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Assessing the recovery of functional diversity after sustained sediment screening at an aggregate dredging site in the North Sea

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Assessing the recovery of functional diversity after sustained sediment screening at an aggregate dredging site in the North Sea. / Barrio Frojan, Christopher R.S.; Cooper, Keith M.; Bremner, Julie; Defew, Emma Clare; Wan Hussin, Wan Mohd Rauhan; Paterson, David Maxwell.

In: Estuarine, Coastal and Shelf Science, Vol. 92, No. 3, 05.2011, p. 358-366.

Research output: Contribution to journalArticle

Harvard

Barrio Frojan, CRS, Cooper, KM, Bremner, J, Defew, EC, Wan Hussin, WMR & Paterson, DM 2011, 'Assessing the recovery of functional diversity after sustained sediment screening at an aggregate dredging site in the North Sea' Estuarine, Coastal and Shelf Science, vol. 92, no. 3, pp. 358-366. https://doi.org/10.1016/j.ecss.2011.01.006

APA

Barrio Frojan, C. R. S., Cooper, K. M., Bremner, J., Defew, E. C., Wan Hussin, W. M. R., & Paterson, D. M. (2011). Assessing the recovery of functional diversity after sustained sediment screening at an aggregate dredging site in the North Sea. Estuarine, Coastal and Shelf Science, 92(3), 358-366. https://doi.org/10.1016/j.ecss.2011.01.006

Vancouver

Barrio Frojan CRS, Cooper KM, Bremner J, Defew EC, Wan Hussin WMR, Paterson DM. Assessing the recovery of functional diversity after sustained sediment screening at an aggregate dredging site in the North Sea. Estuarine, Coastal and Shelf Science. 2011 May;92(3):358-366. https://doi.org/10.1016/j.ecss.2011.01.006

Author

Barrio Frojan, Christopher R.S. ; Cooper, Keith M. ; Bremner, Julie ; Defew, Emma Clare ; Wan Hussin, Wan Mohd Rauhan ; Paterson, David Maxwell. / Assessing the recovery of functional diversity after sustained sediment screening at an aggregate dredging site in the North Sea. In: Estuarine, Coastal and Shelf Science. 2011 ; Vol. 92, No. 3. pp. 358-366.

Bibtex - Download

@article{c8eb1bf1dae34d2cb1bde0a380ab8883,
title = "Assessing the recovery of functional diversity after sustained sediment screening at an aggregate dredging site in the North Sea",
abstract = "The effects of dredging the seabed for aggregate on benthic functional diversity were assessed using a suite of suitable indices on a recovering macrofaunal assemblage. Recovery was assessed as the return of a dredged assemblage to a state found in neighbouring undisturbed (reference) sites. In situ sedimentscreening was permitted during dredging operations; a difference in the sedimentary profile of the seabed between dredged and undisturbed reference sites was also observed. At sites of relatively high and low dredging intensity the sediment appeared more homogenous than reference sites after the selective removal of the coarser component. Initial assessment of the macrofaunal assemblage using univariate analytical techniques suggested a recovery of functional diversity at the low dredging intensity site after two years (according to the Infaunal Trophic Index, Taxonomic Distinctness index and Rao’s Quadratic Entropy coefficient). However, multivariate analyses of the same data and of all indices except Taxonomic Distinctness indicated that assemblages at both high and low dredging intensity sites remained statistically indistinguishable from each other yet markedly different to the assemblage present in the reference area during the four-year study. The study concluded that recovery of functionaldiversity to a level found in a neighbouring undredged habitat had not occurred at either dredged site five years after the cessation of dredging. It is thought that the damage by dredging to functional diversity and to the capacity of the macrofaunal assemblage to recover is immediate and not so dependent on dredging intensity. The cumulative and wider ranging effects of sediment screening cannot be ignored or dismissed as a contributing factor to the similarities observed. The wider significance of these findings on the regulation of dredging activities is discussed.",
keywords = "functional diversity environmental assessment marine aggregate dredging recovery sediment screening",
author = "{Barrio Frojan}, {Christopher R.S.} and Cooper, {Keith M.} and Julie Bremner and Defew, {Emma Clare} and {Wan Hussin}, {Wan Mohd Rauhan} and Paterson, {David Maxwell}",
year = "2011",
month = "5",
doi = "10.1016/j.ecss.2011.01.006",
language = "English",
volume = "92",
pages = "358--366",
journal = "Estuarine, Coastal and Shelf Science",
issn = "0272-7714",
publisher = "ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD",
number = "3",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Assessing the recovery of functional diversity after sustained sediment screening at an aggregate dredging site in the North Sea

AU - Barrio Frojan, Christopher R.S.

