Perch time allocation and feeding efficiency of flycatching Rhinolophus formosae: an optimal foraging behavior?

Area of Science:

• Behavioral Ecology
• Bat Foraging Strategies
• Echolocation in Bats

Background:

• Flycatching bats, primarily horseshoe bats (Rhinolophidae), are rare and employ a hang-and-wait foraging strategy.
• Their constant-frequency echolocation aids energetics and prey detection, but foraging behavior remains understudied.
• This study investigates perch use and foraging performance in Rhinolophus formosae.

Purpose of the Study:

• To assess perch use and foraging performance in Rhinolophus formosae.
• To understand perch time allocation strategies in flycatching bats.
• To provide insights into optimal foraging behavior in this bat species.

Main Methods:

• Field observations of perch use and foraging behavior.
• Analysis of residence time, attack rates, and capture success.
• Correlation analysis of perch switching with foraging efficiency.

Main Results:

• Foraging behavior showed seasonal variations, with higher attack rates in late spring/early summer and lower capture rates when young bats were active.
• Attack rate decreased with increased perch switching, while capture rate increased.
• Bats spent more time at sites but less time per perch when switching frequently.

Conclusions:

• Rhinolophus formosae increases perch switching in low-prey conditions to enhance capture rates.
• Bats adapt foraging by scanning wider areas and optimizing perch time.
• Findings support optimal foraging theory and highlight the need for further research on flycatching bat behavior.