Evaluating chlorophyll depletion in mitigation mussel cultivation at multiple scales

Jens Kjerulf Petersen, Lars-Ove Loo, Daniel Taylor*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Implementation of mussel culture for mitigating nutrient enrichment of coastal waters aims to optimize growth of mussels at production carrying capacity for maximum nutrient extraction. Simplified approaches for describing reductions in chlorophyll concentrations for the strategic deployment of mitigation units with regards to limited space and biophysical conditions can facilitate the proliferation of mitigation culture as a tool. Here we report data on measured chl a depletion at different scales in and around a mussel culture unit in western Sweden. A monitoring program was set up for a production period of 15 mo to characterize patterns of chl a depletion. The water column was almost permanently stratified, and concentrations of chl awere higher outside of the culture unit and autocorrelated within the unit by vertical and horizontal dimensions. Depletion of chl a within the culture unit during a focused sampling campaign period was negatively correlated with current velocity, greatest in the center of the unit (ca. 60% of ambient chl a concentrations) and lowest at the unit borders. Depletion was observed at the micro-scale within the boundary layer around the mussel aggregates, corresponding to a depletion gradient from the mussel aggregate surface of 0.074 µg l−1 cm−1. Shell length increment ranged between 0.04 and 0.29 mm d−1 and specific growth rate ranged between 0 and 4.6% of dry weight d−1. A simple model was applied to evaluate scenarios of alternate farm configurations and fit to measured depletion. Model runs showed that the angle of incoming flow is important in a low-current regime (i.e. <10 cm s−1), and orientating the culture unit in line with predominant current directions would allow for enhanced reduction of chl a.
Original languageEnglish
JournalAquaculture Environment Interactions
Volume11
Pages (from-to)263-278
ISSN1869-215X
DOIs
Publication statusPublished - 2019

Keywords

  • Mussel cultivation
  • Eutrophication
  • Mitigation
  • Mytilus edulis
  • Chlorophyll depletio

Cite this

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title = "Evaluating chlorophyll depletion in mitigation mussel cultivation at multiple scales",
abstract = "Implementation of mussel culture for mitigating nutrient enrichment of coastal waters aims to optimize growth of mussels at production carrying capacity for maximum nutrient extraction. Simplified approaches for describing reductions in chlorophyll concentrations for the strategic deployment of mitigation units with regards to limited space and biophysical conditions can facilitate the proliferation of mitigation culture as a tool. Here we report data on measured chl a depletion at different scales in and around a mussel culture unit in western Sweden. A monitoring program was set up for a production period of 15 mo to characterize patterns of chl a depletion. The water column was almost permanently stratified, and concentrations of chl awere higher outside of the culture unit and autocorrelated within the unit by vertical and horizontal dimensions. Depletion of chl a within the culture unit during a focused sampling campaign period was negatively correlated with current velocity, greatest in the center of the unit (ca. 60{\%} of ambient chl a concentrations) and lowest at the unit borders. Depletion was observed at the micro-scale within the boundary layer around the mussel aggregates, corresponding to a depletion gradient from the mussel aggregate surface of 0.074 µg l−1 cm−1. Shell length increment ranged between 0.04 and 0.29 mm d−1 and specific growth rate ranged between 0 and 4.6{\%} of dry weight d−1. A simple model was applied to evaluate scenarios of alternate farm configurations and fit to measured depletion. Model runs showed that the angle of incoming flow is important in a low-current regime (i.e. <10 cm s−1), and orientating the culture unit in line with predominant current directions would allow for enhanced reduction of chl a.",
keywords = "Mussel cultivation, Eutrophication, Mitigation, Mytilus edulis, Chlorophyll depletio",
author = "Petersen, {Jens Kjerulf} and Lars-Ove Loo and Daniel Taylor",
year = "2019",
doi = "10.3354/aei00312",
language = "English",
volume = "11",
pages = "263--278",
journal = "Aquaculture Environment Interactions",
issn = "1869-215X",
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}

Evaluating chlorophyll depletion in mitigation mussel cultivation at multiple scales. / Petersen, Jens Kjerulf; Loo, Lars-Ove; Taylor, Daniel.

