An integrative modeling approach to elucidate suction-feeding performance

Area of Science:

• * Evolutionary Biology
• * Hydrodynamics
• * Functional Morphology

Background:

• * Suction-feeding research traditionally analyzes isolated components like pressure and flow velocity.
• * A unified approach is lacking to predict overall prey-capture performance from these variables.
• * Understanding the interplay of morphology, kinematics, and fluid mechanics is crucial for aquatic predator-prey dynamics.

Purpose of the Study:

• * To develop a model integrating multiple factors influencing suction-feeding performance.
• * To investigate the morphological and functional traits underlying feeding performance across different prey types in centrarchid fishes.
• * To assess the predictive power of hydrodynamic modeling versus kinematic analysis in explaining feeding strategies.

Main Methods:

• * Development of the suction-induced force-field (SIFF) model, treating prey as a solid particle in unsteady suction flows.
• * Application of the SIFF model to 18 species of centrarchid fishes.
• * Comparison of SIFF model predictions with kinematic data and natural prey use patterns.

Main Results:

• * SIFF model identified distinct trait combinations enabling feeding on attached, evasive, and zooplanktonic prey.
• * Evolution of suction-feeding ability appears largely unconstrained across different ecological axes.
• * SIFF-derived feeding ability estimates better explained centrarchid diets than kinematic traits alone.

Conclusions:

• * The SIFF model provides a robust framework for understanding suction-feeding performance.
• * Hydrodynamic interactions are key to explaining the evolution of feeding strategies in aquatic predators.
• * Mechanistic hydrodynamic models offer significant promise for advancing research in the evolution of feeding performance.