Temporal Variability in Sexual Selection Acting on Reproductive Tactics and Body Size in Male Snakes

@article{Madsen1993TemporalVI,
  title={Temporal Variability in Sexual Selection Acting on Reproductive Tactics and Body Size in Male Snakes},
  author={Thomas Madsen and Richard Shine},
  journal={The American Naturalist},
  year={1993},
  volume={141},
  pages={167 - 171}
}
  • T. Madsen, R. Shine
  • Published 1 January 1993
  • Environmental Science
  • The American Naturalist
Although the selective forces responsible for the evolution of mating systems and sexual size dimorphism have been the subjects of intensive research, most studies rely on data from only one or a few years (e.g., Clutton-Brock 1988). Temporal variation in the importance of alternative reproductive tactics, or in consequent selective pressures on behavior or morphology, has not been documented from long-term studies. Nonetheless, the magnitude of such variation and the factors responsible for it… 
COSTS OF REPRODUCTION INFLUENCE THE EVOLUTION OF SEXUAL SIZE DIMORPHISM IN SNAKES
  • T. Madsen, R. Shine
  • Environmental Science, Biology
    Evolution; international journal of organic evolution
  • 1994
TLDR
Detailed demographic and ecological data are used on one of these atypical species (the adder Vipera berus) to test among potential explanations for female-larger dimorphism in a species with male-male combat, and suggest that sex differences in costs of reproduction may strongly influence optimal body sizes in each sex, and hence may affect the direction of sexual sizeDimorphism.
IN HOT PURSUIT: FLUCTUATING MATING SYSTEM AND SEXUAL SELECTION IN SAND LIZARDS
TLDR
Year-to-year variation in sexual selection on body size and postcopulatory sperm competition and cryptic female choice in free‐ranging sand lizards exposed to an increasing mean mating season temperature may contribute to highly dynamic and shifting selection mosaics in the wild.
Reproductive versus ecological advantages to larger body size in female snakes, Vipera aspis
TLDR
The results suggest that variation in female body size among and within species (and hence, in the degree of sexual dimorphism) may be driven by the ecological as well as reproductive consequences of body size variation in both sexes.
Variation in body size, sexual dimorphism and age-specific survival in stoats,Mustela erminea(Mammalia: Carnivora), with fluctuating food supplies☆
TLDR
An auxiliary hypothesis is examined which predicts that the degree of sexual dimorphism may also vary over the short-term, because when food is temporarily abundant, sexual selection should favour a greater growth rate of males than of females.
No evidence of male-biased sexual selection in a snake with conventional Darwinian sex roles
Decades of research on sexual selection have demonstrated that ‘conventional’ Darwinian sex roles are common in species with anisogamous gametes, with those species often exhibiting male-biased
MEASURES OF NATURAL AND SEXUAL SELECTION
TLDR
It is found that without competition, natural selection acts only on female body size for increased egg production; there is no detectable selection on males for the phenotypic distribution the authors used.
Male reproductive success and sexual selection in northern water snakes determined by microsatellite DNA analysis
TLDR
It is proposed that males are smaller than females because the lack of advantage to large size allows males to adopt a low-energy, low-growth strategy that reduces their risk of predation outside the mating season.
Bateman–Trivers in the 21st Century: sexual selection in a North American pitviper
TLDR
It is argued that molecular approaches to quantifying reproductive success and strength of sexual selection provide more accurate results than do behavioural observations alone.
Sexual size dimorphism in snakes revisited
  • R. Shine
  • Biology, Environmental Science
  • 1994
TLDR
Analysis of published and original data on the degree of sexual size dimorphism in snakes suggests that a previously documented correlation between SSD and geographic distribution is due to phylogenetic conservatism rather than to any functional relationship between the two variables.
...
...

References

SHOWING 1-10 OF 15 REFERENCES
Sexual Dimorphism in Bullfrogs
TLDR
It is suggested that an observed body size dimorphism in any species in which individuals grow appreciably as adults could result from a difference in the age distributions of males and females as well as from differential growth rates.
ON THE MEASUREMENT OF NATURAL AND SEXUAL SELECTION: THEORY
TLDR
An approach to the empirical measurement of selection that is directly related to formal evolutionary theory is illustrated and a mode of data analysis that describes selection in useful, theoretical terms is presented so that field or experimental results will have a tangible relationship to equations for evolutionary change.
The theory of sex allocation.
  • E. Charnov
  • Biology
    Monographs in population biology
  • 1982
This book is the first comprehensive treatment of sex allocation from the standpoint of modern evolutionary theory. It shows how the determination of sex ratio, resource allocation to sperm versus
THE MEASUREMENT OF SELECTION ON CORRELATED CHARACTERS
TLDR
Measures of directional and stabilizing selection on each of a set of phenotypically correlated characters are derived, retrospective, based on observed changes in the multivariate distribution of characters within a generation, not on the evolutionary response to selection.
Why do female adders copulate so frequently?
TLDR
These field studies on Swedish adders provide the first empirical evidence that multiple copulations, with different partners each time, increase offspring viability.
Ovarian cycle and reproductive dynamics in the female adder, Vipera berus (Reptilia, Viperidae)
TLDR
Feeding periods, fat mobilization, reproductive effort, endocrine ectivity and adaptive value of the biennial reproduction are discussed and the adaptation to short season habitats is stressed.
Multiple paternity in the adder, Vipera berus
TLDR
Female adders were mated under laboratory conditions with males carrying different, electrophoretically detectable markers, showing that sperm from previous year(s) can be used and females mated twice do produce bipaternal broods.
Courtship, mating and agonistic behaviour in a free-living population of adders, Vipera berus (L.)
Courtship, mating and agonistic behaviour in free living adders, Vipera berus, are described. Temporal associations between behaviour patterns within and between individuals are analyzed to test
...
...