Effects of ultraviolet radiation on different life cycle stages of the south Pacific kelps, Lessonia nigrescens and Lessonia trabeculata (Laminariales, Phaeophyceae)

Véliz, Karina; Edding, Mario; Tala, Fadia; Gómez, Iván

doi:10.1007/s00227-006-0301-9

Cited by 41 publications

(24 citation statements)

References 47 publications

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“…It suggests that multiple stress factors interact synergistically or that one factor prevails as a single eVect: photosynthetic activity of sporophytes showed signiWcant individual eVects, whereas germination capacity of zoospores was additionally aVected by interactions. Similar to other studies, microscopic zoospores were shown to be more sensitive than adult macroscopic sporophytes (Dring et al 1996;Coelho et al 2000;Veliz et al 2006;Wiencke et al 2006). …”

Section: Discussionsupporting

confidence: 84%

Interactive effects of radiation, temperature and salinity on different life history stages of the Arctic kelp Alaria esculenta (Phaeophyceae)

et al. 2009

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To estimate the potential eVects of climate change on polar marine macroalgae, studies on interactive stress eVects of multiple climate-related parameters are essential. Interactions of temperature, radiation and salinity on two diVerent life history stages of Alaria esculenta (L.) Greville from the Kongsfjord (Spitsbergen) were investigated for the Wrst time within this study. Adult macroscopic sporophytes of A. esculenta were exposed to diVerent temperatures between 4 and 21°C combined with artiWcial irradiation conditions [photosynthetically active radiation, ultraviolet (UV) radiation: UV-A/UV-B, Wrst experiment] and with diVerent salinities [34, 28, 20 practical salinity units (p.s.u.)ß second experiment]. EVects of photosynthetic activity were determined by measuring variable chlorophyll Xuorescence of photosystem II. Germination success of young microscopic zoospores of A. esculenta was studied under multifactorial stress. Zoospore suspensions were exposed to the three diVerent salinities and irradiation conditions at four temperatures between 2 and 16°C. Overall, A. esculenta exhibited a highly stagespeciWc susceptibility towards the experimental treatments.In both experiments using sporophytes, photosynthetic activity showed signiWcant temperature eVects and only very few signiWcant radiation and salinity eVects. Microscopic stages of A. esculenta were shown to be more sensitive than the adult macroscopic stages, since germination capacity of zoospores was signiWcantly aVected by temperature and salinity changes, and interactions of both. These results suggest that multiple stress factors interact synergistically. Temperature seems to be a predominant environmental parameter for the kelp A. esculenta. Overall, A. esculenta proved to be relatively tolerant and adaptable to increasing temperature and UV radiation, as well as to diluted salinities, but only up to a speciWc limit.

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Section: Discussionsupporting

confidence: 84%

Interactive effects of radiation, temperature and salinity on different life history stages of the Arctic kelp Alaria esculenta (Phaeophyceae)

et al. 2009

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“…2). This ) were required to inhibit their gametogenesis (Véliz et al 2006). Furthermore, Dring et al (1996) and Véliz et al (2006) reported an increase of UV-B tolerance from gametophytes to juvenile and adult sporophytes.…”

Section: Reproductive Success Of Laminariales Under Changing Temperatmentioning

confidence: 99%

“…The microstages, in particular the zoospores of brown algae, were more susceptible to changes in the radiation conditions as compared to their macrothalli (Véliz et al 2006). Moreover, zoospores of deep-water species typically exhibited a higher UV radiation (UVR) susceptibility than those of eulittoral species .…”

Section: Introductionmentioning

confidence: 99%

Interactive effects of UV radiation and temperature on microstages of Laminariales (Phaeophyceae) from the Arctic and North Sea

Müller

Wiencke²,

Bischof³

2008

Clim. Res.

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Spores and gametophytes are considered to be those life-history stages of kelps most susceptible to environmental perturbations and, in particular, to temperature and UV radiation. Microstages of Arctic (Saccharina latissima, Laminaria digitata, Alaria esculenta from Spitsbergen) and temperate kelp species (S. latissima, L. digitata, L. hyperborea from the North Sea) were exposed in 2-factorial experiments to different temperatures (2 to 18°C) and radiation conditions (photosynthetic active radiation, UV-A radiation, UV-B radiation). Our results reveal ecotypic differentiations in the stress responses of zoospores of L. digitata and S. latissima from the Arctic and North Sea. UV-A radiation either enhanced the formation of gametes at elevated temperatures in L. digitata or impaired egg release and subsequent sporophyte formation in L. hyperborea. Microstages exposed to additional UV-B radiation were strongly inhibited to a population-, species-and life phase-specific degree at suboptimal and optimal temperatures. Only gametogenesis of Laminaria spp. was shown to be tolerant to UV-B exposure. Conclusively, in respect to a future scenario of elevated UV radiation regimes and higher summer temperatures in Arctic and North Sea waters, summer-recruiting Arctic species and L. digitata from the North Sea might become endangered by a frequent disturbance of their microstages.

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“…An important stressor for algae can be solar radiation and both high and low radiation levels may negatively affect algal performance (Cronin & Hay 1996c, Véliz et al 2006, Gómez et al 2007). Light reduction strongly affects the energy budget of algae, as well as the amount of carbon available for life processes and for the production of defensive metabolites (Cronin & Hay 1996c, Pavia & Toth 2000, Stamp 2004.…”

Section: Abstract: Seaweeds · Macroalgae · Chemical Defense · Light mentioning

confidence: 99%

Consequences of light reduction for anti-herbivore defense and bioactivity against mussels in four seaweed species from northern-central Chile

Pansch¹,

Cerda²,

Lenz³

et al. 2009

Mar. Ecol. Prog. Ser.

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Effects of ultraviolet radiation on different life cycle stages of the south Pacific kelps, Lessonia nigrescens and Lessonia trabeculata (Laminariales, Phaeophyceae)

Cited by 41 publications

References 47 publications

Interactive effects of radiation, temperature and salinity on different life history stages of the Arctic kelp Alaria esculenta (Phaeophyceae)

Interactive effects of radiation, temperature and salinity on different life history stages of the Arctic kelp Alaria esculenta (Phaeophyceae)

Interactive effects of UV radiation and temperature on microstages of Laminariales (Phaeophyceae) from the Arctic and North Sea

Consequences of light reduction for anti-herbivore defense and bioactivity against mussels in four seaweed species from northern-central Chile

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