Nitrogen and phosphorus ecophysiology of coralline algae

Nguyen, Hang T. T.; Pritchard, Daniel W.; Hepburn, Christopher D.

doi:10.1007/s10811-019-02019-w

Cited by 8 publications

(4 citation statements)

References 77 publications

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“…Wastewater from land-operated fish farms accounts for up to 95% of the seawater ammonium (Kwon et al, 2022), increasing coastal DIN and DIP concentrations (Choi et al, 2021), and generally contributes significantly to the nitrogen budget in the coastal waters of Jeju (Koh et al, 2013;Kim et al, 2022b). Sea water enriched in ammonium is preferred by coralline algae, which dominate SH (Nguyen et al, 2020;Kwon et al, 2022). Moreover, geniculate coralline algae have lower nitrogen amounts in their tissue than brown algae (e.g., E. cava, U. pinnatifida), hence incorporating less total nitrogen (Choi et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Environmental impact on marginal coastal benthic communities within the Jeju Island, South Korea temperate transition zone

Perrois,

Jöst,

Lee

et al. 2024

Front. Mar. Sci.

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Aim of studyMarine climatic transition zones are boundary areas of major climate zones, here the boundary between the subtropical and temperate zones. They present areas containing high abundance of organisms living at the limit of their physiological tolerance. These marginal populations are particularly sensitive to changes in their environment. As such, marine climatic transition zones are excellent natural playgrounds for climate change-related hypothesis testing, especially with respect to marine habitat response to ocean warming. The marginal biogenic habitats around Jeju Island, South Korea, which lies within the temperate transition zone, have gradually changed from macroalgal-dominated to hard coral-dominated habitats. Understanding the specific abiotic environmental factors that influence the distribution of the marginal populations in temperate transition zones (i.e., species at their occurrence limit) is crucial to predicting and managing temperate zone habitat changes caused by climate change. This study aims to identify the specific abiotic environmental factors that contribute to explaining the current spatial distribution of the declining temperate and expanding subtropical foundation species in Jeju waters.MethodsCoverage and composition of sessile benthic communities were determined by photo-quadrat analysis at two depths (10 m and 15 m) at three sites along the island’s south, east, and north coasts in May and November 2022. Divergences in community composition between sites were characterized in light of ten quantitative environmental parameters.ResultsOur results show that sessile foundation communities vary significantly at different sites around the island. While the south is defined by high-latitude hard corals, predominately Alveopora japonica, the east is defined by the temperate canopy-forming macroalga Ecklonia cava, and the north is characterized by coralline algae. Winter sea surface temperature, water transparency, nutrient concentration, and water movement were statistically the most impactful environmental factors determining which foundation species constitute each distinct benthic community.ConclusionThis study provides valuable baseline information on the impacts of abiotic environmental factors on marine sessile communities in a temperate transition zone.

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Section: Discussionmentioning

confidence: 99%

Environmental impact on marginal coastal benthic communities within the Jeju Island, South Korea temperate transition zone

Perrois,

Jöst,

Lee

et al. 2024

Front. Mar. Sci.

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“…Conversely, for Phymatolithopsis, I assume that it increased its use of NO3under most conditions and thus lost energy. However, NO3is taken up by diffusion (no energetic cost), while uptake of NH4 + is active or diffusion is facilitated (higher energetic cost) in some coralline algae (Roleda and Hurd 2019;Nguyen et al 2020). Therefore, it is possible that Phymatolithopsis saves energy by using more NO3that is more expensive to assimilate but less expensive to acquire.…”

Section: Discussionmentioning

confidence: 99%

“…Briefly, reductions in irradiance typically cause decreased photosynthetic rate (Martin et al 2013a), increased pigment content (Algarra and Xavier Niell 1990), decreased HCO3uptake (i.e. CCM downregulation) (Diaz-Pulido et al 2016), reduced nutrient uptake (e.g., nitrate) (Nguyen et al 2020) and slower growth/calcification (Chisholm 2000). Logically, increases in irradiance therefore generally elicit the opposite responses.…”

Section: Alteration Of the Underwater Light Environmentmentioning

confidence: 99%

“…This is an issue that also applies to other nutrients such as phosphorus. Nguyen et al (2020) provided important information in this regard by examining the phosphorus and nitrogen uptake strategies in two coralline algal species with differing morphologies. Notwithstanding, more research is urgently needed that addresses the role of nutrients in calcification of coralline algae (but see Johnson and Carpenter 2018), as nutrient uptake and supply modulate responses to environmental change in marine photoautotrophs (Flynn et al 2015;Celis-Pla et al 2015;Gao et al 2018).…”

