The relationship between seagrass (Posidonia oceanica) decline and sulfide porewater concentration in carbonate sediments

Calleja, María Ll.; Marbà, Núria; Duarte, Carlos M.

doi:10.1016/j.ecss.2007.02.016

Cited by 101 publications

(69 citation statements)

References 36 publications

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“…This statement is particularly observed for H 2 S measurements (Fig. 4) with higher concentrations recorded during the seasonal warm period (Calleja et al 2007;García-Martínez et al 2009;García et al 2012). …”

Section: Influence Of Seasonalitymentioning

confidence: 75%

Natural patches in Posidonia oceanica meadows: the seasonal biogeochemical pore water characteristics of two edge types

et al. 2017

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Section: Influence Of Seasonalitymentioning

confidence: 75%

Natural patches in Posidonia oceanica meadows: the seasonal biogeochemical pore water characteristics of two edge types

et al. 2017

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“…An increase in sulfide pools in the sediments along with a decrease in NCP has been shown in trop ical seagrass meadows (Gacia et al 2005, Calleja et al 2006, suggesting interference of sulfides in seagrass metabolism. Increasing sulfide pools in the sediment (Pérez et al 2007) and pore water (Calleja et al 2007), lead to seagrass decline (Borum et al 2005, Mascaró et al 2009). …”

Section: Discussionmentioning

confidence: 99%

“…Available studies show that excessive nutrient inputs are deposited beneath the cages (Sarà et al 2004, increasing the sediment (Apostolaki et al 2007) and the pore-water (Cancemi et al 2003) nutrient pools. Redox potential is usually decreased, while sulfate reduction rate is stimulated (Holmer et al 2003a), leading to an in crease of sulfide pools in both the sediment (Pérez et al 2007) and pore water (Calleja et al 2007). Sulfides can invade seagrass roots (Frederiksen et al 2008), inducing seagrass decline (Borum et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Reduced carbon sequestration in a Mediterranean seagrass (Posidonia oceanica) ecosystem impacted by fish farming

Apostolaki¹,

Holmer

Marbà³

et al. 2011

Aquacult. Environ. Interact.

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We studied the relationship between sediment nutrient enrichment and carbon sequestration, using the ratio of gross primary production to respiration (P/R), in a fishfarming impacted and an unaffected Mediterranean seagrass (Posidonia oceanica) ecosystem in the Aegean Sea, Greece. Carbon (C), nitrogen (N) and phosphorus (P) sedimentation, nutrient pools in sediment and dissolved nutrients in pore water were significantly and positively intercorrelated, indicating close linkage between sedimentation and sediment nutrient pools in seagrass meadows. C, N and P sediment pools were significantly enhanced in the impacted meadow throughout the year, even during winter when fish farming activity was low. In the impacted sediment, the increase in C and N was higher than P, reflecting a faster remineralization and uptake of P than C and N. The ecosystem P/R ratio decreased exponentially with sediment nutrient enrichment. Threshold values are given for C, N and P sedimentation rates and sediment pools, and for N and P concentrations in pore waters, after which P/R ratio in the seagrass meadow decreases below 1, indicating a shift from autotrophy to heterotrophy with sediment nutrient enrichment. Such a regime shift indicates a loss of storage capacity of the seagrass ecosystem, jeopardizing the key role of P. oceanica as a carbon sink in the Mediterranean.

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“…Sulfide is known to be very toxic to seagrasses (Calleja et al, 2007;Koch and Erskine, 2001;Lamers et al, 2013;Marba et al, 2006;Terrados et al, 1999) and Van der Heide et al (2012) showed a negative effect on Zostera noltii biomass production at porewater sulfide levels <200 mol L -1 . We found similar threshold values in our field experiment and also found that patch expansion was entirely blocked by sulfide concentrations >1000 mol L -1 .…”

Section: Sulfide Toxicitymentioning

confidence: 99%

Toxic effects of increased sediment nutrient and organic matter loading on the seagrass Zostera noltii

et al. 2014

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As a result of anthropogenic disturbances and natural stressors, seagrass beds are often patchy and heterogeneous. The effects of high loads of nutrients and organic matter in patch development and expansion in heterogeneous seagrass beds have, however, poorly been studied. We experimentally assessed the in situ effects of sediment quality on seagrass (Zostera noltii) patch dynamics by studying patch (0.35 m diameter) development and expansion for 4 sediment treatments: control, nutrient addition (NPK), organic matter addition (OM) and a combination (NPK+OM).OM addition strongly increased porewater sulfide concentrations whereas NPK increased porewater ammonium, nitrate and phosphate concentrations. As high nitrate concentrations suppressed sulfide production in NPK+OM, this treatment was biogeochemically comparable to NPK. Sulfide and ammonium concentrations differed within treatments, but over a 77 days period, seagrass patch survival and expansion were impaired by all additions compared to the control treatment.Expansion decreased at porewater ammonium concentrations >2000 mol L -1 .Mother patch biomass was not affected by high porewater ammonium concentrations as a result of its detoxification by higher seagrass densities. Sulfide 2 concentrations >1000 mol L -1 were toxic to both patch expansion and mother patch. We conclude that patch survival and expansion are constrained at high loads of nutrients or organic matter as a result of porewater ammonium or sulfide toxicity.

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The relationship between seagrass (Posidonia oceanica) decline and sulfide porewater concentration in carbonate sediments

Cited by 101 publications

References 36 publications

Natural patches in Posidonia oceanica meadows: the seasonal biogeochemical pore water characteristics of two edge types

Natural patches in Posidonia oceanica meadows: the seasonal biogeochemical pore water characteristics of two edge types

Reduced carbon sequestration in a Mediterranean seagrass (Posidonia oceanica) ecosystem impacted by fish farming

Toxic effects of increased sediment nutrient and organic matter loading on the seagrass Zostera noltii

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