SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Importancia ecológica del fitoplancton durante El Niño 1991-1993, en el Pacífico Ecuatorial (Ecuador)

Torres, G.; Mero, M.; Calderón, T.; Franco, V.; Salazar, E..

El presente trabajo es una contribución al conocimiento de la bio-oceanografía del mar ecuatoriano, forma parte del proyecto de Monitoreo de las condiciones oceanográficas en el mar ecuatoriano y su relación con eventos de El Niño, realizadas en el B/I ORION del Instituto Oceanográfico de la Armada (INOCAR) en septiembre-octubre 2001, como un aporte a la comunidad científica.

Tipo: Journal Contribution

Palavras-chave: Phytoplankton; Diatoms; Zooplankton; Biological production; Upwelling; Population density; Cruises; Abundance; Geographical distribution; Biological production; Geographical distribution; Phytoplankton; Zooplankton; Population density; Diatoms; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_6112; Http://aims.fao.org/aos/agrovoc/c_32657.

Ano: 2004

URL: http://hdl.handle.net/1834/2297

Variabilidad estacional del fitoplancton y su relación con los parámetros ambientales en el estuario interior de Esmeraldas durante los años 2004-2005

Torres, G..

El objetivo del estudio fue determinar su importancia ecológica y diversidad de los principales grupos del fitoplancton durante El Niño 1991-1992, en tres cruceros realizados en la época cálida-húmeda del ecosistema del Pacífico Ecuatorial (1991, 1992 y 1993).

Tipo: Journal Contribution

Palavras-chave: Marine ecology; Phytoplankton; Upwelling; Chlorophylls; Diatoms; Biological production; El Nino phenomena; Oceanographic stations; Multiship expeditions; Phytoplankton; Biological production; Marine ecology; Chlorophylls; Diatoms.

Ano: 2006

URL: http://hdl.handle.net/1834/2301

Diatomeas y silicoflagelados del fitoplancton del Golfo de Guayaquil: II edición

Tapia, M.E..

Se colectaron y analizaron un total de 96 estaciones distribuidas en cinco áreas de la Provincia de Esmeraldas durante los años 2004-2005. Se elaboraron gráficos de las especies (muestras de red de 50 µ) y la relación con los parámetros físicos y químicos. En la comunidad del fitoplancton presentó una variabilidad en la composición de especies, especialmente en el Terminal Petrolero durante septiembre del 2004 y disminuye en abril del 2005, la mayor densidad poblacional fue para el grupo de diatomeas. Las principales especies en el ambiente marino estuarino Climacosphenia monoligera, Pseudo-nitzschia paradoxa, Thalassiotrix frauenfeldii, Terpsinoe musica, Coscinodiscus excentricus. Las especies representativas en el ambiente marino Navicula tuscula,...

Tipo: Journal Contribution

Palavras-chave: Phytoplankton; Diatoms; Pollution; Estuaries; Station lists; Distribution.

Ano: 2012

URL: http://hdl.handle.net/1834/4653

La clorofila a como un indicador biológico en las estaciones fijas durante el evento La Niña 1999-2000

Jiménez, R..

Fueron estudiadas 44 muestras de plancton, de las cuales 189 especies y variedades de diatomeas y silicoflagelados fueron identificados. La mayoría de las especies son registradas por primera vez para el mar ecuatoriano. Las diatomeas centrales (centricae) es el más importante orden en el Plancton del Golfo, mientras las diatomeas pennales (Pennatae) es el orden más predominante en la región estuarina inferior. El análisis sistemático de cada especie incluye descripción, dibujos, medidas y referencias bibliográficas. Datos de temperatura, salinidad, clorofilas y producción primaria del Golfo de Guayaquil son consideradas como condiciones hidrobiológicas del área.

Tipo: Journal Contribution

Palavras-chave: Diatoms; Phytoplankton; Phytoplankton; Diatoms; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_32657.

Ano: 1983

URL: http://hdl.handle.net/1834/2104

Scanning electron microscope studies on some species of the centric diatom genera Thalassiosira and Coscinodiscus

Tapia, M.E.; Naranjo, Ch..

Se analizaron un total de 58 muestras en La Libertad y 54 muestras de agua marina costera en Manta durante el evento La Niña 1999-2000. Se elaboraron mapas de distribución de clorofila a, y la relación con los parámetros físicos y químicos. Las condiciones físicas durante el desarrollo del evento La Niña 1999-2000, no siguieron un patrón definido, sino que han presentado características particulares para cada región del Océano Pacífico Sur. En Ecuador se observó que la productividad biológica aumentó considerablemente en La Libertad durante el año 2000 existiendo la presencia de afloramientos con núcleos de clorofila a, altas concentraciones celulares e incremento de la abundancia relativa de importantes especies de diatomeas.

