Over the past two decades, molecular phylogenetic data have allowed evaluations of hypotheses on the evolution of green algae based on vegetative morphological and ultrastructural characters. Higher taxa are now generally recognized on the basis of…
Algology
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7,027 papers
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Rhodoliths (maerl) are widely distributed in the worlds' oceans and have an excellent fossil record. Individuals are slow growing, may be long lived 100 years), and are resilient to a variety of environmental disturbances. Their external morphology…
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Structural analysis of G-protein-coupled receptors (GPCRs) for hormones and neurotransmitters has been hindered by their low natural abundance, inherent structural flexibility, and instability in detergent solutions. Here we report a structure of…
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Maerl is a general term used for loose-lying subtidal beds of nodular coralline red algae. Maerl beds support high associated invertebrate and algal biodiversity, and are subject to European and UK conservation legislation. Previous investigations…
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The foremost feature of a diatom is the species-specific ornamentation of the silicon cell wall, which is preserved and faithfully reproduced through the generations. If exposed to different kinds of stress during reproductive processes, the diatom…
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The epilithic diatom assemblages studied in the high mountain lake La Caldera (Granada, Spain) from 1996 to 1998 went through two clearly different stages. The initial one, in 1996, corresponded to the reflooding of the basin after a severe drought…
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1. We quantified the relationships between diatom relative abundance and water conductivity and ionic composition, using a dataset of 3239 benthic diatom samples collected from 1109 river sites throughout the U.S.A. U.S. Geological Survey National…
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1. Rhodolith beds, unattached coralline reefs, support a high diversity and abundance of marine species from both hard and soft benthos. We used surveys in multiple shallow (3-20m) beds in the Gulf of California to (1) examine seasonal patterns in…
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Two new species of Fragilariforma, F. cassieae sp. nov. and F. rakiuriensis sp. nov., are described from material from New Zealand, with reference to populations found in Australia. The new species are similar in shape and size to Fragil- ariforma…
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Research policies ensuing from the Convention on Biological Diversity made huge funds available to study biodiversity. These were mostly dedicated to projects aimed at providing services to taxonomy via information and technology, or to develop…
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The rivers and streams of the Pampean plain are subjected to the impact of agriculture, cattle-raising and industrial activities. The largest urban center of Argentina is located here. The most important stresses on rivers and streams in the Pampean…
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This revision of the classification of unicellular eukaryotes updates that of Levine et al. (1980) for the protozoa and expands it to include other protists. Whereas the previous revision was primarily to incorporate the results of ultrastructural…
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En grandes zonas de la plataforma continental brasileña, los rodolitos de algas coralinas proveen hábitats de gran diversidad. Para entender el papel de los rodolitos en la estructura de la infauna, poco estudiada en estos hábitats, se describen las…
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Question is the identity of the (ie flagellate role in the radiation of the lineage, a to well-organized colonies to complex plants
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The role of macroinvertebrates and diatoms as indicator for metal pollution was investigated by assessing both biota along a metal gradient in the Belgian river the Dommel. Macroinvertebrates and diatoms were sampled in summer and winter and…
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Diatom, chrysophyte cyst, benthic cladocera, planktonic cladocera, and chironomid assemblages were studied in the surface sediments of 68 small lakes along an altitudinal gradient from 300 to 2350 m in Switzerland. In addition, 43 environmental…
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A combined mineral magnetic and scaled chrysophyte study of lake sediments from Lake Lacawac and Lake Giles in northeastern Pennsylvania was conducted to determine the effects of land-use and sediment source changes on the variation of pH,…
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The genera Planktothrix and Planktothricoides planktic filamentous phormidiacean types. They are well characterized and delimited by phenotype, ultrastructure, and mainly by genetic criteria (molecular sequencing). However, their intrageneric…
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Assistant ProfessorFCUL - Faculdade de Ciências da Universidade de Lisboa -
Ph.D. StudentSão Paulo, Brazil -
Doctoral StudentPorto Alegre, Brazil
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Student (Bachelor)Stazione Zoologica Anton Dohrn -
Ph.D. Student