Carbon and nitrogen allocation strategy in Posidonia oceanica is altered by seawater acidification

Scartazza, Andrea; Moscatello, Stefano; Gavrichkova, Olga; Buia, María Cristina; Lauteri, Marco; Battistelli, Alberto; Lorenti, Maurizio; Garrard, Samantha L.; Calfapietra, Carlo; Brugnoli, Enrico

doi:10.1016/j.scitotenv.2017.06.084

Cited by 39 publications

(48 citation statements)

References 76 publications

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“…that exhibit insoluble carbohydrate concentrations lower than Table S1. 200 mg g -1 (McDermid & Stuercke 2003, Table 3). In P. oceanica, the high concentrations of insoluble carbohydrates might be linked to the predominance of cellulose, hemicellulose and lignin, a legacy of its terrestrial origin (Ott & Mauer 1977;Vitale & Chessa 1998;Coletti et al, 2013;Scartazza et al, 2017). These high concentrations also induce the high C/N ratios usually measured in P. oceanica (Pirc & Wollenweber 1988;Fourqurean et al, 2007;Scartazza et al, 2017).…”

Section: Functioning Of Posidonia Oceanica Shoots and Influence Of Thmentioning

confidence: 99%

“…In P. oceanica, the high concentrations of insoluble carbohydrates might be linked to the predominance of cellulose, hemicellulose and lignin, a legacy of its terrestrial origin (Ott & Mauer 1977;Vitale & Chessa 1998;Coletti et al, 2013;Scartazza et al, 2017). These high concentrations also induce the high C/N ratios usually measured in P. oceanica (Pirc & Wollenweber 1988;Fourqurean et al, 2007;Scartazza et al, 2017). In addition, %C, lignin and cellulose do not vary seasonally in all plant parts except senescent leaves and are not affected by environmental stress such as water acidification (Fourqurean et al, 2007;Scartazza et al, 2017).…”

Section: Functioning Of Posidonia Oceanica Shoots and Influence Of Thmentioning

confidence: 99%

“…Nevertheless, in most studies, C and N isotopic composition were measured in adult leaves only, and possibly for epibionts. Adult leaves predominate in the shoot and are thus a useful proxy (Scartazza et al, 2017), notably when the aim of the study is to assess the fate of shoot production. However, some leaf-type specific functioning, metabolism and phenology may be missed if only adult leaves are considered, as leaves of different ages and metabolisms coexist within the same shoot (Giraud 1979;Pergent et al, 1989;Boudouresque et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Previous results have demonstrated that several biochemical, metabolic or environmental factors affect the carbon isotopic ratio (hereafter referred as δ 13 C), such as growth rate, leaf thickness, inorganic C concentration in water, depth, light irradiance or pH (Cooper & DeNiro 1989;Lepoint et al, 2003;Fourqurean et al, 2007;Scartazza et al, 2017). Similarly, nitrogen isotopic ratio (hereafter δ 15 N) of marine primary producers is commonly used as a proxy of anthropic nitrogen releases (Costanzo et al, 2001;Vizzini & Mazzola 2004;Vizzini et al, 2005;Pérez et al, 2008;Lassauque et al, 2010;Vermeulen et al, 2011), but recent results indicated that δ 15 N could be used to track fluxes of matter within the shoot (Scartazza et al, 2017). Thus, isotopic differences between plant part types might be expected, since the physiology, metabolism and environmental context of the P. oceanica meadow change between plant-part types and seasons.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, one storage organ (rhizomes), and several leaf types were considered, so as to track the biochemical and isotopic changes associated with creation, growth, senescence and drift of leaves, and seasonal cycle of primary production. Earlier studies also demonstrated that biochemical composition differed between leaves (e. g. Pellegrini 1971;Augier et al, 1982;Pirc & Wollenweber 1988;Lawrence et al, 1989;Pirc 1989), and proposed that the biochemical variations might lead to isotopic differences (Lepoint et al, 2003;Vizzini et al, 2003), but no study combining the two approaches has been performed so far to verify this hypothesis (but see Scartazza et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Seasonal and plant-part isotopic and biochemical variation in Posidonia oceanica