Tipo: Journal Contribution

Palavras-chave: Chlorophylls; Biological production; Upwelling; El Nino phenomena; Marine water; Species diversity; Diatoms.

Ano: 2010

URL: http://hdl.handle.net/1834/4214

OMA

Somers, D..

By means of a scanning electron microscope, the submicroscopic structure of four Thalassiosira species and two Coscinodiscus species is studied. Five of these taxa are more or less similar in the arrangement of the areoles; the sixth one is aberrant. Besides the description of each species and the description of the submicroscopic structure of the auxospore of Thalassiosira nordenskiöldii, a classification is given of the six taxa studied.

A model of nematode dynamics in the Westerschelde Estuary

Palavras-chave: Diatoms; Electron microscopy; Microscopy; Coscinodiscus; Thalassiosira.

Ano: 1972

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3457

OMA

Li, J.; Vincx, M.; Herman, P.M.J..

We developed a time dynamic model to investigate the temporal dynamics of nematode community in the brackish zone of the Westerschelde Estuary. The biomass of four nematode feeding groups observed from March 1991 to February 1992 is used to calibrate the model. Using environmental data as the input, the model predicts the temporal modification and interrelation of four nematode feeding groups. Nematodes achieve a dominant position in the community because of their lower loss rate (in respiration, excretion and natural death). Predators which are deposit-feeding macrobenthos control the variations of dominant nematodes, such as omnivores and non-selective deposit feeders. Food availability causes modification only for rare nematodes such as epigrowth...

Paleolimnological studies of Laguna Chica of San Pedro (VIII Region): Diatoms, hydrocarbons and fatty acid records

Palavras-chave: Diatoms; Ecology; Food; Light; Marine nematodes; Meiobenthos; Population dynamics; Predation; Respiration; Temperature; Nematoda [Nematodes].

Ano: 1996

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7284

RChHN

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

20th century fluctuations in the abundance of siliceous microorganisms preserved in the sediments of the Puyuhuapi Channel (44° S), Chile

RChHN

REBOLLEDO,LORENA; LANGE,CARINA B.; FIGUEROA,DANTE; PANTOJA,SILVIO; MUÑOZ,PRÁXEDES; CASTRO,RODRIGO.

We present a 100-year reconstruction of siliceous export production from sediments of the Puyuhuapi Channel (44° S, 70° W) in the Chilean fjords. We use accumulation rates and concentrations of diatoms and silicoflagellates, organic carbon (Corg) and biogenic opal (SiOPAL) as proxies of export production, and fluctuations in the contribution of freshwater diatoms as proxies of rainfall in the hinterland and river runoff. Box core sediments collected at two sites within the Puyuhuapi Channel were analyzed: Station 35 (at the head of the fjord; 56 m water depth) and Station 40 (in the middle of the Channel; 270 m water depth). Surface sedimentation rates were 0.75 cm yr-1 at Station 35 and 0.25 cm yr-1 at Station 40. SiOPAL content averaged ~ 4 % at both...

Tipo: Journal article

Palavras-chave: Siliceous microorganisms; Diatoms; Sediments; Export production; Puyuhuapi Channel; Chilean fjords.

Ano: 2005

URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000300009

Marine diatoms from Buenos Aires coastal waters (Argentina): II. Thalassionemataceae and Rhaphoneidaceae

RChHN

SAR,EUGENIA A; SUNESEN,INÉS; FERNÁNDEZ,PAULA V.

This study describes the diversity of the species belonging to the diatom families Thalassionemataceae Round and Rhaphoneidaceae Forti frequently found in the temperate marine coastal waters of Buenos Aires Province, Argentina, from October 1994 to September 2000. It comprises morphological, taxonomic and distributional analysis of species found in planktonic samples collected at San Clemente del Tuyú, Santa Teresita, La Lucila del Mar, Mar de Ajó, Nueva Atlantis, Pinamar and Villa Gesell. Raw and cleaned samples were analysed with light and scanning electron microscopy. Four taxa of the genus Thalassionema Grunow ex Mereschkowsky amend. Hallegraeff, one of the genus Lioloma Hasle, two of the genus Delphineis Andrews and one of the genus Rhaphoneis...

Tipo: Journal article

Palavras-chave: Diatoms; Thalassionemataceae; Thalassionema; Lioloma; Rhaphoneidaceae; Delphineis; Rhaphoneis.

Ano: 2007

URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000100006

Diatoms from the Colombian Amazon: some species of the genus Eunotia (Bacillariophyceae)

Acta Amazonica

SALA,Silvia Estela; DUQUE,Santiago R.; NÚÑEZ-AVELLANEDA,Marcela; LAMARO,Anabel Alejandra.

