Pheromone Reproduction in Insects

Posted on: 02 March, 2017

Author: Alexander P

In Ips the alleles which control both production and reception of pheromones are codominant and autosomal. If a male Ips which is heterozygous for a mutant pheromone allele breeds a female which is he... In Ips the alleles which control both production and reception of pheromones are codominant and autosomal. If a male Ips which is heterozygous for a mutant pheromone allele breeds a female which is heterozygous for a receptor allele keyed to the mutant pheromone, 1/4 of the progeny will be doubly heterozygous, l /2 will carry one mutant allele, and 1/4 will carry no mutant alleles. If...

The Evidence for Pheromones

Posted on: 02 March, 2017

Author: Alexander P

The evidence is increasing in support of Wright’s (1964) prediction that most insects use more than one attractant chemical. Pressures from sympatric upeciu. which utilize a common attractant, c... The evidence is increasing in support of Wright’s (1964) prediction that most insects use more than one attractant chemical. Pressures from sympatric upeciu. which utilize a common attractant, could contribute to the importance placed on secondary chemicals as a means of reducing communication interference. Con- tinued selection could result in the evolution of a pheromone system in which the secondary chemical becomes the main component and the original attt cunt chemical...

Group Pheromone Odors

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...

Primary Pheromone Development

Posted on: 02 March, 2017

Author: Alexander P

With the top pheromones, they could be used as temporary measures until synthetic brood and queen pheromones are available. On most crops honeybees collecting pollen are more effective as pollinators... With the top pheromones, they could be used as temporary measures until synthetic brood and queen pheromones are available. On most crops honeybees collecting pollen are more effective as pollinators than those collecting nectar only. Increasing the amount of brood pheromone which stimulates pollen collection in particular, should also increase pollina- tion. Until relevant synthetic brood pheromone is available minor and inexpensive adaptations to hives that direct foragers to the...

Pheromone Evidence in Insects

Posted on: 02 March, 2017

Author: Alexander P

There is little more evidence for specificity in the Danaiinae. Chemicals are different for each of the species identified (g. 7.1), although only one, the ketone, has been shown to have biological a... There is little more evidence for specificity in the Danaiinae. Chemicals are different for each of the species identified (g. 7.1), although only one, the ketone, has been shown to have biological activity. Antennae of the monarch (which lacks the ketone) respond equally to hair-pencils of the queen, to Lycorea ceres, and to the pure ketone. (2) Pliske and Eisner (1969) suggested that, since the diol from...

Environmental Pheromone Factors

Posted on: 02 March, 2017

Author: Alexander P

You might think that there is not a whole lot you can do to adjust your pheromone cycle. But there is. Beginning in 1974, when I was a graduate student and teaching fellow, I sent teams of undergradua... You might think that there is not a whole lot you can do to adjust your pheromone cycle. But there is. Beginning in 1974, when I was a graduate student and teaching fellow, I sent teams of undergraduate biology students armed with questionnaires, clipboards, and stethoscopes to solicit participation in a series of studies that varied as they progressed. Pheromones have been...

The behavioral components of Pheromones

Posted on: 02 March, 2017

Author: Alexander P

Male Ips pini (Say) horing in pine logs produced an odor which attracted large numbers of beetles from the surrounding forest. Since that time, the top pheromones which promote populatlon aggregation ... Male Ips pini (Say) horing in pine logs produced an odor which attracted large numbers of beetles from the surrounding forest. Since that time, the top pheromones which promote populatlon aggregation have been demonstrated in over 30 species (Borden and Stokink 1971). Chemical identications and/or structures have been described for the pheromones of several species (see table 8.1). A considerable body of data has also accumulated on behavior...

Experimental Pheromone Systems

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...

DO you WISH TO VISUALIZE THE TERRIBLE DANCE OF DESTRUCTION?

Posted on: 02 March, 2017

Today in the world the hot topic discussed by all is global warming, rising temperatures, irregular rainfall and the dire influence seen the world over due to seasonal changes. No doubt the entire world is within its periphery yet we do not know why no country whether it is developed or  a developing one wishes to bring about due changes. Recently in Copenhagen (Denmark) in December 2009 a Global Summit was organized. It was noted that each country said that even if total destruction set in ‘my’ country shall not compromise even a wee bit. IF NOT THEN SAVE PLANET...

Manipulation of Pheromone Signals

Posted on: 02 March, 2017

Author: Alexander P

Individual distance as any other pheromone space varies with the needs or requirements of an individual at a given time. As the production of odor from the skin glands is under the control of sex horm... Individual distance as any other pheromone space varies with the needs or requirements of an individual at a given time. As the production of odor from the skin glands is under the control of sex hormones, individual distances of aggressive animals or those in a pheromone reproductive state will be increased automatically with a repelling or attracting effect depending on their physiological state. Thus...