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Related Experiment Videos

Cetacean brains: how aquatic are they?

Lori Marino1

  • 1Neuroscience and Behavioral Biology Program, Emory University, Atlanta, Georgia 30322, USA. lmarino@emory.edu

Anatomical Record (Hoboken, N.J. : 2007)
|May 23, 2007
PubMed
Summary
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Large brains in cetaceans (whales and dolphins) evolved long after their aquatic adaptation, challenging the idea that water life alone drives brain size. Social complexity, not aquaticism, likely explains cetacean brain enlargement.

Area of Science:

  • Evolutionary biology
  • Comparative neuroanatomy
  • Mammalian adaptation

Background:

  • Cetaceans exhibit dramatic evolutionary transformations, notably a fully aquatic lifestyle and large brains.
  • The relationship between aquatic adaptation and brain size in mammals is a key area of research.

Purpose of the Study:

  • To review comparative neuroanatomy of aquatic mammals (cetaceans, sirenians, pinnipeds, fossil archaeocetes).
  • To investigate the hypothesis that a fully aquatic lifestyle directly leads to large cetacean brains.

Main Methods:

  • Comparative neuroanatomical analysis of various aquatic mammal brains.
  • Review of paleontological evidence on cetacean brain size evolution.

Main Results:

Related Experiment Videos

  • Paleontological data indicates cetacean brain enlargement occurred millions of years after adaptation to aquatic life.
  • Neuroanatomical comparisons do not support aquaticism as the sole driver for odontocete brain size, encephalization, or gyrification.
  • Echolocation, while present in some aquatic mammals, is not universally linked to high encephalization, even in terrestrial species.

    • Conclusions:

    • The hypothesis linking a fully aquatic lifestyle directly to large cetacean brains is not supported by current evidence.
    • High encephalization levels in odontocetes are more likely attributed to complex social behaviors than aquatic adaptation alone.