Split-beam target tracking can be used to study the swimming behaviour of deep-living plankton in situ |
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| Institution: | 1. Andrology, Women''s Endocrinology and Gender Incongruence Unit, Department of Experimental and Clinical Biomedical Sciences “Mario Serio”, University of Florence, Florence, Italy;2. Department of Ob/Gyn, George Washington University School of Medicine, Intim Medicine Specialists, Washington, DC, USA;1. Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, USA;2. NIOZ Royal Netherlands Institute for Sea Research, Department of Ocean Systems (OCS), Utrecht University, P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands |
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| Abstract: | A scattering layer consisting mainly of krill (Meganyctiphanes norvegica) was studied with a submersible transducer, to assess the behaviour of individual organisms in situ by means of split-beam target tracking. Individuals were resolved and tracked, but a rapid increase in average swimming speeds with depth suggested that inaccuracies in the angular estimates affected the estimates. Attempts were made to smooth the tracks during post-processing. Smoothed speeds suggested that most (>78%) invertebrates swam at speeds below 12 cm s–1 (mode ~4 cm s–1), with components of speed larger in the horizontal plane than in the vertical. |
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