Event Details

Thursday, 20 June 2019 - Thursday, 20 June 2019
1:00 pm - 2:00 pm
UQ Location:
Goddard Building (St Lucia)
Event category(s):

Event Contact

gabriella scata
Org. Unit:
Marine Science

Event Description

Full Description:
The Centre for Marine Sciences is hosting another exciting Special Seminar next Thursday 20th June in Goddard – 257 at 1pm.

Our speaker is Professor Amatzia Genin, from the Interuniversity Institute for Marine Sciences in Eilat on the Red Sea and the Department of Ecology, Evolution & Behavior of The Hebrew University of Jerusalem, Israel.
The title of his talk is “Biomechanics and information processing time as key ecological attributes of planktivory among coral reef fishes”.

Please find below the abstract of the talk.
Many planktivorous fish in the coral reef are site attached, foraging on drifting zooplankton while keeping a nearly-stationary position near their sheltering corals of rocks. Following a visual detection of drifting prey, the fish initiates a rapid, oriented strike to intercept the prey, capturing it using a ram-jaw suction. A biomechanical limitation prevents the fish from striking prey that requires a side-oriented swim relative to the flow. The stronger the current the narrower the striking angle becomes. Therefore, no increase in feeding rate is observed when prey flux is enhanced due to an increase in current speed. On the other hand, predation rates effectively increase with increasing prey densities. In a laboratory flume, some species display a non-leveling functional response, even when prey density is unrealistically high. This outcome is a result of feeding on small aggregations of prey, allowing the fish to suck >1 prey per strike. Some species preferentially strike such aggregations. Using 3D video tracking, we measured the time it takes the fish to initiate a strike after detecting a prey. This processing-time was substantially longer among fish that preferentially orient their strikes on micro-aggregations than in species that displayed no such preference. Yet longer processing time plus the biomechanical limitation prevent the former fish from capturing prey when the currents are strong: by the time the information is processed, the prey had drifted away. The synergetic effect of biomechanical limitation and brain processing-time affect the fish ecology, leading to the absence of species with long-processing time from sites with strong currents.

We hope to see you there! please follow us on our facebook page:

Directions to UQ

Google Map:
To St Lucia Campus, UQ Ipswich, and UQ Gatton.

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