Investment in Testes and the Cost of Making Long Sperm in Drosophila

@article{Pitnick1996InvestmentIT,
  title={Investment in Testes and the Cost of Making Long Sperm in Drosophila},
  author={Scott Pitnick},
  journal={The American Naturalist},
  year={1996},
  volume={148},
  pages={57 - 80}
}
  • S. Pitnick
  • Published 1 July 1996
  • Biology
  • The American Naturalist
Relationships among body mass, testis mass, sperm length, and the number of sperm produced were examined among 11 Drosophila species, after controlling for phylogenetic effects. This is the first study to examine many of these relationships comparatively in an invertebrate taxon; patterns observed among these variables were fundamentally different from those consistently reported in studies of vertebrates. In regression analyses, testis mass increased with body mass with an exponent greater… 
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IS THE PRODUCTION OF MULTIPLE SPERM TYPES ADAPTIVE?
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References

SHOWING 1-10 OF 106 REFERENCES
Large-male advantages associated with costs of sperm production in Drosophila hydei, a species with giant sperm.
  • S. PitnickT. Markow
  • Biology
    Proceedings of the National Academy of Sciences of the United States of America
  • 1994
TLDR
Smaller males of the fruit fly Drosophila hydei were found to make a greater relative investment in testicular tissue growth, even though they have shorter and thinner testes, and correlations should exist between male body size, rates of sperm production, and fitness attributes associated with the production of sperm.
Sperm Competition, Sperm Depletion, Paternal Care, and Relative Testis Size in Birds
TLDR
Variation in relative testis mass was positively related to variation in copulation frequency per female, and the variation was significant; the sperm competition hypothesis was supported by data and the sperm depletion hypothesis could not account for variation in testis size.
Associations between body size, mating pattern, testis size and sperm lengths across butterflies
  • M. Gage
  • Environmental Science
    Proceedings of the Royal Society of London. Series B: Biological Sciences
  • 1994
TLDR
The results suggest that sperm competition in butterflies selects for increased investment in spermatogenesis, and specifically longer fertilizing sperm, which are not selected to be minimally sized to maximize numbers for a purely raffle-based sperm competition mode.
Delayed male maturity is a cost of producing large sperm in Drosophila.
TLDR
Results suggest that delayed male maturity is a cost of producing long sperm, and a possible physiological mechanism to explain the observed relationship is discussed.
Sperm size and sperm competition in birds
TLDR
It is concluded that sperm competition influences sperm size in birds and detailed study of this interaction will provide a new dimension to the study of avian mating systems.
Coevolution between male ejaculates and female reproductive biology in eutherian mammals
  • M. GomendioE. Roldan
  • Biology
    Proceedings of the Royal Society of London. Series B: Biological Sciences
  • 1993
TLDR
It is argued that differences in female reproductive biology may also have influenced the evolution of sperm numbers as well as several other sperm traits, suggesting that variation in sperm fertile lifespan may be related to differences in sperm size.
Testis weight, body weight and breeding system in primates
TLDR
The hypothesis that selection will favour the male that can deposit the largest number of sperm means that the volume of spermatogenic tissue and hence testis size is far greater in the chimpanzee than in the gorilla or orangutan, and the results support the hypothesis.
Sperm competition influences sperm size in mammals
  • M. GomendioE. Roldan
  • Biology
    Proceedings of the Royal Society of London. Series B: Biological Sciences
  • 1991
TLDR
The view that longer sperm may be adaptive in the context of sperm competition is supported, as it is found that sperm length is positively correlated with maximum sperm velocity.
Size and Function of Mammalian Testes in Relation to Body Size
TLDR
Among mammals in general, there is no correlation between size of the testes and their location (abdominal or scrotal) in the body, or between size and body form and mode of locomotion (terrestrial, aquatic, aerial).
...
...