Mating system and mating success of the desert spider Agelenopsis aperta

1995 ◽  
Vol 36 (5) ◽  
pp. 313-322 ◽  
Author(s):  
Fred Singer ◽  
Susan E. Riechert
Keyword(s):  
Mating System ◽  
Mating Success ◽  
Agelenopsis Aperta

EVIDENCE OF A MALE SEX PHEROMONE IN THE EUROPEAN CORN BORER, OSTRINIA NUBILALIS (HÜBNER) (LEPIDOPTERA: PYRALIDAE)

1992 ◽  
Vol 124 (1) ◽  
pp. 113-116 ◽  
Author(s):  
Lucie Royer ◽  
Jeremy N. McNeil
Keyword(s):  
Sex Pheromone ◽  
Mating System ◽  
Mating Success ◽  
Ostrinia Nubilalis ◽  
European Corn Borer ◽  
Male Pheromone ◽  
Corn Borer ◽  
Male Sex Pheromone ◽  
Lepidoptera Pyralidae ◽  
Male Sex

AbstractEuropean corn borer males have hair pencils located ventrally on the 8th sternite and these are extruded when a male approaches a calling female. The fact that (i) antennectomized females mated significantly less than both intact controls and individuals subjected to other forms of surgery, and (ii) males with hair pencils removed had a significantly lower mating success than control males, suggests that a male pheromone is involved in the mating system of the European corn borer.

scholarly journals Sexually selected females in the monogamous Western Australian seahorse

2006 ◽  
Vol 274 (1609) ◽  
pp. 521-525 ◽  
Author(s):  
Charlotta Kvarnemo ◽  
Glenn I Moore ◽  
Adam G Jones
Keyword(s):  
Sexual Selection ◽  
Sex Ratio ◽  
Mating System ◽  
Genetic Study ◽  
Mating Success ◽  
Male Preference ◽  
Monogamous Species ◽  
Adult Sex Ratio ◽  
Western Australian ◽  
Selection Differentials

Studies of sexual selection in monogamous species have hitherto focused on sexual selection among males. Here, we provide empirical documentation that sexual selection can also act strongly on females in a natural population with a monogamous mating system. In our field-based genetic study of the monogamous Western Australian seahorse, Hippocampus subelongatus , sexual selection differentials and gradients show that females are under stronger sexual selection than males: mated females are larger than unmated ones, whereas mated and unmated males do not differ in size. In addition, the opportunity for sexual selection (variance in mating success divided by its mean squared) for females is almost three times that for males. These results, which seem to be generated by a combination of a male preference for larger females and a female-biased adult sex ratio, indicate that substantial sexual selection on females is a potentially important but under-appreciated evolutionary phenomenon in monogamous species.

scholarly journals No evidence that male sexual experience increases mating success in a coercive mating system

2019 ◽  
Vol 150 ◽  
pp. 201-208 ◽  
Author(s):  
Maider Iglesias-Carrasco ◽  
Rebecca J. Fox ◽  
Alan Vincent ◽  
Megan L. Head ◽  
Michael D. Jennions
Keyword(s):  
Mating System ◽  
Mating Success ◽  
Sexual Experience ◽  
Coercive Mating

scholarly journals Evolution of sex ratio through gene loss

2019 ◽  
Vol 116 (26) ◽  
pp. 12919-12924 ◽  
Author(s):  
Da Yin ◽  
Eric S. Haag
Keyword(s):  
Sex Ratio ◽  
Population Growth ◽  
Mating System ◽  
Mating Success ◽  
Population Subdivision ◽  
Male Mating ◽  
Mixed Mating ◽  
Male Mating Success ◽  
Caenorhabditis Briggsae ◽  
Male Frequency

