The distribution of pelagic sound scattering layers across the southwest Indian Ocean
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Shallow and deep scattering layers (SLs) were surveyed with split-beam echosounders across the southwest Indian Ocean (SWIO) to investigate their vertical and geographical distribution. Cluster analysis was employed to objectively classify vertical backscatter profiles. Correlations between backscatter and environmental covariates were modelled using generalized additive mixed models (GAMMs) with spatial error structures. Structurally distinct SL regimes were found across the Subantarctic Front. GAMMs indicated a close relationship between sea surface temperature and mean volume backscatter, with significantly elevated backscatter in the subtropical convergence zone. The heterogeneous distribution of scattering layer biota reflects the biogeographic zonation of the survey area and is likely to have implications for predator foraging and carbon cycling in the Indian Ocean.
Boersch-Supan , P H , Rogers , A D & Brierley , A S 2017 , ' The distribution of pelagic sound scattering layers across the southwest Indian Ocean ' Deep Sea Research Part II: Topical Studies in Oceanography , vol 136 , pp. 108-121 . DOI: 10.1016/j.dsr2.2015.06.023
Deep Sea Research Part II: Topical Studies in Oceanography
Copyright © 2015 Elsevier Ltd. All rights reserved. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://dx.doi.org/10.1016/j.dsr2.2015.06.023
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