Male Remating
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Chemical ecology and reproduction of Neoleucinodes elegantalis Guenée (Lepidoptera : Crambidae) / Ecologia química e reprodução de Neoleucinodes elegantalis Guenée (Lepidoptera : Crambidae)
The reproduction in insects is affected by a wide array of factors that acts directly on the reproductive output, related with offspring quality and quantity: the interaction, by physical, chemical and visual cues, between insects and host plants; the larval growth rate affecting adult size and mating rate, as a mechanism of reproductive sucess. Thus, studie
Publicado em: 2010
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2. Influência da recópula de fêmeas selvagens de Ceratitis capitata (Wied., 1824) (Diptera: Tephritidae) na eficiência da técnica do inseto estéril / Influence of wild Ceratitis capitata (Wied., 1824) (Diptera: Tephritidae) females remating on the efficiency of the sterile insect technique
The sterile insect technique (SIT) aim at the induction of sterility in wild females by mating with sterile males released in great amounts in the field. These released males must compete with wild ones being able to attract and mate wild females, fertilize their eggs and avoid remating with a wild male that would lead to fertile eggs and consequently reduce
Publicado em: 2009
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3. Evolution of female remating behaviour following experimental removal of sexual selection.
The relatively small number of ova produced by a female can be fertilized by a single ejaculate in most species. Why females of many species mate with multiple males is therefore enigmatic, especially given that costs associated with remating have been well documented. Recently, it has been argued that females may remate at a maladaptive rate as an outcome o
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4. Genetic divergence of the seminal signal-receptor system in houseflies: the footprints of sexually antagonistic coevolution?
To understand fully the significance of cryptic female choice, we need to focus on each of those postmating processes in females which create variance in fitness among males. Earlier studies have focused almost exclusively on the proportion of a female's eggs fertilized by different males (sperm precedence). Yet, variance in male postmating reproductive succ
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5. Transient post-mating inhibition of behavioural and central nervous responses to sex pheromone in an insect.
Mating is costly for both male and female insects and should therefore only occur if it is likely to be successful. Within one scotophase, which is the dark period of the light cycle, male moths can only produce one single spermatophore, which is transferred to the female during mating. Remating within the same scotophase would thus be unsuccessful. We teste
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6. Studies of Esterase 6 in DROSOPHILA MELANOGASTER. VI. Ejaculate Competitive Abilities of Males Having Null or Active Alleles
Recent studies of the function of the polymorphic seminal fluid enzyme, esterase 6, of Drosophila melanogaster suggested that it may act in the process of sperm displacement (Gilbert, Richmond and Sheehan, 1981a). This report examines the competitive ability of ejaculates from males homozygous for null or active alleles of esterase 6 under three experimental
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7. Traumatic insemination and sexual conflict in the bed bug Cimex lectularius
The bed bug, Cimex lectularius, has a unique mode of copulation termed “traumatic” insemination [Carayon, J. (1966) in Monograph of the Cimicidae, ed. Usinger, R. (Entomol. Soc. Am., Philadelphia), pp. 81–167] during which the male pierces the female's abdominal wall with his external genitalia and inseminates into her body cavity [Carayon, J. (19
The National Academy of Sciences.
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8. A nonspecific fatty acid within the bumblebee mating plug prevents females from remating
The best mating strategy for males differs from that of females, because females gain from mating with several males (polyandry), but males gain from monopolizing the females. As a consequence, males have evolved a variety of methods, such as the transfer of inhibitory substances from their accessory glands, to ensure exclusive paternity of the female's
The National Academy of Sciences.
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9. Correlated effects of sperm competition and postmating female mortality
Adaptations in one sex may impair fitness in the opposite sex. Experiments with Drosophila melanogaster have shown that seminal fluid from the male accessory gland triggers a series of postmating responses in the female, including increased egg laying rate and lower remating propensity, but that accessory gland proteins also increase female death rate.
The National Academy of Sciences.
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10. Sexually antagonistic coevolution of a postmating-prezygotic reproductive character in desert Drosophila
Rapid divergence in postmating-prezygotic characters suggests that selection may be responsible for generating reproductive barriers between closely related species. Theoretical models indicate that this rapid divergence could be generated by a series of male adaptations and female counteradaptations by means of sexual selection or conflict, but empirical te
The National Academy of Sciences.
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11. Patterns of sperm precedence and predictors of paternity in the Trinidadian guppy.
Despite its widespread occurrence in animals, sperm competition has been studied in a limited range of taxa. Among the most neglected groups in this respect are internally fertilizing fish in which virtually nothing is known about the dynamics of sperm competition. In this study, we examined the outcome of sperm competition when virgin female guppies mated w
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12. Esterase 6 in Drosophila melanogaster: reproductive function of active and null males at low temperature.
Esterase 6 is a polymorphic carboxylesterase (carboxylic-ester hydrolase, EC 3.1.1.1) localized to the reproductive tract of male Drosophila melanogaster and transferred to females at copulation. The reproductive fitness of males is strongly affected by temperature and the esterase 6 alleles (active versus null) that they carry. Low temperature (18 degrees C