Optimal copula duration in yellow dung flies: effects of female size and egg content

@article{Parker1999OptimalCD,
  title={Optimal copula duration in yellow dung flies: effects of female size and egg content},
  author={G. Parker and L. Simmons and P. Stockley and Doreen M. McCHRISTIE and E. Charnov},
  journal={Animal Behaviour},
  year={1999},
  volume={57},
  pages={795-805}
}
We examine data on copula duration in dung flies, Scatophaga stercoraria, in relation to female phenotype. We use a marginal value theorem approach based on the plausible mechanisms of sperm competition to predict the effect of female variation on optimal copula duration, t *, from the male perspective. Future fertilizations are expected to have a trivial effect on t * with fully gravid females, but an increasing relative effect on t * towards completion of oviposition. t * is expected to be… Expand
OPTIMAL COPULA DURATION IN YELLOW DUNG FLIES: EJACULATORY DUCT DIMENSIONS AND SIZE-DEPENDENT SPERM DISPLACEMENT
  • G. Parker, L. Simmons
  • Biology, Medicine
  • Evolution; international journal of organic evolution
  • 2000
TLDR
Both results can be explained by size-dependent changes in the ejaculatory apparatus of the male with the female's exchange rate of sperm remaining constant with respect to male size, although the possibility that this female process may accelerate with increased male size is discussed. Expand
Size-dependent ejaculation strategies and reproductive success in the yellow dung fly, Scathophaga stercoraria
TLDR
It is confirmed that copulations on dung sire approximately three times as many offspring as those on foraging substrate, and large males reduced copula duration on fruit, as predicted, since this strategy enables greater investment into high-payoff matings ondung. Expand
Strategic ejaculation in the common dung fly Sepsis cynipsea
TLDR
It is concluded that copulation duration and ejaculate transfer vary in accordance with sperm competition theory, which indicates that males transfer more ejaculate with longer copulations. Expand
Copulation duration in the soldier fly: the roles of cryptic male choice and sperm competition risk
TLDR
Copulations were longer when male density was high, which support the hypothesis that males increase copulation duration when there is a high risk of sperm competition and also supports the hypothesis of cryptic male choice. Expand
OPTIMAL COPULA DURATION IN YELLOW DUNG FLIES: EJACULATORY DUCT DIMENSIONS AND SIZE‐DEPENDENT SPERM DISPLACEMENT
Abstract.— We aim to interpret sperm displacement in relation to male size in the yellow dung fly, Scatophaga stercoraria, and to compare the general properties of indirect and direct size‐dependentExpand
Relative influence of male and female genital morphology on paternity in the dung beetle Onthophagus taurus
TLDR
Whether female genital morphology influences the repeatability of P-sub-2 when the same pair of male dung beetles copulated with a series of full-sib females or unrelated females that were all unrelated to the male pair is evaluated. Expand
Male birch catkin bugs vary copula duration to invest more in matings with novel females
TLDR
The results imply that male birch catkin bugs in nature are frequently time-, sperm- or seminal fluid-limited, and that, as predicted by theory, they strategically allocate more of their mating effort and ejaculate reserves to novel females, a form of (cryptic) male mate choice. Expand
CRYPTIC FEMALE CHOICE IN THE YELLOW DUNG FLY SCATHOPHAGA STERCORARIA (L.)
Both female choice and male-male competition may take place during reproduction in many species. Female choice tends to be less obvious than male-male competition and consequently has received lessExpand
CRYPTIC FEMALE CHOICE IN THE YELLOW DUNG FLY SCATHOPHAGA STERCORARIA (L.)
TLDR
In this study, cryptic choice occurred in Scathophaga stercoraria and the pattern of choice was consistent with previously reported results, and the results suggest that only large females may benefit from increased spermathecae number by being able to act against male interests. Expand
Strategic Ejaculation in the Black Scavenger Fly Sepsis cynipsea Revisited: Copula Duration as a Function of Sperm Depletion and Body Size
TLDR
Responses to female size indicate more strategic and sophisticated sperm-allocation strategies than previously thought, suggesting that males are investing more sperm in larger, more fecund females. Expand
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Using the model to assess the fertilization rate ( eggs/min) achieved by males with varying copula durations in the present population and theoretical populations where the duration is both greater and smaller than at present, it can be predicted that selection would favour a value close to that observed. Expand
INDIVIDUAL VARIATION IN SPERM COMPETITION SUCCESS OF YELLOW DUNG FLIES, SCATOPHAGA STERCORARIA
  • L. Simmons, G. Parker
  • Biology, Medicine
  • Evolution; international journal of organic evolution
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TLDR
Variation in the sperm competition success of individual male dung flies shows that “large” males have a greater rate of sperm displacement than “small’ males and the levels of prey availability during testis maturation may influence a male's success in sperm competition although his immediate mating history does not. Expand
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This evolutionarily stable strategy (ESS) version of the dung fly model allows an explicit solution for the predicted competitive optimum, and in a general sense, MVT optima will be close to their ESS equivalent when the cycle duration is long relative to the plausible patch exploitation times. Expand
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In this study, cryptic choice occurred in Scathophaga stercoraria and the pattern of choice was consistent with previously reported results, and the results suggest that only large females may benefit from increased spermathecae number by being able to act against male interests. Expand
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The present series of papers is aimed towards constructing a comprehensive model of sexual selection and its influence on reproductive strategy in the dung fly, Scatophaga stercoraria. The techniqueExpand
Sperm Displacement in the Yellow Dung Fly, Scatophaga stercoraria: An Investigation of Male and Female Processes
TLDR
A quantitative attempt to incorporate female processes into the analysis of sperm utilization patterns in insects by following the movement of the copulating male's ejaculate through the female's reproductive tract using males labeled with different radioisotopes. Expand
Evolution of phenotypic optima and copula duration in dungflies
TLDR
It is shown that the copula duration of male dungflies is tuned precisely and continuously to the size of the copulating male, representing one of the first quantitative demonstrations of optimal responses covarying with a continuous aspect of phenotype. Expand
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