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The birds from Las Hoyas.

José Luis Sanz1, Francisco Ortega

  • 1Unidad de Paleontologia, Departamento de Biología, Universidad Autónoma de Madrid 28049, Cantoblanco, Madrid, Spain. jlsanz@inves.es

Science Progress
|September 10, 2002
PubMed
Summary

Early Cretaceous birds, like those from Las Hoyas, show advanced flight and breathing mechanisms similar to modern birds. Fossil evidence reveals evolutionary trends in avian flight and their place in ancient ecosystems.

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Area of Science:

  • Paleontology
  • Evolutionary Biology
  • Avian Paleontology

Background:

  • Avian evolutionary history is increasingly understood through new fossil discoveries.
  • The fossil record illustrates morphological changes from non-avian theropod dinosaurs to early flying birds.
  • The Las Hoyas fossil site provides key insights into Early Cretaceous avian evolution.

Purpose of the Study:

  • To detail the evolutionary history of early birds based on the Las Hoyas fossil record.
  • To analyze morphological changes in the avian flight apparatus during the transition from terrestrial ancestors to fliers.
  • To understand the functional capabilities and life habits of Early Cretaceous birds.

Main Methods:

  • Analysis of fossil bird genera from the Las Hoyas site (Iberomesornis, Concornis, Eoalulavis).
  • Examination of morphological adaptations related to flight, including wing structure and rectricial fan.
  • Comparative study of Early Cretaceous avian features with those of extant birds.

Main Results:

  • Early Cretaceous birds (approx. 120 million years old) possessed wingbeat cycles and breathing systems comparable to modern birds.
  • The rectricial fan function in these primitive birds was similar to that of extant species.
  • A trend towards increased lift during the evolutionary transition from cursorial ancestors to fliers was observed.
  • Primitive wing aspect ratios were elliptical, with derived morphotypes appearing later in Neornithes.
  • The genus Eoalulavis exhibited an alula similar to modern birds, indicating comparable braking and maneuvering abilities.

Conclusions:

  • Early Cretaceous birds demonstrated sophisticated flight and respiratory systems, nearing modern avian capabilities.
  • Fossil evidence suggests a significant evolutionary trend towards enhanced lift and maneuverability in early avian lineages.
  • The Las Hoyas fossils indicate that early birds occupied a position within the Cretaceous food web, suggesting complex life habits.

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