A5030244423- Diatoms and Algae Research
- Genomics and Phylogenetic Studies
- Microbial Community Ecology and Physiology
- Marine and coastal ecosystems
- Paleontology and Stratigraphy of Fossils
- Protist diversity and phylogeny
- Aquatic Invertebrate Ecology and Behavior
- Aquatic Ecosystems and Phytoplankton Dynamics
- Geology and Paleoclimatology Research
- Marine Biology and Ecology Research
- Plant Diversity and Evolution
- Water Quality Monitoring and Analysis
- Algal biology and biofuel production
- Environmental DNA in Biodiversity Studies
- Analytical chemistry methods development
- Identification and Quantification in Food
- Marine and coastal plant biology
- Paleontology and Evolutionary Biology
- Freshwater macroinvertebrate diversity and ecology
- Evolution and Paleontology Studies
- Isotope Analysis in Ecology
- Soil and Water Nutrient Dynamics
- Fish biology, ecology, and behavior
- Marine Biology and Environmental Chemistry
- Morphological variations and asymmetry
The University of Texas at Austin
2013-2023
Montana State University
2018
University of Nebraska–Lincoln
2018
Louisiana State University
1989-1994
Smithsonian Institution
1994
Pennsylvania Academy of Science
1990-1994
University of Tulsa
1994
Jefferson Institute
1994
Drexel University
1994
Buffalo State University
1994
Current sampling of genomic sequence data from eukaryotes is relatively poor, biased, and inadequate to address important questions about their biology, evolution, ecology; this Community Page describes a resource 700 transcriptomes marine microbial help understand role in the world's oceans.
Marine diatoms are shown to have on average one order of magnitude less silica per unit biovolume than freshwater species. Silica content (pmol cell −1 ) increases linearly with ( µ m 3 in both marine (1og 10 [silica content] = 0.91 log [biovolume] — 3.16; r 0.92; P < 0.0001; N 44) and (log 1.03 1og 2.45; 0.91; 62). Therefore, a first#x2010;order estimate the amount utilized by diatom production can be made from biovolumes. Si: C molar ratios for also different demonstrate that...
Resource‐based physiology of the eight important planktonic diatom species in large lakes Yellowstone region can be used to explain their relative abundances and seasonal changes. The diatoms are ranked along resource ratio gradients according abilities grow under limitation by Si, N, P, light. Hypotheses based on integrated with observations changes assemblages present distributions test causal factors proposed over Holocene. Knowledge limnology these process‐oriented provide basis for a...
1Texas Natural Science Center, 2400 Trinity Street, University of Texas, Austin TX 78619, U.S.A. 2Section Integrative Biology, The Texas at Austin, 1 Station (A6700), 78712, 3Plant Biology Graduate Program, 4Institute Cellular and Molecular *Author for correspondence: etheriot@austin.utexas.edu
We assessed phytoplankton dynamics in three lakes the Greater Yellowstone Ecosystem to better understand connections between changing environmental conditions and aquatic communities. This work primarily describes resource availability seasonal succession these lakes. hypothesized that algal species efficient at utilizing a given (including N, P, Si, light) would be correlated with low relative concentrations of those resources. The generally exhibited moderate limitation, which is...
Publication of the first diatom genome, that Thalassiosira pseudonana, established it as a model species for experimental and genomic studies diatoms. Virtually every ensuing study has treated T. pseudonana marine diatom, with data valued their insights into ecology evolution diatoms in world's oceans. The natural distribution spans both fresh waters, phylogenetic analyses morphological molecular datasets show that, 1) marks an early divergence major freshwater radiation by diatoms, 2)...
ABSTRACT Cladistic analysis of nuclear‐encoded rRNA sequence data provided us with the basis for some new hypotheses relationships within green algal class Ulvophyceae. The orders Ulotrichales and Ulvales are separated from clade formed by remaining siphonous siphonocladous Ulvophyceae (Caulerpales, Siphonocladales /Cladophorales [S/C] complex, Dasycladales), Chlorophyceae Pleurastrophyceae. Our results suggest that is not a monophyletic group. Examination inter‐ intra‐ordinal ulvophycean...
Empirical comparison of species concepts can be made by taking advantage a common operational exigency: the use phenotypically irreducible clusters individuals as first order estimates species. A phylogenetic analysis diatoms was undertaken using such terminal taxa. Cladistic and biogeographic distributions suggest that different populations widespread, plesiomorphic Stephanodiscus niagarae (at least 2 million years old) are ancestral to three autapomorphic taxa emerged during Holocene in...
A recent reclassification of diatoms based on phylogenies recovered using the nuclear-encoded SSU rRNA gene contains three major classes, Coscinodiscophyceae, Mediophyceae and Bacillariophyceae (the CMB hypothesis). We evaluated this with a sequence alignment 1336 protist heterokont algae rRNAs, which includes 673 diatoms. Sequences were aligned to maintain structural elements conserved within dataset. Parsimony analysis rejected hypothesis, albeit weakly. Morphological data are also...
Photosynthesis by diatoms accounts for roughly one-fifth of global primary production, but despite this, relatively little is known about their plastid genomes. We report the completely sequenced genomes eight phylogenetically diverse and show them to be variable in size, gene foreign sequence content, order. The contain a core set 122 protein-coding genes, with 15 additional genes exhibiting complex patterns 1) losses at varying phylogenetic scales, 2) functional transfers nucleus, 3)...
:We reconstructed the phylogeny of representatives from nine genera and three families Cymbellales using two nuclear chloroplast genes. After rooting with Anomoeoneis, Placoneis was found as sister to a clade composed Cymbella, Cymbopleura, Encyonema, Gomphonema, Gomphoneis. The latter group divided into lineages mainly heteropolar dorsiventral valve symmetry. data morphology also supported close relationship between Geissleria decussis Placoneis. Expectedly, sequenced genes exhibited...
Cyclotella is a commonly encountered name in the diatom literature. The attached, however, to historically vaguely defined and polyphyletic genus whose taxonomy systematics remain muddled despite numerous taxonomic treatments. One recent chapter this history concerns species informally known as “Cyclotella comta” group, which have one or more rimoportulae on valve face. These were grouped into new genus, Puncticulata, that has been applied inconsistently since its introduction. Puncticulata...
ABSTRACT Partial sequences from the nuclear‐encoded 18S and 26S ribosomal RNA molecules representatives of five classes Chlorophyta sensu Mattox Stewart (1984) were analyzed cladistically in a study phylogenetic relationships among Micromonadophyceae, Pleurastrophyceae, other green algae. The sequence data indicate that Micromonadophyceae (= Prasinophyceae) is not monophyletic but comprises at least three lineages occupying basal position Though Pleurastrophyceae Ulvophyceae both possess...
Neogene and Quaternary lacustrine diatomaceous deposits are numerous in the western United States, particularly Great Basin.Some of these sediments interbedded with volcanic rocks that have been dated radiometrically or by fssion track method.Fossil diatom floras can thus be arranged geochronological order.By this means, a biochronological pattern evolution has emerged: obligate nonmarine Actinocyclus Ehrenberg (Family Hemidiscaceae) appeared early Miocene attained maximum diversity middle...
It is difficult to delineate Cyclotella, Cyclostephanos and Stephanodiscus—the three most taxonomically diverse, predominantly freshwater genera of the Thalassiosiraceae. was originally distinguished by a Stephanodiscus-like exterior fasciculate striae raised radiating costae, Cyclotella-like interior, with chambers near margin. After creation Cyclostephanos, Cyclotella Stephanodiscus were each diagnosed absence characters. However, this study suggests that species can be classified on basis...