...Cornelia Wetzker; Christin Froschauer; Christian Massino; Klaus Reinhardt ABSTRACT Males and females of many species store sperm for extended periods. During storage, sperm are predicted to undergo cellular and functional changes, especially towards glycolytic energy metabolism because oxygen...

...Callum S. McDiarmid; Laura L. Hurley; Madiline Le Mesurier; Andrew C. Blunsden; Simon C. Griffith ABSTRACT Sperm traits can influence fertilisation success, but there is still much we do not understand about sperm condition dependence, that is, how much sperm traits depend on the male's energy...

..., male fertility is particularly sensitive to elevated temperature. Previously, we have shown in the model nematode Caenorhabditis elegans that all males are fertile at 20°C, but almost all males have lost fertility at 27°C. Male fertility is dependent on the production of functional sperm, successful...

...Jukka Kekäläinen; Párástu Oskoei; Matti Janhunen; Heikki Koskinen; Raine Kortet; Hannu Huuskonen ABSTRACT The sperm pre-fertilization environment has recently been suggested to mediate remarkable transgenerational consequences for offspring phenotype (transgenerational plasticity, TGB...

...Francisco Dávila; Anne Botteaux; David Bauman; Sarah Chérasse; Serge Aron ABSTRACT Bacteria can damage sperm and thus reduce the reproductive success of both males and females; selection should therefore favour the evolution of antimicrobial protection. Eusocial hymenopterans might be particularly...

... ( Murtaugh and Denlinger, 1982 ). Male crickets pass this PGE 2 to females with the rest of the ejaculate (testicular and accessory gland material) in a small package called a spermatophore. During copulation, the spermatophore is placed into the female's genitalia so that sperm and seminal fluids can...

...Dustin J. Marshall; Hans H. Hoppeler Traditionally, it has been assumed that sperm are a vehicle for genes and nothing more. As such, the only source of variance in offspring phenotype via the paternal line has been genetic effects. More recently, however, it has been shown that the phenotype...

... exposed from birth to one of four temperature treatments: 23, 25 (control), 28 or 30°C. We measured brood survival and, at sexual maturity, male ornamentation, sperm traits and immune response. Our results show that increases in temperature result in guppies that have shorter, slower sperm...

...Patrick J. Krug; Jeffrey A. Riffell; Richard K. Zimmer SUMMARY Red abalone ( Haliotis rufescens ) sperm detect a waterborne chemical cue released by conspecific eggs, and change their swimming behavior to increase the likelihood of fertilization success. Previously, we isolated the natural sperm...

... to play an important role in fertilization, though separate accounting of the effects of chemoattraction,chemokinesis, sperm agglomeration and the other possible roles of the jelly coat have not been reported. In the present study, we used a microfluidic device that allowed determination...

.... `Programmed sperm degradation' on a periodic basis or an innate sperm`expiry date' have never been shown. This manuscript describes a newly discovered molt-dependent mechanism by which old sperm is periodically removed from the reproductive system of male Litopenaeus vannamei shrimp. Firstly, it is shown...

...Masaya Morita; Akira Nishikawa; Ayako Nakajima; Akira Iguchi; Kazuhiko Sakai; Akihiro Takemura; Makoto Okuno SUMMARY Corals perform simultaneous mass spawning around the full moon. Most Acropora species release gamete bundles, which are a complex of eggs and sperm, into the seawater. Then, gamete...

...Ayako Nakajima; Masaya Morita; Akihiro Takemura; Shinji Kamimura; Makoto Okuno SUMMARY Increased intracellular pH ([pH] i ) activates dynein in sea urchin and mammalian sperm and induces activation of flagellar motility. It is thought that cAMP-dependent protein phosphorylation is associated...

...-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...

...Margaret C. Bloch Qazi; Mariana F. Wolfner SUMMARY Female sperm storage is an essential component of reproduction in many animals. In insects, female sperm storage affects fecundity, sperm competition/preference and receptivity to re-mating. Female sperm storage consists of several stages...

...R. L. Ingermann; M. Holcomb; M. L. Robinson; J. G. Cloud SUMMARY Maintenance of sperm at pH values less than approximately 7.5 inhibited the onset of motility when sperm were subsequently diluted with water; maintenance at pH values above approximately 8.2 was associated with maximal motility upon...

...Jeffrey A. Riffell; Patrick J. Krug; Richard K. Zimmer SUMMARY Chemical communication between sperm and egg is a key factor mediating sexual reproduction. Dissolved signal molecules that cause sperm to orient and accelerate towards an egg could play pivotal roles in fertilization success...

...Christopher C. Gee; Richard K. Zimmer-Faust ABSTRACT The measurement of sperm motility is critical when studying fertilization kinetics and chemotaxis. Analysis of motility has traditionally been carried out on cells in small fluid volumes on microscope slides. Several theoretical treatments...

..., milt (sperm and seminal fluid) volume and sexual activity, effects hypothesized to increase male reproductive success in the sperm competition of multi-male spawnings. The present study tested this hypothesis by determining whether overnight exposure to 17,20βP increases fertility. In pair spawnings...

... symmetry. After a latent period of some 15s, there is a second large and rapid increase in [Ca 2+ ] i localized to the region of sperm–egg contact: during the latent period [Ca 2+ ] i does not change but within 1s of the end of the latent period [Ca 2+ ] i reaches 2 μ mol l - 1 . The calcium wave...