphasic life cycle

Cited by 6 publications

References 69 publications

A synthesis of senescence predictions for indeterminate growth, and support from multiple tests in wild lake trout

A synthesis of senescence predictions for indeterminate growth, and support from multiple tests in wild lake trout

A synthesis of senescence predictions for indeterminate growth, and support from multiple tests in wild lake trout

Does post-ejaculatory sperm experience prior to fertilization alter offspring performance beyond paternity in an external fertilizing fish?

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