Pithecia pithecia's behavioral response to decreasing fruit abundance

Area of Science:

• Primate behavior
• Ecology
• Animal nutrition

Background:

• White-faced sakis (Pithecia pithecia) are seed specialists.
• Resource availability significantly impacts primate foraging strategies.
• Understanding behavioral plasticity is crucial for conservation.

Purpose of the Study:

• To document the behavioral responses of white-faced sakis to fruit and water scarcity.
• To analyze changes in diet and foraging patterns during the dry and early wet seasons.
• To investigate the impact of reduced seed availability on sakis' feeding ecology.

Main Methods:

• Observational study of six white-faced sakis on Round Island, Venezuela.
• Data collection occurred between March and May 1996, encompassing dry and early wet seasons.
• Quantified fruit consumption, feeding rates, diet composition, and foraging movement patterns.

Main Results:

• Fruit scarcity, particularly of Licania discolor seeds, led to reduced seed consumption and slower feeding rates.
• Sakis increased intake of young leaves, insects, and flowers.
• Feeding bouts became more frequent but shorter, with decreased distances between bouts and less frequent tree revisits.

Conclusions:

• White-faced sakis exhibit dietary and behavioral flexibility in response to seasonal resource scarcity.
• Changes in foraging patterns reflect adaptive strategies to cope with reduced primary food sources.
• This plasticity is vital for the survival of sakis in environments with fluctuating food availability.