Trophic importance of kelp-derived suspended particulate matter in a through-flow sub-Antarctic system

S. Kaehler, EA Pakhomov, Robert Kalin, S. Davis

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Spatial dynamics of surface chlorophyll concentrations, diatom abundance and carbon and nitrogen stable isotope signatures of surface suspended particulate matter (SPM) were investigated during a bloom event observed in March 2003 in the vicinity of the sub-Antarctic Prince Edward Islands. The surface water composition was studied to estimate the overall importance and spatial extent of kelp derived SPM in the water column of the islands. It was observed that high chlorophyll concentrations (up to 2 mg m–3) between and downstream of the islands could not be explained by the development of the diatom bloom. Instead, microscopic and stable isotope analyses suggested that the chlorophyll signal was largely derived from the residual chlorophyll in fresh and decaying particles of small fragments of the kelp Macrocystis laevis, an endemic kelp species abundant along the shoreline of the islands. The findings of this study suggest that the dietary subsidy of kelp-derived carbon and nitrogen to benthic communities and possibly the plankton is not limited to the vicinity of kelp beds, but rather is a widespread phenomenon between the islands. Due to the dominating unidirectional Antarctic Circumpolar Current, large quantities of kelp-derived SPM may be transported and utilised tens of kilometres downstream of the islands.
Original languageEnglish
Pages (from-to)17-22
Number of pages6
JournalMarine Ecology Progress Series
Volume316
DOIs
Publication statusPublished - 2006

Fingerprint

suspended particulate matter
macroalgae
particulates
chlorophyll
stable isotopes
algal bloom
stable isotope
diatom
Macrocystis
Prince Edward Island
circumpolar current
Bacillariophyceae
carbon
diet study techniques
nitrogen isotope
nitrogen
subsidies
hydrochemistry
algal blooms
benthos

Keywords

  • kelp
  • suspended particulate matter
  • SPM
  • tropic subsidy
  • sub-Antarctic

Cite this

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title = "Trophic importance of kelp-derived suspended particulate matter in a through-flow sub-Antarctic system",
abstract = "Spatial dynamics of surface chlorophyll concentrations, diatom abundance and carbon and nitrogen stable isotope signatures of surface suspended particulate matter (SPM) were investigated during a bloom event observed in March 2003 in the vicinity of the sub-Antarctic Prince Edward Islands. The surface water composition was studied to estimate the overall importance and spatial extent of kelp derived SPM in the water column of the islands. It was observed that high chlorophyll concentrations (up to 2 mg m–3) between and downstream of the islands could not be explained by the development of the diatom bloom. Instead, microscopic and stable isotope analyses suggested that the chlorophyll signal was largely derived from the residual chlorophyll in fresh and decaying particles of small fragments of the kelp Macrocystis laevis, an endemic kelp species abundant along the shoreline of the islands. The findings of this study suggest that the dietary subsidy of kelp-derived carbon and nitrogen to benthic communities and possibly the plankton is not limited to the vicinity of kelp beds, but rather is a widespread phenomenon between the islands. Due to the dominating unidirectional Antarctic Circumpolar Current, large quantities of kelp-derived SPM may be transported and utilised tens of kilometres downstream of the islands.",
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Trophic importance of kelp-derived suspended particulate matter in a through-flow sub-Antarctic system. / Kaehler, S.; Pakhomov, EA; Kalin, Robert; Davis, S.

In: Marine Ecology Progress Series, Vol. 316, 2006, p. 17-22.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Trophic importance of kelp-derived suspended particulate matter in a through-flow sub-Antarctic system

AU - Kaehler, S.

AU - Pakhomov, EA

AU - Kalin, Robert

AU - Davis, S.

PY - 2006

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AB - Spatial dynamics of surface chlorophyll concentrations, diatom abundance and carbon and nitrogen stable isotope signatures of surface suspended particulate matter (SPM) were investigated during a bloom event observed in March 2003 in the vicinity of the sub-Antarctic Prince Edward Islands. The surface water composition was studied to estimate the overall importance and spatial extent of kelp derived SPM in the water column of the islands. It was observed that high chlorophyll concentrations (up to 2 mg m–3) between and downstream of the islands could not be explained by the development of the diatom bloom. Instead, microscopic and stable isotope analyses suggested that the chlorophyll signal was largely derived from the residual chlorophyll in fresh and decaying particles of small fragments of the kelp Macrocystis laevis, an endemic kelp species abundant along the shoreline of the islands. The findings of this study suggest that the dietary subsidy of kelp-derived carbon and nitrogen to benthic communities and possibly the plankton is not limited to the vicinity of kelp beds, but rather is a widespread phenomenon between the islands. Due to the dominating unidirectional Antarctic Circumpolar Current, large quantities of kelp-derived SPM may be transported and utilised tens of kilometres downstream of the islands.

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KW - SPM

KW - tropic subsidy

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