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Morphological evolution, ecological diversification and climate change in rodents.

Sabrina Renaud1, Jacques Michaux, Daniela N Schmidt

  • 1UMR 5125 CNRS 'Paléoenvironnements et Paléobiosphère', Université Claude Bernard Lyon 1, 69622 Villeurbanne, France. sabrina.recaud@univyon1.fr

Proceedings. Biological Sciences
|April 9, 2005
PubMed
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Climate change drives the evolution of specialist rodents like Stephanomys by creating new ecological niches. Generalist rodents, such as Apodemus, show limited evolution, persisting despite environmental shifts.

Area of Science:

  • Paleontology
  • Evolutionary Biology
  • Ecology

Background:

  • Rodent lineages like Progonomys hispanicus to Stephanomys show significant size and dental specialization over 9 Myr.
  • Contemporaneous generalist lineages, such as Apodemus, exhibit limited morphological evolution.
  • Dental morphology reflects diet and can indicate ecological changes within evolutionary lineages.

Purpose of the Study:

  • To quantify morphological evolution patterns in rodent lineages.
  • To compare evolutionary trends with environmental changes.
  • To investigate the influence of climate on specialist versus generalist species evolution.

Main Methods:

  • Measurement of size and shape of the first upper molar in rodent lineages.
  • Analysis of morphological evolution patterns.

Related Experiment Videos

  • Comparison of evolutionary trends with environmental data.

    • Main Results:

    • The Stephanomys lineage shows increasing size and dental specialization.
    • The Apodemus lineage displays limited morphological evolution.
    • Climate change influences specialist evolution by altering ecological opportunities, while generalists persist.

    Conclusions:

    • Environmental changes, particularly climate-driven vegetation shifts, facilitate the evolution of specialist species.
    • Generalist species like Apodemus can maintain their form without significant evolutionary change when habitats remain viable.
    • This study exemplifies climate's role in shaping specialist evolution, contrasting with the stability of generalists.