Functional resilience of PSII, vertical distribution and ecosystem-level estimates of subsurface microphytobenthos in estuarine tidal flats

Frankenbach, Silja; Azevedo, Ana; Reis, Vanessa; Dias, Diana; Vaz, Leandro; Dias, João Miguel; Serôdio, João

doi:10.1016/j.csr.2019.05.018

Cited by 12 publications

(9 citation statements)

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“…Three sampling sites were selected, based on their contrasting characteristics, namely location (channels, distance to the ocean), hydrodynamics, salinity and sediment granulometry (Figure 1): Gafanha da Encarnação, located in the Mira channel and closest to the mouth of the estuary, characterized by sandy sediments (GE; 40 • 35 18 N, 08 • 41 06 W); Vista Alegre, located in the Canal de Ílhavo, characterized by fine muddy sediments (VA; 40 • 37 12 N, 08 • 44 54 W); Torreira, in the S. Jacinto channel, characterized by coarser muddy sand (TO;40.758403 N,8.676949 W). The three sampling sites are described in more detail in Frankenbach et al (2019).…”

Section: Study Area Sampling and Sample Processingmentioning

confidence: 99%

“…The former was estimated from the mean value between the area covered by water during mean high tide and during mean low tide (89.2 and 64.9 km 2 , respectively; Lopes et al, 2013). The areas corresponding to each type of sediment type were the ones determined in Frankenbach et al (2019): 34, 16 and 5 km 2 for TO, GE and VA, respectively. The area corresponding to the phytoplankton was estimated to reach 100 km 2 , by adding the subtidal and the total intertidal areas calculated by Frankenbach et al (2019).…”

Section: Estimation Of Ecosystem-level Annual Primary Productivitymentioning

confidence: 99%

“…The areas corresponding to each type of sediment type were the ones determined in Frankenbach et al (2019): 34, 16 and 5 km 2 for TO, GE and VA, respectively. The area corresponding to the phytoplankton was estimated to reach 100 km 2 , by adding the subtidal and the total intertidal areas calculated by Frankenbach et al (2019).…”

Section: Estimation Of Ecosystem-level Annual Primary Productivitymentioning

confidence: 99%

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Synoptic Spatio-Temporal Variability of the Photosynthetic Productivity of Microphytobenthos and Phytoplankton in a Tidal Estuary

et al. 2020

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Tidal estuaries are regarded as highly important ecosystems, mostly due to their high primary productivity and associated role as carbon sinks. In these ecosystems, primary productivity is mainly due to the photosynthetic carbon fixation by phytoplankton and microphytobenthos. The productivity of the two communities has been mostly studied separately, and directly comparable estimates of their carbon fixation rates in the same estuary are relatively scarce. The present study aimed to characterize the spatiotemporal variability of the productivity of phytoplankton and microphytobenthos in a tidal estuary, the Ria de Aveiro (Portugal). The productivity of the two communities was determined using a common methodological approach, based on measurements of in vivo chlorophyll fluorescence, allowing the estimation of the annual ecosystemlevel budget for carbon fixation by the two groups. Productivity rates were determined based on synoptic in situ measurements of absolute rates of electron transport rate of photosystem II, using Pulse Amplitude Modulation fluorometry. Chlorophyll fluorescence indices were accompanied by measurements of salinity, temperature, water turbidity, solar irradiance, and planktonic and benthic microalgal biomass. Measurements were carried out hourly, along four spring-neap tidal cycles distributed along 1 year, on three sites of the estuary. The most pronounced trends in the spatio-temporal variability of the photophysiology and productivity of the two communities were the following: (i) maximum biomass and productivity were reached later for microphytobenthos (summerautumn) than for phytoplankton (spring-summer); (ii) the absorption cross-section of PSII was generally higher for phytoplankton; (iii) the two groups showed a similar photoacclimation state, but microphytobenthos appeared as high light-acclimated when compared to phytoplankton. Biomass-specific productivity was on average higher for phytoplankton than for microphytobenthos, averaging 68.0 and 19.1 mg C mg Chl a −1 d −1 , respectively. However, areal depth-integrated production rates were generally higher for the microphytobenthos than for the phytoplankton, averaging 264.5 and

