No effect of mate novelty on sexual motivation in the freshwater snail Biomphalaria glabrata

Häderer, Ines K.; Werminghausen, Johanna; Michiels, Nico K.; Timmermeyer, Nadine; Anthes, Nils

doi:10.1186/1742-9994-6-23

Cited by 18 publications

(16 citation statements)

References 59 publications

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“…On the other hand, mate choice has been shown to involve pre-copulatory assessment of the mating status or novelty of the partner (e.g. [42][43][44], but see [45,46]). It seems probable that this kind of preference is linked to assessing cues that can serve as a proxy for the likelihood of encountering sperm competition, and that they are therefore strongly linked to post-copulatory sexual selection.…”

Section: Pre-versus Post-copulatory Sexual Selection In Simultaneous mentioning

confidence: 99%

Sex allocation and investment into pre- and post-copulatory traits in simultaneous hermaphrodites: the role of polyandry and local sperm competition

Schärer

Pen

2013

Phil. Trans. R. Soc. B

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Sex allocation theory predicts the optimal allocation to male and female reproduction in sexual organisms. In animals, most work on sex allocation has focused on species with separate sexes and our understanding of simultaneous hermaphrodites is patchier. Recent theory predicts that sex allocation in simultaneous hermaphrodites should strongly be affected by post-copulatory sexual selection, while the role of pre-copulatory sexual selection is much less clear. Here, we review sex allocation and sexual selection theory for simultaneous hermaphrodites, and identify several strong and potentially unwarranted assumptions. We then present a model that treats allocation to sexually selected traits as components of sex allocation and explore patterns of allocation when some of these assumptions are relaxed. For example, when investment into a male sexually selected trait leads to skews in sperm competition, causing local sperm competition, this is expected to lead to a reduced allocation to sperm production. We conclude that understanding the evolution of sex allocation in simultaneous hermaphrodites requires detailed knowledge of the different sexual selection processes and their relative importance. However, little is currently known quantitatively about sexual selection in simultaneous hermaphrodites, about what the underlying traits are, and about what drives and constrains their evolution. Future work should therefore aim at quantifying sexual selection and identifying the underlying traits along the pre- to post-copulatory axis.

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Section: Pre-versus Post-copulatory Sexual Selection In Simultaneous mentioning

confidence: 99%

Sex allocation and investment into pre- and post-copulatory traits in simultaneous hermaphrodites: the role of polyandry and local sperm competition

Schärer

Pen

2013

Phil. Trans. R. Soc. B

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“…Such increased motivation to mate with a novel partner, known as the Coolidge effect (Wilson et al, ), is in line with the idea that animals will allocate their ejaculates strategically if the transfer and/or production is energetically costly (Dewsbury, ; Pizzari et al, ; Koene and Ter Maat, ), thus corroborating the measurements of investment in L. stagnalis explained above. This same effect was hypothesized to occur in the sea hare, A. fasciata (Ziv et al, , but never experimentally tested), but was not found in the Ramshorn freshwater snail, B. glabrata (Häderer et al, ) and the sea slug, Chelidonura sandrana (Werminghausen et al, ).…”

Section: Measuring Gender Expression and Sex Allocationmentioning

confidence: 60%

Sex determination and gender expression: Reproductive investment in snails

Koene

2017

Molecular Reproduction Devel

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SUMMARYSex determination is generally seen as an issue of importance for separate‐sexed organisms; however, when considering other sexual systems, such as hermaphroditism, sex allocation is a less‐binary form of sex determination. As illustrated here, with examples from molluscs, this different vantage point can offer important evolutionary insights. After all, males and females produce only one type of gamete, whereas hermaphrodites produce both. In addition, sperm and accessory gland products are donated bidirectionally. For reciprocal mating, this is obvious since sperm are exchanged within one mating interaction; but even unilaterally mating species end up mating in both sexual roles, albeit not simultaneously. With this in mind, I highlight two factors that play an important role in how reproductive investment is divided in snails: First, the individual's motivation to preferentially donate rather than receive sperm (or vice versa) leads to flexible behavioral performance, and thereby investment, of either sex. Second, due to the presence of both sexual roles within the same individual, partners are potentially able to influence investment in both sexual functions of their partner to their own benefit. The latter has already led to novel insights into how accessory gland products may evolve. Moreover, the current evidence points towards different ways in which allocation to reproduction can be changed in simultaneous hermaphrodites. These often differ from the separate‐sexed situation, highlighting that comparison across different sexual systems may help identify commonalities and differences in physiological, and molecular mechanisms as well as evolutionary patterns. Mol. Reprod. Dev. 84: 132–143, 2017. © 2016 Wiley Periodicals, Inc.

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“…1998). A recent study on the snail Biomphalaria glabrata shows that this snail does not discriminate former partners against novel partners in a second mating event that took place one hour after the first (Häderer et al. 2009).…”

Section: Discussionmentioning

confidence: 99%

No Plastic Responses to Experimental Manipulation of Sperm Competition per se in a Free‐Living Flatworm

Sandner

Schärer

2010

Ethology

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In the absence of sperm competition evolutionary theory predicts low mating rates and low ejaculate expenditure per mating, and sex allocation theory for simultaneous hermaphrodites predicts a strongly female‐biased sex allocation. In the presence of sperm competition a shift towards a more male‐biased sex allocation and a higher ejaculate expenditure are predicted. The free‐living flatworm Macrostomum lignano has been shown to respond plastically in mating rate, testis size, and sperm transfer to manipulation of the social group size, a proxy of the strength of sperm competition. However, manipulation of social group size may manipulate not only sperm competition, but also other factors, such as food supply and metabolite concentration. In this study we therefore manipulated sperm competition per se by repeatedly exposing individuals to partners that have either mated with rivals or not, while keeping the social group size constant. Our results suggest that M. lignano does not have the ability to detect sperm competition per se, as worms experimentally exposed to the presence or absence of sperm competition did not differ in sex allocation, sperm transfer or mating behavior. A response to our manipulation would have required individual recognition, the ability to detect self‐referencing tags, or tags or traces left by rivals on or in the mating partners. We first discuss the possibility that highly efficient sperm displacement may have decreased the difference between the treatment groups and then propose three alternative cues that may allow M. lignano to respond plastically to the social group size manipulation used in earlier studies: assessment of the mating rate, chemical cues, or tactile cues.

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No effect of mate novelty on sexual motivation in the freshwater snail Biomphalaria glabrata

Cited by 18 publications

References 59 publications

Sex allocation and investment into pre- and post-copulatory traits in simultaneous hermaphrodites: the role of polyandry and local sperm competition

Sex allocation and investment into pre- and post-copulatory traits in simultaneous hermaphrodites: the role of polyandry and local sperm competition

Sex determination and gender expression: Reproductive investment in snails

No Plastic Responses to Experimental Manipulation of Sperm Competition per se in a Free‐Living Flatworm

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