Effects of gamma irradiation on the mechanisms of sperm transfer in Trichoplusia ni

Holt, G. G.; North, D. T.

doi:10.1016/0022-1910(70)90146-0

Cited by 55 publications

(26 citation statements)

References 8 publications

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“…In Lepidoptera, it is suggested that apyrene spermatozoa (without nucleus) pierces the testicular basement membrane and facilitates the migration of eupyrene spermatozoa (with nucleus) bundles to the efferent ducts and the displacement along the female reproductive tract (Holt and North, 1970;Katsuno, 1977;Etmann and Hooper, 1979). Other authors have proposed that apyrene spermatozoa would be responsible for the beginning of the capacity and acquisition of motility in the eupyrene spermatozoa via breaking of bundles by releasing endopeptidase enzymes (Osanai and Isono, 1997).…”

Section: Discussionmentioning

confidence: 96%

Ultrastructure and heteromorphism of spermatozoa in five species of bugs (Pentatomidae: Heteroptera)

Araújo

Lino‐Neto

Ramalho

et al. 2011

Micron

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Pentatomidae is one of the largest Heteroptera families, comprising about 10% of the species estimated for the suborder. In spite of existing studies, doubts remain regarding the systematics of Pentatomomorpha. In this study, five species of Pentatomidae spermatozoa were examined to achieve characteristics that enable inferences in the phylogeny of the group and in behavioral issues associated with the presence of polymorphisms. Spermatozoa polymorphisms, characterized by two classes of sizes, are found in Podisus nigrispinus, Podisus distinctus, and Brontocoris tabidus, whereas Thynacanta marginata (Dallas) and Supputius cincticeps have single-size spermatozoa. The head region consists of an acrosome, a nucleus, and part of the centriolar adjunct. In the more anterior region, the nucleus is parallel to the centriolar adjunct. In the nucleus-flagellum transition region, the nucleus overlaps the anterior region of the mitochondrial derivatives, just above the axoneme. The mitochondrial derivatives and the axoneme run the entire extent of the flagellum. In species in which the spermatozoa are polymorphic, the larger spermatozoa have derivatives mitochondrial approximately 3-fold larger than the smaller spermatozoa. Characteristics derived from the morphology of spermatozoa indicate synapomorphies and are promising for systematic studies.

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Section: Discussionmentioning

confidence: 96%

Ultrastructure and heteromorphism of spermatozoa in five species of bugs (Pentatomidae: Heteroptera)

Araújo

Lino‐Neto

Ramalho

et al. 2011

Micron

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“…Similarly, spermatophore size may be influenced by the number of successive matings of the males ("male matings") if resources for ejaculate production are limited (e.g., George and Howard 1968;Outram 197 1 ;Howell et al 1978). Moreover, male age frequently affects spermatophore size, particularly for species in which a period of sexual maturity is required (e.g., Callahan and Cascio 1963;Holt and North 1970;Sims 1979). However, changes in spermatophore size associated with a male's capacity for ejaculate production will influence male and female fitness only if it affects the quantity and (or) quality of the resultant progeny.…”

Section: Introductionmentioning

confidence: 99%

Interactions between body size and mating history influence the reproductive success of males of a tortricid moth, Zeiraphera canadensis

Carroll¹

1994

Can. J. Zool.

