Sperm bundle and reproductive organs of carabid beetles tribe Pterostichini (Coleoptera: Carabidae)

Sasakawa, Kôji

doi:10.1007/s00114-006-0200-4

Cited by 43 publications

(46 citation statements)

References 22 publications

(18 reference statements)

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“…In contrast to our findings, female D. melanogaster with longer seminal receptacles favor males producing longer sperm so that selection drives the evolutionary exaggeration of sperm length (24,25). Genetic covariances between female morphologies that bias paternity toward males with particular sperm characteristics are likely to underlie the increasing number of comparative analyses that are revealing evolutionary associations between sperm morphology and female reproductive tract morphology (19)(20)(21)(22)(23)34). The contrasting findings for Onthophagus and Drosophila illustrate how postcopulatory female preferences can generate divergent patterns of evolution across taxa and contribution to the rapid and divergent variation that is characteristic of sperm morphology.…”

Section: Discussioncontrasting

confidence: 96%

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Quantitative genetic correlation between trait and preference supports a sexually selected sperm process

Simmons

Kotiaho

2007

Proc. Natl. Acad. Sci. U.S.A.

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Sperm show patterns of rapid and divergent evolution that are characteristic of sexual selection. Sperm competition has been proposed as an important selective agent in the evolution of sperm morphology. However, several comparative analyses have revealed evolutionary associations between sperm length and female reproductive tract morphology that suggest patterns of male-female coevolution. In the dung beetle Onthophagus taurus, males with short sperm have a fertilization advantage that depends on the size of the female's sperm storage organ, the spermatheca; large spermathecae select for short sperm. Sperm length is heritable and is genetically correlated with male condition. Here we report significant additive genetic variation and heritability for spermatheca size and genetic covariance between spermatheca size and sperm length predicted by both the ''goodsperm'' and ''sexy-sperm'' models of postcopulatory female preference. Our data thus provide quantitative genetic support for the role of a sexually selected sperm process in the evolutionary divergence of sperm morphology, in much the same manner as precopulatory female preferences drive the evolutionary divergence of male secondary sexual traits.male-female coevolution ͉ postcopulatory female choice ͉ sperm length F emale mating preferences are widely recognized as being responsible for the rapid and divergent evolution of male secondary sexual traits (1). Indicator or good gene models envisage genetic coupling between male sexual trait expression and offspring fitness, so that females with a preference for male traits produce offspring of greater viability (2). Once a preference becomes established, females choosing males with elaborate secondary sexual traits will produce sons that carry alleles for the trait and daughters that carry alleles for the preference, generating genetic coupling that will drive self-reinforcing coevolution of both trait and preference because of the mating advantage to males with the trait. Thus, the original viability benefits associated with the preference can be undermined by a runaway Fisherian sexy sons process (2). Analogous models have been proposed for postcopulatory female preferences (3). ''Good-sperm'' models predict positive genetic associations between a male's sperm competitiveness and the general viability of his offspring (4), whereas ''sexy-sperm'' models predict that multiply mating females produce sons successful in sperm competition and daughters that incite sperm competition through multiple mating (5, 6). As with precopulatory processes, postcopulatory models predict that the trait in males that determines fertilization success will become genetically coupled with the mechanism by which females bias sperm use toward preferred males (7).Although spermatozoa are well known for their rapid and divergent morphological variation (8, 9), little is known of the selective processes that drive sperm evolution. Patterns of divergent evolution are characteristic of strong sexual selection, and researchers have sugges...

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Section: Discussioncontrasting

confidence: 96%

“…Associations between sperm lengths and the lengths of female reproductive ducts and/or sperm storage organs are well documented in the insects (19)(20)(21)(22)(23). These patterns of correlated evolution implicate selection processes imposed by females during the evolution of sperm morphology.…”

mentioning

confidence: 91%

Quantitative genetic correlation between trait and preference supports a sexually selected sperm process

Simmons

Kotiaho

2007

Proc. Natl. Acad. Sci. U.S.A.

