Keywords
phenology
life cycle
Venezuela
Gracilariopsis tenuifrons
fenología
ciclo de vida
Venezuela
How to Cite
Abstract
Fenology and life cylce of Gracilariopsis tenuifrons (Gracilariaceae) at Sucre, Venezuela. The aim of this work was to determine the frequency of different reproductive phases and to induce the germination of spores from tetrasporic and cystocarpic Gracilariopsis tenuifrons from Chacopata and La Peña, Venezuela, under controlled laboratory conditions (temperature 22 ± 1ºC, 12L:12D photoperiod, salinity of 36 ± 1 PSU and irradiance of 269 μE m-2 s-1). Tetrasporic individuals dominated numerically over gametophitic individuals. The proportion of vegetative algae was very low. Only cystocarpic algae were collected and the spermatangia were absent. Sporulation, germination and formation of algae suggest that they present a Polysiphonia-type life cycle. Algae with reproductive structures were not obtained in the laboratory,References
Alveal, K., R. Romo, C. Werlinger & M. Nuñez. 1994. Uso de esporas como alternativa de propagación masiva de macroalgas. Rev. Investig. Cient. Tecnol. Ser. Cienc. Mar. 3: 77-87.
Bellorín, A. & A. Lemus. 1997. Efecto de la temperatura y la irradiancia en el crecimiento in vitro del alga Gracilariopsis tenuifrons (Bird & Oliveira) Fredericq & Hommersand (Gracilariales, Rhodophyta). Bol. Inst. Oceanogr. Venezuela, Univ. Oriente 36: 61-67.
Bird, C., J. Van Der Meer & J. Mclachlan. 1982. A comment on Gracilaria verrucosa (Huds.) Papenf. (Rhodophyta:Gigartinales). J. Mar. Biol. Ass. Reino Unido 62: 453-459.
Bird, N., J. Mclachlan & D. Grund. 1977. Studies on Gracilaria. 5. In vitro life history of Gracilaria sp. from the Maritime Provinces. Can. J. Bot. 55: 1282-1290.
Brito, L. & A. Lemus. 1998. Variación anual en el rendimiento y fuerza de gel del agar de Gracilariopsis tenuifrons (Bird et Oliveira) Fredericq et Hommersand de la Península de Araya, Venezuela. Bol. Inst. Oceanogr. Venezuela, Univ. Oriente 37: 74-79.
Hay, M. & J. Norris. 1984. Seasonal reproduction and abundance of six sympatric species of Gracilaria Grev. (Gracilariaceae, Rhodophyta) in a Caribbean subtidal sand plain. Hydrobiologia 116/117: 63-94.
Hoyle, M. 1978. Reproductive phenology and growth rates in two species of Gracilaria from Hawaii. J. Exp. Mar. Biol. Ecol. 35: 273-283.
Hurtado-Ponce, A. 1993. Carpospore germination and early stages of development in Gracilaria edulis (Gmelin) Silva and Gracilaria rubra Chang et Xia (Gracilariales, Rhodophyta). Philipp. Sci. 30: 34-40.
Lemus, A. 1992. Ensayos de cultivo de la agarofita Gracilariopsis tenuifrons (Bird et Oliveira) Fredericq et Hommersand (Rhodophyta) en el Oriente de Venezuela. Mem. VII Simp. Latinoamer. Acuicultura Barquisimeto, Venezuela. Pp. 140-148.
Mclachlan, J. & T. Edelstein. 1977. Life-history and culture of Gracilaria foliifera (Rhodophyta) from South Devon. J. Mar. Biol. Ass. Reino Unido 57: 577-586.
Moller, P. & R. Westermeier. 1988. Cultivo de Gracilaria chilensis (Rhodophyta Gigartinaceae) en condiciones de laboratorio. Gayana Bot. 45: 305-308.
Ogata, E., T. Matsui & H. Nakamura. 1972. The life cycle of Gracilaria verrucosa (Rhodophyceae, Gigartinales) in vitro. Phycologia 11: 75-80.
Oliveira, E. & E. Plastino. 1984. The life history of some species of Gracilaria (Rhodophyta) from Brazil. Jpn. J. Phycol. 32: 203-208.
Pacheco-Ruiz, Y., J. Zertuche-González & R. Aguilar-Rosas. 1993. Ecología reproductiva de Gracilaria pacifica Abbott (Gracilariales, Rhodophyta) en el Estero de Punta Banda, México. Cienc. Mar. 20: 33-41.
Plastino, E. & E. Oliveira. 1988. Deviations in the lifehistory of Gracilaria sp. (Rhodophyta, Gigartinales) from Coquimbo, Chile under different culture conditions. Hydrobiologia 164: 67-74.
Pinheiro-Joventino, F. & C. Frota-Bezerra. 1980. Estudo de fenologia e regenerecao de Gracilaria domingensis Sonder (Rhodophyta, Gracilariaceae), no Estada do Ceará Brasil. Arch. Cienc. Mar. 20: 33-41.
Pinheiro-Joventino, F. 1986. Ecological studies on Gracilaria cervicornis (Turn.) J. Ag. in Ceará State, Brazil. Proc. Int. Seaweed Symp. 12: 87.
Rabanal, S., R. Azanza & A. Hurtado-Ponce. 1997. Laboratory Manipulation of Gracilariopsis bailinae Zhang et Xia (Gracilariales, Rhodophyta). Bot. Mar. 40: 547-556.
Romo-Donoso, H. 1988. Cultivo de algas mediante esporas. Invest. Pesq. 35: 89-98.
White, J., R. Saunders & J. Lindsay. 1981. Seasonal variations in the biomass, quantity and quality of agar, from the reproductive and vegetative stages of Gracilaria (verrucosa type). Bot. Mar. 23: 493-501.
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