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...
Posted on: 02 March, 2017
Author: Alexander P
There is little evidence for these pheromones. Indeed, under natural conditions the Nasonov pheromone is effective as an attractant in several different behavioural contexts (i.e. when clustering, at ... There is little evidence for these pheromones. Indeed, under natural conditions the Nasonov pheromone is effective as an attractant in several different behavioural contexts (i.e. when clustering, at the hive entrance, at a source of water) but in each of these situations the nerol and farnesol components appear to have no inuence or are slightly repellent. Frequently two or more pheromones are released during a behavioural situation, sometimes from different castes....
Posted on: 02 March, 2017
Author: Alexander P
In combination with the evolution of glands that secrete and emit pheromones, bees have developed olfactory receptors of high sensitivity, capable of rapid and precise discrimination. Consequently, bi... In combination with the evolution of glands that secrete and emit pheromones, bees have developed olfactory receptors of high sensitivity, capable of rapid and precise discrimination. Consequently, biologists are usually able to produce a satisfactory bioassay for use in the development of a synthetic pheromone. Lack of complete chemical identication of a pher- omone is usually the prime constraint to progress in bee pheromone research. Until recently the minute quantities of material...
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...
Posted on: 02 March, 2017
Author: Alexander P
All kairomone-responding species begin to arrive at, or very shortly after, the initial attack of the host and are thus present and ying in an environment permeated by scolytid aggregation pheromones... All kairomone-responding species begin to arrive at, or very shortly after, the initial attack of the host and are thus present and ying in an environment permeated by scolytid aggregation pheromones. Significantly, all are entomophagous insects which are intimately associated with bark beetles and depend on them as larval and or adult food. The beetles assures simultaneously continued response of female beetles to the area of pheromone release. The...
Posted on: 02 March, 2017
Author: Alexander P
Verification of the interaction of the best pheromones and stridulation has been shown for Dendroctonus pseudotsugae (Rudinsky and Michael 1972). Males stridulate at or near the entrance to a female-o... Verification of the interaction of the best pheromones and stridulation has been shown for Dendroctonus pseudotsugae (Rudinsky and Michael 1972). Males stridulate at or near the entrance to a female-occupied gallery to produce a recog- nizable ‘courtship’ sound, distinguishable in oscilloscope traces from distress sounds. An identical sound is produced on exposure to frontalin, 3-methyl-2-cyc- lohexen-1-one (MCH) and transverbenol, all female-produced pheromones (table 8.1). A D. pseudotsugae female is able...
Posted on: 02 March, 2017
Author: Brunetti Brunetti
There are a few reasons why it makes sense to have a sprinkler system installed instead of relying on manual watering of the land. The major reason why sprinkler systems are so popular these days is b... There are a few reasons why it makes sense to have a sprinkler system installed instead of relying on manual watering of the land. The major reason why sprinkler systems are so popular these days is because they are a far more efficient method of getting water to various parts of your land. Whether it is a residential or a commercial property, the...
Posted on: 02 March, 2017
Author: Alexander P
It has been suggested that bacterial strains which can as a rule be found in normal rat’s pheromone may play an important role in shaping the pheromone odor of individual animals (Reiffe 1956). ... It has been suggested that bacterial strains which can as a rule be found in normal rat’s pheromone may play an important role in shaping the pheromone odor of individual animals (Reiffe 1956). The tracks established by rats and mice within their pheromone ranges facilitate not only their own orientation and movements but also those of newcomers. The wolf also displays a similar habit of marking...
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...
Posted on: 02 March, 2017
Author: Alexander P
Pheromones are found in rabbit litters are deposited in specially dug breeding chambers which, prior to parturition are lined with grass which is usually dry, and fur which the doe plucks from her bel... Pheromones are found in rabbit litters are deposited in specially dug breeding chambers which, prior to parturition are lined with grass which is usually dry, and fur which the doe plucks from her belly, chest and anks. Presumably this fur carries the scent of the female pheromones, particularly the inguinal scent, with which the kittens become familiar very early in their lives. The mother also deposits...