This research was carried out in three of the most important basins of the Colombian Amazon (Upper Solimões, Iça and Japurá Rivers). The creeks and lakes that were studied contain abundant diatom species, particularly those of the genus Eunotia. Ten species are described; five of them are registered for the first time in the Amazon basin, and six in all of Colombia. All taxa were photographed with scanning electron microscopy. Fine valve morphology of E. anamargariate, E. pseudoindica, E. triodon, and E. zydodon var. compacta is described for the first time.

Actinella species (Bacillariophyta) from an Amazon black water floodplain lake (Amazonas - Brazil)

Palavras-chave: Diatoms; Eunotia; Distribution; Ecology; Colombian Amazon Basin.

Ano: 2002

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672002000400589

Acta Amazonica

Melo,Sérgio; Torgan,Lezilda Carvalho; Raupp,Stela Valenti.

The genus Actinella Lewis was studied using planktonic samples from a black water floodplain lake in Central Amazon region. For species identification the taxa were morphological and morphometricaly analyzed on base in light microscope (LM) and scanning electronic microscope (SEM). Five species were registered: Actinella brasiliensis Grunow, A. guianensis Grunow, A. gracile Kociolek, A. mirabilis (Eulenstein ex Grunow) Grunow and A. robusta Hustedt. A. gracile is reported for the first time for Amazon State and black water systems and it is firstly documented with SEM. In addition, a review of geographic distribution of Actinella species in Brazilian Amazon region is given.

Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir

Palavras-chave: Actinella; Diatoms; Amazon; Black water; Floodplain lakes.

Ano: 2010

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672010000200004

Acta Botanica

Wojciechowski,Juliana; Burda,Tamires Marcela; Scheer,Mauricio Bergamini; Costa,Elaine Aparecida Dias da; Fernandes,Luciano Felício.

ABSTRACT Intensive growth of aquatic macrophytes interferes with water quality and ecosystem dynamics worldwide. Although mechanically removing macrophytes is the most commonly used method for their eradication, it can also cause undesirable disturbances in aquatic reservoir communities. We performed laboratory incubations of phytoplankton sampled before and after macrophytes were mechanically removed from the Piraquara II reservoir, South Brazil. We analyzed changes in growth and composition of the main phytoplankton groups with respect to nutrient shifting. Prior to removing the macrophytes, the phytoplankton community was dominated by low cell abundances of diatoms and flagellates. In contrast, growth rates of cyanobacteria (mainly Cylindrospermopsis...

Coscinodiscophyceae and Fragilariophyceae (Diatomeae) in the Iguaçu River, Paraná, Brazil

Palavras-chave: Chlorophytes; Cyanobacteria; Diatoms; Macrophytes; Mechanical removal; Phytoplankton; Reservoir management.

Ano: 2018

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400588

Acta Botanica

Nardelli,Margaret Seghetto; Bueno,Norma Catarina; Ludwig,Thelma Alvim Veiga; Tremarin,Priscila Izabel; Bartozek,Elaine Cristina Rodrigues.

A taxonomic survey was carried out on Coscinodiscophyceae and Fragilariophyceae found in the Iguaçu River catchment area within Iguaçu National Park, in the state of Paraná, Brazil. Between September 2007 and August 2008, we collected 24 samples from two stations on the Iguaçu River, upstream and downstream of the falls. We identified 37 taxa, including 22 specific and infraspecific taxa of Coscinodiscophyceae, together with 15 specific and infraspecific taxa of Fragilariophyceae. Melosira ruttneri Hustedt and Fragilaria alpestris Krasske ex Hustedt represent new records for Brazil.

The phytoplankton of Guanabara Bay, Brazil: I. historical account of its biodiversity

Palavras-chave: Diatoms; Lotic systems; Southern Brazil; Taxonomy.

Ano: 2014

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000100013

Villac,Maria Célia; Tenenbaum,Denise Rivera.

This is a historical account of the biodiversity of phytoplankton in Guanabara Bay, Brazil. It is based on 57 publications that refer to sampling carried out between 1913 and 2004. The publications included are those with direct microscopic identification. Although 80% of the studies focus on ecological issues that tend to mention only the most abundant species, 24 publications provide comprehensive check-lists at the species level, especially of taxa > 20 μm. The inventory of species includes, to date, 308 taxa among 199 diatoms, 90 dinoflagellates, 9 cyanobacteria, 5 euglenophyceans, 1 chlorophycean, 1 prasinophycean, 1 silicoflagellate, and 2 ebriids. The most conspicuous species were the dinoflagellate Scrippsiella trochoidea and diatoms from the...

Melosira (Diatomeae) taxa from the Iguaçu River in southern Brazil

Palavras-chave: Marine microalgae; Diatoms; Dinoflagellates; Cyanobacteria; Algal blooms.