In: Aquaculture Environment Interactions, Vol. 11, 2019, p. 263-278.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Evaluating chlorophyll depletion in mitigation mussel cultivation at multiple scales

AU - Petersen, Jens Kjerulf

AU - Loo, Lars-Ove

AU - Taylor, Daniel

PY - 2019

Y1 - 2019

N2 - Implementation of mussel culture for mitigating nutrient enrichment of coastal waters aims to optimize growth of mussels at production carrying capacity for maximum nutrient extraction. Simplified approaches for describing reductions in chlorophyll concentrations for the strategic deployment of mitigation units with regards to limited space and biophysical conditions can facilitate the proliferation of mitigation culture as a tool. Here we report data on measured chl a depletion at different scales in and around a mussel culture unit in western Sweden. A monitoring program was set up for a production period of 15 mo to characterize patterns of chl a depletion. The water column was almost permanently stratified, and concentrations of chl awere higher outside of the culture unit and autocorrelated within the unit by vertical and horizontal dimensions. Depletion of chl a within the culture unit during a focused sampling campaign period was negatively correlated with current velocity, greatest in the center of the unit (ca. 60% of ambient chl a concentrations) and lowest at the unit borders. Depletion was observed at the micro-scale within the boundary layer around the mussel aggregates, corresponding to a depletion gradient from the mussel aggregate surface of 0.074 µg l−1 cm−1. Shell length increment ranged between 0.04 and 0.29 mm d−1 and specific growth rate ranged between 0 and 4.6% of dry weight d−1. A simple model was applied to evaluate scenarios of alternate farm configurations and fit to measured depletion. Model runs showed that the angle of incoming flow is important in a low-current regime (i.e. <10 cm s−1), and orientating the culture unit in line with predominant current directions would allow for enhanced reduction of chl a.

AB - Implementation of mussel culture for mitigating nutrient enrichment of coastal waters aims to optimize growth of mussels at production carrying capacity for maximum nutrient extraction. Simplified approaches for describing reductions in chlorophyll concentrations for the strategic deployment of mitigation units with regards to limited space and biophysical conditions can facilitate the proliferation of mitigation culture as a tool. Here we report data on measured chl a depletion at different scales in and around a mussel culture unit in western Sweden. A monitoring program was set up for a production period of 15 mo to characterize patterns of chl a depletion. The water column was almost permanently stratified, and concentrations of chl awere higher outside of the culture unit and autocorrelated within the unit by vertical and horizontal dimensions. Depletion of chl a within the culture unit during a focused sampling campaign period was negatively correlated with current velocity, greatest in the center of the unit (ca. 60% of ambient chl a concentrations) and lowest at the unit borders. Depletion was observed at the micro-scale within the boundary layer around the mussel aggregates, corresponding to a depletion gradient from the mussel aggregate surface of 0.074 µg l−1 cm−1. Shell length increment ranged between 0.04 and 0.29 mm d−1 and specific growth rate ranged between 0 and 4.6% of dry weight d−1. A simple model was applied to evaluate scenarios of alternate farm configurations and fit to measured depletion. Model runs showed that the angle of incoming flow is important in a low-current regime (i.e. <10 cm s−1), and orientating the culture unit in line with predominant current directions would allow for enhanced reduction of chl a.

KW - Mussel cultivation

KW - Eutrophication

KW - Mitigation

KW - Mytilus edulis

KW - Chlorophyll depletio

U2 - 10.3354/aei00312

DO - 10.3354/aei00312

M3 - Journal article

VL - 11

SP - 263

EP - 278

JO - Aquaculture Environment Interactions

JF - Aquaculture Environment Interactions

SN - 1869-215X

ER -