Relationships between body size and secondary sexual characters, and sperm characters in male Dolly Varden char (<i>Salvelinus malma</i>)

Yamamoto, Toshiaki; Hirohashi, Noritaka; Fujiwara, Eiji; Suzuki, Tatsuya; Maruta, Hatsuna; Omiya, Hirotake; Kumano, Shigeru

doi:10.1111/eff.12283

Cited by 8 publications

(8 citation statements)

References 38 publications

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“…We note that there may be functional or resource‐allocation trade‐offs among sperm traits. For example, studies have recorded a negative within‐species correlation between sperm swimming speed and sperm longevity (Levitan, 2000; Yamamoto et al ., 2017; Taborsky et al ., 2018), and between sperm length and sperm longevity (Gage et al ., 2002). However, such trade‐offs are far from universal (Snook, 2005), and the traits that are important for male fertilisation success differ across species (Simmons & Fitzpatrick, 2012).…”

Section: Methodsmentioning

confidence: 99%

Male alternative reproductive tactics and sperm competition: a meta‐analysis

et al. 2022

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In many animal species, males may exhibit one of several discrete, alternative ways of obtaining fertilisations, known as alternative reproductive tactics (ARTs). Males exhibiting ARTs typically differ in the extent to which they invest in traits that improve their mating success, or the extent to which they face sperm competition. This has led to the widespread prediction that males exhibiting ARTs associated with a high sperm competition risk, or lower investment into traits that improve their competitiveness before mating, should invest more heavily into traits that improve their competitiveness after mating, such as large ejaculates and high-quality sperm. However, despite many studies investigating this question since the 1990s, evidence for differences in sperm and ejaculate investment between male ARTs is mixed, and there has been no quantitative summary of this field. Following a systematic review of the literature, we performed a meta-analysis examining how testes size, sperm number and sperm traits differ between males exhibiting ARTs that face either a high or low sperm competition risk, or high or low investment in traits that increase mating success. We obtained data from 92 studies and 67 species from across the animal kingdom. Our analyses showed that male fish exhibiting ARTs facing a high sperm competition risk had significantly larger testes (after controlling for body size) than those exhibiting tactics facing a low sperm competition risk. However, this effect appears to be due to the inappropriate use of the gonadosomatic index as a body-size corrected measure of testes investment, which overestimates the difference in testes investment between male tactics in most cases. We found no significant difference in sperm number between males exhibiting different ARTs, regardless of whether sperm were measured from the male sperm stores or following ejaculation. We also found no significant difference in sperm traits between males exhibiting different ARTs, with the exception of sperm adenosine triphosphate (ATP) content in fish. Finally, the difference in post-mating investment between male ARTs was not influenced by the extent to which tactics were flexible, or by the frequency of sneakers in the population. Overall, our results suggest that, despite clear theoretical predictions, there is little evidence that male ARTs differ substantially in investment into sperm and ejaculates across species. The incongruence between theoretical and empirical results could be explained if (i) theoretical models fail to account for differences in overall resource levels between males exhibiting different ARTs or fundamental trade-offs between investment into different ejaculate and sperm traits, and (ii) studies often use sperm or ejaculate traits that do not reflect overall post-mating investment accurately or affect fertilisation success.

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Section: Methodsmentioning

confidence: 99%

Male alternative reproductive tactics and sperm competition: a meta‐analysis

et al. 2022

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“…Across passerine birds, for example, the sperm swimming speed is positively correlated with the risk of sperm competition and negatively associated with the duration of FSS (Kleven et al., 2009). Evidence of a trade‐off between sperm swimming velocity and survival has also been found within species (Burness, Casselman, Schulte‐Hostedde, Moyes, & Montgomerie, 2004; Levitan, 2000; Taborsky, Schütz, Goffinet, & van Doorn, 2018; Yamamoto et al., 2017), although positive correlations have also been found (Locatello, Rasotto, Evans, & Pilastro, 2006).…”

Section: Introductionmentioning

confidence: 86%

Female sperm storage mediates post‐copulatory costs and benefits of ejaculate anticipatory plasticity in the guppy

Cardozo

Devigili

Antonelli

et al. 2020

J of Evolutionary Biology

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Males of many species evolved the capability of adjusting their ejaculate phenotype in response to social cues to match the expected mating conditions. When females store sperm for a prolonged time, the expected fitness return of plastic adjustments of ejaculate phenotype may depend on the interval between mating and fertilization. Although prolonged female sperm storage (FSS) increases the opportunity for sperm competition, as a consequence of the longer temporal overlap of ejaculates from several males, it may also create variable selective forces on ejaculate phenotype, for example by exposing trade‐offs between sperm velocity and sperm survival. We evaluated the relationship between the plasticity of ejaculate quality and FSS in the guppy, Poecilia reticulata, a polyandrous live‐bearing fish in which females store sperm for several months and where stored sperm contribute significantly to a male's lifelong reproductive success. In this species, males respond to the perception of future mating opportunities by increasing the quantity (number) and quality (swimming velocity) of ready‐to‐use sperm (an anticipatory response called ‘sperm priming’). Here we investigated (a) the effect of sperm priming on in vitro sperm viability at stripping and its temporal decline (as an estimate of sperm survival), and (b) the in vivo competitive fertilization success in relation to female sperm storage using artificial insemination. As expected, sperm‐primed males produced more numerous and faster sperm, but with a reduced in vitro sperm viability at stripping and after 4 hr, compared with their counterparts. Artificial insemination revealed that the small (nonsignificant) advantage of primed sperm when fertilization immediately follows insemination is reversed when eggs are fertilized by female‐stored sperm, weeks after insemination. By suggesting a plastic trade‐off between sperm velocity and viability, these results demonstrate that prolonged female sperm storage generates divergent selection pressures on ejaculate phenotype.

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“…Trade-offs also exist among sperm traits, such as between sperm performance and longevity (Levitan, 2000;Snook, 2005;Yamamoto et al, 2017). For example, in the shell-brooding cichlid Lamprologus callipterus, bourgeois males are too large to fit inside the shells where females spawn, yet parasitically spawning dwarf males fit inside and thus are able to release their sperm closer to the female than the bourgeois males.…”

Section: Introductionmentioning

confidence: 99%