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^Istjtt. Botánica Volumen 48 Números 1-4 ISSN 0016-5301 ^ISTJTT. BOTÁNICA VOLUMEN 48 NÚMEROS 1-4 UNIVERSIDAD DE CONCEPCION-CHILE FACULTAD DE CIENCIAS BIOLÓGICAS Y DE RECURSOS NATURALES UNIVERSIDAD DE CONCEPCIÓN CHILE DIRECTOR DE LA REVISTA: Andrés O. Ángulo REEMPLAZANTE DEL DIRECTOR: Osear Matlhei J. REPRESENTANTE LEGAL: Augusto Parra Muñoz PROPIETARIO Universidad de Concepción DOMICILIO LEGAL Víctor Lamas 1290. Concepción, Ctiile EDITOR EJECUTIVO SERIE BOTÁNICA Roberto Rodríguez R. COMITÉ ASESOR TÉCNICO Miren Alberdi David M. Moore Universidad Austral de Chile University of Reading Krisler Alveal Edmundo Pisano Universidad de Concepción Universidad de Magallanes Gregory Anderson Carlos Ramírez University of Connecticut Universidad Austral de Chile Sergio Avaria Patricio Rivera R. Universidad de Valparaíso Universidad de Concepción Carlos Bicudo Claude Sastre Instituto de Botánica. Sao Paulo Museum National d'Histoire Naturelle, Paris ángel L. Cabrera ToD F. SruESSY Instituto de Botánica Darwinion Ohio State University Mariela González Charlotte Taylor Universidad de Concepción Missouri Botanical Carden JúRKE Grau Guillermo Tell Ludwig-Maximiliams Universitát München Universidad de Buenos Aires GlNÉS LÓPEZ Eduardo Ugarte M. Real Jardín Botánico de Madrid Universidad de Concepción Clodomiro Marticorena CaROUNA VlLLAGRÁN Universidad de Concepción Universidad de Chile Óscar Matthei Universidad de Concepción 1 ISSN 0016-5301 BOTÁNICA VOLUMEN 48 NÚMEROS 14 CONTENIDO / CONTENTS Nora Gómez. Hora Dátonx)lógica del Embalse Río ID (Piov. Córdoba, Argentina) I. Centrales ... 003 Diatom flora from Embalse Río ni (Prov. Córdoba, Argendne) I. Centrales Maritza HoENEiSEN, ROBERTO RODRÍGUEZ Y MARIO SiLVA Metabolitos secundarios de Mutisia spinosa Ruiz et Pavón (Asteraceae) 01 Secondary metabolites oí Mutisia spinosa Ruiz et Pavón (Asteraceae) David Galloway Y Clodomiro Marticorena. A bibliography ofchileanlichenology .... 017 Bibliografía de liquenología de Chile Carlos Ramírez, Cristina San Martín, R. Medina y D. Contreras Estudio de la flora hidrófila del Santuario de la Naturaleza "Río Cruces" (Valdivia, Chile) 067 Study of the hydrophylous flora of Che Nature's Sanctuary "Río Cruces" (Valdivia, Chile) James Aronson. Description and distribución oí Acacia macracantha Humb. et Bonpl. exWilld. (Leguminosae, Mimosoideae) in northem Chile 081 Descripción y distribución de Acacia macracaníha Humb. et Bonpl. ex Willd. (Leguminosae, Mimosoideae) en el norte de Chile ALICIA Hoffmann y Sebastián Teiller La flora de la Isla de San Félix (Archipiélago de las Desventuradas, Chile) 089 The flora of San Félix Islands (Desventuradas Archipelago, Chile) Óscar Parra, Patricio Rivera, G.L Floyd y L.W. Wilcox. Cultivo, morfología, ultraes- tructura y taxonomía de un fitoflagelado asociado a mareas rojas en Chile: Heterosigma a/taj/iiwo (Hada) Hada 101 Culture morphology, ultrastructure and taxonomy of a phyíoflagellate associated to a local red tide in Chile: Heterosigma akashiwo (Hada) Hada Roberto Rodríguez y Max Quezada. Nueva combinación en Drimys J.R. et G. Forster (Winteraceae) de Chile 1 1 New combination in Drimys J.R. et G. Forster (Winteraceae) of Chile. Susana