Ano: 2010

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000200030

Nardelli,Margaret Seghetto; Tremarin,Priscila Izabel; Ludwig,Thelma Alvim Veiga; Bueno,Norma Catarina.

Abstract The study of the genus Melosira in plankton samples from the lower Iguaçu River revealed the presence of four taxa: Melosira undulata (Ehrenberg) Kützing var. undulata, M. undulata var. normanni Arnott, M. varians C. Agardh and M. muscigena Iwahashi. We present illustrations of the frustules using light microscopy (LM), descriptions, and comments about the morphology of the four taxa. The analysis of Melosira muscigena under scanning electron microscopy revealed unprecedented details of the ultrastructure, such as the shape and distribution of the rimoportulae at the valve mantle. This is the first record of Melosira undulata var. undulata and the second of M. muscigena in Brazil.

Gomphonema Ehrenberg (Bacillariophyceae, Gomphonemataceae) of the São Francisco Falso River, Paraná, Brazil

Palavras-chave: Diatoms; Southern Brazil; Taxonomy; Ultrastructure.

Ano: 2016

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000400202

Medeiros,Gabriela; Amaral,Mailor Wellinton Wedig; Ferreira,Paula Carolina; Ludwig,Thelma Veiga; Bueno,Norma Catarina.

Abstract: Gomphonema Ehrenberg is a genus well represented in periphytic algal flora of epicontinental environments. The substrate colonization is facilitated by the secretion of mucilage by the pore field, allowing cell adhesion. Samples were scraped off and analyzed from vegetative portions of the macrophyte Eichhornia azurea Kunth, collected in São Francisco Falso River, located in Santa Helena City, Paraná State. The sampling occurred in four different sites, in four different periods, totaling 16 samples. The quantitative material analysis resulted in 28 identified taxa, in which Gomphonema brasiliense ssp. pacificum, Gomphonema neoapiculatum Lange-Bertalot, Reichardt & Metzeltin Gomphonema pantropicum Reichardt and Gomphonema perapicatum...

The phytoplankton biodiversity of the coast of the state of São Paulo, Brazil

Palavras-chave: Lotic environment; Diatoms; Taxonomy; Ultrastructure.

Ano: 2018

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000300205

Villac,Maria Célia; Cabral-Noronha,Valéria Aparecida de Paula; Pinto,Thatiana de Oliveira.

The objective of this study is to compile the inventory of nearly 100 years of research about the phytoplankton species cited for the coast of the state of São Paulo, Brazil. A state-of-the-art study on the local biodiversity has long been needed to provide a baseline for future comparisons. This type of data is scattered in old scientific journals and in the so-called "grey literature", and are in need of nomenclature updating. Twenty-six publications are considered. The earliest sampling record is from 1913 (?) and the most recent from 2002. This checklist compiled from the literature was complemented with primary data collected between August 2004 and July 2006, recent surveys of the surf-zone of 20 beaches located along the coast and of a mariculture...

The genus Tryblionella W. Smith (Bacillariaceae, Bacillariophyta) in southern Brazil salt marshes

Palavras-chave: Marine microalgae; Inventory; Diatoms; Dinoflagellates.

Ano: 2008

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032008000300015

Bertolli,Lucielle Merlym; Talgatti,Dávia Marciana; Nascimento,Thamires Mariah da Silveira; Torgan,Lezilda Carvalho.

Abstract: Tryblionella is a large epipelic genus, widespread from fresh to marine waters. Most of the studies including the genus are based only in light microscopy. Few recent studies are exclusively dedicated to Tryblionella and the ultrastructure of some species is still little known. In this paper we present eleven species of Tryblionella found in epiphyton and microphytobenthos in Patos Lagoon salt marshes. All the species are described, illustrated in light and scanning electron microscopy and comments about their taxonomy, distribution and ecology are provided. Two taxa are reported for the first time in the State of Rio Grande do Sul and one in Southern Brazil. The number of species registered in this study comprises nearly a half of the number of...

Periphytic algae in a floodplain lake and river under low water conditions

Palavras-chave: Diatoms; Patos Lagoon; Periphyton; Taxonomy; Ultrastructure.

Ano: 2020

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032020000100204

Bichoff,Andressa; Osório,Nicolli Cristina; Dunck,Bárbara; Rodrigues,Liliana.

Abstract Drought events will become more frequent due the climate change. In floodplains, periphytic algae are responsible for part of the primary production, are the principal source of organic carbon deposition, play an important role in mineralization and nutrient cycling, and are the base of the food web for many organisms. As algae distribution in aquatic environments is a strong indicator of physical and chemical conditions of the sites, we aimed to determine the structure of periphytic algae in lentic and lotic environments during drought conditions and to uncover the main local abiotic factors in community structuring. We hypothesized diatoms would be more frequent than green algae and desmids at both sites, due to their resistance characteristics,...