Large scale patterns in vertical distribution and behaviour of mesopelagic scattering layers
AuthorsKlevjer, Thor Aleksander
Benítez-Barrios, V. M.
KAUST DepartmentBiological and Environmental Sciences and Engineering (BESE) Division
Marine Science Program
Office of the VP
Red Sea Research Center (RSRC)
Online Publication Date2016-01-27
Print Publication Date2016-04
Permanent link to this recordhttp://hdl.handle.net/10754/595159
MetadataShow full item record
AbstractRecent studies suggest that previous estimates of mesopelagic biomasses are severely biased, with the new, higher estimates underlining the need to unveil behaviourally mediated coupling between shallow and deep ocean habitats. We analysed vertical distribution and diel vertical migration (DVM) of mesopelagic acoustic scattering layers (SLs) recorded at 38 kHz across oceanographic regimes encountered during the circumglobal Malaspina expedition. Mesopelagic SLs were observed in all areas covered, but vertical distributions and DVM patterns varied markedly. The distribution of mesopelagic backscatter was deepest in the southern Indian Ocean (weighted mean daytime depth: WMD 590 m) and shallowest at the oxygen minimum zone in the eastern Pacific (WMD 350 m). DVM was evident in all areas covered, on average ~50% of mesopelagic backscatter made daily excursions from mesopelagic depths to shallow waters. There were marked differences in migrating proportions between the regions, ranging from ~20% in the Indian Ocean to ~90% in the Eastern Pacific. Overall the data suggest strong spatial gradients in mesopelagic DVM patterns, with implied ecological and biogeochemical consequences. Our results suggest that parts of this spatial variability can be explained by horizontal patterns in physical-chemical properties of water masses, such as oxygen, temperature and turbidity.
CitationLarge scale patterns in vertical distribution and behaviour of mesopelagic scattering layers 2016, 6:19873 Scientific Reports
RelationsIs Referenced By:
Klevjer, T. A., Martinez, U., Boyra, G., Røstad, A., Kaartvedt, S., & Irigoien, X. (2020). Integrated daytime EK60 echosounder data from Malaspina-2010 cruise [Data set]. PANGAEA - Data Publisher for Earth & Environmental Science. https://doi.org/10.1594/PANGAEA.923087. DOI: 10.1594/pangaea.923087 Handle: 10754/668133
Klevjer, T. A., Martinez, U., Boyra, G., Røstad, A., Kaartvedt, S., & Irigoien, X. (2021). Per station summaries of acoustic water column properties during MALASPINA-2010 [Data set]. PANGAEA - Data Publisher for Earth & Environmental Science. https://doi.org/10.1594/PANGAEA.926619. DOI: 10.1594/pangaea.926619 Handle: 10754/668153
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