Martínez y Lincoln Conctance. Una nueva especie de Azorella (Apiaceae) para Chile 115 A new species oí Azorella (Apiaceae) from Chile Chri.")TIAn Yon Bohlen. Nota sobre el género Mimulus L. (Scrophulariaceae) 1 19 Note on the genus Mimulus L. (Scrophulariaceae) Clodomiro .Marticorena y Max Quezada. Adiciones y notas a la flora de Chile 121 Addiiions and notes to the flora of Chile UNIVERSIDAD DE CONCEPCION-CHILE "Los infinitos seres naturales no podrán perfectamente conocerse sino luego que los sabios del país hagan un especial estudio de ellos' CLAUDIO GA Y, Hist. de Chile. 1:14 (1848) Portada: Drimus andina ESTA REVISTA SE TERMINO DE IMPRIMIR EN LOS TALLERES DE Editora AnIbal Pinto. S.A., MAIPU 769,CONCEPCIONCHILE, EN EL MES DE DIC lEMBRE DI 1991. LA QUE SOLO ACTÚA COMO IMPRESORA PARA EDICIONES UNIVERSIDAD DE CONCEPCIÓN Gayana, Bot. 48 (1-4): 3-9, 1991 ISSN 0016-5301 FLORA DIATOMOLOGICA DEL EMBALSE RIO III (PROV. CÓRDOBA, ARGENTINA) I. CENTRALES* día TOM flora FROM embalse rio III (PROV. CÓRDOBA, ARGENTINE) I. CENTRALES Nora Gómez" RESUMEN ABSTRACT Durante un estudio que incluyó muéstreos a lo largo de tres During a three years and a half sampling programme, seven años y medio en el Embalse Rio III, fueron identificados en el taxa of Centric diatoms were found on the limnetic plankton plancton limnético siete taxa de diatomeas Céntricas {Aula- Embalse Río III. {Aulacoselra granúlala (Ehr.) Simonsen, A. coseira granúlala (Ehr.l Simonsen, A. granúlala var. angus- granúlala var. anguslissima (O. Müll), A. granúlala var. an- lissima (O. Müll.l Simonsen, A. granúlala var. anguslissima guslissima f. spiralis (Hust.) Czarnecki & Reinke, A. lirala f. spiratis (Hust.) Czarnecki & Reinke, A. liraia var. alpígena var. alpígena (Grun.l Haworth, Cyclolella meneghlnlana (Grun.l Haworth. Cyclolella meneghlnlana Kützing, Melosi- Kützing, Melosira varians Agardh, Aciinocyclus normanll f. ra varians Agardh, Aciinocyclus normanll f. subsalsa (Juhl- subsalsa (Juhl-Dannf) Hustedt). In this paper meristic charac- Dannfl Hustedl). En este trabajo se incluyen características teristics, ecological notes and ilustrations based on optic meristicas, notas ecológicas e ilustraciones en base a observa- microscope and electronic microscope are included. ciones realizadas mediante microscopía óptica y electrónica de barrido. Keywords: Diatoms, freshwater, taxonomy, ecology, Argen- tine. INTRODUCCIÓN La información acerca de las bacilariofitas de este cuerpo de agua era sumamente escasa, ya Las diatomeas desempeñan un papel significativo que sólo se contaba con breves listados a nivel ge- en el fitoplancton del Embalse Rio III, por consti- nérico (Cordini, 1950; Boschi & Fuster de Plaza, tuir una fracción numéricamente importante del 1959) y la mención de Melosira granulara mismo (Gómez, 1989). (Ehrenberg) Raifs = Aulacoselra granúlala (Ehrenberg) Simonsen (Bonetto, A. A., D.H. Di Persia, R. Maglianesi & M.C. Corigliano, 1976). La intención del presente trabajo es dar a co- nocer la flora diatomológica perteneciente al or- * Contribución Científica N" 454 del Instituto de Llm den Centrales presentes en el plancton limnético nologia "Dr. Raúl A. Ringuclet", ** instituto de Limnología "Dr. Raúl A, Ringuelet",Ca de esta