Effects of temperature, salinity, irradiance, and nutrients on the development of carposporelings and tetrasporophytes in Gracilaria domingensis (Kütz.) Sonder ex Dickie (Rhodophyta, Gracilariales)
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Fernanda Ramlov
,
Jonatas M.C. de Souza
Abstract
Different environmental factors play important roles in the growth, reproduction, and distribution of marine macroalgae. We investigated the effects of temperature, salinity, irradiance, and nutrients on the growth of carposporelings and tetrasporophytes of Gracilaria domingensis. Carposporelings grew at temperatures of 25°C and 30°C, but they did not survive at 15°C and 20°C. In contrast, tetrasporophytes grew over a wide range of temperatures (15–30°C) with optimum growth between 20°C and 25°C. Both carposporelings and tetrasporophytes tolerated a wide range of salinity (25–60 and 10–50, respectively), but carposporelings were more sensitive to lower salinities (10–20), while tetrasporophytes were more sensitive to higher salinities (60). The highest growth rates in basal discs of carposporelings occurred when they were grown in 25% strength von Stosch enriched medium (VSES) with an illumination of 150 μmol photons m-2 s-1; erect fronds grew best in 25% and 50% strength VSES with illumination of 100 μmol photons m-2 s-1. The VSES strength did not influence the growth of tetrasporophytes of G. domingensis. Highest growth rates of tetrasporophytes occurred at 100 μmol photons m-2 s-1. These results demonstrate very different physiological responses between carposporelings and tetrasporophytes of G. domingensis and, as such, they offer guidelines for the selection of potential areas for the cultivation of the species.
©2012 by Walter de Gruyter Berlin Boston
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- Application of image analysis software to the morphometrics of Posidonia oceanica (L.) Delile and Cymodocea nodosa (Ucria) Ascherson
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Articles in the same Issue
- Masthead
- Masthead
- Research Articles
- Fucoid assemblages on the north coast of Spain: past and present (1977–2007)
- New record of Sargassum denticarpum Ajisaka (Fucales, Phaeophyceae) from Iriomote Island (Ryukyu Archipelago, Japan)
- Seasonal periodicity and reproduction of brown algae (Phaeophyceae) at Puerto Deseado (Patagonia)
- Determining bathymetric distributions of the eelgrass Zostera marina L. in three turbid estuaries on the eastern North Pacific coast
- Morphological and molecular evidence demonstrates the amphi-Atlantic distribution of Laurencia catarinensis (Ceramiales, Rhodophyta)
- Effects of temperature, salinity, irradiance, and nutrients on the development of carposporelings and tetrasporophytes in Gracilaria domingensis (Kütz.) Sonder ex Dickie (Rhodophyta, Gracilariales)
- A novel method for phosphoprotein extraction from macroalgae
- Antioxidants in mangrove plants and endophytic fungal associations
- The marine halophytes Carpobrotus edulis L. and Arthrocnemum macrostachyum L. are potential sources of nutritionally important PUFAs and metabolites with antioxidant, metal chelating and anticholinesterase inhibitory activities
- Culture medium optimization and lipid profiling of Cylindrotheca, a lipid- and polyunsaturated fatty acid-rich pennate diatom and potential source of eicosapentaenoic acid
- Short Communications
- Application of image analysis software to the morphometrics of Posidonia oceanica (L.) Delile and Cymodocea nodosa (Ucria) Ascherson
- Delayed modifications in plant-water relations in the coastal marsh halophyte Spartina patens following sudden increases in soil salinity
- Algicidal activity and potential antifouling defenses in macroalgae from the western Antarctic Peninsula including probable synergistic effects of multiple compounds
