Macrofaunal Patterns in and around du Couedic and Bonney Submarine Canyons, South Australia
Two South Australian canyons, one shelf-incising (du Couedic) and one slope-limited (Bonney) were compared for macrofaunal patterns on the shelf and slope that spanned three water masses. It was hypothesized that community structure would (H1) significantly differ by water mass, (H2) show significan...
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ftpubmed:oai:pubmedcentral.nih.gov:4664417 2023-05-15T14:01:10+02:00 Macrofaunal Patterns in and around du Couedic and Bonney Submarine Canyons, South Australia Conlan, Kathleen E. Currie, David R. Dittmann, Sabine Sorokin, Shirley J. Hendrycks, Ed 2015-11-30 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4664417/ http://www.ncbi.nlm.nih.gov/pubmed/26618354 https://doi.org/10.1371/journal.pone.0143921 en eng Public Library of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4664417/ http://www.ncbi.nlm.nih.gov/pubmed/26618354 http://dx.doi.org/10.1371/journal.pone.0143921 http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited CC-BY Research Article Text 2015 ftpubmed https://doi.org/10.1371/journal.pone.0143921 2015-12-13T01:19:52Z Two South Australian canyons, one shelf-incising (du Couedic) and one slope-limited (Bonney) were compared for macrofaunal patterns on the shelf and slope that spanned three water masses. It was hypothesized that community structure would (H1) significantly differ by water mass, (H2) show significant regional differences and (H3) differ significantly between interior and exterior of each canyon. Five hundred and thirty-one species of macrofauna ≥1 mm were captured at 27 stations situated in depth stratified transects inside and outside the canyons from 100 to1500 m depth. The macrofauna showed a positive relationship to depth in abundance, biomass, species richness and community composition while taxonomic distinctness and evenness remained high at all depths. Biotic variation on the shelf was best defined by variation in bottom water primary production while sediment characteristics and bottom water oxygen, temperature and nutrients defined biotic variation at greater depth. Community structure differed significantly (p<0.01) among the three water masses (shelf-flowing South Australian current, upper slope Flinders current and lower slope Antarctic Intermediate Water) (H1). Although community differences between the du Couedic and Bonney regions were marginally above significance at p = 0.05 (H2), over half of the species captured were unique to each region. This supports the evidence from fish and megafaunal distributions that the du Couedic and Bonney areas are in different bioregions. Overall, the canyon interiors were not significantly different in community composition from the exterior (H3). However, both canyons had higher abundance and/or biomass, increased species dominance, different species composition and coarser sediments near the canyon heads compared to outside the canyons at the same depth (500 m), suggestive of heightened currents within the canyons that influence community composition there. At 1000–1500 m, the canyon interiors were depauperate, typical of V-shaped canyons elsewhere. The ... Text Antarc* Antarctic PubMed Central (PMC) Antarctic Bonney ENVELOPE(162.417,162.417,-77.717,-77.717) Flinders ENVELOPE(-66.667,-66.667,-69.267,-69.267) PLOS ONE 10 11 e0143921 |
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PubMed Central (PMC) |
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ftpubmed |
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English |
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Research Article |
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Research Article Conlan, Kathleen E. Currie, David R. Dittmann, Sabine Sorokin, Shirley J. Hendrycks, Ed Macrofaunal Patterns in and around du Couedic and Bonney Submarine Canyons, South Australia |
topic_facet |
Research Article |
description |
Two South Australian canyons, one shelf-incising (du Couedic) and one slope-limited (Bonney) were compared for macrofaunal patterns on the shelf and slope that spanned three water masses. It was hypothesized that community structure would (H1) significantly differ by water mass, (H2) show significant regional differences and (H3) differ significantly between interior and exterior of each canyon. Five hundred and thirty-one species of macrofauna ≥1 mm were captured at 27 stations situated in depth stratified transects inside and outside the canyons from 100 to1500 m depth. The macrofauna showed a positive relationship to depth in abundance, biomass, species richness and community composition while taxonomic distinctness and evenness remained high at all depths. Biotic variation on the shelf was best defined by variation in bottom water primary production while sediment characteristics and bottom water oxygen, temperature and nutrients defined biotic variation at greater depth. Community structure differed significantly (p<0.01) among the three water masses (shelf-flowing South Australian current, upper slope Flinders current and lower slope Antarctic Intermediate Water) (H1). Although community differences between the du Couedic and Bonney regions were marginally above significance at p = 0.05 (H2), over half of the species captured were unique to each region. This supports the evidence from fish and megafaunal distributions that the du Couedic and Bonney areas are in different bioregions. Overall, the canyon interiors were not significantly different in community composition from the exterior (H3). However, both canyons had higher abundance and/or biomass, increased species dominance, different species composition and coarser sediments near the canyon heads compared to outside the canyons at the same depth (500 m), suggestive of heightened currents within the canyons that influence community composition there. At 1000–1500 m, the canyon interiors were depauperate, typical of V-shaped canyons elsewhere. The ... |
format |
Text |
author |
Conlan, Kathleen E. Currie, David R. Dittmann, Sabine Sorokin, Shirley J. Hendrycks, Ed |
author_facet |
Conlan, Kathleen E. Currie, David R. Dittmann, Sabine Sorokin, Shirley J. Hendrycks, Ed |
author_sort |
Conlan, Kathleen E. |
title |
Macrofaunal Patterns in and around du Couedic and Bonney Submarine Canyons, South Australia |
title_short |
Macrofaunal Patterns in and around du Couedic and Bonney Submarine Canyons, South Australia |
title_full |
Macrofaunal Patterns in and around du Couedic and Bonney Submarine Canyons, South Australia |
title_fullStr |
Macrofaunal Patterns in and around du Couedic and Bonney Submarine Canyons, South Australia |
title_full_unstemmed |
Macrofaunal Patterns in and around du Couedic and Bonney Submarine Canyons, South Australia |
title_sort |
macrofaunal patterns in and around du couedic and bonney submarine canyons, south australia |
publisher |
Public Library of Science |
publishDate |
2015 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4664417/ http://www.ncbi.nlm.nih.gov/pubmed/26618354 https://doi.org/10.1371/journal.pone.0143921 |
long_lat |
ENVELOPE(162.417,162.417,-77.717,-77.717) ENVELOPE(-66.667,-66.667,-69.267,-69.267) |
geographic |
Antarctic Bonney Flinders |
geographic_facet |
Antarctic Bonney Flinders |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4664417/ http://www.ncbi.nlm.nih.gov/pubmed/26618354 http://dx.doi.org/10.1371/journal.pone.0143921 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0143921 |
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PLOS ONE |
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10 |
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11 |
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e0143921 |
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