Variation of Zooplankton Mean Volume Backscattering Strength from Moored and Mobile ADCP Instruments for Diel Vertical Migration Observation
Zooplankton can be detected by using acoustic Doppler current profiler (ADCP) instruments through acquiring the mean volume backscattering strength (MVBS) data. However, the precision of the backscattered signal measured by single ADCP measurement has a limitation in the MVBS variation of zooplankto...
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MDPI AG
2019-05-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/9/9/1851 |
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| author | Angga Dwinovantyo Henry M. Manik Tri Prartono Susilohadi Susilohadi Tohru Mukai |
| author_facet | Angga Dwinovantyo Henry M. Manik Tri Prartono Susilohadi Susilohadi Tohru Mukai |
| author_sort | Angga Dwinovantyo |
| collection | DOAJ |
| description | Zooplankton can be detected by using acoustic Doppler current profiler (ADCP) instruments through acquiring the mean volume backscattering strength (MVBS) data. However, the precision of the backscattered signal measured by single ADCP measurement has a limitation in the MVBS variation of zooplankton. The objectives of this study were to analyze the MVBS and vertical velocity from ADCPs at the same time and location for zooplankton’s daily vertical migration (DVM) observation. Measurements were conducted in Lembeh Strait, North Sulawesi, Indonesia. Instruments used included a moored ADCP 750 kHz and a mobile ADCP 307.2 kHz. High MVBS value was found at 11.5−16 m depths and was identified as the sound scattering layer (SSL). The DVM patterns in the SSL displayed significant differences over time and had good relationships with the diurnal cycle. Theoretical target strength (TS) from the scattering models based on a distorted-wave Born approximation (DWBA) was estimated for <i>Oithona</i> sp. and <i>Paracalanus</i> sp.; the two dominant species found in the observed area. However, ΔMVBS and ΔTS proved that the dominant zooplankton species were not the main scatterers. The strong signal in SSL was instead caused by the schools of various zooplankton species. |
| first_indexed | 2024-12-23T13:07:35Z |
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| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-12-23T13:07:35Z |
| publishDate | 2019-05-01 |
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| record_format | Article |
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| spelling | doaj.art-43f0c4347442438a9de161f2133e02532022-12-21T17:45:50ZengMDPI AGApplied Sciences2076-34172019-05-0199185110.3390/app9091851app9091851Variation of Zooplankton Mean Volume Backscattering Strength from Moored and Mobile ADCP Instruments for Diel Vertical Migration ObservationAngga Dwinovantyo0Henry M. Manik1Tri Prartono2Susilohadi Susilohadi3Tohru Mukai4Graduate School of Marine Technology, PMDSU Batch II, Bogor Agricultural University, Jln. Agatis IPB Dramaga Campus, Bogor 16680, West Java, IndonesiaDepartment of Marine Science and Technology, Faculty of Fisheries and Marine Sciences, Bogor Agricultural University, Jln. Agatis IPB Dramaga Campus, Bogor 16680, West Java, IndonesiaDepartment of Marine Science and Technology, Faculty of Fisheries and Marine Sciences, Bogor Agricultural University, Jln. Agatis IPB Dramaga Campus, Bogor 16680, West Java, IndonesiaMarine Geological Institute, Ministry of Energy and Mineral Resources Republic of Indonesia, Jl. Dr. Djunjunan No. 236, Bandung 40174, West Java, IndonesiaLaboratory of Marine Environment and Resources Sensing, Faculty of Fisheries Sciences, Hokkaido University, 3-1-1, Minato-cho, Hakodate, Hokkaido 041-8611, JapanZooplankton can be detected by using acoustic Doppler current profiler (ADCP) instruments through acquiring the mean volume backscattering strength (MVBS) data. However, the precision of the backscattered signal measured by single ADCP measurement has a limitation in the MVBS variation of zooplankton. The objectives of this study were to analyze the MVBS and vertical velocity from ADCPs at the same time and location for zooplankton’s daily vertical migration (DVM) observation. Measurements were conducted in Lembeh Strait, North Sulawesi, Indonesia. Instruments used included a moored ADCP 750 kHz and a mobile ADCP 307.2 kHz. High MVBS value was found at 11.5−16 m depths and was identified as the sound scattering layer (SSL). The DVM patterns in the SSL displayed significant differences over time and had good relationships with the diurnal cycle. Theoretical target strength (TS) from the scattering models based on a distorted-wave Born approximation (DWBA) was estimated for <i>Oithona</i> sp. and <i>Paracalanus</i> sp.; the two dominant species found in the observed area. However, ΔMVBS and ΔTS proved that the dominant zooplankton species were not the main scatterers. The strong signal in SSL was instead caused by the schools of various zooplankton species.https://www.mdpi.com/2076-3417/9/9/1851ADCPdistorted-wave Born approximation (DWBA)diel vertical migration (DVM)mean volume backscattering strength (MVBS)target strength (TS)zooplankton |
| spellingShingle | Angga Dwinovantyo Henry M. Manik Tri Prartono Susilohadi Susilohadi Tohru Mukai Variation of Zooplankton Mean Volume Backscattering Strength from Moored and Mobile ADCP Instruments for Diel Vertical Migration Observation Applied Sciences ADCP distorted-wave Born approximation (DWBA) diel vertical migration (DVM) mean volume backscattering strength (MVBS) target strength (TS) zooplankton |
| title | Variation of Zooplankton Mean Volume Backscattering Strength from Moored and Mobile ADCP Instruments for Diel Vertical Migration Observation |
| title_full | Variation of Zooplankton Mean Volume Backscattering Strength from Moored and Mobile ADCP Instruments for Diel Vertical Migration Observation |
| title_fullStr | Variation of Zooplankton Mean Volume Backscattering Strength from Moored and Mobile ADCP Instruments for Diel Vertical Migration Observation |
| title_full_unstemmed | Variation of Zooplankton Mean Volume Backscattering Strength from Moored and Mobile ADCP Instruments for Diel Vertical Migration Observation |
| title_short | Variation of Zooplankton Mean Volume Backscattering Strength from Moored and Mobile ADCP Instruments for Diel Vertical Migration Observation |
| title_sort | variation of zooplankton mean volume backscattering strength from moored and mobile adcp instruments for diel vertical migration observation |
| topic | ADCP distorted-wave Born approximation (DWBA) diel vertical migration (DVM) mean volume backscattering strength (MVBS) target strength (TS) zooplankton |
| url | https://www.mdpi.com/2076-3417/9/9/1851 |
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