The distribution of pelagic sound scattering layers across the southwest Indian Ocean

Philipp H. Boersch-Supan; Alex D. Rogers; Andrew S. Brierley

doi:10.1016/j.dsr2.2015.06.023

The distribution of pelagic sound scattering layers across the southwest Indian Ocean

Philipp H. Boersch-Supan, Alex D. Rogers, Andrew S. Brierley

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Pages (from-to)	108-121
Number of pages	14
Journal	Deep Sea Research Part II: Topical Studies in Oceanography
Volume	136
Early online date	14 Jul 2015
DOIs	https://doi.org/10.1016/j.dsr2.2015.06.023
Publication status	Published - Feb 2017

Keywords

Backscatter
Echosounders
Scattering layers
Vertical profiles

Access to Document

10.1016/j.dsr2.2015.06.023

Supan_2015_DSR_Distribution_AM
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
Accepted author manuscript, 2.59 MB

Cite this

@article{f047814ca8c24032ad66d9ea58609e2c,

title = "The distribution of pelagic sound scattering layers across the southwest Indian Ocean",

abstract = "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.",

keywords = "Backscatter, Echosounders, Scattering layers, Vertical profiles",

author = "Boersch-Supan, {Philipp H.} and Rogers, {Alex D.} and Brierley, {Andrew S.}",

note = "Ship of Opportunity Data were sourced from the Integrated Marine Observing System (IMOS)—an initiative of the Australian Government being conducted as part of the National Collaborative Research Infrastructure Strategy and the Super Science Initiative. Other acoustic data were collected as part of the Southwest Indian Ocean Seamounts Project (http://www.iucn.org/marine/seamounts) which was supported supported by the EAF Nansen Project, the Food and Agriculture Organization of the United Nations, the Global Environment Facility, the International Union for the Conservation of Nature, the Natural Environment Research Council (Grant NE/F005504/1), the Leverhulme Trust (Grant F00390C) and the Total Foundation. We thank the Masters, officers, crews and science parties of cruises DFN 2009-410 and JCO66/67 for their assistance during echosounder calibration and data acquisition, and two anonymous reviewers for their comments. PHBS was supported by the German National Academic Foundation, a Cusanuswerk doctoral fellowship, and a Lesley & Charles Hilton-Brown Scholarship.",

year = "2017",

month = feb,

doi = "10.1016/j.dsr2.2015.06.023",

language = "English",

volume = "136",

pages = "108--121",

journal = "Deep Sea Research Part II: Topical Studies in Oceanography",

issn = "0967-0645",

publisher = "PERGAMON-ELSEVIER SCIENCE LTD",

}

TY - JOUR

T1 - The distribution of pelagic sound scattering layers across the southwest Indian Ocean

AU - Boersch-Supan, Philipp H.

AU - Rogers, Alex D.

AU - Brierley, Andrew S.

N1 - Ship of Opportunity Data were sourced from the Integrated Marine Observing System (IMOS)—an initiative of the Australian Government being conducted as part of the National Collaborative Research Infrastructure Strategy and the Super Science Initiative. Other acoustic data were collected as part of the Southwest Indian Ocean Seamounts Project (http://www.iucn.org/marine/seamounts) which was supported supported by the EAF Nansen Project, the Food and Agriculture Organization of the United Nations, the Global Environment Facility, the International Union for the Conservation of Nature, the Natural Environment Research Council (Grant NE/F005504/1), the Leverhulme Trust (Grant F00390C) and the Total Foundation. We thank the Masters, officers, crews and science parties of cruises DFN 2009-410 and JCO66/67 for their assistance during echosounder calibration and data acquisition, and two anonymous reviewers for their comments. PHBS was supported by the German National Academic Foundation, a Cusanuswerk doctoral fellowship, and a Lesley & Charles Hilton-Brown Scholarship.

PY - 2017/2

Y1 - 2017/2

N2 - 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.

AB - 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.

KW - Backscatter

KW - Echosounders

KW - Scattering layers

KW - Vertical profiles

UR - http://www.sciencedirect.com/science/article/pii/S0967064515002258#appd002

U2 - 10.1016/j.dsr2.2015.06.023

DO - 10.1016/j.dsr2.2015.06.023

M3 - Article

SN - 0967-0645

VL - 136

SP - 108

EP - 121

JO - Deep Sea Research Part II: Topical Studies in Oceanography

JF - Deep Sea Research Part II: Topical Studies in Oceanography

ER -

The distribution of pelagic sound scattering layers across the southwest Indian Ocean

Abstract

Keywords

Access to Document

Other files and links

Fingerprint