Male turtle sperm storage

To date, only a handful of surveys have examined genetic paternity in turtle broods from nature, but virtually every study has documented multiple paternity, typically in a high percentage of clutches Table 1. Related articles in Web of Science Google Scholar. Several novel perspectives on genetic mating systems have come from recent molecular studies on turtles. However, evidence for male mate searching and spermatogenesis in the fall Gibbons suggests that mating activity can occur in that season also, and that over-winter sperm storage may be an important component of the reproductive cycle of some turtle species see also Thomas et al. These phenomena highlight the importance of a temporally extended perspective on patterns of individual reproductive success. However, in this species, as well as in Trachemys scripta, the epididymis contains sperm throughout the entire year. A female who mated with a high-quality male, for example, might choose not to remate the following year, but instead to use that male's sperm to fertilize additional eggs in a second nesting season.
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Female sperm storage in reptiles | Request PDF

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Female sperm storage in reptiles

Moreover, AR expression in different regions of the oviduct revealed similar immunostaining in the vagina Fig. In the present study, almost all AR immunostaining was observed in the cilia of ciliated cells. As a result of clutches with greater variation in paternal genes and increased sperm competition, females can maximize both the genetic quality and number of offspring. Seasonal changes in serum gonadal steroids associated with migration, mating, and nesting in the loggerhead sea turtle Caretta caretta. In most cases, a high proportion of the clutches examined showed evidence of multiple paternity.
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Reproductive Biology of Turtles

Receive exclusive offers and updates from Oxford Academic. The pooled blood serum of P. For example, new light has been shed on the evolution of long-term sperm storage and utilization in nature, female motives for multiple paternity in the absence of strong pair bonds or social interactions, and the genetic consequences of a long reproductive life. After washing, the membrane was incubated with peroxidase-linked goat anti-rabbit IgG 1:
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This prediction was borne out by recent genetic data in painted turtles showing that for each of two females with appropriate clutches, stored sperm had fertilized a portion of the second clutch, whereas the first clutch was fertilized entirely by newly acquired sperm Pearse et al. Motility could be augmented by the addition of isobutyl methyl xanthine IBMX, 0. Here are the instructions how to enable JavaScript in your web browser. Thus, the beneWt of thermoregulation in terms of spermatogenesis may be higher than the potential cost in terms of lost mating opportunities. Add to My Bibliography. Although turtles typically do not display pair bonds or family group affiliations, social organizations exist in some species. National Oceanic and Atmospheric Administration; —
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