Evidence for a Dome-Shaped Relationship Between Turbulence and Larval Fish Ingestion Rates

• Published in: Limnology and oceanography Vol. 39; no. 8; pp. 1790 - 1799
• Main Authors: MacKenzie, Brian R., Miller, Thomas J., Cyr, Stephane, Leggett, William C.
• Format: Journal Article
• Language: English
• Published: Waco, TX American Society of Limnology and Oceanography 01-12-1994
• Subjects: Animal, plant and microbial ecology; Biological and medical sciences; Brackish; Fish larvae; Freshwater; Fundamental and applied biological sciences. Psychology; General aspects. Techniques; Ingestion; Larvae; Marine; Marine fishes; Methods and techniques (sampling, tagging, trapping, modelling...); Pisces; Plankton; Predators; Swimming; Turbulence; Turbulence models; Velocity; Aquatic environment; Geometrical shape; Vertebrata; Correlation; Turbulence; Larva; Food intake; Pisces; Environmental factor; Mathematical model; Zooplankton
• ISSN: 0024-3590; 1939-5590
• DOI: 10.4319/lo.1994.39.8.1790

Recent theoretical work suggests that small-scale turbulence enhances encounter rates between larval fish and treir prey. This finding has been extended to suggest that feeding rates will increase in turbulent environments. However, this extrapolation assumes that turbulence has no detrimental effects on post-encounter behaviors (e.g. pursuit success). We develop an analytical model to estimate the probability that larval fish feeding in turbulent environments successfully pursue encountered prey. We show that the overall probability of feeding is a dome-shaped function of turbulent velocity and that the height and location of the maxima depend on turbulence level and the behavioral characteristics of predator and prey. Highly, turbulent conditions (e.g. storms) will reduce feeding rates below those which occur during calmer conditions and will affect the type of prey captured and ingested.