Carpospore and tetraspore release and survival in Chondracanthus squarrulosus (Rhodophyta: Gigartinaceae) from the Gulf of California
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Isaí Pacheco-Ruíz
,
Alejandro Cabello-Pasini
Abstract
We tested effects of light and temperature on survival and development of spores of Chondracanthus squarrulosus to determine their influence on the in situ haploid: diploid population ratio. Initially, reproductive tissues of both phases were induced to release spores under standard laboratory conditions. As in most of the Gigartinales, larger numbers of carpospores were released relative to tetraspores (4:1). Tetraspores, however, had higher germination rates (70% vs. 30%). Gametophytes and tetrasporophytes, germinated from spores, were exposed to light and temperature gradients (45–135 μmol photons m-2 s-1 and 14–30°C). Tetrasporophyte survivorship was negatively affected by high temperatures. In contrast, gametophytes had 100% survival at all temperatures tested and their growth rates were greater than those observed in the tetrasporophytes, particularly at higher temperatures. Therefore, the low germination rate of carpospores and the greater survivorship in the first gametophyte stages at higher temperatures would help explain the dominance of the gametophytes over tetrasporophytes of C. squarrulosus in the Gulf of California. A Leslie matrix based on the number of spores released and adult plant survival demonstrated that it is possible to generate a stable adult plant ratio close to the one that we observed in the field.
©2011 by Walter de Gruyter Berlin New York
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Articles in the same Issue
- Research Articles
- Succession patterns in algal turf vegetation on a Caribbean coral reef
- Carpospore and tetraspore release and survival in Chondracanthus squarrulosus (Rhodophyta: Gigartinaceae) from the Gulf of California
- Morphology and taxonomy of Anadyomene species (Cladophorales, Chlorophyta) from Bahia, Brazil
- Sargassum polyceratium (Phaeophyceae, Fucaceae) surface molecule activity towards fouling organisms and embryonic development of benthic species
- Colpomenia claytonii sp. nov. (Scytosiphonaceae, Phaeophyceae) based on morphology and mitochondrial cox3 sequences
- A survey of the benthic aquatic flora in transitional water systems of Greece and Cyprus (Mediterranean Sea)
- Morphological study of the genus Cocconeis Ehrenberg (Bacillariophyceae) collected during the 1897–1899 Belgian Antarctic Expedition
- Cloning differentially expressed salt induced cDNAs from Dunaliella salina under super saturated salt stress using subtractive hybridization
- Antioxidant response of the microalga Dunaliella salina under salt stress
- Temporal variation in growth and reproduction of Enhalus acoroides (L.f.) Royle in a monospecific meadow in Haad Chao Mai National Park, Trang Province, Thailand
- Lignicolous marine fungi from Yokosuka, Japan
