Posted on: 02 March, 2017
Author: Alexander P
Cowley and Wise (1970) showed that the activity of 6-day old baby mice is reduced if they are kept in the presence of soiled sawdust or pheromones from a lactating female, whereas activity increases i... Cowley and Wise (1970) showed that the activity of 6-day old baby mice is reduced if they are kept in the presence of soiled sawdust or pheromones from a lactating female, whereas activity increases if they are kept in the presence of stock sawdust. The adaptive significance of this phenomenon is clearly to maintain cohesion in the nest during the preweaning period. Non-estrous females do...
Posted on: 02 March, 2017
Author: Alexander P
The emergent beetle is exposed to new environmental conditions such as sunlight, uctuating relative humidity, wind and heat. At this point in their life cycle, scolytids are characteristically ight ... The emergent beetle is exposed to new environmental conditions such as sunlight, uctuating relative humidity, wind and heat. At this point in their life cycle, scolytids are characteristically ight positive. Many of the physiological criteria governing emergence must also govern readiness to y. In addition, emergence periodicity is apparently reected in the diet ight rhythms of many scolytids (Daterman et al. 1965; Gara 1963; Vité et al. 1964). The environmental...
Posted on: 02 March, 2017
Author: Alexander P
Ability of rats of either sex to detect odors of sexually active members of the opposite sex is independent of their own gonadal state. Attraction to that odor, on the other hand, requires that female... Ability of rats of either sex to detect odors of sexually active members of the opposite sex is independent of their own gonadal state. Attraction to that odor, on the other hand, requires that females be either sexually experienced or under the inuence of estrogen. while positive responses by males require both androgen and sexual experience. Lydell and Doty (1972), also working with rats, conrmed...
Posted on: 02 March, 2017
Author: Alexander P
Exclusive mating cycles also appear to function in maintaining separation of two closely related lymantriids, the gypsy moth (Porthetria dispar) and the nun moth (Lymantria morzacha (L.)), both of wh... Exclusive mating cycles also appear to function in maintaining separation of two closely related lymantriids, the gypsy moth (Porthetria dispar) and the nun moth (Lymantria morzacha (L.)), both of which co-occur widely from Europe to Japan. The gypsy moth sex attractant pheromone is cis-7,8-epoxy-2-methyloctade- cane (Bierl et al. 1970) and the nun moth has recently been shown to be lured to this chemical (Schonherr 1972). In Europe the nun moth’s...
Posted on: 02 March, 2017
Author: Alexander P
However, a very large number of reports on the occurrence and histological structure of specialized, odor-producing skin glands and on behavioral patterns concerned with the emission, deposition and o... However, a very large number of reports on the occurrence and histological structure of specialized, odor-producing skin glands and on behavioral patterns concerned with the emission, deposition and olfactory investigation of excretions suggest that pheromones not only exist in many -- if not most — primate species, but that they are also of considerable importance in regulating the daily life of the individual according to http://hartch25.weebly.com/our-marketing-blog/some-claim-pheromones-doesnt-work I shall review the evidence...
Posted on: 02 March, 2017
Author: Alexander P
The wild rabbit is a gregarious species which forms social pheromones — colonies — occupying their own warren systems and grazing grounds. Colonies consist of sepa- rate groups each of whi... The wild rabbit is a gregarious species which forms social pheromones — colonies — occupying their own warren systems and grazing grounds. Colonies consist of sepa- rate groups each of which connes its activities to a group territory. Groups are made up of a few males and females among which a social hierarchy develops separately for each sex. The pheromone dominance hierarchy typical for the rabbit is indeed largely...
Posted on: 02 March, 2017
Author: Alexander P
Adult, experienced, male Long-Evans rats prefer red the odor of receptive females to that of non-receptive ones. Polygamous females, however, did not discriminate between the pheromone odor of the ori... Adult, experienced, male Long-Evans rats prefer red the odor of receptive females to that of non-receptive ones. Polygamous females, however, did not discriminate between the pheromone odor of the original male and that of a novel one. Experienced and naive receptive female pheromones preferred the odor of intact males to that of castrates (Carr et al. 1965). Immature males also preferred the odor of normal males over that of castrated...
Posted on: 02 March, 2017
Author: Alexander P
Orientation to a host (or to aggregation pheromones) must inevitably be in opposition to dispersal behavior. The behavioral transition involved has been investigated for aphids (Kennedy and Booth 1963... Orientation to a host (or to aggregation pheromones) must inevitably be in opposition to dispersal behavior. The behavioral transition involved has been investigated for aphids (Kennedy and Booth 1963a, b) and can be explained in terms of «hitting stimulus threshold levels (Johnson 1969). At the beginning of the dispersal phase, the insect has a very low threshold for dispersal stimuli, but a very high concentration. The threshold for host-positive stimuli. In...
Posted on: 02 March, 2017
Author: Alexander P
Thus, the hybrid was most responsive to hybrid males because the mixture of pheromones would excite the maximum number of pheromone receptors. The least complex genetic situation possible is single lo... Thus, the hybrid was most responsive to hybrid males because the mixture of pheromones would excite the maximum number of pheromone receptors. The least complex genetic situation possible is single loci for pheromone and pheromone receptor type. Thus, the genotype for receptors would be TP and those of the backcross to pilifrons would be zTP and PP. The response of backcross females with the TP genotype is expected to...
Posted on: 02 March, 2017
Author: Alexander P
Although the use of different top pheromone attractants is the most obvious method of achieving reproductive isolation, many species apparently employ the same attractant system. In these cases rate o... Although the use of different top pheromone attractants is the most obvious method of achieving reproductive isolation, many species apparently employ the same attractant system. In these cases rate of pheromone release from the female may be a species-specific cue. Particular pheromone concentrations may be required to elicit male attraction, close-range searching behavior and copulatory attempts. Hierarchies of behavioral responses (antennal movement, wing uttering, anemotaxis, etc.) in which each successive...