Many authors have reported that, under elevated risk of predation, male guppies (Poecilia reticulata) alter their behavior from courtship to forced copulation (gonopodial thrusts not preceded by sigmoid displays). This shift is presumed to benefit the brightly colored male, whose intense courting activity might otherwise increase his risk of detection and attack by predators. However, there is ...

In a previous study (1) during the investigation of the mutually reinforced instrumental sexual rqponses in rats a positive correlation has been found between the male and female response latencies. The purpose of the present work was to investigate whether this correlation is related to the mating behavior. Mutually reinforced instrumental responses, rewarded by contact with an animal of the o...

Eighty crossbred, virgin, yearling beef bulls were subjected to three serving capacity (SC) tests. Ten low SC (LSC) and 10 high SC (HSC) bulls similar in weight (avg wt = 452 kg), testicular size and seminal traits but differing in average services were selected. Objectives were to evaluate the mating behavior and fertility of LSC and HSC bulls at pasture when exposed to an average and a heavy ...

The mating system of eastern mosquito fish (Gambusia holbrooki) is dominated by male sexual coercion, where all matings are forced and females never appear to cooperate and actively avoid all attempts. Previous research has shown that male G. holbrooki offer a model system for examining the benefits of reversible thermal acclimation for reproductive success, but examining the benefits to female...

Theories suggest that, in cooperatively breeding species, female control over paternity and reproductive output may affect male reproductive skew and group stability. Female paternity control may come about through cryptic female choice or female reproductive behaviour, but experimental studies are scarce. Here, we show a new form of female paternity control in a cooperatively polyandrous cichl...

Mating induces pronounced changes in female reproductive behavior, typically including a dramatic reduction in sexual receptivity. In Drosophila, postmating behavioral changes are triggered by sex peptide (SP), a male seminal fluid peptide that acts via a receptor (SPR) expressed in sensory neurons (SPSNs) of the female reproductive tract. Here, we identify second-order neurons that mediate the...

Evaluation of the pattern of smoking prevalence over time could provide insight for disease prevention and tobacco control policy. Examination of assortative mating is important in assessing the relative contribution of genetic and environmental influences in behavior genetics. A significant spousal concordance for smoking could imply assortative mating behavior and have potential influence on ...

Drawing on life-history theory, it is predicted that individuals’ attitudinal orientation toward unrestricted short-term mating behavior, as well as their ability to engage in such behavior, are inversely related to nurturant emotional responses (tenderness) to infants. To test these hypotheses, participants (N = 305) completed measures assessing individual differences in short-term mating orie...

Females of Cylindrocorpus longistoma and C. curzii excrete attractants which probably function to bring the sexes together before mating. Intraspecific and interspecific heterosexual and homosexual pairing experiments showed the attractants to be species specific as well as sex specific. Observations on mating behavior support the hypothesis that sexual attraction and copulation require indepen...

For the first time the entire sequence of the mating behaviour of Antarctic krill (Euphausia superba) in the wild is captured on underwater video. This footage also provides evidence that mating can take place near the seafloor at depths of 400– 700 m. This observation challenges the generally accepted concept of the pelagic lifestyle of krill. The mating behaviour observed most closely resembl...