Biogeochemical effects of disturbance in shallow water sediment by macroalgae harvesting boats

Lenzi, Mauro; Finoia, María Grazia; Persia, Emma; Comandi, Sara; Gargiulo, Valentina; Solari, Duccio; Gennaro, Paola; Porrello, Salvatore

doi:10.1016/j.marpolbul.2004.11.038

Cited by 24 publications

(18 citation statements)

References 17 publications

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“…Indeed, frequent sediment resuspension has physical and geochemical effects on the sediment, such as changes in sediment texture, redox increase and oxidation of iron to ferric oxides (Golterman, 2001), as well as biological effects, such as an increase in oxydative mineralising strains of prokaryotes, leading to increased mineralization rate (Wainright, 1990), that can also involve neighbouring areas, following transport of resuspended matter (Logan and Kirchman, 1991). The end result is a decrease in sediment organic matter (Stahlberg et al, 2006;Lenzi et al, 2005Lenzi et al, , 2010. The ferric oxides-hydroxides bind orthophosphates (Golterman, 2001), that become depleted in interstitial water and above all in the water column, causing P-limitation, which is followed by a decrease in macroalgal development and a change in macroalgal quality (Lenzi et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…Hence resuspension of sediment may be used to remediate eutrophication and anoxic events in lagoons (Lenzi, 2010). Lenzi et al (2005Lenzi et al ( , 2010 conducted experiments to clarify the effects of resuspension on the water column, sediment and vegetation, with a view to using resuspension as a method to counteract the effects of eutrophication. These experiments did not show any negative effects of resuspension on physical and chemical parameters of the water column over a relatively long period of disturbance, and they showed a decrease in sediment organic load, variations in sediment density and porosity, a drastic reduction in macroalgal development and an increase in seagrass (with many seedlings establishing directly from seed).…”

Section: Introductionmentioning

confidence: 99%

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Effects of artificial disturbance on quantity and biochemical composition of organic matter in sediments of a coastal lagoon

Lenzi

Renzi

2011

Knowl. Managt. Aquatic Ecosyst.

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Key-words:eutrophication, sediment resuspension, lagoon management, organic matter characterization, anoxiaThe eutrophication of the coastal lagoon of Burano (Tuscany, Italy) produces periodic toxic-anoxic events. The possibility of mitigating eutrophication of a lagoon by resuspension of sediment was tested in a threeyear field experiment conducted in [2008][2009]. An unreplicated beforeafter control-impact (BACI) study design was used to ascertain variations in the quantity and biochemical composition of organic matter in sediment artificially disturbed by a specially equipped boat. In October 2008, before beginning disturbance, January 2009, half way through the disturbance period, and May 2009, at the end of disturbance, sediment was sampled in a disturbed area and an undisturbed control area to determine chlorophyll-a (Chl-a), phaeopigments (PHAE), proteins (PRT), carbohydrates (CHO), lipids (LIP), labile organic matter (LOM), refractory organic matter (ROM), total organic carbon (TOC) and total nitrogen (TN). The disturbed area, measuring 44 ha, was divided into nine subareas, eight of which were subjected to four different frequencies of disturbance (from 2 to 5) in the period October 2008 -April 2009. Sediment was sampled in each sub-area in the three months mentioned above to determine labile and total organic matter. The results were processed by univariate and multivariate analysis using Primer 6.0, Permanova + and Prism 5.0 software. The findings were as follows: (1) a large proportion of the biopolymeric carbon consisted of labile matter throughout the lagoon; (2) higher abatement of labile organic matter was recorded in the disturbed area; (3) a lower protein:carbohydrate ratio was found in the disturbed than in the undisturbed area; (4) the C:N ratio of sediment was much lower in the undisturbed area than in the disturbed area at the end of the study period; (5) sediment and macroalgal C:N ratios did not significantly change in response to disturbance; (6) initial accumulation of organic matter from phytoplankton was greater in the disturbed area than the undisturbed area; (7) chlorophyll-a, phaeopigments and the pigment diversity index did not reflect any decline in photosynthesis in the disturbed area; (8) treatment effects increased with increasing frequency of disturbance. These findings indicate less availability of labile organic matter and therefore lower risk of extended anoxic events in the disturbed area and support our hypothesis that artificial disturbance of sediment can be used to manage lagoon environments and prevent the consequences of eutrophication. L'eutrophisation des lagunes côtières de Burano (Italie) produit périodiquement des événements toxiques-anoxiques. Atténuer l'eutrophisation par remise en suspension des sédiments a été testé dans des expériences de terrain (2008)(2009)). Un protocole de type BACI a été utilisé pour vérifier les variations dans la composition biochimique de la matière organique dans les sédiments perturbés par un bateau spécial. Les sédimen...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of artificial disturbance on quantity and biochemical composition of organic matter in sediments of a coastal lagoon

Lenzi

Renzi

2011

Knowl. Managt. Aquatic Ecosyst.

