Heat wave impacts on the model diatom Phaeodactylum tricornutum: Searching for photochemical and fatty acid biomarkers of thermal stress

Feijão, Eduardo; Gameiro, Carla; Franzitta, Marco; Duarte, Bernardo; Caçador, Isabel; Cabrita, Maria Teresa; Matos, Ana Rita

doi:10.1016/j.ecolind.2017.07.058

Cited by 63 publications

(102 citation statements)

References 63 publications

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“…showing that cumulative thermal stress is a strong predictor of population decline in marine populations and ecosystems (Eakin et al, 2010, Marbà & Duarte, 2010, Pansch et al, 2018, Siegle et al, 2018, Stuhr et al, 2017. Accumulated stress beyond a critical threshold results in mortality due to the degradation of cellular components and disruption of physiological functioning (Feijão et al, 2018, Lesser, 2006, Magozzi & Calosi, 2015, Schroda et al, 2015. Although exposure to nonlethal temperatures can also increase tolerance to further stress in some marine organisms (Clapp et al, 1997, Magozzi & Calosi, 2015, Sasaki & Dam, 2019, we do not find evidence for this in our experiment.…”

Section: Discussioncontrasting

confidence: 67%

“…Interestingly, three days of heatwave exposure did not have any significant negative consequences for growth in any genotype (Figure 4). This high tolerance to short but intense heatwaves was surprising, as a previous study has highlighted the negative impact of short heatwaves on diatoms; exposure to simulated heatwaves for three days significantly reduced growth rates in the model diatom Phaeodactylum tricornutum (Feijão et al, 2018). In contrast, we identified that three-day heatwaves sometimes had positive effects on growth rate at either thermal extreme in all three genotypes tested (Figures 2 and 3).…”

Section: Discussionmentioning

confidence: 51%

“…These findings are echoed by a large body of literature that concludes that environmental change is affecting marine phytoplankton, and will continue to do so in the future (Collins et al, 2020). Despite this, only a handful of studies have directly investigated the effect of MHWs on diatoms under controlled laboratory conditions (Bedolfe, 2015, Feijão et al, 2018, Remy et al, 2017.…”

Section: Introductionmentioning

confidence: 99%

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Surviving heatwaves: thermal experience predicts life and death in a Southern Ocean diatom

Samuels

Rynearson

Collins

2020

Preprint

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Extreme environmental fluctuations such as marine heatwaves (MHWs) can have devastating effects on ecosystem health and functioning through rapid population declines and destabilisation of trophic interactions. However, recent studies have highlighted that population tolerance to MHWs is variable, with some populations even benefitting from MHWs. A number of factors can explain variation in responses between populations including their genetic variation, previous thermal experience and the intensity and duration of the heatwave itself. We disentangle the contributions of these factors on population survival and post-heatwave growth rates by experimentally simulating heatwaves (7.5 or 9.2 °C, for up to nine days) for three genotypes of the Southern Ocean diatom Actinocyclus actinochilus. The effects of simulated heatwaves on mortality and population growth varied with both genotype and thermal experience. Firstly, hotter and longer heatwaves increased mortality and decreased post-heatwave growth rates relative to milder, shorter heatwaves. Secondly, growth above the thermal optimum before heatwaves exacerbated heatwave-associated negative effects, leading to higher mortality during heatwaves and slower growth after heatwaves. Thirdly, hotter and longer heatwaves resulted in more pronounced changes to thermal optima (Topt) immediately following heatwaves. Finally, there is substantial intraspecific variation in mortality during heatwaves and in post-heatwave growth. Our findings shed light on the potential of Southern Ocean diatoms to tolerate MHWs, which will increase both in frequency and in intensity under future climate change.

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Section: Discussioncontrasting

confidence: 67%

Section: Discussionmentioning

confidence: 51%

Section: Introductionmentioning

confidence: 99%

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Surviving heatwaves: thermal experience predicts life and death in a Southern Ocean diatom

Samuels

Rynearson

Collins

2020

Preprint

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“…These LC-PUFAs are not produced by higher plants and their production in animals occurs at low rates. Their presence in the analysed Z. noltii samples results most likely from the presence of microalgae in the grass surface, such as diatoms and dinoflagellates, which are at the basis of the aquatic food chains and possess the enzymatic machinery to produce LC-PUFA (Feijão et al, 2017). From the Canonical Analysis of Principal components (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Fatty acid methyl esters (FAME) were separated in a gas chromatograph (3900 Gas Chromatograph, Varian, Palo Alto, CA, USA) equipped with a hydrogen flameionization detector using a fused silica 0.25 mm i.d. ×50 m capillary column (WCOT Fused Silica, CP-Sil 88 for FAME, Varian) (Feijão et al, 2017). Heptadecanoate (C17:0) was used as an internal standard.…”

Section: Fatty Acid Analysismentioning

confidence: 99%

Dwarf eelgrass (Zostera noltii) leaf fatty acid profile during a natural restoration process: Physiological and ecological implications

Duarte

Matos

Pedro

et al. 2019

Ecological Indicators

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A B S T R A C TSeagrass beds are among the most relevant ecosystem engineers, providing essential ecosystem services for the surrounding coastal communities. Alongside, these ecosystems are among the most threaten in the world, and thus several restoration projects have been developed in the past years. Seagrasses are important sources of essential fatty acids (FA) for animals, which are unable to synthetize them. During the seagrass growth and photochemical maturation, there is a membrane remodelling, where some fatty acids are synthetized. When analysing the FA changes at different development stages, one of the first noticeable changes is the increase in C16:1t (trans-hexadecenoic acid), associated to an increase in the chloroplast membrane fluidity, essential for the efficient energy transduction processes to occur in the thylakoids. Also, interesting to observe are the high levels of omega-3 and -6 (30-43% and 18-31% of total fatty acid content, respectively) present in this seagrass, reinforcing the nutritional value of this species as source of essential fatty acids for the primary consumers. Additionally, it is possible to observe that in the more mature plants there is a high leaf concentration of C18:3. Recent reports suggest that C18:3 can act as a direct scavenger of reactive oxygen species (ROS), indicating a lower stress level, as suggested by the higher photochemical efficiency previously observed. Moreover, it is also interesting to observe that total long-chain polyunsaturated fatty acids (LC-PUFAs) content show a significant increase with the biomass development. These LC-PUFAs are not produced by higher plants and their production in animals occurs at low rates, suggesting they may have as origin the microalgae in the grass surface, adding another important ecosystem service to these prairies, as support for microalgae development and carriers of LC-PUFAs into the food web.This membrane remodelling appears to be on the basis of the photochemical maturation of these seagrasses observed in previous studies and can be used as potential and efficient tool to monitor the development stage of the prairies and its physiological status in future restoration processes. Moreover, it becomes evident that highly developed seagrass beds are crucial food source providers in terms of essential fatty acids to the estuarine heterotrophic life.

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Structure and Dynamics of the Diatom Chloroplast

Bojko,

Listwan,

Goss

et al. 2024

Diatom Photosynthesis

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Heat wave impacts on the model diatom Phaeodactylum tricornutum: Searching for photochemical and fatty acid biomarkers of thermal stress

Cited by 63 publications

References 63 publications

Surviving heatwaves: thermal experience predicts life and death in a Southern Ocean diatom

Surviving heatwaves: thermal experience predicts life and death in a Southern Ocean diatom

Dwarf eelgrass (Zostera noltii) leaf fatty acid profile during a natural restoration process: Physiological and ecological implications

Structure and Dynamics of the Diatom Chloroplast

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