Section: Outlook and Future Directionmentioning

confidence: 99%

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Physiologically Mediated Susceptibilties Of Coralline Algae To Ocean Change

Krieger¹

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Coralline algae are important foundation species in coastal ecosystems around the world but are threatened by ocean acidification (OA) and other anthropogenic stressors such as ocean warming (OW) and sedimentation. Physiological responses to ocean change are challenging to predict because the mechanisms that provide tolerance to different stressors are unknown and there is a lack of understanding of responses to multiple drivers. To address these issues, I conducted four experiments examining the physiological responses of multiple temperate coralline algal species to decreasing irradiance, declining pH, OW and marine heatwaves (MHWs), and a combination of OA, OW and reduced irradiance. Coralline algal calcification generally responded parabolically to irradiance, but photosynthesis responded linearly. My results suggest that light enhanced calcification is the result of increased ion pumping rates to elevate the calcium carbonate saturation state in the calcifying fluid (CF) and a higher daytime pH in the diffusion boundary layer that raises pHCF. My results implied the existence of two calcification strategies in coralline algae that I discuss within the thesis. Tolerance to OA was coupled to the species’ ability to maintain stable carbonate chemistry at the site of calcification to support calcification as seawater pH declined. Conversely, pronounced changes in internal calcium carbonate saturation state (ΩCF) and skeletal magnesium content were observed in the sensitive taxa. However, ΩCF did generally not decline but increase under OA. There was also slight OA-induced photodamage in sensitive taxa that could explain the inability to support ion-pumping and growth under OA. Photo-physiology and calcification of coralline algae were generally unaffected by OW and MHWs implying a high thermo-tolerance. However, exposure to future ocean conditions (decreased irradiance+OW x OA) caused the most severe reductions in calcification. Single driver (OA and decreased irradiance+OW) impacts were smaller. Calcification responses were decoupled from ΩCF likely due to the effective control over the internal carbonate chemistry. However, calcification likely declined due to the increased energy expenditure of calcification or when energy supply was reduced. Indeed, variations in energy expenditure and photosynthesis could explain most of the observed calcification responses. Overall, this thesis has increased our predictive understanding regarding the impact of ocean change on coralline algae by addressing several critical issues by providing a new mechanistic model that more accurately defines the role of irradiance in coralline algal calcification.

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Seasonal ammonium uptake kinetics of four brown macroalgae: Implications for use in integrated multi-trophic aquaculture

et al. 2022

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The combined culture of fed species (bivalves, fish) and macroalgae, known as integrated multi-trophic aquaculture (IMTA), has been suggested as a method of mitigating localised nitrogen (N) increase from aquaculture, whilst simultaneously culturing macroalgae for commercial applications. The development of IMTA requires an understanding of the N ecophysiology of candidate macroalga species. We examined seasonal variations in ammonium (NH4+) uptake kinetics, carbon to nitrogen (C:N) ratio, pigment content and soluble tissue N of four macroalgae of the phylum Ochrophyta, Ecklonia radiata, Macrocystis pyrifera, Lessonia corrugata, and Phyllospora comosa, from Tasmania, Australia. This study aimed to determine, (1) if the N physiology of the four macroalgal species was suitable for IMTA applications and (2) whether the species had seasonal variations in N ecophysiology which would influence their suitability for IMTA. Macrocystis pyrifera, L. corrugata, and E. radiata exhibited saturable NH4+ uptake kinetics, with a maximum uptake rate (Vmax) during spring, summer and autumn of 200, 45.8 and 45 μmol gDW-1 h-1 and half-saturation constants (Ks) of 361.3, 104.2 and 121 μM, respectively. Phyllospora comosa exhibited biphasic uptake patterns for three out of four months sampled. There were no noticeable seasonal patterns in pigment content or soluble tissue N for any species. C:N ratios increased from spring (October) to autumn (March) in both E. radiata (28.34 – 47.83) and P. comosa (24.99 – 51.62), indicating progressive N limitation though summer and into autumn. Results suggest that M. pyrifera and P. comosa are most suitable for IMTA due to their high NH4+ uptake potential.

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Nitrogen and phosphorus ecophysiology of coralline algae

Cited by 8 publications

References 77 publications

Environmental impact on marginal coastal benthic communities within the Jeju Island, South Korea temperate transition zone

Environmental impact on marginal coastal benthic communities within the Jeju Island, South Korea temperate transition zone

Physiologically Mediated Susceptibilties Of Coralline Algae To Ocean Change

Seasonal ammonium uptake kinetics of four brown macroalgae: Implications for use in integrated multi-trophic aquaculture

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