et al. 2019

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Posidonia oceanica is an iconic and highly productive Mediterranean seagrass. As most studies have focused on the fate of its production, temporal and plant part-specific variations of isotopic composition and biochemical content were overlooked. Combined seasonal and plant-part stable isotope composition and biochemical concentrations were measured at the lower depth limit of a P. oceanica meadow (~ 25 meter depth), and explained on the basis of previous knowledge of the specific metabolic functioning of each part. The predominance of compounds with complex chemical structure was reflected by the high concentrations of insoluble carbohydrates, high C/N ratios and high δ 13 C values. Plant parts clustered in 3 groups with similar isotopic or biochemical features and metabolism: rhizomes and juvenile leaves, intermediate and adult leaves, senescent and drifting leaves. This result agrees with the vegetative phenology of the plant. The biochemical composition and the isotopic composition of the plant parts were consistent with previous knowledge regarding the photosynthetic activity and its seasonal variation. Correlations were found between N-linked descriptors (δ 15 N and protein content), and between δ 13 C and insoluble carbohydrate concentration. Epibiont values differed considerably from those of the leaf, as this community is taxonomically diverse and seasonally variable. Biochemical and isotopic composition measured confirmed that the current complex metabolism of P. oceanica results from adaptations to the specific features of life in a marine oligotrophic environment.

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Section: Functioning Of Posidonia Oceanica Shoots and Influence Of Thmentioning

confidence: 99%

Section: Functioning Of Posidonia Oceanica Shoots and Influence Of Thmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seasonal and plant-part isotopic and biochemical variation in Posidonia oceanica

et al. 2019

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Ocean acidification alters meiobenthic assemblage composition and organic matter degradation rates in seagrass sediments

Ravaglioli

Lardicci

Pusceddu

et al. 2019

Limnology & Oceanography

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Seagrass meadows are an important organic matter (OM) reservoir but, are currently being lost due to global and regional stressors. Yet, there is limited research investigating the cumulative impacts of anthropogenic stressors on the structure and functioning of seagrass benthic assemblages, key drivers of OM mineralization and burial. Here, using a 16‐month field experiment, we assessed how meiobenthic assemblages and extracellular enzymatic activities (as a proxy of OM degradation) in Posidonia oceanica sediments responded to ocean acidification (OA) and nutrient loadings, at CO2 vents. P. oceanica meadows were exposed to three nutrient levels (control, moderate, and high) at both ambient and low pH sites. OA altered meiobenthic assemblage structure, resulting in increased abundance of annelids and crustaceans, along with a decline in foraminifera. In addition, low pH enhanced OM degradation rates in seagrass sediments by enhancing extracellular enzymatic activities, potentially decreasing the sediment carbon storage capacity of seagrasses. Nutrient enrichment had no effect on the response variables analyzed, suggesting that, under nutrient concentration unlikely to cause N or P imitation, a moderate increase of dissolved nutrients in the water column had limited influence on meiobenthic assemblages. These findings show that OA can significantly alter meiobenthic assemblage structure and enhance OM degradation rates in seagrass sediments. As meiofauna are ubiquitous key actors in the functioning of benthic ecosystems, we postulated that OA, altering the structure of meiobenthic assemblages and OM degradation, could affect organic carbon sequestration over large spatial scales.

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YOUMARES 8 – Oceans Across Boundaries: Learning from each other

Kalita¹,

Uwe²,

Kuehne³

2018

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Carbon and nitrogen allocation strategy in Posidonia oceanica is altered by seawater acidification

Cited by 39 publications

References 76 publications

Seasonal and plant-part isotopic and biochemical variation in Posidonia oceanica

Seasonal and plant-part isotopic and biochemical variation in Posidonia oceanica

Ocean acidification alters meiobenthic assemblage composition and organic matter degradation rates in seagrass sediments

YOUMARES 8 – Oceans Across Boundaries: Learning from each other

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