represa, conjuntamente con aspectos eco- silla de Correo N" 712, La Plata, Argentina. lógicos vinculados a la misma. Gayana,Bot. 48(1-41, 1991 MATERIALES Y MÉTODOS Los muéstreos se realizaron entre noviembre de 1977 y mayo de 1981, en cinco estaciones de muestreo ordenadas a lo largo del eje mayor de! embalse (Fig. 1 ), con un intervalo muestral de dos meses. Para el análisis cualitativo se utilizaron redes de plancton de 10, 25 y 30 ^im de apertura de malla, con el fin de retener la mayor cantidad de organismos en relación con el tamaño de los mis- mos. La metodología empleada para la extracción de las muestras destinadas al análisis cuantitativo se detalla en Gómez (1984a). Para el presente es- tudio se empleó el promedio del número de orga- nismos de las cinco estaciones de muestreo para Fig 1. Embalse Rio ubicación de las los distintos taxa; con estos datos se construyó la muestreo. Tabla L cuatro tamaños crecientes Tabla 1. Distribución temporal de las diatomeas Centrales del Embalse Rio III. Los circuios de organis- son proporcionales a la abundancia, siendo equivalentes respectivamente a:<90. 100-900. 1.000-5.000. y >5.000 • mos/m- 10*; : ausente. Aulacoseira granúlala AA A^B A A A^V^fe^Vw A A 9w^V9V^WW A. granulata var. angustissima -©-•-•- -----•©©©-"•"^ A. granulata var. angustissima í. spiralis ^^ 9999- -99999# ^^ Actinocyclus normami f. subsalsa --••9«- -• ^P^P9 • 9 W 9 W -4999 Melosira varians «--«#•-••' -••---•-- -- A. tirata var. alpígena _ _ ___0^_0-_ ------»---- Cyclotella meneghiniana 9«99*99«*«#***~ 9^P» • • • • Para la limpieza del material se empleó la me- El examen de las muestras se realizó con un todología propuesta por Balach, E. & H.J., microscopio fotónico Olympus BH con conden- Ferrando (1964) y por Hasle, G. & E.E. Syvert- sador de contraste de fases. Para las observa- sen (1980). El montaje definitivo del material se ciones al MEB se empleó un equipo Jeol JSM-T realizó con Hyrax. 100. La colección de muestras y preparados Diversos parámetros físico-químicos fueron microscópicos fue depositada en el Instituto de medidos entre noviembre de 1977 y 1979, los Limnología "Dr. Raúl A. Ringuelet" bajo la de- cuales figuran en la Tabla II; para cada una de nominación ID. Embalse Rio III, Prov. Córdo- esas variables se da el valor máximo y mínimo de ba, Argentina. las 1 3 mediciones obtenidas. Estos datos fueron Flora Diatomológica Prov. Córdoba: N. Gómez Tabla U. Parámetros físico-quimicos del Embalse Rio III del periodo noviembre 1977-1979. Minimo Máximo Temperatura: °C Cayana, Bot. 48(1-4), 1991 Diámetro valvar 8-32 ^m; eje pervalvar; 20-40 Aulacoseira lirata var. alpígena (Grunow) Haworth Mm. Figs. 2, 9, 10 Ecología Especie eutrófica, de lagos, lagunas, ríos y arroyos. Alcalófila (pH: 6,4-9, óptimo alrede- Haworth, E. Y., pp. 141142, figs. 20-27 (1988); dor de 8,5). Beta-mesosapróbica. Perifítica, ti- Hustedt, F., pp. 92-93, fig. 54 (1930); Gasse, F., coplanctónica. p. 76,lám. II, figs. 13-14(1986). Observaciones Sólo en cuatro oportunidades esta Diámetro valvar 6-7 nm; eje pervalvar: 6-8 íüti; especie fue hallada en las muestras estudiadas, estrías pervalvares: 20-25 en 10 Mm; aréolas re- reuniendo en dichas ocasiones
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