Eocene evolution of whale hearing

@article{Nummela2004EoceneEO,
  title={Eocene evolution of whale hearing},
  author={Sirpa Nummela and J. G. M. Thewissen and Sunil Bajpai and S. Taseer Hussain and Kishor Kumar},
  journal={Nature},
  year={2004},
  volume={430},
  pages={776-778}
}
The origin of whales (order Cetacea) is one of the best-documented examples of macroevolutionary change in vertebrates. As the earliest whales became obligately marine, all of their organ systems adapted to the new environment. The fossil record indicates that this evolutionary transition took less than 15 million years, and that different organ systems followed different evolutionary trajectories. Here we document the evolutionary changes that took place in the sound transmission mechanism of… 
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The first steps of whale evolution are reviewed, i.e. the transition from a land mammal to obligate marine predators, documented by the Eocene cetacean families of the Indian subcontinent: Pakicetaceae, Ambulocetidae, Remingtonocet Families, Protocet families, and Basilosauridae, as well as their artiodactyl sister group, the Raoellidae.
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Infrasonic and Ultrasonic Hearing Evolved after the Emergence of Modern Whales
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It is demonstrated that early cetaceans presented a cochlear functional pattern close to that of their terrestrial relatives, and that specialization for infrasonic or ultrasonic hearing in Mysticeti or Odontoceti, respectively, instead only occurred in fully aquatic whales, after the emergence of Neoceto (Mysticeti+OdontOCeti).
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The diversification of cetaceans has been accompanied by pervasive molecular adaptations in both sets of genes, including several loci implicated in non-syndromic hearing loss (NSHL), and alongside these adaptive changes, increased evidence of pseudogenization of genes involved in cone-mediated vision in mysticetes and deep diving odontocetes.
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Paleoecology of archaeocete whales throughout the Eocene: Dietary adaptations revealed by microwear analysis
TLDR
Dental enamel microwear analysis of an early Eocene pakicetid, middle Eocene protocetids, and middle-to-late Eocene basilosaurids concludes that cetaceans were not primarily piscivorous, and that piscvory and carnivory evolved from a very diverse diet in Eocene archaeocetes that included various kinds of invertebrates and vertebrates.
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References

SHOWING 1-10 OF 41 REFERENCES
Origin of underwater hearing in whales
TLDR
The incus and mandible of Pakicetus indicate that the path of soundwaves to its ear resembled that of land mammals, and corroborate the hypothesis that artiodactyls are the closest extant relatives of cetaceans.
The Early Radiations of Cetacea (Mammalia): Evolutionary Pattern and Developmental Correlations
TLDR
The origin and early evolution of Cetacea (whales, dolphins, and porpoises) is one of the best examples of macroevolution as documented by fossils, and a study of patterns of correlations among morphological traits to test hypotheses of developmental links among organ systems is suggested.
Terrestrial Mesonychia to Aquatic Cetacea: Transformation of the Basicranium and Evolution of Hearing in Whales
Morphological and stratigraphic evidence indicates that land-living mesonychian ungulates are broadly ancestral to early amphibious and later aquatic cetaceans. The transition from terrestrial…
Origin of Whales in Epicontinental Remnant Seas: New Evidence from the Early Eocene of Pakistan
TLDR
Discovery of Pakicetus strengthens earlier inferences that whales originated from terrestrial carnivorous mammals and suggests that whales made a gradual transition from land to sea in the early Eocene, spending progressively more time feeding on planktivorous fishes in shallow seas and embayments associated with tectonic closure of eastern Tethys.
The Marine Mammal Ear: Specializations for Aquatic Audition and Echolocation
“Marine mammal” is a broad categorization for over 150 species that have one feature in common: the ability to function effectively in an aquatic environment. They have no single common aquatic…
Land-to-sea transition in early whales: evolution of Eocene Archaeoceti (Cetacea) in relation to skeletal proportions and locomotion of living semiaquatic mammals
TLDR
It appears that the land-to-sea transition in whale evolution involved at least two distinct phases of locomotor specialization: hindlimb domination for drag-based pelvic paddling in protocetids (Rodhocetus), with tail elongation for stability, followed by lumbus domination for lift-based caudal undulation and oscillation in basilosaurids (Dorudon).
Vestibular evidence for the evolution of aquatic behaviour in early cetaceans
TLDR
It is hypothesized that the unparalleled modification of the semicircular canal system represented a key ‘point of no return’ event in early cetacean evolution, leading to full independence from life on land.
Hearing in extinct cetaceans as determined by cochlear structure
The bony cochlea is described in representative Odontoceti, Mysticeti and Archaeoceti, with special emphasis on adaptations to high-frequency echolocation. The latter include (a) a small distance…
Evolutionary Morphology and Acoustics in the Dolphin Skull
TLDR
It is the acoustic system, which is clearly dominant and optimized by a highly efficient ultrasound transmitter for echolocation, which may be connected functionally with the unusually well-developed terminalis system.
Homology and Transformation of Cetacean Ectotympanic Structures
TLDR
The ectotympanic bullae of whales and land mammals have many differences that resulted from the morphological divergence of whales from their ungulate ancestors, and ontogenetic alteration of the ancestral precursor condition of the terrestrial ungulates.
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