A5067265369- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Protist diversity and phylogeny
- Marine Biology and Ecology Research
- Food Industry and Aquatic Biology
- Atmospheric and Environmental Gas Dynamics
- Marine Toxins and Detection Methods
- Atmospheric Ozone and Climate
- Underwater Vehicles and Communication Systems
- Methane Hydrates and Related Phenomena
- Aquatic Ecosystems and Phytoplankton Dynamics
- Water Quality Monitoring Technologies
- Genomics and Phylogenetic Studies
- Isotope Analysis in Ecology
- Oceanographic and Atmospheric Processes
- Environmental DNA in Biodiversity Studies
- Geology and Paleoclimatology Research
- Marine Bivalve and Aquaculture Studies
- Maritime Navigation and Safety
- Ocean Acidification Effects and Responses
- Marine and fisheries research
- Algal biology and biofuel production
- Fish Ecology and Management Studies
- Water Quality Monitoring and Analysis
- Robotic Path Planning Algorithms
University of Southern California
2016-2025
Southern California University for Professional Studies
2011-2025
University of Michigan
2023
Aquatic Systems (United States)
2022
Centre Hospitalier de l’Université de Montréal
2021
University of California, Santa Cruz
2019
Woods Hole Oceanographic Institution
1994-2018
Texas A&M University
2018
Mitchell Institute
2018
University of California, Los Angeles
2018
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.
Natural assemblages of marine bacteria were cultured on combinations C and N sources (amino acids, glucose, NH 4 + ) to span a range substrate : ratios from 1.5 1 10 1. Catabolic metabolism the component amino acid substrates led regeneration during exponential growth. The efficiency this ( R also carbon gross growth (GGE) generally was independent N, but increased as ratio (C S decreased relative bacterial biomass B ). elemental chemical composition P ratio) relatively invariant at about 45...
Mixotrophs are important components of the bacterioplankton, phytoplankton, microzooplankton, and (sometimes) zooplankton in coastal oceanic waters. Bacterivory among phytoplankton may be for alleviating inorganic nutrient stress increase primary production oligotrophic Mixotrophic phytoflagellates dinoflagellates often dominant plankton during seasonal stratification. Many microzooplankton grazers, including ciliates Rhizaria, mixotrophic owing to their retention functional algal organelles...
A new method is described that uses the fluorochrome primulin and epifluorescence microscopy for enumeration of heterotrophic phototrophic nanoplankton (2 to 20 μm). Phototrophic microorganisms are distinguished from heterotrophs by red autofluorescence chlorophyll a . Separate filter sets used which allow visualization primulin-stained without masking fluorescence, thus allowing easy recognition cells. Comparison with existing techniques counting shows provides more accurate counts these...
Literature review and synthesis of growth rates aquatic protists focused on the role temperature in formation massive annual algal blooms high‐latitude ecosystems. Maximal herbivorous equaled or exceeded maximal phototrophic at temperatures above 15°C. declined more rapidly with decreasing than did those protists, very low common to ecosystems, were less half protists. Growth consistently lower bacterivorous unrelated differences cell volume between two groups. Linear equations describing...
Arranging organisms into functional groups aids ecological research by grouping (irrespective of phylogenetic origin) that interact with environmental factors in similar ways. Planktonic protists traditionally have been split between photoautotrophic “phytoplankton” and phagotrophic “microzooplankton”. However, there is a growing recognition the importance mixotrophy euphotic aquatic systems, where many often combine modes nutrition. Such do not align traditional dichotomy phytoplankton...
Sinking particles are a critical conduit for the export of organic material from surface waters to deep ocean. Despite their importance in oceanic carbon cycling and export, little is known about biotic composition, origins, variability sinking reaching abyssal depths. Here, we analyzed particle-associated nucleic acids captured preserved sediment traps at 4,000-m depth North Pacific Subtropical Gyre. Over 9-month time-series, Bacteria dominated both rRNA-gene rRNA pools, followed by...
Protist plankton are major members of open-water marine food webs. Traditionally divided between phototrophic phytoplankton and phagotrophic zooplankton, recent research shows many actually combine phototrophy phagotrophy in the one cell; these protists "mixoplankton." Under mixoplankton paradigm, "phytoplankton" incapable (diatoms being exemplars), while "zooplankton" phototrophy. This revision restructures webs, from regional to global levels. Here, we present first comprehensive database...
The Pseudomonas aeruginosa mutant Z61 has been shown to be highly supersusceptible a wide range of antibiotics, including beta-lactams, aminoglycosides, rifampin, tetracycline, and chloramphenicol (W. Zimmerman, Int. J. Clin. Pharmacol. Biopharm. 17:131-134, 1979). Spontaneous revertants were isolated, using gentamicin or carbenicillin as selective agents, have two patterns susceptibility group 12 antibiotics. Partial had 2- 10-fold greater resistance these antibiotics than Z61, whereas full...
Oceanic macroaggregates (marine snow and Rhizosolenia mats) sampled from the Sargasso Sea are associated with bacterial protozoan populations up to four orders of magnitude greater than those present in samples surrounding water. Filamentous, curved, spiral bacteria constituted a higher proportion particles were found among Protozoan dominated numerically by heterotrophic microflagellates, but ciliates amoebas also observed. Macroaggregates highly enriched microenvironments oceans may be...
Path planning and trajectory design for autonomous underwater vehicles (AUVs) is of great importance to the oceanographic research community because automated data collection becoming more prevalent. Intelligent required maneuver a vehicle high-valued locations perform collection. In this paper, we present algorithms that determine paths AUVs track evolving features interest in ocean by considering output predictive models. While traversing computed path, provides near-real-time, situ...
Abstract. Cloning/sequencing and fragment analysis of ribosomal RNA genes (rDNA) are becoming increasingly common methods for the identification microbial taxa. Sequences these provide many additional taxonomic characters species that otherwise have few distinctive morphological features, or require involved microscopy laboratory culture testing. These same approaches now being applied with great success in ecological studies natural communities microorganisms. Extensive information on...
Macroscopic detrital aggregates, known as marine snow, are a ubiquitous and abundant component of the pelagic zone. Descriptions microbial communities occurring at densities 2–5 orders magnitude higher on these particles than in surrounding seawater have led to suggestion that snow may be site intense heterotrophic activity. We tested this hypothesis using incorporation [ 3 H]thymidine into macromolecules measure bacterial growth from oceanic waters North Atlantic neritic off southern...
Some members of the diatom genus Pseudo‐nitzschia produce toxin domoic acid (DA), which through trophic transfer causes mass mortalities wildlife, shellfish harvesting closures, and risks to human health. Nutrient micronutrient limitation have been shown regulate DA production. This study tested hypothesis that changing partial pressure CO 2 ( p ) can interact with nutrient help determine cellular levels, an environmentally relevant issue in light current increases atmospheric . Cultures...
ABSTRACT DNA sequence information has increasingly been used in ecological research on microbial eukaryotes. