scholarly journals Mating system and sex ratios of a pollinating fig wasp with dispersing males

2002 ◽  
Vol 269 (1507) ◽  
pp. 2317-2323 ◽  
Author(s):  
Jaco M. Greeff
Keyword(s):  
Mating System ◽  
Sex Ratios ◽  
Fig Wasp

What Fig Wasp Sex Ratios May or May Not Tell Us about Sex Allocation Strategies

Oikos ◽  
1999 ◽  
Vol 87 (3) ◽  
pp. 520 ◽  
Author(s):  
Prarthana Kathuria ◽  
Jaco M. Greeff ◽  
Steve G. Compton ◽  
K. N. Ganeshaiah
Keyword(s):  
Sex Allocation ◽  
Sex Ratios ◽  
Fig Wasp ◽  
Allocation Strategies

scholarly journals STABILIZING SELECTION AND VARIANCE IN FIG WASP SEX RATIOS

Evolution ◽  
1998 ◽  
Vol 52 (2) ◽  
pp. 475-485 ◽  
Author(s):  
S. A. West ◽  
E. A. Herre
Keyword(s):  
Sex Ratios ◽  
Stabilizing Selection ◽  
Fig Wasp

Biased sex ratios and parasite mating probabilities

Parasitology ◽  
1993 ◽  
Vol 107 (3) ◽  
pp. 287-295 ◽  
Author(s):  
R. M. May ◽  
M. E. J. Woolhouse
Keyword(s):  
Population Dynamics ◽  
Sex Ratio ◽  
Mating System ◽  
Sex Ratios ◽  
Theoretical Framework ◽  
Main Body ◽  
Female Mating ◽  
The Mean ◽  
Mated Female

SummaryAn earlier paper (May, 1977) developed a theoretical framework for exploring the consequences of dioecy for the population dynamics of schistosomes, assuming an unbiased sex ratio. This paper extends the analysis to biased sex ratios, as have been reported in practice. We consider the relationships of the mean number and distribution of worms among hosts, the sex ratio, and the mating system (monogamous or polygamous) to: (i) the female mating probability, Φ the prevalence of mated female worms. Ω: and (iii) the mean number of mated female worms per host, ξ. Among other results, we show how high values of Φ are associated with male-biased sex ratios and polygamous mating; that Ω is independent of the mating system and is relatively unaffected by the sex ratio; and that ξ is maximal for unbiased sex ratios given monogamous mating, and for female-biased sex ratios if mating is polygamous. These results, together with the confounding effects of the mean number and distribution of worms, are described in detail in the main body of the paper.

Stabilizing Selection and Variance in Fig Wasp Sex Ratios

Evolution ◽  
1998 ◽  
Vol 52 (2) ◽  
pp. 475 ◽  
Author(s):  
S. A. West ◽  
E. A. Herre
Keyword(s):  
Sex Ratios ◽  
Stabilizing Selection ◽  
Fig Wasp

scholarly journals Outbreeding and possibly inbreeding depression in a pollinating fig wasp with a mixed mating system

Heredity ◽  
2009 ◽  
Vol 102 (4) ◽  
pp. 349-356 ◽  
Author(s):  
J M Greeff ◽  
G J Jansen van Vuuren ◽  
P Kryger ◽  
J C Moore
Keyword(s):  
Mating System ◽  
Inbreeding Depression ◽  
Mixed Mating ◽  
Fig Wasp ◽  
Mixed Mating System

scholarly journals Harvesting of males delays female breeding in a socially monogamous mammal; the beaver

2006 ◽  
Vol 3 (1) ◽  
pp. 107-109 ◽  
Author(s):  
Howard Parker ◽  
Frank Rosell ◽  
Atle Mysterud
Keyword(s):  
Mating System ◽  
Reproductive Cycle ◽  
Negative Impact ◽  
Sex Ratios ◽  
Castor Fiber ◽  
Adult Males ◽  
Timing Of Reproduction ◽  
Pregnant Females ◽  
Socially Monogamous

Human exploitation may skew adult sex ratios in vertebrate populations to the extent that males become limiting for normal reproduction. In polygynous ungulates, females delay breeding in heavily harvested populations, but effects are often fairly small. We would expect a stronger effect of male harvesting in species with a monogamous mating system, but no such study has been performed. We analysed the effect of harvesting males on the timing of reproduction in the obligate monogamous beaver ( Castor fiber ). We found a negative impact of harvesting of adult males on the timing of parturition in female beavers. The proportion of normal breeders sank from over 80%, when no males had been shot in the territories of pregnant females, to under 20%, when three males had been shot. Harvesting of males in monogamous mammals can apparently affect their normal reproductive cycle.

scholarly journals The extraordinary mating system of Zeus bugs (Heteroptera:Veliidae:Phoreticovelia sp.)

2007 ◽  
Vol 55 (2) ◽  
pp. 131 ◽  
Author(s):  
Göran Arnqvist ◽  
Therésa M. Jones ◽  
Mark A. Elgar
Keyword(s):  
Mating System ◽  
Sex Role ◽  
Mating Behaviour ◽  
Sex Ratios ◽  
Mating Strategies ◽  
Evolutionary Divergence ◽  
Unique Form ◽  
Mating System Evolution ◽  
In The Wild ◽  
Sexually Antagonistic Coevolution

Wingless female Zeus bugs (genus: Phoreticovelia) produce a secretion from dorsal glands that males feed upon when riding on females. This unique form of sex-role-reversed nuptial feeding may have set the stage for an unusual mating system. Here, we provide natural history details of the mating behaviour for two Zeus bug species. While these species have many mating behaviours in common, the wing morphs within species exhibit entirely different mating strategies. Adult wingless females are ridden permanently by adult wingless males. In the wild, adult sex-ratios among the wingless morph are male-biased; few unmounted adult females exist and many males instead ride immature females who also produce glandular secretions. In contrast, sex-ratios among the winged morph is not male-biased, sexual size dimorphism is less pronounced, females have no dorsal glands and are, consequently, not ridden by males. Field and laboratory observations show that mating is strongly assortative by wing morph. This assortment may allow evolutionary divergence between the two morphs. We discuss the implications of this mating system and suggest that it adds to those studies showing that sexually antagonistic coevolution can be a driver of mating system evolution.

Generation of sex ratio biases in the red-tailed phascogale (Phascogale calura)

2008 ◽  
Vol 20 (2) ◽  
pp. 275 ◽  
Author(s):  
W. K. Foster ◽  
D. A. Taggart
Keyword(s):  
Sex Ratio ◽  
Mating System ◽  
Meta Analysis ◽  
Sex Ratios ◽  
Corpora Lutea ◽  
Sex Ratio At Birth ◽  
Maternal Weight ◽  
Female Age ◽  
Male Bias ◽  
Sex Biases

Male semelparous dasyurid species are annual breeders that use a promiscuous mating system. These species have shown biases in litter sex ratios and, with females producing more young than they have available teats, this provides an opportunity for the manipulation of the sex ratio at birth. The sex ratio of embryos and pouch young, and the degree of embryonic overproduction, in red-tailed phascogales (Phascogale calura) was investigated to gain an understanding of the mechanism by which sex biases may be generated. The sex ratio of embryos did not differ from parity, but a male bias was observed in young attaching to teats. Females produced an average of 15.1 ± 1.9 corpora lutea and 10.5 ± 3.5 viable embryos, with no difference in fecundity observed with female age or weight. Because females only have eight teats, the overproduction of young, and male-biased attachment, was sufficient to explain the observed male bias in pouch young. No relationship was observed between maternal weight and sex ratio, but heavier females did tend to produce more ova. Meta-analysis of studies providing information on litter sex ratios in male semelparous dasyurid species did not show any consistent trend.

Optimality, plasticity and selective regime in fig wasp sex ratios

Nature ◽  
1987 ◽  
Vol 329 (6140) ◽  
pp. 627-629 ◽  
Author(s):  
Edward Allen Herre
Keyword(s):  
Sex Ratios ◽  
Fig Wasp ◽  
Selective Regime
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