Host Abundance Predicts Interactive Roles in Neotropical Bat-Bat Fly Interactions

Area of Science:

• Ecology
• Parasitology
• Mammalogy

Background:

• Host traits significantly influence host-parasite interactions across taxa.
• Bat ectoparasite loads are linked to host body size, diet, longevity, and roosting habits.
• Neotropical bats, a diverse mammal group, offer an excellent model for studying host-parasite dynamics.

Purpose of the Study:

• To investigate how functional traits of Neotropical bats affect their importance as hosts for hematophagous bat flies.
• To test the hypothesis that larger, carnivorous, longer-lived, and cavity-roosting bats are more significant hosts.

Main Methods:

• Constructed a comprehensive interaction network of Neotropical bats and bat flies using published data.
• Calculated network metrics to quantify host importance.
• Employed generalized additive mixed models to assess the influence of host traits on host importance.

Main Results:

• Trophic level emerged as the sole significant trait influencing host importance.
• Carnivorous bats were found to be significantly less important hosts compared to herbivorous and omnivorous bats.
• Host abundance, rather than specific traits, appears to be the primary driver of host importance in the bat-bat fly network.

Conclusions:

• Carnivorous bats' lower host importance is likely attributed to their lower population abundance.
• Abundant bat species may play a crucial role as reservoirs for bat flies, facilitating parasite persistence and spread.
• Understanding host abundance is critical for predicting parasite dynamics, especially during host population declines or local extinctions.