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“…Like other members of the tribe Pterostichini (Takami 2002(Takami , 2007Sasakawa 2006Sasakawa , 2007Takami and Sota 2007), male P. nigrita deposit a spermatophore, of unknown composition, containing sperm bundles (spermiozeugmata) that were formed in the vas deferens (Ferenz 1986;Hodgson et al 2012), in the bursa copulatrix of the female during copulation . The spermatophore may be formed by secretions from a pair of accessory glands that join the vasa deferentia which in turn open into the male's ejaculatory duct (Ferenz 1986;Hodgson et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Structure of the male reproductive accessory glands ofPterostichus nigrita(Coleoptera: Carabidae), their role in spermatophore formation

Krüger

Ferenz

Randall

et al. 2013

Invertebrate Reproduction & Development

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Accessory gland secretions of male insects have many important functions including the formation of spermatophores. We used light and electron microscopy to investigate the structure of the accessory glands and posterior vasa deferentia of the carabid beetle Pterostichus nigrita to try to determine where spermatophore material is produced. Each accessory gland and posterior vas deferens had an outer layer of longitudinal muscle, beneath which was a layer of connective tissue and a thin band of circular muscle, all of which surrounded a layer of epithelial cells lining the lumen of the ducts. Based on the ultrastructure of the epithelial cells, and their secretory products, we identified two epithelial cell types in each region (distal and proximal) of the accessory glands and four types in the posterior vas deferens. Most secretory products, which stained positively for proteins and some mucins, were released into the lumen of the ducts by apocrine secretion. The accessory glands produced one type of secretory product whereas in posterior vasa deferentia, four types of secretory products were found layered in the lumen. Our results suggest that most of the structural material used to construct a spermatophore is produced by the cells of the posterior vasa deferentia.

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“…Within the Carabidae, spermatozoa morphology has already been analysed in the taxa Cicindelinae [9], Scaritinae [10], Carabinae [11, 12], Pterostichini [13–17] and Platynini [18]. Cicindelidae and Scaritinae species do not form sperm bundles (spermiozeugmata).…”

Section: Introductionmentioning

confidence: 99%

“…Within the Pterostichini , the flagella are completely movable within the conjugate, or they are attached to the spermatostyle [17]. In some species, the spermatostyles can be longer than the spermatozoa [14], and they are able to form spirals, such as in Abax parallelpipidus Piller et Mitterpacher 1783 (Carabidae: Pterostichini), producing a 17-times twisted spiral formed by a central spermatostyle where spermatozoa are attached [19].…”

Section: Introductionmentioning

confidence: 99%

Male reproductive system and spermatogenesis of Limodromus assimilis (Paykull 1790)

et al. 2017

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Based on advanced light and electron microscopy, we describe the male reproductive system and sperm development of Limodromus assimilis. The genital tract consists of pairs of uni-follicular testes, spermatic ducts with diverticula regions, seminal vesicles, accessory glands, an unpaired ejaculatory duct and an aedeagus containing an internal sac equipped with sclerotic scales. Based on their morphology, we draw conclusions about their functions. After spermatogenesis within the follicle, the spermatozoa become released from the sperm cysts. The single spermatozoa move into the diverticula of the vasa deferentia I. Here, they become attached to central rods (spermatostyles), forming secondary conjugates (spermiozeugmata). The coordinated flagella movement of the conjugates possibly improves sperm velocity. Using super-resolution microscopy, we identified highly condensed reticulate chromatin in the lancet-shaped spermatozoa heads and the mitochondrial derivates of the flagella, likely formed by genomic and mitochondrial DNA, respectively. The results show, for the first time, sperm bundle formation in a Platynini species mainly corresponding to that found in Pterostichini species.

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Sperm bundle and reproductive organs of carabid beetles tribe Pterostichini (Coleoptera: Carabidae)

Cited by 43 publications

References 22 publications

Quantitative genetic correlation between trait and preference supports a sexually selected sperm process

Quantitative genetic correlation between trait and preference supports a sexually selected sperm process

Structure of the male reproductive accessory glands ofPterostichus nigrita(Coleoptera: Carabidae), their role in spermatophore formation

Male reproductive system and spermatogenesis of Limodromus assimilis (Paykull 1790)

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