Diurnal, Nocturnal, and Crepuscular
Published on Nov 18, 2015
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PRESENTATION OUTLINE
Diurnality
- What: describes an organism's behavior during the day
- Where: takes place in living things
- When: daytime
- How: external patterns of environment, such as time of day, control activity
- Whom: affects all organisms active during day
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Why? Nocturnal and crepuscular animals are domesticated as household pets to coincide with humans.
Photo by eliduke
Some diurnal animals are humans, birds, elephants, pets, squirrels, and many others
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Nocturnality
- What: describes plant and animal behavior in the night
- Where: takes place in living things
- When: during the night
- How: niche differentiation, where a species' niche is separated by amount of time
- Whom: affects all living things active in the night
Photo by Alain Bourque
Why?
Many ancestors of modern day mammals evolved nocturnal characteristics to avoid contact with numerous diurnal predators.
Photo by KrzysztofTe Foto Blog
Crepuscular
CREPUSCULAR animals are those that are active during twilight
Photo by Richard Walker Photography
CREPUSCULARITY
- What: describes plant and animal behavior during twilight
- Where: takes place in living things
- When: during twilight
- How: daylight cycle patterns, control activity
- Whom: affects all living things active at twilight
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Why? Crepuscular animals forage at twilight, when there are less predators and more prey.
Photo by -Porsupah-
Some crepuscular animals are:
ocelots, hyenas, flying squirrels, nighthawk, and bobcats.
Photo by e_monk
Why does this all matter?
Without diurnality, nocturnality, and crepuscularity, all organisms would have the same cycle, which would cause chaos and possibly a lack of prey for certain animals. Food chains and food webs would be unbalanced, eventually leading to extinction.
Photo by cliff1066™
