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Transcript

From birth to death:

Life of a blue whale

Introduction

01

Identity card : requal royal

From birth to puberty

02

Birth of a calf

* Gestation period : 9-16 months.
* Size : 4000 kg, 8 m, + 90kg a day.
* Nutrition : 90 kg of the mother's milk per day.
* Other characteristics :
- Ability to swim after 30 mins of being born.
- Having it's mother to help it reach the surface to take it's first breath.
- Leaves its mother at 6-7 months old.


Puberty

* Hits puberty at 9 years and a few months.

* Gives birth to 1 new whale every 2-4 years.
* Rarely gives birth to twins
* Males : use their voices to attract mates.
*Females : choose their mates based on size and depth of voice.

Habitat and reproduction areas

03

"Permanent" habitat for blue whales in the Indian Ocean


Atlantic Ocean Blue Whale Habitat

Pacific Ocean Blue Whale Habitat in Winter

Pacific Ocean Blue Whale Habitat in Summer

Important place of birth

Habitat Pygmi Blue Whale





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The death

05

  • Scientists estimate its life expectancy at 80 years
  • Very rare stranding on shore
  • Primary instinct so as not to drown
  • Walvis Bay, Namibia April 2021
  • Impressive and it attracts the public


After the death

  • at the bottom of the water, the carcass of a whale will feed other marine animals
  • In 18 months, she was already in the state of a skeleton
  • up to 178 species on a single vertebra
  • if the carcass washes up on a shore, scavengers will feed on her



Natural causes of death

  • calves have many predators
  • the young get lost and wash up on the shore
  • diseases and parasites
  • parturition difficulties

Anthropogenic causes of death

Directly
  • collide with ships
  • whaling (aboriginal subsistence/ commercial/ scientific)
  • oil spill
  • the noise


Indirectly
  • chemical contaminants
  • climate change
  • plastic ingetion

Conclusion

Thanks!

Sources:
https://www.twinkl.fr/teaching-wiki/blue-whale https://www.nationalgeographic.com/animals/mammals/facts/blue-whale
https://en.m.wikipedia.org/wiki/Blue_whale
https://www.nhm.ac.uk/bluewhale/ocean/