Transient sediment load on blades of Arctic Saccharina latissima can mitigate UV radiation effect on photosynthesis

Roleda, Michael Y.; Dethleff, Dirk; Wiencke, Christian

doi:10.1007/s00300-008-0434-z

Cited by 25 publications

(21 citation statements)

References 17 publications

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“…While increased turbidity (Gordeev 2006) and ice scour are liable, at least at a decadal scale, to be damaging to macroalgae, the loss of sea ice will substantially increase the area available for the development of new meadows. Long-term increases of suspended matter in the area covered by macroalgae are liable to have a downstream influence on the diversity and productivity of other elements of the biota (Roleda et al 2008;Ronowicz et al 2011). …”

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confidence: 99%

“…During the Arctic summer, meltwater from snow and glaciers discharges substantial quantities of mineral matter into fjord systems (Zają czkowski 2002). This sediment reduces light availability and decreases the depth of the euphotic zone; it can also cover macroalgae, thereby decreasing their photosynthetic rate and hence productivity (Roleda et al 2008). Consequently, in the short-term, the overall algal biomass of Hornsund is likely to be reduced.…”

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confidence: 99%

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The sublittoral macroflora of Hornsund

2012

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Combined hydroacoustic, video and direct examination by scuba-diving of the underwater meadows of Hornsund, a flagship biodiversity site in Svalbard, revealed 17 species of macroalgae with a biomass, dominated by Laminariales, of as much as 3 kg m−2. The biomass dominants were Laminaria digitata and Saccharina latissima, which were most abundant at depths of between 5 and 10 m. The species data presented are the first records for the fjord and provide a starting point for new research and a baseline for future assessments of climate-induced changes

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confidence: 99%

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confidence: 99%

The sublittoral macroflora of Hornsund

2012

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“…Kiipli et al 2009) and ablationderived siltation in the high Arctic (cf. Roleda et al 2008) have also been observed to coat the thallus of Saccharina latissima (Figures 3b and c, respectively).…”

Section: Introductionmentioning

confidence: 85%

“…Samples were kept in darkness for 3 min and F v /F m was measured according to Roleda et al (2008). Sediment-covered discs were freed of particles before dark incubations.…”

Section: Pam-fluorometrymentioning

confidence: 99%

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Storm-generated sediment deposition on rocky shores: Simulating burial effects on the physiology and morphology ofSaccharina latissimasporophytes

Roleda

Dethleff

2011

Marine Biology Research

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Kelps inhabiting wave-exposed coasts are frequently exposed to disturbance such as storm-generated sediment deposition on blades which can be resuspended and removed by local hydrodynamic processes. However, in extreme cases, whole thalli can be buried under sediment for a period of time. The objectives of the present study are to determine the proximate effects of long-term sediment burial on kelp physiology and to confirm whether transient sediment load have functional significance in mitigating the negative effects of saturating light intensity normally encountered in the field. We simulated sediment burial to evaluate its impact on the vitality, in terms of photosystem II (PSII) function, pigments and morphology, of Saccharina latissima on different time scales. The effect was compared to the negative controls, kelps without sediment cover exposed to the whole radiation treatment. Results of our study showed that short-term burial under different sediment types (gravel, sand, and silt and clay) has no negative effect on the physiology and morphology of S. latissima, whereas sediment-free algal discs exposed to high PAR and UVR were bleached and photoinhibited. Conversely, long-term burial under silt and clay showed adverse smothering effect leading to bleaching, loss of PSII function and tissue decay. We observed that burial under gravel and sand (up to a period of 7 days), e.g. after storm slowdown and settlement of sediment particles, showed some protective function in mitigating the negative effect of photoinhibiting high light intensities naturally encountered by most intertidal and upper subtidal macroalgae.

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High‐latitude kelps and future oceans: A review of multiple stressor impacts in a changing world

Drakard

Hollarsmith

Stekoll

2023

Ecology and Evolution

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Kelp forests worldwide are threatened by both climate change and localized anthropogenic impacts. Species with cold-temperate, subpolar, or polar distributions are projected to experience range contractions over the coming decades, which may be exacerbated by climatic events such as marine heatwaves and increased freshwater and sediment input from rapidly contracting glaciers. The northeast Pacific has an extensive history of harvesting and cultivating kelps for subsistence, commercial, and other uses, and, therefore, declines in kelp abundance and distributional shifts will have significant impacts on this region. Gaps in our understanding of how coldtemperate kelp species respond to climate stressors have limited our ability to forecast the status of kelp forests in future oceans, which hampers conservation and management efforts. Here, we conducted a structured literature review to provide a synthesis of the impacts of multiple climate-related stressors on kelp forests in the northeast Pacific, assess existing knowledge gaps, and suggest potential research priorities. We chose to focus on temperature, salinity, sediment load, and light as the stressors most likely to vary and impact kelps as climate change progresses. Our results revealed biases in the existing literature toward studies investigating the impacts of temperature, or temperature in combination with light. Other stressors, particularly salinity and sediment load, have received much less focus despite rapidly changing conditions in high-latitude regions. Furthermore, multiple stressor studies appear to focus on kelp sporophytes, and it is necessary that we improve our understanding of how kelp microstages will be affected by stressor combinations. Finally, studies that investigate the potential of experimental transplantation or selective cultivation of genotypes resilient to environmental changes are lacking and would be useful for the conservation of wild populations and the seaweed aquaculture industry.

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Transient sediment load on blades of Arctic Saccharina latissima can mitigate UV radiation effect on photosynthesis

Cited by 25 publications

References 17 publications

The sublittoral macroflora of Hornsund

The sublittoral macroflora of Hornsund

Storm-generated sediment deposition on rocky shores: Simulating burial effects on the physiology and morphology ofSaccharina latissimasporophytes

High‐latitude kelps and future oceans: A review of multiple stressor impacts in a changing world

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