Application of artificial insemination technique to eupyrene and/or apyrene sperm in <i>Bombyx mori</i>

Sahara, Ken; Takemura, Yoko

doi:10.1002/jez.a.10250

Cited by 28 publications

(17 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Parasperm function in the majority of sperm‐heteromorphic species has never been investigated, but there are a few species from the Lepidoptera, the Drosophila obscura species group and the stalk‐eyed flies (Diopsidae), which have been extensively studied. For example, in Lepidoptera, empirical support has been found for both the cheap filler hypothesis (Cook & Wedell, 1999) and the facilitation hypothesis (Sahara & Takemura, 2003). Research on the obscura group of Drosophilids, in particular D. pseudoobscura , has empirically rejected the nutrition (Snook & Markow, 1996) and blocking hypotheses (Snook, 1998) and cast doubt on the cheap filler hypothesis (Snook, 1998).…”

Section: List Of Hypotheses For the Evolution Of Infertile Paraspermmentioning

confidence: 99%

Spermicide, cryptic female choice and the evolution of sperm form and function

Holman

Snook

2006

Journal of Evolutionary Biology

View full text Add to dashboard Cite

Sperm competition and cryptic female choice profoundly affect sperm morphology, producing diversity within both species and individuals. One type of within‐individual sperm variation is sperm heteromorphism, in which each male produces two or more distinct types of sperm simultaneously, only one of which is typically fertile (the ‘eusperm’). The adaptive significance of nonfertile ‘parasperm’ types is poorly understood, although numerous sperm‐heteromorphic species are known from many disparate taxa. This paper examines in detail two female‐centred hypotheses for the evolution and maintenance of this unconventional sperm production strategy. First, we use game theoretical models to establish that parasperm may function to protect eusperm from female‐generated spermicide, and to elucidate the predictions of this idea. Second, we expand on the relatively undeveloped idea that parasperm are used by females as a criterion for cryptic female choice, and discuss the predictions generated by this idea compared to other hypotheses proposed to explain sperm heteromorphism. We critically evaluate both hypotheses, suggest ways in which they could be tested, and propose taxa in which they could be important.

show abstract

Section: List Of Hypotheses For the Evolution Of Infertile Paraspermmentioning

confidence: 99%

Spermicide, cryptic female choice and the evolution of sperm form and function

Holman

Snook

2006

Journal of Evolutionary Biology

View full text Add to dashboard Cite

show abstract

“…In certain invertebrate species, such as Bombyx mori, it has been suggested that non-fertile sperm aid the successful transfer of the fertile sperm to the site of sperm storage or fertilization in the female [51]. It has been suggested that some morphological forms of human sperm have evolved to perform different roles in relation to sperm competition (e.g.…”

Section: The Question Arises However: What Is the Function Of These mentioning

confidence: 99%

Post-Coital Sperm Competence in Polygamous Animals: The Role of Sperm Traits in Species?Specific Strategies

Santiago-Moreno¹,

Esteso²,

Castaño³

et al. 2015

Andrology

View full text Add to dashboard Cite

In some species, the females may mate with more than one male. In these polygamous animals, both pre-coital and post-coital strategies are required for reproductive success. This mini review aims at providing an update of the role of sperm traits in species-specific strategies for post-coital sperm competence. According to the spermcompetition theory, in such species the reproductive success of the males then depends upon both the magnitude of inter-male rivalry and covert sperm competition. The number of inseminated sperm, the percentage of sperm without morphological abnormalities in the ejaculates, and the sperm velocity variables play a significant role in sperm competition. Therefore, males that transfer more sperm per ejaculate or who copulate more often, are more likely to sire offspring. The transfer of large numbers of sperm is also guaranteed by ejaculates with high sperm concentrations. Usually, males of polygamous species have large testes and produce ejaculates with high sperm concentrations. Sperm competition acts as a selective force driving evolutionary change in sperm morphology and function. The degree of sperm pleiomorphy shown by a species varies according to the degree of sperm competition its behaviour entails. For example, the ejaculates of very polygamous species have much more homogenous sperm with lower sperm abnormalities. Finally, recent studies in birds have shown that the straight-line velocity (VSL) value, the most accurate estimate of sperm cell velocity, is of great importance in competition scenarios. Thus, sperm with a higher VSL affords a male fertilization advantages over his rivals.

show abstract

“…Many of these suggest that apyrene sperm have a supporting role, for example in aiding eupyrene sperm transport or activating the eupyrene sperm (e.g. Osanai et al, 1986Osanai et al, , 1987Sahara and Takemura, 2003). Alternatively, they may represent a nutrient source either for the fertile sperm in the spermatheca, or for the female and the developing zygotes.…”

Section: Spermmentioning

confidence: 99%

Female receptivity in butterflies and moths

Wedell

2005

Journal of Experimental Biology

136

View full text Add to dashboard Cite

SUMMARY Female receptivity in butterflies and moths is influenced by a multitude of factors that vary between virgin and mated females, and is often affected by the quality and persistence of courting males. Mated females of polyandrous species frequently display a period of non-receptivity following mating, often resulting from factors transferred by the male at mating. Some of these compounds have a transient effect (e.g. anti-aphrodisiacs and mating plugs),whereas others induce long-term suppression of receptivity (i.e. sperm and seminal factors). Sperm appear to generally induce long-term suppression of female receptivity in both butterflies and moths. In some species, production of non-fertile sperm may function to fill the female's sperm storage organ and switch off receptivity, although whether this is a general phenomenon across the Lepidoptera has not yet been examined. Examination of seminal fluids suppressing female receptivity in moths suggests that more than one factor is implicated, but frequently the transfer or stimulation of Juvenile Hormone production is involved. Surprisingly, potential seminal factors influencing female receptivity in butterflies remain largely unexplored. In this review, I summarize the various factors that are known to affect female receptivity in the Lepidoptera to date, and briefly compare the function and similarity of the Pheromone Suppressing Peptide (HezPSP) in moths to that of the Sex Peptide in Drosophila melanogaster (DrmSP). The exciting possibility that seminal peptides in the Lepidoptera and Diptera (e.g. Drosophila melanogaster) may have shared functionality is discussed.

show abstract

Application of artificial insemination technique to eupyrene and/or apyrene sperm in Bombyx mori

Cited by 28 publications

References 21 publications

Spermicide, cryptic female choice and the evolution of sperm form and function

Spermicide, cryptic female choice and the evolution of sperm form and function

Post-Coital Sperm Competence in Polygamous Animals: The Role of Sperm Traits in Species?Specific Strategies

Female receptivity in butterflies and moths

Contact Info

Product

Resources

About