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Related Experiment Video

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Ecological Specialization and Evolutionary Reticulation in Extant Hyaenidae.

Michael V Westbury1,2, Diana Le Duc3,4, David A Duchêne2,5

  • 1Department of Mathematics and Natural Sciences, Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany.

Molecular Biology and Evolution
|August 24, 2021
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Summary
This summary is machine-generated.

The genomes of four hyena species reveal their evolutionary history and adaptations. Specialized diets, like insectivory in aardwolves and scavenging in bone-crushing hyenas, drove unique genetic changes and shaped their population diversity.

Keywords:
adaptationcomparative genomicsgenetic diversitygenomehyenaphylogenomics

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Area of Science:

  • * Evolutionary Biology and Genomics
  • * Mammalian Phylogenetics and Adaptation

Background:

  • * The Hyaenidae family, once diverse, now comprises four species: spotted, striped, brown hyenas, and the aardwolf.
  • * Previous research focused on spotted and brown hyenas, leaving the evolutionary genomics of aardwolves, striped, and brown hyenas largely unexplored.
  • * The genetic basis for the distinct lifestyles of scavenging and insectivory in extant hyenas remains unclear.

Purpose of the Study:

  • * To generate and analyze the aardwolf genome alongside other extant hyena species.
  • * To elucidate hyena evolutionary relationships, adaptive genetic underpinnings of their diets, and demographic histories.
  • * To investigate the genomic basis of scavenging and insectivory.

Main Methods:

  • * Whole-genome sequencing of the aardwolf.
  • * Comparative genomic analysis across all four extant hyena species (aardwolf, spotted, striped, brown).
  • * Phylogenetic analyses, selection scans, and demographic modeling.

Main Results:

  • * Evidence of ancient gene flow between aardwolf and ancestral brown/striped hyena lineages.
  • * Identification of genes under selection related to immunity and digestion in bone-crushing hyenas, and craniofacial development in aardwolves.
  • * A family-wide expansion of olfactory receptor genes suggests a crucial role for smell in hyena evolution.
  • * Brown and striped hyenas exhibit low genetic diversity, linked to a long-term decline in population size.
  • * Spotted hyenas and aardwolves show higher genetic diversity and more stable population histories.

Conclusions:

  • * Ecological specialization significantly influences hyena evolutionary trajectories, adaptive genetics, and population dynamics.
  • * Genomic insights reveal key adaptations for diverse feeding strategies within the Hyaenidae family.
  • * Distinct demographic histories correlate with varying levels of genetic diversity across hyena species.