No support for cryptic choice by ovarian fluid in an external fertilizer

Kleppe, April Snøfrid; Nordeide, Jarle Tryti; Rudolfsen, Geir; Figenschou, Lars; Larsen, Berner; Reiss, Katrin; Folstad, Ivar

doi:10.1002/ece3.4628

Cited by 7 publications

(6 citation statements)

References 73 publications

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“…Although many of these studies implicate FRF as a critical moderator of sperm competition, not all of them have revealed consistent effects. For example, studies of the quacking frog (Crinia georgiana) [46], lake trout (Salvelinus namaycush) [58], arctic charr [59] and capelin (Mallotus villosus) [60] reported no evidence for male-by-female interaction effects moderated by the FRF. Similarly, in the ant (Acromyrmex echinatior), there is no evidence of FRF-mediated inbreeding avoidance [26].…”

Section: (B) Differential Effects Of Female Reproductive Fluid On Spementioning

confidence: 99%

The role of female reproductive fluid in sperm competition

Gasparini

Pilastro

Evans

2020

Phil. Trans. R. Soc. B

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The role of non-gametic components of the ejaculate (seminal fluid) in fertility and sperm competitiveness is now well established. Surprisingly, however, we know far less about female reproductive fluid (FRF) in the context of sexual selection, and insights into male–FRF interactions in the context of sperm competition have only recently emerged. Despite this limited knowledge, evidence from taxonomically diverse species has revealed insights into the effects of FRF on sperm traits that have previously been implicated in studies of sperm competition. Specifically, through the differential effects of FRF on a range of sperm traits, including chemoattraction and alterations in sperm velocity, FRF has been shown to exert positive phenotypic effects on the sperm of males that are preferred as mating partners, or those from the most compatible or genetically diverse males. Despite these tantalizing insights into the putative sexually selected functions of FRF, we largely lack a mechanistic understanding of these processes. Taken together, the evidence presented here highlights the likely ubiquity of FRF-regulated biases in fertilization success across a diverse range of taxa, thus potentially elevating the importance of FRF to other non-gametic components that have so far been studied largely in males. This article is part of the theme issue ‘Fifty years of sperm competition'.

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Section: (B) Differential Effects Of Female Reproductive Fluid On Spementioning

confidence: 99%

The role of female reproductive fluid in sperm competition

Gasparini

Pilastro

Evans

2020

Phil. Trans. R. Soc. B

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“…On the other hand, studies have also demonstrated that OF can have a limited or negative impact on spermatozoa performance [13,51,52]. For instance, in rainbow trout, OF from particular females inhibited spermatozoa motility, while other OF samples initiated motility and dissimilarly affected spermatozoa performance [13,52].…”

Section: Ovarian Fluid Impacts On Spermatozoamentioning

confidence: 99%

Ovarian fluid and its impacts on spermatozoa performance in fish: A review

et al. 2019

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Factors such as gamete quality can profoundly affect fertility, but the spawning microenvironment that surrounds the spermatozoa and eggs during gamete contact has largely been neglected. In fishes, understanding these gametic interactions is crucial because each female creates a unique spawning environment by simultaneously expelling her distinct ovarian fluid (OF) along with an egg batch. In turn, OF has been shown to influence spermatozoa performance traits by modifying spermatozoa behaviors and fertilization outcomes. Here, we shed light on these gametic interactions by overviewing literature on OF and how it impacts spermatozoa performance traits. Fish OF is clear or has slight coloration and can constitute ≤10-30% of egg mass. Viscosity of the OF is ~2-to 3-fold higher than water and its pH ranges 6.2 to 8.8. Osmolality of the OF is lower in freshwater (190-322 mOsmol/kg) than marine species (289-514 mOsmol/kg). Na + (98.3-213.7 mmol/L) and Cl -(89.8-172.7 mmol/L) are predominant ions in OF, while K + (1.7-19.3 mmol/L), Mg 2+ (0.4-8.1 mmol/L), and Ca 2+ (0.5-9.7 mmol/L) ions are detected at lower concentrations. Protein levels can be high in OF and exhibit intra-and inter-species variation (54-826 mg/100mL). Fish OF also contains a series of organic components and substances that enhance and/or attract sperm towards the vicinity of an egg. OF can also differentially impact sperm based on genetic relatedness of mates, male phenotype (i.e. alternative reproductive tactics), or geographic origin. To conclude, when testing further reproductive paradigms, we suggest a shift from classic spermatozoa activation medium (water only) to more natural spawning media, which encompass OF-spermatozoa interactions.

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“…, can be modified by female reproductive fluids (Yeates et al, 2013;Holt & Fazeli, 2015;Alonzo et al, 2016;Rosengrave et al, 2016;Lymbery et al, 2017; but see Kleppe et al, 2018)). For example, in broadcast spawners, such as the mussel (Mytilus galloprovincialis), sperm chemotaxis via exposure to 'egg water' differentially affects sperm velocity and patterns of motility depending on the combinatorial identities of the male and females contributing to the interaction (Lymbery et al, 2017).…”

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confidence: 99%