Aarhus University Seal / Aarhus Universitets segl

Lasse Tor Nielsen Wijewardene: Traits and trade-offs in swimming and feeding of planktonic protists

Seminar: Akvatisk biologi

10.05.2019 | Anne Kirstine Mehlsen

Dato ons 15 maj
Tid 14:00 14:30
Sted Institut for Bioscience, Ole Worms Alle 1, bygning 1135-234

Foredragsholder: Lasse Tor Nielsen Wijewardene, DTU Aqua & Centre for Ocean Life

 

ABSTRACT:

Unicellular flagellates are hugely important to small and large scale processes of aquatic environments, ranging from simple trophic interactions to global biogeochemical cycles. Most of these tiny flagellates catch and eat prey, but to do so must overcome the viscous forces that govern this regime. Swimming and feeding are often intimately related processes, but the fluid dynamics of swimming has mainly been analyzed from point of view of propulsion, not feeding. However, optimal design of body plan and propulsion mechanism for efficient and stealthy swimming may often be in direct conflict with design requirements for efficient feeding, leaving the organism in a behavioral and evolutionary dilemma. We explore how different flagellate designs answer this challenge, through direct observations of prey capture, analytical models and direct measurements of swimming and feeding flows. Various flagella arrangements have evolved, and while some flagellates, e.g., choanoflagellates, rely on filter-feeding, others, e.g., dinoflagellates and haptophytes, are interception- or feeding current feeders. What adaptations have evolved to facilitate prey capture in this highly viscous world, and what are the trade-offs associated with different modes of prey capture?

Institut for Bioscience, Offentligheden / Pressen, Medarbejdere