Daily course of photosynthesis and photoinhibition in Chondrus crispus (Rhodophyta) from different shore levels

Sagert, Sigrid; Forster, Rodney M.; Feuerpfeil, Peter; Schubert, Harald

doi:10.1017/s0967026297001339

Cited by 31 publications

(44 citation statements)

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“…15,30]. In line with our results, previous studies found that the sensitivity of photoinhibition towards abiotic stress differs with the vertical position of red algae on the shore [15,30,31]. Dring et al [30] assumed that the sensitivity to UV radiation of red algae occurring around the island of Helgoland varies amongst other factors with growth depth of algae.…”

Section: Discussionsupporting

confidence: 89%

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Fatty acid compositions associated with high-light tolerance in the intertidal rhodophytes Mastocarpus stellatus and Chondrus crispus

et al. 2017

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The rhodophytes Mastocarpus stellatus and Chondrus crispus occupy the lower intertidal zone of rocky shores along North Atlantic coastlines, with C. crispus generally occurring slightly deeper. Consequently, M. stellatus is exposed to more variable environmental conditions, related to a generally higher stress tolerance of this species. In order to extend our understanding of seasonal modulation of stress tolerance, we subjected local populations of M. stellatus and C. crispus from Helgoland, North Sea, to short-term high-light stress experiments over the course of a year (October 2011, March, May and August 2012). Biochemical analyses (pigments, antioxidants, total lipids, fatty acid compositions) allowed to reveal mechanisms behind modulated high-light tolerances. Overall, C. crispus was particularly more susceptible to high-light at higher water temperatures (October 2011 and August 2012). Furthermore, speciesspecific differences in antioxidants, total lipid levels and the shorter-chain/longer-chain fatty acid ratio (C14 + C16/ C18 + C20) were detected, which may enhance the tolerance to high-light and other abiotic stress factors in M. stellatus, so that this species is more competitive in the highly variable upper intertidal zone compared to C. crispus. Since the high-light tolerance in C. crispus seemed to be affected by water temperature, interactions between both species may be impacted in the future by rising mean annual sea surface temperature around the island of Helgoland.

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Section: Discussionsupporting

confidence: 89%

“…Species found higher on the coast are generally thought to be less susceptible to environmental stress than those inhabiting lower levels [12,30,31]. M. stellatus and C. crispus occupy different levels within the lower intertidal, with C. crispus generally occurring slightly deeper [4].…”

Section: Introductionmentioning

confidence: 99%

Fatty acid compositions associated with high-light tolerance in the intertidal rhodophytes Mastocarpus stellatus and Chondrus crispus

et al. 2017

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“…Hanelt at al. 1993, Sagert et al 1997, Flores-Moya et al 1998, Gévaert et al 2003. Gévaert et al (2003) showed that in Laminaria saccharina the daily patterns in PAM fluorescence are related to photo-regulation via the xanthophyll cycle.…”

Section: Expt 1: Effects Of Increasing/decreasing Light Shifts On Phomentioning

confidence: 99%

Laminaria hyperborea photosynthesis-irradiance relationship measured by oxygen production and pulse-amplitude-modulated chlorophyll fluorometry

Duarte¹,

Ramos²,

Calado³

et al. 2013

Aquat. Biol.