AU - Cooper, Keith M.

AU - Bremner, Julie

AU - Defew, Emma Clare

AU - Wan Hussin, Wan Mohd Rauhan

AU - Paterson, David Maxwell

PY - 2011/5

Y1 - 2011/5

N2 - The effects of dredging the seabed for aggregate on benthic functional diversity were assessed using a suite of suitable indices on a recovering macrofaunal assemblage. Recovery was assessed as the return of a dredged assemblage to a state found in neighbouring undisturbed (reference) sites. In situ sedimentscreening was permitted during dredging operations; a difference in the sedimentary profile of the seabed between dredged and undisturbed reference sites was also observed. At sites of relatively high and low dredging intensity the sediment appeared more homogenous than reference sites after the selective removal of the coarser component. Initial assessment of the macrofaunal assemblage using univariate analytical techniques suggested a recovery of functional diversity at the low dredging intensity site after two years (according to the Infaunal Trophic Index, Taxonomic Distinctness index and Rao’s Quadratic Entropy coefficient). However, multivariate analyses of the same data and of all indices except Taxonomic Distinctness indicated that assemblages at both high and low dredging intensity sites remained statistically indistinguishable from each other yet markedly different to the assemblage present in the reference area during the four-year study. The study concluded that recovery of functionaldiversity to a level found in a neighbouring undredged habitat had not occurred at either dredged site five years after the cessation of dredging. It is thought that the damage by dredging to functional diversity and to the capacity of the macrofaunal assemblage to recover is immediate and not so dependent on dredging intensity. The cumulative and wider ranging effects of sediment screening cannot be ignored or dismissed as a contributing factor to the similarities observed. The wider significance of these findings on the regulation of dredging activities is discussed.

AB - The effects of dredging the seabed for aggregate on benthic functional diversity were assessed using a suite of suitable indices on a recovering macrofaunal assemblage. Recovery was assessed as the return of a dredged assemblage to a state found in neighbouring undisturbed (reference) sites. In situ sedimentscreening was permitted during dredging operations; a difference in the sedimentary profile of the seabed between dredged and undisturbed reference sites was also observed. At sites of relatively high and low dredging intensity the sediment appeared more homogenous than reference sites after the selective removal of the coarser component. Initial assessment of the macrofaunal assemblage using univariate analytical techniques suggested a recovery of functional diversity at the low dredging intensity site after two years (according to the Infaunal Trophic Index, Taxonomic Distinctness index and Rao’s Quadratic Entropy coefficient). However, multivariate analyses of the same data and of all indices except Taxonomic Distinctness indicated that assemblages at both high and low dredging intensity sites remained statistically indistinguishable from each other yet markedly different to the assemblage present in the reference area during the four-year study. The study concluded that recovery of functionaldiversity to a level found in a neighbouring undredged habitat had not occurred at either dredged site five years after the cessation of dredging. It is thought that the damage by dredging to functional diversity and to the capacity of the macrofaunal assemblage to recover is immediate and not so dependent on dredging intensity. The cumulative and wider ranging effects of sediment screening cannot be ignored or dismissed as a contributing factor to the similarities observed. The wider significance of these findings on the regulation of dredging activities is discussed.

KW - functional diversity environmental assessment marine aggregate dredging recovery sediment screening

U2 - 10.1016/j.ecss.2011.01.006

DO - 10.1016/j.ecss.2011.01.006

M3 - Article

VL - 92

SP - 358

EP - 366

JO - Estuarine, Coastal and Shelf Science

T2 - Estuarine, Coastal and Shelf Science

JF - Estuarine, Coastal and Shelf Science

SN - 0272-7714

IS - 3

ER -

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ID: 8006354