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Resolving Mechanisms of Competitive Fertilization Success in Drosophila melanogaster
Sperm showed more mobility within the female storage organs than expected, with those from the most recent copulation displacing sperm from previous males; however, sperm viability remained consistent over long-term storage and each male's sperm was equally competitive in fertilizing the female's eggs. Expand
Sperm morphological diversity
Publisher Summary This chapter reviews the current knowledge of variation in sperm morphology over several levels of biological organization: variation within males (both within and acrossExpand
Delayed male maturity is a cost of producing large sperm in Drosophila.
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. Expand
The macroevolutionary pattern of organ dysfunction and morphological divergence suggests that ancestrally both kinds of organs stored sperm, and data indicate that the seminal receptacle is the primary sperm‐storage organ in Drosophila. Expand
Sperm-Female Coevolution in Drosophila
Using populations of Drosophila melanogaster selected for divergent sperm length or female sperm-storage organ length, experimentally show that male fertilization success is determined by an interaction between sperm and female morphology. Expand
Investment in Testes and the Cost of Making Long Sperm in Drosophila
  • S. Pitnick
  • Biology
  • The American Naturalist
  • 1 July 1996
Results are discussed in terms of the costs of producing longer sperm, the correlated evolution of sperm length and body size, the relationship between breeding system and sperm production patterns, and the nature of differences between vertebrates and invertebrates in sperm production and the size of testes. Expand
Male Gametic Strategies: Sperm Size, Testes Size, and the Allocation of Ejaculate Among Successive Mates by the Sperm-Limited Fly Drosophila pachea and Its Relatives
Hypotheses to explain the maintenance of male ejaculate delivery patterns that are consistent with sperm competition and bet-hedging theory are examined, as are potential selection pressures responsible for sperm-size evolution. Expand
Males' evolutionary responses to experimental removal of sexual selection
Sexual selection Favours the production of increased numbers of sperm in D. melanogaster and that sexual selection favours some male traits conferring a direct cost to the fecundity of females. Expand
Mating system and brain size in bats
Comparisons of bats show that multiple mating by males, in the absence ofmultiple mating by females, has no evolutionary impact on relative brain dimension, and bat species with promiscuous females have relatively smaller brains than do species with females exhibiting mate fidelity. Expand
Proximate Causes of Rensch’s Rule: Does Sexual Size Dimorphism in Arthropods Result from Sex Differences in Development Time?
This study found only a weak positive relationship between SSD and SBM overall, suggesting that growth rate differences between the sexes are more important than development time differences in proximately mediating SSD in a wide but by no means comprehensive range of arthropod taxa. Expand