Effects of organic matter input from a fish farming facility on a Posidonia oceanica meadow

Cancemi, Gianluigi; Falco, Giovanni De; Pergent, Gérard

doi:10.1016/s0272-7714(02)00295-0

Cited by 118 publications

(78 citation statements)

References 26 publications

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“…NH 4 concentrations were always higher than NO 3 concentrations. The concentrations measured in Revellata Bay were in the same range as those measured by Cancemi et al (2000) at another site of the western Corsican coast, but much lower than pore water concentrations at other coastal sites of the NW Mediterranean (e.g. Lopez et al 1995 Pore water measurements were done by S. Gobert et al (unpubl.…”

Section: Nutrient Concentrationssupporting

confidence: 57%

Annual nitrogen budget of the seagrass Posidonia oceanica as determined by in situ uptake experiments

Lepoint

Millet²,

Dauby

et al. 2002

Mar. Ecol. Prog. Ser.

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The uptake of nitrate and ammonium by the roots and leaves of Posidonia oceanica were determined between February 1997 and June 1999 by in situ experiments using the isotope 15 of nitrogen ( 15 N) as a tracer in a nutrient-poor coastal zone of the NW Mediterranean Sea (Revellata Bay, Corsica). Nitrate and ammonium leaf uptakes are recorded at 0.05 and 0.1 µM respectively. The high variability observed cannot be explained solely by the variation of the substrate concentrations in the water column. For leaves, mean specific uptake rates were 47 ± 45 and 43 ± 64 µg N g N -1 h -1 . Nitrate and ammonium leaf uptake fluxes (g N m -2 yr -1 ) seem to have the same importance on an annual basis. Nitrate uptake occurs mainly in winter and early spring, when nitrate concentrations in the water column are highest. The uptake of N, and mainly of ammonium, is significant throughout the year with maxima at the beginning of spring, but it is insufficient to meet the annual N requirement of the plant. Posidonia root biomass was very high and corresponded to high specific N uptake rates by the roots. Ammonium was incorporated by the roots 6 times faster than nitrate. In the sediment, this uptake capacity is limited by the nutrient diffusion rate, and the root uptake is therefore insufficient to meet the N requirements of the plant. In fact, P. oceanica of Revellata Bay have a complex N budget involving uptake and recycling processes and allowing the plants to meet their N requirements in one of the most nutrient-poor areas of the NW Mediterranean Sea. We calculated that leaf and root would contribute to 40 and 60% of the annual N uptake, respectively, and 60% of the annual N requirement of the plant.KEY WORDS: Seagrass · Nitrogen uptake · 15 N tracer · NW MediterraneanResale or republication not permitted without written consent of the publisher

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Section: Nutrient Concentrationssupporting

confidence: 57%

Annual nitrogen budget of the seagrass Posidonia oceanica as determined by in situ uptake experiments

Lepoint

Millet²,

Dauby

et al. 2002

Mar. Ecol. Prog. Ser.

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“…Nutrients absorption of seagrass roots may impact on uptake of seagrass leaves to nitrogen Harlin, 1982, 1984). Also epiphyte overgrowth due to additive sediment-nutrient and organic matter loading may hinder N uptake by seagrass leaves, therefore decrease N uptake of seagrass leaves Balata et al, 2010;Cancemi et al, 2003;Delgado et al, 1999), although we did not observe epiphytes in this study.…”

Section: Negative Effects Of Elevated Organic Matter On Individual Ancontrasting

confidence: 66%

Individual and population indicators of Zostera japonica respond quickly to experimental addition of sediment-nutrient and organic matter

Han

Soissons

Chen

et al. 2017

Marine Pollution Bulletin

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“…Just over 93% of the seabream produced along the Spanish Mediterranean and Atlantic coasts comes from offshore cages, which are exposed to storms and strong hydrodynamic conditions. These facilities are located on detrital bottoms, at a depth of 30-50 m and away from sensitive habitats, such as those of Posidonia oceanica meadows and maerl beds [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Life Cycle Assessment of Gilthead Seabream (Sparus aurata) Production in Offshore Fish Farms

Garcı́a¹,

Jiménez

Aguado‐Giménez

et al. 2016

Sustainability

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Abstract:Life cycle assessment is used in this study to evaluate the potential environmental impacts of producing gilthead seabream in an offshore sea farm exposed to storms in the Spanish Mediterranean Sea. The farming methods used can be considered as "basic" since no centralized or automatic food distribution system exists and there is no control system. This study aims to identify the main hotspots under these conditions and to propose and compare viable alternatives to them. Contribution analysis found that the component of the system with the greatest potential environmental impact (48% of the overall impact) was fish feed, especially the raw material used. Other contributory factors were the fuel consumed by the vessels operating in the farm (35%), the dumping of N and P in the environment due to the metabolism of the fish (12%), the cages and their anchorage system (5%). A sensitivity analysis showed that a significant reduction in potential environmental impact can be achieved by increasing feeding efficiency. Feed formulation in raw materials is also an important factor and could serve to diminish overall adverse effects. A balance needs to be found between productive performance (growth, survival and feed conversion rate), feed price and its influence on production costs and the overall environmental consequences.

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Effects of organic matter input from a fish farming facility on a Posidonia oceanica meadow

Cited by 118 publications

References 26 publications

Annual nitrogen budget of the seagrass Posidonia oceanica as determined by in situ uptake experiments

Annual nitrogen budget of the seagrass Posidonia oceanica as determined by in situ uptake experiments

Individual and population indicators of Zostera japonica respond quickly to experimental addition of sediment-nutrient and organic matter

Life Cycle Assessment of Gilthead Seabream (Sparus aurata) Production in Offshore Fish Farms

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