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Section: Study Area Sampling and Sample Processingmentioning

confidence: 99%

Section: Estimation Of Ecosystem-level Annual Primary Productivitymentioning

confidence: 99%

Section: Estimation Of Ecosystem-level Annual Primary Productivitymentioning

confidence: 99%

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Synoptic Spatio-Temporal Variability of the Photosynthetic Productivity of Microphytobenthos and Phytoplankton in a Tidal Estuary

et al. 2020

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“…In fact, phytochromes can mediate the responses of plants to very low light intensities (e.g., "Very Low Fluence Responses" in seed germination; Sheerin and Hiltbrunner, 2017). Concerning motile diatoms, such responses would have a clear adaptive value in helping cells buried in ill-illuminated sediment layers (due to resuspension or bioturbation; Frankenbach et al, 2019) to reach the surface and regain photosynthetic activity and growth.…”

Section: Microphytobenthos and Light Environmentmentioning

confidence: 99%

Artificial Light at Night: A New Challenge in Microphytobenthos Research

Maggi

Serôdio

2020

Front. Mar. Sci.

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Artificial light at night (ALAN) has been recently recognized as a globally widespread anthropogenic disturbance, characterized by different intensities and spectra, as well as spatial and temporal variability. Among marine organisms, those living on coastal areas are particularly exposed to artificial light. Some recent studies anticipated a potential for influences of ALAN on microphytobenthos (MPB) on rocky shores, either direct or indirectly mediated by trophic relationships. Here we emphasize the need for further investigations in different habitats, as well as on synergistic interferences with other stressors already impinging on coastal areas. The study of effects of ALAN poses new challenges in MPB research, including those related to the use of instruments for measuring both the light environment and the functioning of microbial photoautotrophs at night, and to the development of common monitoring approaches and manipulative experiments.

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“…They are typically the dominant group in the microphytobenthos, the highly productive biofilm-forming communities of microalgae and cyanobacteria that colonize intertidal flats or shallow subtidal sediments (Underwood and Kromkamp 1999). Their ubiquity in virtually all marine habitats (Mock and Medlin 2012) and ability to strive in extreme habitats, such as polar systems (Lyon and Mock 2014) or under prolonged darkness (Frankenbach et al 2019;Kennedy et al 2019), is believed to be based on their unique physiological and metabolic features (Wilhelm et al 2006;Gruber and Kroth 2017).…”

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confidence: 99%

Diatoms and Their Ecological Importance

Serôdio

Lavaud

2020

Encyclopedia of the UN Sustainable Development Goals

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Diatoms are unicellular or colonial photoautotrophic microalgae, eukaryotic organisms classified as protists of the group of the Bacillariophyta. They are characterized by the unique feature of possessing a cell wall made of silica. Diatoms form an extremely diverse and evolutionarily successful group. They are found in all marine and freshwater habitats and in moist terrestrial habitats, being the most diverse group of algae, the number of species being estimated to reach between 100,000 (Mann and Vanormelingen 2013) and 200,000 (Armbrust 2009). Diatoms have an enormous ecological importance, contributing to 20-25% of the Earth's global primary production (Field et al. 1998;Sarthou et al. 2005). Their photosynthetic activity accounts for 40% of the marine primary production, being comparable to the total amount fixed by all the terrestrial rain forest combined (Armbrust 2009). However, their critical role in the functioning and biodiversity of oceanic and coastal zones, while representing a major carbon sink and supporting important marine food webs, is threatened by ongoing climate change, namely by ocean acidification and eutrophication.

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Functional resilience of PSII, vertical distribution and ecosystem-level estimates of subsurface microphytobenthos in estuarine tidal flats

Cited by 12 publications

References 103 publications

Synoptic Spatio-Temporal Variability of the Photosynthetic Productivity of Microphytobenthos and Phytoplankton in a Tidal Estuary

Synoptic Spatio-Temporal Variability of the Photosynthetic Productivity of Microphytobenthos and Phytoplankton in a Tidal Estuary

Artificial Light at Night: A New Challenge in Microphytobenthos Research

Diatoms and Their Ecological Importance

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