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...
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
Even slight differentiation between the respective pheromones by Marble and Wardle females was surprising because these populations are separated by a distance of only 20 miles over which tridens is c... Even slight differentiation between the respective pheromones by Marble and Wardle females was surprising because these populations are separated by a distance of only 20 miles over which tridens is continuously distributed. The extremely strong discrimination between Marble and Wardle males by females of Swan and Rodgers indicated that the volatiles produced by males of the two populations were even more different than could have been suspected from the...
Posted on: 02 March, 2017
Author: Alexander P
Let us discuss the top pheromones. The term aphrodisiac is widely used to describe this phenomenon, but care should be exercised in its use because of anthropomorphism, the tendency of anecdotal obser... Let us discuss the top pheromones. The term aphrodisiac is widely used to describe this phenomenon, but care should be exercised in its use because of anthropomorphism, the tendency of anecdotal observations to be given more credence than they deserve, and the assumption that an aphrodisiac is always successful. Male aphrodisiacs are wide- spread and most well known from the Lepidoptera, but even in this group we know...
Posted on: 02 March, 2017
Author: Alexander P
Pheromone olfactory signals are used to delineate the various types of space and are derived from feces, urine and specialized odor-producing skin glands. Changes in the ability to produce and perce... Pheromone olfactory signals are used to delineate the various types of space and are derived from feces, urine and specialized odor-producing skin glands. Changes in the ability to produce and perceive odors match the animals’ spatial requirements. Although the repelling role of spacing is usually emphasized, its attractive functions are just as important. While it is assumed that odor of occupied space is mainly for communication with conspecics there...
Posted on: 02 March, 2017
Author: Alexander P
The pheromone scent trails of some species are more effective than honeybee dances in assembling recruits and in addition can provide information on the vertical component (Lindauer and Kerr, 1958). ... The pheromone scent trails of some species are more effective than honeybee dances in assembling recruits and in addition can provide information on the vertical component (Lindauer and Kerr, 1958). However the pheromone scent trail alone of other species appears to be insufficient to elicit trail-following behaviour of recruits who need to be guided by the scout bee to the food on their initial trip, although thereafter they are...
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
Wynne-Edwards (1962), while discussing the problem of pheromonal homeostasis, i.e. self regulation of natural populations of animals, introduced the concept of ‘epideictic displays’. He s... Wynne-Edwards (1962), while discussing the problem of pheromonal homeostasis, i.e. self regulation of natural populations of animals, introduced the concept of ‘epideictic displays’. He suggested that these are necessary to allow animals to regulate their pheromone numbers and that the special sites on which animals deposit their scent are part of these displays. Most frequently these special sites for scent deposition are dung- hills. Many species of animals form dung-hills (Altmann 1969; Mykytowycz and Gambale...
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
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...