. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LARVAL SETTLEMENT IN FLOW 369 Paddle Motor ?p 50 cm Flow ^> Larval release. Video fields ,•' EI 2 5 cm Figure 1. Schematics showing the small racetrack flume used in this study. In each trial, the flume was filled with 40 I of either oyster-conditioned seawater (OCW) or glycyl-glycyl-L-arginine (GGR) at a uniform concentration, or with seawater control. Following their release, larvae were video-recorded as they passed for the first time over the working area. (A) Top view indicating the direction of water flow, position
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LARVAL SETTLEMENT IN FLOW 369 Paddle Motor ?p 50 cm Flow ^> Larval release. Video fields ,•' EI 2 5 cm Figure 1. Schematics showing the small racetrack flume used in this study. In each trial, the flume was filled with 40 I of either oyster-conditioned seawater (OCW) or glycyl-glycyl-L-arginine (GGR) at a uniform concentration, or with seawater control. Following their release, larvae were video-recorded as they passed for the first time over the working area. (A) Top view indicating the direction of water flow, position of the paddlewheel, site at which larvae were released, and position and size of the working area in which video records were made. (B) A 3-dimensional view more closely indicating the video fields viewed by each of our two cameras. I = vertical field in the water column as viewed by the side-mounted camera. 2 = hori- zontal field in the bottom boundary layer as viewed by the overhead-mounted camera. Each field was cm long and wide, with a focal depth of cm. macro-lens, were made as larvae passed through the working section. One camera was mounted above and the other to the side of the flume (Fig. 1). Outputs from both cameras were run through a video splitter (Ameri- can Dynamics, model ADI470A), recorded onto a single tape, and viewed on a monitor. The entire working sec- tion was illuminated with dim, far-red light (>650 nm). The side-mounted camera was positioned to view larvae in the free-stream, a minimum of cm above the flume bottom. In contrast, the overhead camera was placed to view larvae within the boundary layer at heights between 0 and 4 mm above the bottom. By using a 4-mm focal depth in video-recordings, individual larvae could be tracked over the entire length of each video field. The field size recorded by each camera was X cm with the long axis parallel to the direction of water flow. Esti- mates of settlement activity were, th
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
