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Fig. 1. Flow tank schematic. Seawater was first piped into a tilted inflow tank (95
cm wide, not shown), passing over or under four barriers, before spilling into
the flow tank across its full width (black arrows). Flow continued through a
0.75 cm thick Plexiglas baffle (bf) drilled with 0.75 cm holes, two upstream
grilles (ug1 and ug2; 1 cm square mesh, 0.75 cm thick), a behavioural arena
(ba), and a downstream grille (dg) to prevent slugs being swept out of the
tank, before spilling over the downstream end wall (cut 2 cm lower than the
other tank walls). Plexiglas walls spanning the gap between the upstream
grilles created an odour stimulus chamber (osc). This design created
unidirectional flow through the behavioural arena with enough turbulence to
spread fluorescein dye plumes (grey approximates the average plume shape)
similarly to plumes in the field (Wyeth
and Willows, in press). Odor plumes will be similar to these dye
plumes since flow dominates chemical transport under such conditions
(Vogel, 1994). The 2nd
upstream grille also served to obscure any downstream flow patterns
characteristic of the odour sources
(Vogel, 1994). Flow tank
width, 1 m.
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