Conserved spatio-temporal patterns of suction-feeding flows across aquatic vertebrates: a comparative flow...

Area of Science:

• Ecology and Evolutionary Biology
• Biomechanics
• Hydrodynamics

Background:

• Suction feeding is a primary prey capture method for aquatic vertebrates, particularly fishes.
• Significant diversity exists in skull and mouth morphology among suction feeders, suggesting varied feeding strategies.
• The variability of suction flow patterns and their role in supporting trophic diversity remain largely unexplored.

Purpose of the Study:

• To investigate the spatio-temporal patterns of suction flow fields in 14 aquatic suction-feeding species.
• To determine if variations in suction flow hydrodynamics correlate with trophic diversity.
• To identify key factors influencing suction-feeding dynamics.

Main Methods:

• Employed high-speed flow visualization to capture feeding events.
• Analyzed flow fields to characterize spatio-temporal patterns.
• Quantified flow speed, affected volume, and timing relative to mouth gape.

Main Results:

• Suction-feeding hydrodynamics are highly conserved across the studied species.
• Feeding-induced flows were limited to approximately one gape diameter from the mouth.
• Flow speed correlated positively with mouth diameter and inversely with time to peak gape.

Conclusions:

• Trophic diversity in fishes is not driven by diverse suction flow mechanisms.
• The conserved nature of suction flow, without strong trade-offs, facilitates broad trophic specialization.
• Suction feeding's adaptability, rather than flow variability, underpins its ecological success.