Genomic Study Reveals European Origin of Bats
Fossil and genetic evidence overturns previous theories about bat evolution.
1European origin confirmed
Analysis of 103 bat genomes with 699 anatomical characteristics from 65 species (including 44 pre-Quaternary fossils) establishes a 99.2% probability that bats originated in Europe during the Late Paleocene. This overturns previous theories suggesting African, Asian or North American origins. The Bat1K consortium's chromosome-level genome assemblies represent all 21 recognized bat families.
2Diversification timeline
Major bat lineages diversified rapidly during the Early Eocene (~56 million years ago), coinciding with the Paleocene-Eocene Thermal Maximum global warming event. The study used novel statistical models combining genomic data with fossil ages to reconstruct this evolutionary timeline more accurately than previous methods allowed.
3Flight and echolocation link
Placement of the fossil species Vielasia in the oldest branch of the bat family tree indicates laryngeal echolocation predated modern bat diversification. This resolves the long-standing debate about whether flight or echolocation evolved first in bats, showing both traits emerged nearly simultaneously in early European bats.
4Revised family tree
The genomic analysis reorganizes bat phylogeny, placing Madagascar's Myzopodidae family at the base of Vespertilionoidea. It identifies Emballonuroidea and Vespertilionoidea as sister groups. This new framework helps explain how bats' unique traits evolved and provides context for interpreting fossil specimens within the evolutionary timeline.
5Transatlantic migration
The study reveals Noctilionoidea bats likely crossed from Europe to North America via the North Atlantic ~54 million years ago, rather than through Beringia. This migration coincided with tropical expansion in mid-latitudes and early uplift of Panama isthmus islands, which created suitable habitats for bat radiation.
6Research methodology
The Bat1K project combined high-quality chromosome-level genomes from 103 species (42 newly sequenced) with extensive anatomical data. Advanced computational models integrated living species' DNA with fossil records, overcoming previous limitations in evolutionary reconstruction. This approach provides unprecedented resolution of bat origins.
7Scientific significance
The study represents a major advance in understanding mammalian evolution, particularly how bats developed unique capabilities like flight and echolocation. By resolving long-standing phylogenetic questions, it creates a foundation for future research into the molecular basis of bats' extraordinary adaptations to nocturnal flight.
8Future research directions
With a robust phylogenetic framework established, researchers can now investigate the genetic mechanisms behind bats' specialized traits. The Bat1K consortium plans to sequence all living bat species, enabling deeper studies of echolocation genetics, immune system adaptations, and responses to past climate changes that shaped bat evolution.
Original article: Sci.News: Breaking Science News — Genomic Study Reveals European Origin of Bats