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Information about photosynthesis−irradiance (P−I) relationships is crucial in many primary production studies. This is frequently obtained using incubation experiments, which may not simulate in situ conditions where algae are adjusting their photosynthetic systems to permanent light variations. There has been increasing interest in pulse-amplitude-modulated (PAM) chlorophyll fluorometry-which measures instantaneous photosynthetic response -particularly in the use of rapid light curves (RLCs) to minimize the confounding effects of light acclimation encountered with traditional 'steady-state' light curves (SSLC). However, there is still a lack of information about how oxygen SSLC curves and estimations from fluorescence P−I curves are related. The present study addresses some of these topics, using Laminaria hyperborea. The objectives of this study were to (1) determine the effect of light sequence (increasing or decreasing) in the estimation of P−I parameters, (2) characterize the daily patterns of P−I curve parameters, (3) compare oxygen and fluorescence P−I parameters and (4) evaluate the possibility of converting fluorescence P−I parameters into oxygen production measurements. Results showed that light sequence had no significant effect on P−I parameters (fluorescence and oxygen) and that P−I curves exhibited considerable differences over the day (F-ratio analysis). Fluorescence SSLCs and RLCs were good oxygen production predictors only at sub-saturating irradiances, when significant linear relationships were obtained with results from oxygen incubations. Thus care should be taken when interpreting PAM fluorescence gross production estimations from higher light intensities. KEY WORDS: Photosynthesis−irradiance relationship · Oxygen incubations · Steady-state light curves · Rapid light curvesResale or republication not permitted without written consent of the publisher Aquat Biol 19: 29-44, 2013 cesses. This dynamic nature may preclude the usage of static P−I relationships, i.e. equations with fixed parameters; instead, these 'parameters' may have to be treated as variables.The P−I relationship of macroalgae is frequently studied using incubation experiments, where algae are kept under different light levels for a period long enough to observe significant changes in dissolved oxygen within the incubation vessels, as a result of photosynthesis and respiration. Physiologically 'oriented' experiments may use small pieces of macroalgae (e.g. Franklin & Badger 2001), allowing more experimental control of light-intensity conditions and, possibly, reducing error variance among replicates if pieces of similar shape, size and cut from the same part of the thallus are used. These experiments provide useful physiological information due to high control of experimental conditions. However, if the main interest is simulating in situ photosynthesis, within the scope of an ecologically 'oriented' study, it is probably more appropriate to use whole organisms in experiments with proper replication, to account for ...

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“…While the lower depth distribution is determined by the need to maintain a positive carbon balance (Gómez et al . 1997), the upper limit primarily depends on the capability of seaweeds to sustain high light stress, and especially on the capacity for dynamic photoinhibition of photosynthesis (Sagert et al . 1997;Hanelt 1998).…”

Section: Introductionmentioning

confidence: 99%

Susceptibility of zoospores to UV radiation determines upper depth distribution limit of Arctic kelps: evidence through field experiments

et al. 2006

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Summary 1The UV susceptibility of zoospores of the brown seaweeds Saccorhiza dermatodea , Alaria esculenta and Laminaria digitata (Laminariales) was determined in field experiments in June 2004 on Spitsbergen (78 ° 55 ′ N, 11 ° 56 ′ E). 2 Freshly released zoospores were exposed for 1 or 2 days at various water depths to ambient solar radiation, ambient solar radiation depleted of UVB radiation (UVBR) and ambient solar radiation depleted of both UVBR and UVAR. Subsequently, germination rates were determined after exposure to favourable light and temperature conditions in the laboratory. 3 The radiation regime was monitored at the water surface and in the water column using data loggers attached adjacent to each experimental platform for the duration of the field exposure. 4 Under ambient solar radiation, the tolerance of zoospores to UVR was highest in the shallow water species S. dermatodea , intermediate in the upper to mid sublittoral A. esculenta and lowest in the upper to mid sublittoral L. digitata . There was, however, no difference in the susceptibility of the zoospores to ambient solar radiation or to solar radiation depleted of UVBR. 5 The water column was relatively UV transparent, especially in the upper water layers. The 1% UVB depth ranged between 5.35 and 6.87 m, although on one stormy day the 1% UVB depth was only 3.57 m, indicating resuspension of sediments. 6 Early developmental stages are most susceptible to environmental stress. Tolerance of zoospores to UVR is a major if not one of the most important factors determining the upper distribution limit of different Laminariales on the shore. 7 Kelps are very important primary producers in inshore coastal ecosystems, serving as food for herbivores and as habitat for many organisms. Enhanced UVBR due to stratospheric ozone depletion may lead to changes in the depth distribution of kelps and may cause significant ecological domino effects.

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Daily course of photosynthesis and photoinhibition in Chondrus crispus (Rhodophyta) from different shore levels

Cited by 31 publications

References 0 publications

Fatty acid compositions associated with high-light tolerance in the intertidal rhodophytes Mastocarpus stellatus and Chondrus crispus

Fatty acid compositions associated with high-light tolerance in the intertidal rhodophytes Mastocarpus stellatus and Chondrus crispus

Laminaria hyperborea photosynthesis-irradiance relationship measured by oxygen production and pulse-amplitude-modulated chlorophyll fluorometry

Susceptibility of zoospores to UV radiation determines upper depth distribution limit of Arctic kelps: evidence through field experiments

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