Measuring seagrass photosynthesis: methods and applications

Silva, João; Sharon, Yoni; Santos, Rui; Beer, Sven

doi:10.3354/ab00173

Cited by 38 publications

(26 citation statements)

References 142 publications

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“…The concept was based on a belief to the ability of the three important marine ecosystems i.e. mangrove, seagrass and salt marsh, in maintaining the balance of absorption and reduction of carbon emission (Nellemann et al, 2009;Silva et al, 2009). As one of coastal ecosystem components, the existence of seagrass ecosystem is important for carbon cycle in this zone (Kennedy et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Carbon Stock of Seagrass Community in Barranglompo Island, Makassar (Stok Karbon pada Komunitas Lamun di Pulau Barranglompo, Makassar)

et al. 2014

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Section: Introductionmentioning

confidence: 99%

Carbon Stock of Seagrass Community in Barranglompo Island, Makassar (Stok Karbon pada Komunitas Lamun di Pulau Barranglompo, Makassar)

et al. 2014

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“…Photosynthetic processes in seagrass can indeed be measured and detected by fluorometers and light reflectance devices, as discussed in more detail by Silva et al (2009).…”

Section: Discussionmentioning

confidence: 99%

Hyperspectral Reflectance Response of Seagrass (Enhalus acoroides) and Brown Algae (Sargassum sp.) to Nutrient Enrichment at Laboratory Scale

Suwandana

Kawamura

Sakuno

et al. 2012

Journal of Coastal Research

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“…Local acclimatization to in situ temperature and salinity can also impact photosynthetic rates via osmotic stress and changes in the photosynthesisrespiration ratio (Kenneth and Short, 2006 and references therein). In addition, our study examined photosynthetic rates by measuring the change in TCO 2 , which to our knowledge, has not been done before in the lab and rarely done in the field despite the robustness of the method (Silva et al, 2009). The photosynthetic quotient (O 2 /CO 2 ), while assumed to be unity or close to in many studies, is based on community metabolism in seagrass beds or meadows (Oviatt et al, 1986;Leuschner and Rees, 1993;Mateo et al, 2001;Martin et al, 2005).…”

Section: Species-specific Photosynthetic Ratesmentioning

confidence: 99%

Moderate Increase in TCO2 Enhances Photosynthesis of Seagrass Zostera japonica, but Not Zostera marina: Implications for Acidification Mitigation

2017

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Photosynthesis and respiration are vital biological processes that shape the diurnal variability of carbonate chemistry in nearshore waters, presumably ameliorating (daytime) or exacerbating (nighttime) short-term acidification events, which are expected to increase in severity with ocean acidification (OA). Biogenic habitats such as seagrass beds have the capacity to reduce CO 2 concentration and potentially provide refugia from OA. Further, some seagrasses have been shown to increase their photosynthetic rate in response to enriched total CO 2 (TCO 2 ). Therefore, the ability of seagrass to mitigate OA may increase as concentrations of TCO 2 increase. In this study, we exposed native Zostera marina and non-native Zostera japonica seagrasses from Padilla Bay, WA (USA) to various levels of irradiance and TCO 2 . Our results indicate that the average maximum net photosynthetic rate (P max ) for Z. japonica as a function of irradiance and TCO 2 was 3x greater than Z. marina when standardized to chlorophyll (360 ± 33 µmol TCO 2 mg chl −1 h −1 and 113 ± 10 µmol TCO 2 mg chl −1 h −1 , respectively). Additionally, Z. japonica increased its P max ∼50% when TCO 2 increased from ∼1,770 to 2,051 µmol TCO 2 kg −1 . In contrast, Z. marina did not display an increase in P max with higher TCO 2 , possibly due to the variance of photosynthetic rates at saturating irradiance within TCO 2 treatments (coefficient of variation: 30-60%) relative to the range of TCO 2 tested. Our results suggest that Z. japonica can affect the OA mitigation potential of seagrass beds, and its contribution may increase relative to Z. marina as oceanic TCO 2 rises. Further, we extended our empirical results to incorporate various biomass to water volume ratios in order to conceptualize how these additional attributes affect changes in carbonate chemistry. Estimates show that the change in TCO 2 via photosynthetic carbon uptake as modeled in this study can produce positive diurnal changes in pH and aragonite saturation state that are on the same order of magnitude as those estimated for whole seagrass systems. Based on our results, we predict that seagrasses Z. marina and Z. japonica both have the potential to produce short-term changes in carbonate chemistry, thus offsetting anthropogenic acidification when irradiance is saturating.

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Measuring seagrass photosynthesis: methods and applications

Cited by 38 publications

References 142 publications

Carbon Stock of Seagrass Community in Barranglompo Island, Makassar (Stok Karbon pada Komunitas Lamun di Pulau Barranglompo, Makassar)

Carbon Stock of Seagrass Community in Barranglompo Island, Makassar (Stok Karbon pada Komunitas Lamun di Pulau Barranglompo, Makassar)

Hyperspectral Reflectance Response of Seagrass (Enhalus acoroides) and Brown Algae (Sargassum sp.) to Nutrient Enrichment at Laboratory Scale

Moderate Increase in TCO2 Enhances Photosynthesis of Seagrass Zostera japonica, but Not Zostera marina: Implications for Acidification Mitigation

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