Are toe fringes important for lizard burying in highly mobile sand?

Area of Science:

• Evolutionary biology
• Herpetology
• Biomechanics

Background:

• Toe fringes are crucial adaptations for lizards inhabiting sandy environments.
• Understanding fringe function in relation to substrate properties is key to lizard adaptation in sand dune ecosystems.

Purpose of the Study:

• To investigate the sand burial performance of Phrynocephalus mystaceus on varied sand substrates.
• To assess if toe fringe function changes with substrate properties, particularly in highly mobile sands.
• To determine the role of toe fringes in lizard adaptation to sand dune environments.

Main Methods:

• Experimental manipulation of toe fringes in Phrynocephalus mystaceus.
• Testing sand burial performance on different sand substrates (varying mesh sizes and stability angles).
• Analysis using LASSO and path analysis models to correlate substrate properties with burial performance.

Main Results:

• Sand burial performance was significantly influenced by substrate properties and the presence/absence of toe fringes.
• Removal of toe fringes led to improved sand burial scores on finer (below 100 mesh) and less stable sand substrates.
• Substrate stability angle showed an inverse relationship with sand burial performance after toe fringe removal.

Conclusions:

• The sand burial function of toe fringes may be less effective or even detrimental in highly mobile sand substrates.
• Toe fringe functionality might be more critical for locomotion (running) on sand rather than for burial.
• Further research is needed to elucidate the precise role of toe fringes in lizard locomotion and adaptation.