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Chemical signals in animals ![Screenhot_20230418-055553] Screenshot…
Chemical signals in animals ![Screenhot_20230418-055553]
(attached://eecdbda18a268e1961207e93714b2e87 : 150x117 ![. 1
History:🙂🙂chemical signals was discovered by "Adolf Butnedant"
Pheromones:🤔🤔 pheromones are chemical produced as messenger
that affect the behavior of other individual.
Example#1: female silkworm attract
males by releasing pheromone"Bombykol"
Example#2:dog
make territory by urine
Example#3: house cat
rubbing its head against someone to mark i it s territory
Example#4: Ant
produce "alarm pheromones" to protect
themselves
from enemies
Example#5: Queen Honey bee
attract males by "9_oxodeconoic acid"
Example#6: female gypsy moth
may influence male moth by producing : pheromone" disparlure"
Disadvantages
Slow to acte
Cannot be changed
Chemical messages are pass between the member of same specie causes intraspecific communication.
Chemical signals are well developed in those " "unicellular "and " multicellular" organisms that contain "chemoreceptors like
taste buds on tongue. Olfactory bulbs in nose
Example#7:when the young alligator reaches it's maturity releases powerful scent to attract it's mate
Chemical commununication
is most primitive type of communication discovered by "nikolaas tinbergen"
Chemical nature of pheromones
High molecular wieght
(long lasting)
Used for
marking territoy
Low molecular wieght(
airborne and easily dispersed)
Used for
mating and alarm spreading
Use
:mating
Alarm spreading
Marking territoy :
Advantages
Chemical signals are effective over longer distance
Chemical signals are effective in day or night
Definition :chemical signals are molecules that are used for chemical communication between individual are called chemical signals or pheromones.
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