Growth and biochemical composition of a microphytobenthic diatom (Entomoneis paludosa) exposed to shorebird (Calidris alpina) droppings

Jauffrais, Thierry; Drouet, Sigrid; Turpin, Vincent; Méléder, Vona; Jesus, Bruno; Cognie, Bruno; Raimbault, Patrick; Cosson, Richard P.; Decottignies, Priscilla; Martin‐Jézéquel, Véronique

doi:10.1016/j.jembe.2015.04.014

Cited by 21 publications

(20 citation statements)

References 85 publications

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“…Our finding that the northward arrival of Western Sandpipers and other shorebirds on Roberts Bank mirrors seasonal increases in total lipid and in the abundance of essential fatty acids found in intertidal biofilm provides a new explanation. The discovery complements previous studies demonstrating that shorebirds alter their foraging behaviors to select areas with high microphytobenthic biomass Jiménez et al, 2015) and the activities of shorebirds can significantly affect benthic diatom growth (Jauffrais et al, 2015). The inference is that migration success for shorebirds hinges on their presence at a stopover site that generally coincides with maximal total lipid and fatty acid production at the site.…”

Section: Implications For Shorebird Migrationsupporting

confidence: 78%

Peak Abundance of Fatty Acids From Intertidal Biofilm in Relation to the Breeding Migration of Shorebirds

et al. 2020

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Intertidal biofilm is a thin layer of microbes and meiofauna enmeshed in an extracellular polymeric matrix within and on top of mudflat sediment. This medium provides a dynamic resource for a variety of consumers in estuarine habitats, and is rich in essential fatty acids that birds require for long-distance migration. We measured seasonal changes in biofilm fatty acid content from spring to summer on the Fraser River Estuary, one of the richest and most important ecosystems for migrant and wintering waterbirds in Canada. Fatty acid content in biofilm showed a strong seasonal pattern with a peak in the spring that is associated with the northward migration of Western Sandpipers (Calidris mauri) to their breeding grounds. This peak is linked to the abundance and physiological state, and hence nutritional condition, of epipelic diatoms, which, in turn, depend on a combination of mudflat topography, salinity, temperature, and nutrients that can fluctuate widely with the freshwater inputs from the Fraser River. Specifically, areas with higher elevation (i.e., ∼1 m) had longer periods of exposure to ambient conditions (i.e., light, warm temperatures, gas exchange into/out of biofilms) that facilitated more biofilm growth and higher fatty acid content. Moreover, springtime changes in water chemistry (i.e., salinity/osmotic stresses and nutrients) and temperature facilitated the production of higher overall total lipid/fatty acid contents in the mudflat biofilms compared to summer. Effective conservation of migrating shorebirds depends on the protection of underlying processes at important stopover sites that promote biofilm communities to escalate their production of lipids, including essential fatty acids, during key times of the year.

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Section: Implications For Shorebird Migrationsupporting

confidence: 78%

Peak Abundance of Fatty Acids From Intertidal Biofilm in Relation to the Breeding Migration of Shorebirds

et al. 2020

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“…fluvialis, T. pseudonana) in sufficient nitrogen conditions (Jauffrais et al, 2015(Jauffrais et al, , 2016Marshall Darley, 1977;Rios et al, 1998). The photosynthetic pigments also were not affected by the treatment and chlorophyll a content as well as chlorophyll a /C remained similar in both culture conditions.…”

Section: Effect Of Bacteria On Diatom's Growth and Biochemical Composmentioning

confidence: 99%

Effect of bacteria on growth and biochemical composition of two benthic diatoms Halamphora coffeaeformis and Entomoneis paludosa

Jauffrais

Agogué

Gémin

et al. 2017

Journal of Experimental Marine Biology and Ecology

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Jézéquel. Effect of bacteria on growth and biochemical composition of two benthic diatoms Halamphora coffeaeformis and Entomoneis paludosa. Journal of Experimental Marine Biology and Ecology, Elsevier, 2017, 495, pp.65 -74 between Bacteroidetes (Flavobacteriia) and Proteobacteria (alpha-and gammaproteobacteria).After treatment with antibiotics, the residual bacterial community was ~37% Flavobacteriia