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“…A frequent resuspension of anoxic sediments covered by the mat 1) blocks the activity of sulfate-reducing bacteria, likely because it carries the surficial sediments in areas where oxygen is present [27], 2) enriches the detritus of aerobic bacteria located in the water column, pushing for aerobic mineralization [47], 3) tends to favour the processes of nitrification/denitrification [48][49][50], 4) produces conditions for which the orthophosphates are blocked through bonds with the ferric oxy-hydroxides [42], creating phosphorus limitation for the mat, and, ultimately, 5) reduces the load of sediment labile organic matter (LOM) [51,26,27], bringing the sediment into "security conditions", for a short/medium duration, with respect to the onset of dystrophic phenomena. For a review, see Lenzi [52].…”

Section: Conceptual Models Of the High Density Macroalgal Mat Growth mentioning

confidence: 99%

“…For a review, see Lenzi [52]. Finally, Lenzi et al [26,27,28] did not observe a significant nutrients increase in the water column during the sediment resuspension activities.…”

Section: Conceptual Models Of the High Density Macroalgal Mat Growth mentioning

confidence: 99%

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Artificial Top Layer Sediment Resuspension To Counteract Chaetomorpha Linum (Muller) Kutz Blooms In A Eutrophic Lagoon. Three Years Full-Scale Experience

Lenzi¹

2017

JAMB

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This study analyzes the full-scale results of a three-year eutrophication control and management in the Orbetello lagoon. We examined the cause/effect relationship among the resuspension of top layer sediment in the water column (carried out by specifically designated boats), the labile organic matter present in the sediments (LOM), and the values of Chaetomorpha linum high density mats, which insist in the disturbed areas. LOM values resulted inversely associated to the frequency of sediment disturbance. LOM decrease, together with higher oxidation levels, triggered the reduction of nutrient release with an immediate effect on algal masses: the decay of the mat under layer prevailed on the growth of the mat over layer. Conversely, with a reduced frequency of disturbance, and the consequent increase of both the LOM as well as the anaerobic processes of the sediment which promote nutrient releases, the algal growth showed a time lag of several months, in which the nutrients uptake was likely intense. The stored nutrients were then used only some months later, when the environmental conditions became favorable for the surprisingly rapid and impressive development of the mats.

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Seasonal Fluctuations of Trace Elements from Different Habitats of Orbetello Lagoon (Thyrrenian Sea, Italy)

Renzi

Guerranti²

2017

Arch Environ Contam Toxicol

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This study evaluated seasonal fluctuations of trace elements of major ecotoxicological concern in sediments and their uptakes by the aquatic vegetation indifferent undisturbed habitats from the Orbetello lagoon, correlating measured levels to abiotic and biotic drivers to scale the significant of their effect on observed seasonal variability of trace elements. Results show that under natural undisturbed conditions, observed seasonal fluctuations in different habitats are statistically correlated to temperature, salinity, and turbidity of water and total nutrients in sediments. These variables and the habitat type dominated by macroalgae (C. linum) play a significant role as drivers of variability for measured trace elements in sediments. This study represents a reference undisturbed condition of natural seasonal trends of trace elements in different habitat types before the occurrence of numerous impacting activities on sediments and could represent a useful baseline for further management evaluations after the occurrence of sediment disturbance actions planned for the near future.

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Biogeochemical effects of disturbance in shallow water sediment by macroalgae harvesting boats

Cited by 24 publications

References 17 publications

Effects of artificial disturbance on quantity and biochemical composition of organic matter in sediments of a coastal lagoon

Effects of artificial disturbance on quantity and biochemical composition of organic matter in sediments of a coastal lagoon

Artificial Top Layer Sediment Resuspension To Counteract Chaetomorpha Linum (Muller) Kutz Blooms In A Eutrophic Lagoon. Three Years Full-Scale Experience

Seasonal Fluctuations of Trace Elements from Different Habitats of Orbetello Lagoon (Thyrrenian Sea, Italy)

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