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Digital morphology in the Chiroptera: the passive digital lock
1Department of Anatomy, College of Veterinary Medicine, Cornell University, Ithaca, N.Y.
Acta Anatomica
|January 1, 1993
Summary
Bats conserve energy while hanging using a passive digital lock mechanism in their hindlimb digits. This adaptation, varying across species, may enable unique roosting and habitat access.
Area of Science:
- Zoology
- Biomechanics
- Comparative Anatomy
Background:
- Bats utilize hindlimb digits for prolonged hanging during various activities.
- Many bat species possess specialized digital locking mechanisms involving flexor tendons and retinacula.
- This mechanism theoretically conserves energy by preventing muscle contraction during hanging.
Purpose of the Study:
- To investigate the morphology of the passive digital lock in diverse bat species.
- To explore the relationship between digital morphology, ecological diversity, and evolutionary pressures.
- To hypothesize the functional significance of the passive digital lock in bat locomotion and habitat utilization.
Main Methods:
- Dissection of hindlimb digits from 10 bat species across 5 families.
- Scanning electron microscopy to examine digital locking structures.
- Comparative analysis of digital morphology in relation to ecological diversity.
Main Results:
- Significant variation in digital morphology was observed among species with differing ecological niches.
- The passive digital lock mechanism showed variation, being present, modified, or absent in nonhibernating species.
- Vampire bats, adapted for distinct locomotion, lack the passive digital lock.
Conclusions:
- Hibernation and body weight are proposed as key selection pressures for the passive digital lock.
- The passive digital lock is hypothesized to facilitate access to unique habitats for many bat species.
- Bats lacking this lock may employ alternative energy-efficient hanging strategies.