Influence of mussel aquaculture on sediment organic enrichment in a nutrient-rich coastal embayment

B Hargrave, Lisa Doucette, P Cranford, B Law, T Milligan

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Effects of mussel Mytilus edulis aquaculture on benthic organic enrichment were determined in Tracadie Bay, a shallow, nutrient-rich embayment in Prince Edward Island, Canada. Water content (WC), inorganic grain size (GS), organic matter (OM), redox potentials (EhNHE) and free sulfides (S) in the upper 2 cm of sediment were measured at 58 stations throughout the inlet to evaluate spatial variations between lease and non-lease locations. MANOVA results showed that mean (±SD) values for WC (64.8 ± 12.7%), OM (9.8 ± 4.3%), and S (1794 ± 771 μM) were significantly (p <0.005) higher and EhNHE lower (-51 ± 78 mV) within mussel leases (n = 24) vs. non-lease areas (n = 34). Negative regressions between S and GS and positive regressions between EhNHE and GS at lease and non-lease locations had similar slopes but intercept values were significantly higher for S and lower for EhNHE (p <0.007) for lease locations. EhNHE and a Benthic Enrichment Index derived from EhNHE, OM and WC were inversely related to S. K- means clustering and multi-dimensional scaling showed that geochemical variables could be used to group stations into categories of benthic organic enrichment within mussel lease and non-lease areas characteristic of oxic-hypoxic sediments described by measures of S and EhNHE.
Original languageEnglish
Pages (from-to)137-149
Number of pages13
JournalMarine Ecology Progress Series
Volume365
DOIs
Publication statusPublished - 2008
Externally publishedYes

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aquaculture
mussels
organic matter
water content
sediments
nutrient
grain size
sediment
Prince Edward Island
redox potential
Mytilus edulis
sulfides
spatial variation
oxic sediment
Canada
nutrients
sulfide
lease
station
multidimensional scaling

Cite this

Hargrave, B ; Doucette, Lisa ; Cranford, P ; Law, B ; Milligan, T. / Influence of mussel aquaculture on sediment organic enrichment in a nutrient-rich coastal embayment. In: Marine Ecology Progress Series. 2008 ; Vol. 365. pp. 137-149.
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Influence of mussel aquaculture on sediment organic enrichment in a nutrient-rich coastal embayment. / Hargrave, B; Doucette, Lisa; Cranford, P; Law, B; Milligan, T.

In: Marine Ecology Progress Series, Vol. 365, 2008, p. 137-149.

Research output: Contribution to journalArticle

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T1 - Influence of mussel aquaculture on sediment organic enrichment in a nutrient-rich coastal embayment

AU - Hargrave, B

AU - Doucette, Lisa

AU - Cranford, P

AU - Law, B

AU - Milligan, T

PY - 2008

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AB - Effects of mussel Mytilus edulis aquaculture on benthic organic enrichment were determined in Tracadie Bay, a shallow, nutrient-rich embayment in Prince Edward Island, Canada. Water content (WC), inorganic grain size (GS), organic matter (OM), redox potentials (EhNHE) and free sulfides (S) in the upper 2 cm of sediment were measured at 58 stations throughout the inlet to evaluate spatial variations between lease and non-lease locations. MANOVA results showed that mean (±SD) values for WC (64.8 ± 12.7%), OM (9.8 ± 4.3%), and S (1794 ± 771 μM) were significantly (p <0.005) higher and EhNHE lower (-51 ± 78 mV) within mussel leases (n = 24) vs. non-lease areas (n = 34). Negative regressions between S and GS and positive regressions between EhNHE and GS at lease and non-lease locations had similar slopes but intercept values were significantly higher for S and lower for EhNHE (p <0.007) for lease locations. EhNHE and a Benthic Enrichment Index derived from EhNHE, OM and WC were inversely related to S. K- means clustering and multi-dimensional scaling showed that geochemical variables could be used to group stations into categories of benthic organic enrichment within mussel lease and non-lease areas characteristic of oxic-hypoxic sediments described by measures of S and EhNHE.

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KW - Redox potentials

KW - Hypoxic

KW - Anoxic

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KW - Mytilus edulis.

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