The maintenance of males at intermediate frequencies is an important evolutionary problem. Several species ofCaenorhabditisnematodes have evolved a mating system in which selfing hermaphrodites and males coexist. While selfing produces XX hermaphrodites, cross-fertilization produces 50% XO male progeny. Thus, male mating success dictates the sex ratio. Here, we focus on the contribution of themale secreted short(mss) gene family to male mating success, sex ratio, and population growth. Themssfamily is essential for sperm competitiveness in gonochoristic species, but has been lost in parallel in androdioecious species. Using a transgene to restoremssfunction to the androdioeciousCaenorhabditis briggsae,we examined how mating system and population subdivision influence the fitness of themss+genotype. Consistent with theoretical expectations, whenmss+andmss-null (i.e., wild type) genotypes compete,mss+is positively selected in both mixed-mating and strictly outcrossing situations, though more strongly in the latter. Thus, while sexual mode alone affects the fitness ofmss+, it is insufficient to explain its parallel loss. However, in genetically homogenous androdioecious populations,mss+both increases male frequency and depresses population growth. We propose that the lack of inbreeding depression and the strong subdivision that characterize naturalCaenorhabditispopulations impose selection on sex ratio that makes loss ofmssadaptive after self-fertility evolves.

Some Determinants of the Mating System in a Population of Painted Reed Frogs (Hyperolius Marmoratus)

Behaviour ◽  
1988 ◽  
Vol 106 (3-4) ◽  
pp. 265-278 ◽  
Author(s):  
Steven R. Telford ◽  
Miranda L. Dyson
Keyword(s):  
Mating System ◽  
Mating Success ◽  
Breeding Site ◽  
Mating Strategies ◽  
Operational Sex Ratio ◽  
Advertisement Call ◽  
Male Mating ◽  
Male Mating Success ◽  
Male Population ◽  
Sonic Environment

AbstractHyperolius marmoratus shares its breeding site with 12 synchronously breeding species. Males call from elevated perches to attract females. Observations of captive populations suggest that males may adopt alternative mating strategies when chorus densities are high. Similar strategies were not observed in natural choruses. The operational sex ratio (OSR) was always male-biased and also highly variable. Mating was polygynous, only 25% of the male population actually mated. Females mated either once or twice. Variance in mating success was much greater among males, an obvious consequence of a skewed OSR. Female choice was probably not a causal factor because male mating success was correlated with neither size nor age. Size-based variation in the male advertisement call does exist, but females cannot exploit this potential vocal cue because of their impaired discriminatory ability in a complex sonic environment and the potential risk of mismating. Although the mating system may best be described as lek-like, with males forming organised choruses through competitive interactions, the variance in male mating success is probably a consequence of stochastic factors.

scholarly journals Mate choice confers direct benefits to females ofAnastrepha fraterculus(Diptera: Tephritidae)

2019 ◽  
Author(s):  
Guillermo E. Bachmann ◽  
Francisco Devescovi ◽  
Ana L. Nussenbaum ◽  
Fabián H. Milla ◽  
Todd E. Shelly ◽  
...  
Keyword(s):  
Mate Choice ◽  
Mating System ◽  
Female Choice ◽  
Mating Success ◽  
Female Preference ◽  
Male Mating ◽  
Male Mating Success ◽  
Lek Mating ◽  
Direct Benefits ◽  
Tephritid Fruit Flies

AbstractExposure to plant compounds and analogues of juvenile hormone (JH) increase male mating success in several species of tephritid fruit flies. Most of these species exhibit a lek mating system, characterized by active female choice. Although the pattern of enhanced male mating success is evident, few studies have investigated what benefits, if any, females gain via choice of exposed males in the lek mating system. In the South American fruit fly,Anastrepha fraterculus, females mate preferentially with males that were exposed to volatiles released by guava fruit or treated with methoprene (a JH analogue). Here, we tested the hypothesis that female choice confers direct fitness benefits in terms of fecundity and fertility. We first carried out mate choice experiments presenting females with males treated and non-treated with guava volatiles or, alternatively, treated and non-treated with methoprene. After we confirm female preference for treated males, we compared the fecundity and fertility between females mated with treated males and non-treated ones. We found thatA. fraterculusfemales that mated with males exposed to guava volatiles showed higher fecundity than females mated to non-exposed males. On the other hand, females that mated methoprene-treated males showed no evidence of direct benefits. Our findings represent the first evidence of a direct benefit associated to female preference for males that were exposed to host fruit odors in tephritid fruit flies. Differences between the two treatments are discussed in evolutionary and pest management terms.

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