Effects of Irradiance and Temperature on the Release and Growth of Carpospores from Gracilaria cornea J. Agardh (Gracilariales, Rhodophyta)
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J. Orduña-Rojas
Abstract
Carpospore liberation, germination and carposporeling growth were investigated in Gracilaria cornea J. Agardh at different combinations of temperature and irradiance in laboratory cultures. Maximum number of carpospores released per cystocarp approached 2500 at 25 °C and 10 μmol m−2 s−1. Student Newman Keuls multiple comparisons showed that the number of carpospores released were significantly different (P < 0.05) between low (10, 25, 50 μmol m−2 s−1) and high (75 and 100 μmol m−2 s−1) irradiances at 25 °C. The highest carposporeling specific growth rates ranged from 4.6 to 5.2% d−1, corresponding to a doubling time of 19.2 to 21.7 days and occurred at 25 and 28 °C at the lowest irradiance levels tested (10 and 25 μmol m−2 s−1). At 31 °C spore release and sporeling growth were significantly depressed regardless of irradiance. Favourable conditions for carpospore release were found at 25 °C and low irradiances (10, 25 and 50 μmol m−2 s−1). The best conditions for sporeling growth in G. cornea were at 25–28 °C and low irradiance. These temperatures corresponded to the environmental conditions during spring on the G. cornea beds from the Yucatan coast.
Copyright (c)1999 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- Effects of Irradiance and Temperature on the Release and Growth of Carpospores from Gracilaria cornea J. Agardh (Gracilariales, Rhodophyta)
- Sargassum Studies in Currimao, Ilocos Norte, Northern Philippines I. Seasonal Variations in the Biomass of Sargassum carpophyllum J. Agardh, Sargassum ilicifolium (Turner) C. Agardh and Sargassum siliquosum J. Agardh (Phaeophyta, Sargassaceae)
- Sargassum Studies in Currimao, Ilocos Norte, Northern Philippines II. Seasonal Variations in Alginate Yield and Viscosity of Sargassum carpophyllum J. Agardh, Sargassum ilicifolium (Turner) C. Agardh and Sargassum siliquosum J. Agardh (Phaeophyta, Sargassaceae)
- An Ice-Bound Planktonic Dinoflagellate Peridiniella catenata (Levander) Balech: Morphology, Ecology and Distribution
- Benthic Algae of Salt-Marshes (Corrubedo Natural Park, NW Spain): The Flora
- Padina tetrastromatica Hauck, a Misapplied Name for P. crispata Thivy in Pacific Mexico
- Seed Enzyme Polymorphism and Autogamy of the Seagrass Posidonia oceanica from the Western Mediterranean
- Seasonal Succession Patterns of Phytoplankton in the Bahía Blanca Estuary (Argentina)
- New Records of the Green-Algal Genus Rhipiliopsis (Udoteaceae, Caulerpales) from Papua New Guinea and the Seychelles Islands, Including the Description of Rhipiliopsis papuensis Coppejans, De Clerck et Leliaert, sp. nov.
- The Fatty Acid Composition of Tropical Marine Algae of the Genus Halimeda (Chlorophyta)
- Seasonal Variations of Nutrients and Phytoplankton in the Coastal SW Adriatic Sea (1995–1997)
- Growth and Productivity of Antarctic Sea Ice Algae under PAR and UV Irradiances
- A Pilot Study of Nutrient Enriched Sediments in a Cymodocea nodosa Bed Invaded by the Introduced Alga Caulerpa taxifolia
