Deep-water Zostera marina meadows in the Mediterranean

Boutahar, Loubna; Espinosa, Free; Richir, Jonathan; Lepoint, Gilles; Gobert, Sylvie; Maanan, Mohamed; Bazairi, Hocein

doi:10.1016/j.aquabot.2020.103269

Cited by 7 publications

(3 citation statements)

References 96 publications

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“…The observed warming stimulation in seagrass productivity under lower irradiances can favor their capacity to colonize deeper areas (more than 4-6 m in Irish coasts), as warming enhances photosynthetic efficiency of temperaturelimited seagrass populations (Krause-Jensen et al, 2012;Krause-Jensen and Duarte, 2014). In agreement with this, warm-adapted Atlantic, Pacific and Mediterranean Z. marina populations can colonize depths of 10-20 m (Morita et al, 2007;Ondiviela et al, 2014;Boutahar et al, 2020), while the vertical distribution of central and northern Z. marina populations is restricted to 4-10 m (e.g., Phillips, 1974;Krause-Jensen et al, 2011;Beca-Carretero et al, 2020). It is noteworthy that other factors such as greater light penetration can also explain the colonization of deeper areas within its southern distribution range such as in Mediterranean regions.…”

Section: Effects Of Temperature Increases On Growth Performancementioning

confidence: 56%

Seasonal Acclimation Modulates the Impacts of Simulated Warming and Light Reduction on Temperate Seagrass Productivity and Biochemical Composition

et al. 2021

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Increases in seawater temperature and reduction in light quality have emerged as some of the most important threats to marine coastal communities including seagrass ecosystems. Temperate seagrasses, including Zostera marina, typically have pronounced seasonal cycles which modulate seagrass growth, physiology and reproductive effort. These marked temporal patterns can affect experimental seagrass responses to climate change effects depending on the seasons of the year in which the experiments are conducted. This study aimed at evaluating how seasonal acclimatization modulates productivity and biochemical responses of Zostera marina to experimental warming and irradiance reduction. Seagrass shoots were exposed to different temperatures (6, 12, 16, 20, and 24°C), combined with high (180 μmol photons m–2 s–1) and low (60 μmol photons m–2 s–1) light conditions across four seasons (spring: April, summer: July, and autumn: November 2015, and winter: January 2016). Plants exhibited similar temperature growth rates between 16 and 20°C; at 24°C, a drastic reduction in growth was observed; this was more accentuated in colder months and under low irradiance conditions. Higher leaf growth rates occurred in winter while the largest rhizomes were reached in experiments conducted in spring and summer. Increases in temperature induced a significant reduction in polyunsaturated fatty acids (PUFA), particularly omega-3 (n-3 PUFA). Our results highlight that temperate seagrass populations currently living under temperature limitation will be favored by future increases in sea surface temperature in terms of leaf and rhizome productivity. Together with results from this study on Z. marina from a temperate region, a wider review of the reported impacts of experimental warming indicates the likely reduction in some compounds of nutritional importance for higher trophic levels in seagrass leaves. Our results further demonstrate that data derived from laboratory-based studies investigating environmental stress on seagrass growth and acclimation, and their subsequent interpretation, are strongly influenced by seasonality and in situ conditions that precede any experimental exposure.

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Section: Effects Of Temperature Increases On Growth Performancementioning

confidence: 56%

Seasonal Acclimation Modulates the Impacts of Simulated Warming and Light Reduction on Temperate Seagrass Productivity and Biochemical Composition

et al. 2021

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“…Lal et al (2010) also found significantly lower seagrass cover in areas with higher densities of Chelonia mydas. The invasive seaweed Caulerpa cylindracea has been documented as a threat to seagrass (Boutahar et al 2020), especially on the Mediterranean coast of Morocco and Tunisia. In Jbel Moussa, Oued Mersa bay for example, the seaweed covered 19% of the area and was associated with seagrass mortality (Boutahar et al 2020).…”

Section: Drivers Of Change In Seagrass Covermentioning

confidence: 99%

“…Seagrasses are an important component of near-shore marine ecosystems and support diverse assemblages of flora and fauna across the globe. They are foundationstone species, providing structural complexity and primary production in many coastal food webs (Boutahar et al 2020;Green and Short 2003). They provide critical habitat and nursery grounds for about 20% of the world's largest fisheries (Unsworth et al 2019) and support the livelihoods of millions of people in coastal communities (Macreadie et al 2018;Short et al 2011).…”

Section: Introductionmentioning

confidence: 99%

A Review of Seagrass Cover, Status and Trends in Africa

Mwikamba,

Githaiga,

Briers

et al. 2024

Estuaries and Coasts

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The recognition of the benefits that seagrasses contribute has enhanced the research interest in these marine ecosystems. Seagrasses provide critical goods and services and support the livelihoods of millions of people. Despite this, they are declining around the globe. To conserve these ecosystems, it is necessary to understand their extent and the drivers leading to their loss. However, global seagrass cover estimates are highly uncertain and there are large regional data gaps, especially in the African continent. This work reviewed all available data on the extent of seagrass cover, evidence of changes in cover and drivers of this change in Africa, to inform management and conservation approaches across the continent and identify gaps in knowledge. Using a systematic review and expert consultation, 43 relevant articles were identified. Of the 41 African countries with a coastline, 27% had no data on seagrass cover. For 44%, data were available for some parts of their coastline, while 29% had data for their entire coastline. Quantitative information on trends in seagrass cover change was only available from three countries. The study identified 32 suggested drivers of seagrass cover loss, with impacts from fishing mentioned most frequently. Direct anthropogenic drivers accounted for 66.7% of the mentions, while climate and biologically induced drivers accounted for 22.7% and 10.6%, respectively. This study demonstrates the need for better estimates of seagrass extent, in at least 70% of relevant African nations, and major gaps in our understanding of the drivers of seagrass decline in Africa.

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Resource recovery and reduction of tidal waste to produce cellulose through sulphur-free pulping

Moral,

Greyer,

Aguado

et al. 2023

Cellulose

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The transition towards a sustainable cellulose industry needs more environmentally friendly technologies, including the use of lignocellulosic waste as alternative raw materials. This work shows the potential of dead biomass from the Andalusian Mediterranean coastline to obtain cellulosic pulp. With this purpose, predominant species in onshore residues (mainly Posidonia oceanica) were prepared, characterized, and subjected to a soda-anthraquinone pulping process. A central composite design was defined in order to relate the process conditions to the composition and characteristics of the cellulose pulp. It was concluded that polynomial models encompassing linear, quadratic, and binary effect parameters reproduce the experimental results satisfactorily. Results allowed to choose high anthraquinone dosage, alkali charge and temperature, low liquid/solid ratio and short time as a compromise solution, by which the brightness, ethanol–benzene extractives content, kappa number, lignin content and viscosity were near their optimal. Low values of liquid/solid ratio reduce water consumption, which is of utmost importance in cellulose industries likewise short time treatments to save energy.

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Deep-water Zostera marina meadows in the Mediterranean

Cited by 7 publications

References 96 publications

Seasonal Acclimation Modulates the Impacts of Simulated Warming and Light Reduction on Temperate Seagrass Productivity and Biochemical Composition

Seasonal Acclimation Modulates the Impacts of Simulated Warming and Light Reduction on Temperate Seagrass Productivity and Biochemical Composition

A Review of Seagrass Cover, Status and Trends in Africa

Resource recovery and reduction of tidal waste to produce cellulose through sulphur-free pulping

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