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“…Benthic diatoms, in the absence of light cues, may also exhibit negative gravitaxis inducing upward movements to the sediment surface (Frankenbach et al, 2014). Most studies on diatom movement, growth and photosynthetic properties have investigated the effect of light intensity regardless of light spectra (Perkins et al, 2001;Paterson et al, 2003;Underwood et al, 2005;Jesus et al, 2006;Chevalier et al, 2010;Jauffrais et al, 2015). Light intensity is a wavelength weighted energy measurement that refers to the total number of photons received per unit area in a given time.…”

Section: Introductionmentioning

confidence: 99%

“…Its use has been widely spread in photosynthetic studies because photosynthetic photochemical reactions are driven by total amount of photon received rather than the amount of energy received by each photon (Kume, 2018). In the aforementioned studies (Perkins et al, 2001;Paterson et al, 2003;Underwood et al, 2005;Jesus et al, 2006;Chevalier et al, 2010;Jauffrais et al, 2015) light has been integrated over the photosynthetic active radiation (PAR) spectrum, not accounting for the spectral variations within the light spectrum. However, these changes in light composition can affect diatom photo-protective capacity and photo-acclimation to high light intensities (Phaeodactylum tricornutum) (Schellenberger Costa et al, 2013a;Brunet et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Effect of Light Intensity and Light Quality on Diatom Behavioral and Physiological Photoprotection

et al. 2020

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In this study, we investigated the different photoregulation responses of diatom dominated natural biofilms to different light intensities and wavelengths, over a tidal cycle in the laboratory. We compared the overall effect of light spectral quality from its light absorption (Qphar) dependent effect. Two different conditions were compared to study photoprotective strategies: sediment (migrational) and without sediment (non-migrational). Three different colors (blue, green, and red) and two light intensities (low light, LL at 210 µmol.photons.m −2 .s −1 and high light, HL at 800 µmol.photons.m −2 .s −1) showed strong interactions in inducing behavioral and physiological photoprotection. Non-migrational biofilm non-photochemical quenching (NPQ) was much more reactive to blue HL than red HL while it did not differ in LL. We observed a biphasic NPQ response with a light threshold between 200 and 250 µmol.photons.m −2 .s −1 of Qphar that elicited the onset of physiological photoprotection. Similar HL differences were not observed in migrational biofilms due to active vertical migration movements that compensated light saturating effects. Our results showed that within migrational biofilms there was an interaction between light quality and light intensity on cell accumulation pattern at the sediment surface. This interaction led to inverse diatom accumulation patterns between blue and red light at the same intensity: LL (blue + 200.67%, red + 123.96%), HL (blue + 109.15%, red + 150.34%). These differences were largely related to the differential amount of light absorbed at different wavelengths and highlighted the importance of using wavelength standardized intensities. Different vertical migration patterns significantly affected the total pigment content measured at the surface, suggesting that cell could migrate downward more than 2 mm as a photoregulatory response. Colloidal carbohydrates patterns paralleled the vertical migration movements, highlighting their possible role in diatom motility. Our data strongly suggests a wavelength and Qphar dependent light stress threshold that triggers upward and downward movements to position microphytobenthic diatoms at their optimal depth.

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Growth and biochemical composition of a microphytobenthic diatom (Entomoneis paludosa) exposed to shorebird (Calidris alpina) droppings

Cited by 21 publications

References 85 publications

Peak Abundance of Fatty Acids From Intertidal Biofilm in Relation to the Breeding Migration of Shorebirds

Peak Abundance of Fatty Acids From Intertidal Biofilm in Relation to the Breeding Migration of Shorebirds

Effect of bacteria on growth and biochemical composition of two benthic diatoms Halamphora coffeaeformis and Entomoneis paludosa

Effect of Light Intensity and Light Quality on Diatom Behavioral and Physiological Photoprotection

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