Animal Behavior: Innate - Patliputra Universityppup.ac.in/download/econtent/pdf/BSc.-3 Animal... ·...
Transcript of Animal Behavior: Innate - Patliputra Universityppup.ac.in/download/econtent/pdf/BSc.-3 Animal... ·...
Animal Behavior: Innate
Presented by :
ShushmaKumari
HOD & Assistant Professor,
Zoology, J. D. W. College, Patna
B.Sc. Part-I Paper - II
The first type is innate behavior.From Latin . innatus "inborn,“
Innate behaviors are those you develop on your own,
which do not need to be taught or learned.
Innate behavior is something the animal is born knowing
how to do.
Examples include fish swimming and geese migrating.
What other examples can you think of?
Innate behavior
Behavior determined by the "hard-wiring" of the nervous
system is Innate behavior .
It is usually inflexible, a given stimulus triggering a given
response.
Example: A salamander raised away from water until long
after its siblings begin swimming successfully will swim
every bit as well as they the very first time it is placed in the
water.
Clearly this rather elaborate response is "built in" in the
species and not something that must be acquired by practice.
Types of innate behaviorIrritability
Tropism
Nasties
Taxis
Kinesis
Reflex action
Instinct
Motivation
Let‘s study detail
Types if innate behavior1: Irritability
def.: Irritability is an excessive response to stimuli.
Conditions
Irritability can occur in people experiencing any of a variety
of conditions, including:
Anxiety
Alcoholism
Fever
2: tropism :
Cause of name: (from Greek trope, "a turning")
Def: it is a biological phenomenon, indicating growth or turning
movement of a biological organism, usually a plant, in response to an
environmental In tropisms, this response is dependent on the
direction of the stimulus
Tropisms are typically associated with plants.
Types of tropism
Chemotropism, movement or growth in response to
chemicals
Geotropism (or gravitropism), movement or growth in
response to gravity
Heliotropism, movement or growth in response to sunlight
Sonotropism, movement or growth in response to sound.
Hydrotropism, movement or growth in response to water
Phototropism, movement or growth in response to lights or
colors of light (e.g.- the sunflower)
Types of tropismThermotropism, movement or growth in response to
temperature
Electrotropism, movement or growth in response to an
electric field
Thigmotropism, movement or growth in response to touch
or contact
3:nastiesDef:
these Are non directional responses to stimuli (e.g.
temperature, humidity, light irradiance), and are usually
associated with plants
The movement can be due to changes in turgor or changes in
growth.
Nastic movements differ from tropic movements in that the
direction of tropic responses depends on the direction of the
stimulus, whereas the direction of nastic movements is
independent of the stimulus' position.
Types of nastiesEpinasty: downward-bending from growth at the top, for
example, the bending down of a heavy flower.
Photonasty: response to light
Nyctinasty: movements at night or in the dark
Chemonasty: response to chemicals or nutrients
Hydronasty: response to water
Thermonasty: response to temperature
Geonasty/gravinasty: response to gravity
Thigmonasty/seismonasty/haptonasty: response to contact
Examples of nasties
To be contd…