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CARROLL, A.L. 1994. Interactions between body size and mating history influence the reproductive success of males of a tortricid moth, Zeiraphera canadensis. Can. J. Zool . 72: 2 124 -2 132. The independent and interacting effects of male body size, age, and previous number of matings on (i) spermatophore size and (ii) female reproductive performance were examined in the laboratory using Zeiraphera canadensis Mut. & Free. (Lepidoptera: Tortricidae). Spermatophore size was not influenced by male age, but large males produced larger spermatophores and their size decreased with the number of consecutive matings. The capacity of males to produce spermatophores on successive days was size dependent. Large males produced well-defined spermatophores over five consecutive copulations, whereas small males were no longer able to produce a discernible spermatophore by the fourth mating. Male body size and mating history, independently or in combination, did not affect female fecundity or longevity despite their influence on spermatophore size, suggesting that potential spermatophore-derived nutrients were not utilized for reproduction or somatic maintenance. However, the number of previous matings on consecutive days influenced successful insemination as well as the receptivity of successfully inseminated females to additional matings. Moreover, the influence of multiple male matings on insemination success and mating receptivity was also size dependent. After several consecutive copulations, small males were less likely to successfully inseminate females and "switch off" the females7 mating receptivity than large males. The sizedependent decline in ability to inseminate and switch off females, independent of spermatophore size, suggests that small males were more limited than large ones in their capacity to produce accessory gland secretions other than those required for spermatophore construction. Large Z. canadensis males may experience higher reproductive success than small ones by inseminating more females over consecutive evenings and leaving fewer females receptive to remating. CARROLL, A.L. 1994. Interactions between body size and mating history influence the reproductive success of males of a tortricid moth, Zeiraphera canadensis. Can. J. Zool. 72 : 2 124 -2 1 32. Nous avons CtudiC en laboratoire les relations entre la masse, 17ige et le nombre de copulations prCalables chez les miles sur (i) la taille du spermatophore et (ii) le rendement reproductif des femelles d'une tordeuse, Zeiraphera canadensis Mut. et Free. (LCpidoptkra : Tortricidae). La taille du spermatophore n'est pas like a 17ige du mile, mais les miles de masse sup6 rieure produisent les plus gros spermatophores dont la taille diminue avec le nombre de copulations. La capacitC de productions successives de spermatophores est like a la masse des miles. Les miles de masse supkrieure produisent des spermatophores bien identifiables durant plus de cinq copulations, alors que les miles de masse infkrieure sont incapables de produire des spermatophores bien...

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“…However, there exist many other hypotheses about these elements. A category of the other hypotheses is that such elements only physically and chemically help sperm to move and live in the female's reproductive tract and to fertilize the egg, especially in Lepidoptera (Holt and North 1970;Friedlander and Gitay 1972;Katsuno 1977;Thibout 1981;Osanai et al 1987; see review by Koshio 1999). These roles are not directly concerned with nutrition or sperm competition, and may be feasible.…”

Section: Other Hypotheses and Predictionsmentioning

confidence: 98%

Can voluntary nutritional gifts in seminal flow evolve?

Kura

Yoda

2001

Journal of Ethology

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In many species that have internal fertilization, seminal flow includes various elements and materials in addition to the fertilizing sperm. The roles of these components are unknown. One hypothesis is that they are nutritional gifts to the female as a paternal investment. We made game theoretical models from the point of view of sperm competition among males and examined this hypothesis. The evolutionary stable strategy (ESS) of the models showed that (1) when multiple mating in the female is relatively low, gifts in seminal flow or other types of gift may evolve, at least, a male does not resist a female digesting his sperm; and (2) the ratio of nutritional gift rapidly decreases to zero with the probability or frequency of multiple mating in the female. Hence, we concluded that nutritional gifts in seminal flow can exist only in species in which sperm competition among males is rare. Furthermore, we concluded that if an element or material eminently decreases when sperm competition becomes intense, it may be a gift as a paternal investment; if not, other hypotheses concerned with more agonistic roles are more feasible.

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Effects of gamma irradiation on the mechanisms of sperm transfer in Trichoplusia ni

Cited by 55 publications

References 8 publications

Ultrastructure and heteromorphism of spermatozoa in five species of bugs (Pentatomidae: Heteroptera)

Ultrastructure and heteromorphism of spermatozoa in five species of bugs (Pentatomidae: Heteroptera)

Interactions between body size and mating history influence the reproductive success of males of a tortricid moth, Zeiraphera canadensis

Can voluntary nutritional gifts in seminal flow evolve?

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