Distribution of Sound Scattering Layers Caused by Euphausiids and Their Relationship to Chlorophyll a Concentrations in the Gulf of St. Lawrence Estuary
A 3-yr study in the Gulf of St. Lawrence estuary using a 120-kHz sounder has shown the existence of a large population of euphausiids consisting of the species Thysanöessa raschii, T. inermis, and Meganyctiphanes norvegica. The sound scattering produced by these animals varied in intensity as the de...
| Published in: | Journal of the Fisheries Research Board of Canada |
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| Main Author: | |
| Format: | Article in Journal/Newspaper |
| Language: | English |
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Canadian Science Publishing
1976
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1139/f76-084 http://www.nrcresearchpress.com/doi/pdf/10.1139/f76-084 |
| Summary: | A 3-yr study in the Gulf of St. Lawrence estuary using a 120-kHz sounder has shown the existence of a large population of euphausiids consisting of the species Thysanöessa raschii, T. inermis, and Meganyctiphanes norvegica. The sound scattering produced by these animals varied in intensity as the density and biomass m −3 of the animals. Chlorophyll a concentrations measured within 5 m of the surface at the same time as the sound scattering layers showed a significant correlation between the numbers of euphausiids m −3 and the concentration of chlorophyll a m −3 . |
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