A Game of Tails: MfN scientists uncover the evolutionary driver behind the armored tails of real dragons

idw – Informationsdienst Wissenschaft

Nachrichten, Termine, Experten

Grafik: idw-Logo

13.02.2020 09:58

A Game of Tails: MfN scientists uncover the evolutionary driver behind the armored tails of real dragons

Dr. Gesine Steiner Pressestelle
Museum für Naturkunde - Leibniz-Institut für Evolutions- und Biodiversitätsforschung

    Reptiles appear globally – from slow worms in Germany, to dragon lizards in Australia, and Komodo monitors in Indonesia. Despite their variety of body forms and lifestyles, most reptiles have tails, which can be involved in balance and movement or used as a weapon. The latter strategy was employed also by dinosaurs, like Stegosaurus and Ankylosaurus, who used their tails as giant spiked weapons. Some species of extant reptiles have also evolved specialized spiked tail scales during their long evolutionary history over millions of years. However little is known about why exactly the tail spikes evolved, and if they are employed as weapons just as in dinosaurs.

    Now researchers from the Museum für Naturkunde in Berlin showed: Lizards living in rocky habitats are significantly more likely to have evolved tail armor than their relatives who live in other habitat types, for example, species that burrow underground or those that live in trees. These findings, published in Biology Letters by MfN researchers Till Ramm and Johannes Müller with Emily Roycroft, their colleague at the University of Melbourne, gives new insights into what drives the independent evolution of similar physical characteristics, and clarifies the evolution of tail spines in reptiles.

    “A fundamental goal in evolutionary biology is understanding how selective pressures shape the extensive phenotypic diversity of life.” says lead author Till Ramm.
    To understand what factors lead to the evolution of tail armor, he collated a data set including 2877 reptile species and recorded details on their tails, as well as their habitat. While it has been previously suggested that tail armor evolves in response to pressure from predators, Ramm and colleagues showed that microhabitat use predicts the evolution of tail armor. Most likely, the animals use their armored tails to prevent attacks by predators by blocking access to their rocky habitats. This strategy seems so successful, that it evolved over 30 times independently in different groups of reptiles. “These findings highlight the complex interaction between environment and predator-prey interactions as drivers in the evolution of defensive morphologies in reptiles.” concludes Prof. Müller.

    Merkmale dieser Pressemitteilung:
    Biologie, Geowissenschaften, Tier / Land / Forst, Umwelt / Ökologie
    Forschungsergebnisse, Wissenschaftliche Publikationen


    Die Suche / Erweiterte Suche im idw-Archiv

    Sie können Suchbegriffe mit und, oder und / oder nicht verknüpfen, z. B. Philo nicht logie.


    Verknüpfungen können Sie mit Klammern voneinander trennen, z. B. (Philo nicht logie) oder (Psycho und logie).


    Zusammenhängende Worte werden als Wortgruppe gesucht, wenn Sie sie in Anführungsstriche setzen, z. B. „Bundesrepublik Deutschland“.


    Die Erweiterte Suche können Sie auch nutzen, ohne Suchbegriffe einzugeben. Sie orientiert sich dann an den Kriterien, die Sie ausgewählt haben (z. B. nach dem Land oder dem Sachgebiet).

    Haben Sie in einer Kategorie kein Kriterium ausgewählt, wird die gesamte Kategorie durchsucht (z.B. alle Sachgebiete oder alle Länder).

    Cookies optimieren die Bereitstellung unserer Dienste. Durch das Weitersurfen auf idw-online.de erklären Sie sich mit der Verwendung von Cookies einverstanden. Datenschutzerklärung