|
|
|
|
|
| BASUALTO,SILVIA; RIVERA,PATRICIO; CRUCES,FABIOLA; ECTOR,LUC; ASCENCIO,ENRIQUE. |
| ABSTRACT A light brown colored massive algal proliferation found in a large area of Rio Laja, Chile was studied. The bloom was produced by Gomphoneis minuta, a gomphonemoid diatom forming large branched stalks attached to submerged rocks. At first glance and on account the macroscopic appearance, this type of proliferation could be confused with that of Didymosphenia geminata. Considering its massive presence in Rio Laja and increased distribution in Chilean waters, as well is occurring in many European and American rivers, we postulate that G. minuta could be a nuisance species in Chilean rivers, and similar to D. geminata, it must be controlled to verify its propagation in the country. |
| Tipo: Journal article |
|
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200457 |
| |
|
| |
|
|
| ASCENCIO,ENRIQUE; RIVERA,PATRICIO; CRUCES,FABIOLA. |
| Se menciona por primera vez para las aguas continentales de Chile a Peridiniopsis elpatiewskyi (Ostenfeld) Bourrelly, una especie de amplia distribución geográfica, pero escasamente citada para Suramérica. La especie fue encontrada en la laguna Lo Méndez (VIII Región) y observada y fotografiada mediante microscopía fotónica y electrónica de barrido. Su fórmula tabular es Po, X, 4´, 7´´, 6C, 5S, 5´´´, 2´´´´. Se describen sus características morfológicas relevantes y se analizan las diferencias entre el material chileno y el descrito en la literatura. Se confirma la preferencia del taxón para aguas eutróficas con pH alcalino. |
| Tipo: Journal article |
|
| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100006 |
| |
|
| |
|
|
| RIVERA,PATRICIO; CRUCES,FABIOLA; GALLARDO,VÍCTOR A.. |
| The so-called "surf diatoms" constitute a small group of species that are present with great abundance in the surf zones of some sandy beaches where often the accumulations are dominated only for one of these species. They adhere to air bubbles generated by wave action forming green or brown patches that float in the surf zone, remaining as long streaks on the beach. In May 2015 a green accumulation was detected in Coquimbo Bay in northern Chile. The study of samples with light and electron microscopy techniques showed the presence of Aulacodiscus kittonii, a well-known surf diatom. This is the first report of this kind for Chile and for the whole coast of the Eastern South Pacific Ocean with A. kittonii as the dominant species. It is also the first report... |
| Tipo: Journal article |
|
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100001 |
| |
|
|
| ARANEDA,ALBERTO; CRUCES,FABIOLA; TORRES,LAURA; BERTRAND,SEBASTIEN; FAGEL,NATHALIE; TREUTLER,HANS C; CHIRINOS,LUIS; BARRA,RICARDO; URRUTIA,ROBERTO. |
| Chironomid assemblages and sedimentological parameters (grain size, organic content, mineralogy) of a short sediment core from Lake Galletué (38°41' S, 71°17' W) were analysed. The sedimentary record includes one volcanic ash (tephra) layer, which has a completely different composition than the host sediment in terms of organic content, grain size, and mineralogy. According to the geochronology (210Pb and 137Cs), this ash layer corresponds to the eruption of Llaima Volcano in 1956-1957. The tephra deposition had an impact on chironomid assemblages producing, among other changes, an increase in Parakiefferiella and a decrease in Ablabesmyia, although no noticeable change was detected in the diversity index. When compared with other studies, our results also... |
| Tipo: Journal article |
Palavras-chave: Chironomids; Lake sediments; Tephra layer; Southern Chile. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000200002 |
| |
|
|
| CRUCES,FABIOLA; URRUTIA,ROBERTO; ARANEDA,ALBERTO; TORRES,LAURA; CISTERNAS,MARCO; VYVERMAN,WIM. |
| La presente investigación realizó una reconstrucción de la evolución trófica de Laguna Grande de San Pedro (VIII Región, Chile) durante el último siglo, a través del análisis estratigráfico de diatomeas y registros geoquímicos preservados en un núcleo de sedimento obtenido en el lago. Los resultados obtenidos señalan que la comunidad de diatomeas ha variado su composición a través del tiempo, reconociéndose cuatro períodos distintos, que representan cada uno de ellos una condición trófica diferente. Por otra parte, los registros geoquímicos aumentan sus tasas de acumulación hacia los estratos superficiales del perfil, evidenciando un aumento de la productividad hacia la actualidad. De acuerdo a lo anterior, es posible concluir que la productividad de... |
| Tipo: Journal article |
Palavras-chave: Trofía; Diatomeas; Nutrientes; Sedimento; Paleolimnología. |
| Ano: 2001 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200015 |
| |
|
|
| RIVERA,PATRICIO; AVARIA,SERGIO; CRUCES,FABIOLA. |
| La familia Hemiaulaceae comprende cuatro géneros, señalados previamente para las aguas chilenas con las siguientes especies: Cerataulina pelagica (Cleve) Hendey, Hemiaulus sinensis Greville, H. membranaceus Cleve, Climacodium biconcavum Cleve, Eucampia antarctica (Castracane) Mangin, E. cornuta (Cleve) Grunow y E. zodiacus Ehrenberg. Sin embargo, el análisis con microscopía fotónica y electrónica de muestras recolectadas en aguas marinas chilenas que contenían representantes de esta familia (incluyendo la mayoría de aquellas estudiadas anteriormente por otros investigadores nacionales) reveló que (1) el género Cerataulina está representado por C. pelagica, distribuida a lo largo de la costa chilena entre Arica por el norte y el Estrecho de Magallanes por... |
| Tipo: Journal article |
Palavras-chave: Diatomeas; Hemiaulaceae; Chile; Morfología; Taxonomía. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000400009 |
| |
|
|
| URRUTIA,ROBERTO; KOEN,SABBE; CRUCES,FABIOLA; POZO,KARLA; BECERRA,JOSE; ARANEDA,ALBERTO; VYVERMAN,WIM; PARRA,OSCAR. |
| Diatom, hydrocarbons and fatty acid sedimentary records were used for reconstructing the recent (last 150 years) palaeolimnological history of Laguna Chica of San Pedro (Concepción, VIII Región, Chile). Cluster analyses (Constrained Incremental Sum of Squares) on the diatom data revealed three distinct periods. The first period (1883-1940's) showed a pronounced increase in sedimentation rate and a slight increase in organic matter accumulation. In this period, eutrophic species (Aulacoseira granulata and Staurosira construens) became increasingly dominant. From the 1940s until the 1970s the diatom signal is more equivocal: after the initial decrease in the relative abundance of A. granulata and S. construens their numbers fluctuate without a clear pattern.... |
| Tipo: Journal article |
Palavras-chave: Diatoms; Hydrocarbons; Fatty acids; Paleolimnology; Land use. |
| Ano: 2000 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400014 |
| |
|
|
|
