Posted on: 02 March, 2017
Author: Alexander P
In a number of mammalian species, mothers recognize their own young by the olfactory sense. This is true for laboratory rats (Bach and Jaynes 1956; Meyer 1964), mouon (0v1's aries musimon) (Tschanz 1... In a number of mammalian species, mothers recognize their own young by the olfactory sense. This is true for laboratory rats (Bach and Jaynes 1956; Meyer 1964), mouon (0v1's aries musimon) (Tschanz 1962), sheep (Smith 1965), black-tailed deer (0d0c0z'leus heminous columbianus) (Mi'1ller- Schwarze, unpublished), and rabbits (Mykytowycz 1972). Goats recognize their own young by olfaction and taste (Klopfer and Gamble 1966). _ In rats, the retrieving response...
Posted on: 02 March, 2017
Author: Alexander P
An example of a mammalian primer is a factor in top pheromones, the smell of which passively induces neural and hormonal changes in females which culminate in ovulation and sexual behavior 48-72 hours... An example of a mammalian primer is a factor in top pheromones, the smell of which passively induces neural and hormonal changes in females which culminate in ovulation and sexual behavior 48-72 hours later. All mammalian priming functions so far documented are associated in some way with the process of reproduction. Signalling pheromones apparently have diverse functions, but again most are associated with behaviors modulated by the...
Posted on: 02 March, 2017
Author: Alexander P
The pheromone gland is named after the Russian who, in 1883, rst described it; but the function of the gland was then unknown although it was supposed to help in secreting surplus water, possibly fro... The pheromone gland is named after the Russian who, in 1883, rst described it; but the function of the gland was then unknown although it was supposed to help in secreting surplus water, possibly from nectar the bees had collected (Zoubareff, 1883). This erroneous concept was corrected by Sladen (1901, 1902, 1905) who realized that the odour from the gland attracted other bees. This function...
Posted on: 02 March, 2017
Author: Yuga Rishi Shriram Sharma
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...
Posted on: 02 March, 2017
Author: Alexander P
In another experiment, Boch and Morse (1979) divided a colony by a double screen partition and gave each half a queen. Although the top pheromone odours could freely pass though the screen each half w... In another experiment, Boch and Morse (1979) divided a colony by a double screen partition and gave each half a queen. Although the top pheromone odours could freely pass though the screen each half was able to recognize its own - queen when tested several days later, indicating that the queens had not acquired a similar pheromone odour. Therefore, adsorption of odour onto the body...
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
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
The analysis of variation in pheromone systems within and between populations of the same species would constitute a considerable contribution to the understanding of the role of pheromones in reprodu... The analysis of variation in pheromone systems within and between populations of the same species would constitute a considerable contribution to the understanding of the role of pheromones in reproductive isolation. Breeding experiments which test the assortment of different types of pheromones and receptors could be especially useful. The hypothesis presented in this article that differences in pheromone systems of closely related species may result from disruptive selection could be...
Posted on: 02 March, 2017
Author: Alexander P
There are various reasons why young individuals may be kept isolated from other members of their pheromone group by being confined to special sites. Thus they may need better protection from predators... There are various reasons why young individuals may be kept isolated from other members of their pheromone group by being confined to special sites. Thus they may need better protection from predators and adverse climatic conditions or may have to be kept closer to sources of food and water or protected from deliberate or accidental injury by conspecifics. During the course of amatory behavior prior to mating in...
Posted on: 02 March, 2017
Author: Alexander P
When entomologists and chemists originally collaborated to tackle the problem of isolating the top pheromones, they assumed that they were searching for a single compound for each species. How wrong t... When entomologists and chemists originally collaborated to tackle the problem of isolating the top pheromones, they assumed that they were searching for a single compound for each species. How wrong they were! The first successful identication of scolytid pheromones in I. paraconfusus disclosed not one but three compounds (Silverstein et al. 1966) which act together to attract both sexes to a newly attacked host (Wood et al. 1968) (table...