Pheromones in Rats

Posted on: 02 March, 2017

Author: Alexander P

It is possible that urination in mice replaces the specialized pheromone setting behaviors in other species, since it appears to be under a certain degree of social control. Reynolds (1971) estimated ... It is possible that urination in mice replaces the specialized pheromone setting behaviors in other species, since it appears to be under a certain degree of social control. Reynolds (1971) estimated the amount of urination occurring in encounters between cage owning mice and visitors of both sexes to home cages by measuring the area of urine, as revealed by the blot on the absorbent paper lining of the...

Pheromone Cues in Animals

Posted on: 02 March, 2017

Author: Alexander P

Two additional problems leading to still further complexity in mammals should be mentioned at this time. Both stem from the fact that many mammals rely heavily on a combination of senses in their cont... Two additional problems leading to still further complexity in mammals should be mentioned at this time. Both stem from the fact that many mammals rely heavily on a combination of senses in their continual assessment of their surroundings. Thus olfactory cues are usually not used exclusively as determinants of a particular behavioral response and, in addition, an exceedingly large variety of olfactory cues used by mammals...

Signalling pheromones in other mammals

Posted on: 02 March, 2017

Author: Alexander P

In addition, a variety of studies have shown that neither anosmia nor blinding exert strong effects on pituitary gonadotropin content by themselves but in combination these procedures can drastically ... In addition, a variety of studies have shown that neither anosmia nor blinding exert strong effects on pituitary gonadotropin content by themselves but in combination these procedures can drastically alter hormonal secretion in rats (e.g. Donofrio and Reiter 1972; see also Orbach and Kling 1966). Apparently then the rat has the capacity to use male- but not female- originating primers but long domestication has ensured that their reproduction is not...

Pheromones and Environmental Reproduction

Posted on: 02 March, 2017

Author: Alexander P

Let us return to our basic assumption, that if pheromone odors are to be used for social integration in small mammals that are unable to use visual and acoustic signals, we might expect that the total... Let us return to our basic assumption, that if pheromone odors are to be used for social integration in small mammals that are unable to use visual and acoustic signals, we might expect that the total range of messages to be transmitted is as wide as it is in those species able to use visual and acoustic signals. Surprisingly little attention has been paid...

Different Patterns of Pheromones

Posted on: 02 March, 2017

Author: Alexander P

Different patterns of pheromone distribution of sympatric genetically related species, capable of breeding under laboratory conditions, assist speciation. Young rabbits still at nestling stage, when g... Different patterns of pheromone distribution of sympatric genetically related species, capable of breeding under laboratory conditions, assist speciation. Young rabbits still at nestling stage, when given the choice between articial nests with and without rabbit odor, display apreference for the nests which had the scent of their own species (Gambale and Dudzinski, unpublished). Specific odor of Pheromones There is ample evidence that when animals enter the area of a strange population they can detect...

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...

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...

Disruptive selection against the pheromone system

Posted on: 02 March, 2017

Author: Alexander P

Disruptive selection against the pheromone system could accommodate the co- existence of two species which use the same pheromones but occupy different niches. Cross attraction could result in intersp... Disruptive selection against the pheromone system could accommodate the co- existence of two species which use the same pheromones but occupy different niches. Cross attraction could result in interspecic mating or, in the case of bark beetles, increased cohabitation and mutually disadvantageous competition for the same host material. Perhaps pheromone variability between eastern and western 1. pini (Lanier et al. l972) resulted from disruptive selection for pheromone specificity with respect to...

Forms of Social Pheromones

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...