'Ambidexterity' in bat wings as evidenced by bone weight

Area of Science:

• Comparative anatomy
• Vertebrate paleontology
• Biomechanics

Background:

• Tetrapods commonly exhibit one-sided dominance in limb bone development.
• Understanding limb asymmetry is crucial for biomechanical and evolutionary studies.

Purpose of the Study:

• To investigate one-sided dominance in the wing bones of three bat species.
• To evaluate the statistical validity of a previously used criterion for determining bone dominance.

Main Methods:

• Comparative analysis of right and left wing bone weights across three bat species.
• Assessment of a 1% weight difference criterion for dominance as proposed by Dogra & Singh (1971).

Main Results:

• No consistent one-sided dominance was found in the wing bones of the studied bat species.
• Observed weight variations between left and right wing bones suggest a compensatory mechanism for weight and propulsion balance.
• The 1% weight difference criterion is statistically invalid for determining dominance in these bat species.

Conclusions:

• Bats may lack the one-sided limb dominance typical of other tetrapods.
• Wing bone asymmetry in bats likely serves a functional role in maintaining flight balance and efficiency.
• The criterion used by Dogra & Singh (1971) for assessing dominance is unreliable and can be misleading.