Cheek pouch capacity in heteromyid rodents

Area of Science:

• Zoology
• Ecology
• Evolutionary Biology

Background:

• Rodent cheek pouches are crucial for resource transport.
• Understanding allometric relationships in rodents provides insights into ecological adaptations.

Purpose of the Study:

• To investigate the relationship between cheek pouch volume and body mass in heteromyid rodents.
• To determine if food type influences this allometric scaling.

Main Methods:

• Collected data on cheek pouch volumes and body mass for 12 heteromyid rodent species.
• Analyzed allometric relationships (V=0.065 M^0.887) across different genera and feeding strategies.

Main Results:

• A significant positive correlation was found between cheek pouch volume and body mass across most heteromyid species.
• Genera like Microdipodops, Perognathus, and Thomomys closely followed the allometric relationship.
• Dipodomys showed deviations, particularly those feeding on high-density seeds, suggesting a size threshold effect.

Conclusions:

• Body mass and food density are key determinants of cheek pouch capacity in heteromyid rodents.
• Dietary adaptations, especially for high-value food items, can alter expected allometric scaling.
• Cheek pouch size is a significant factor in energy acquisition for these rodents.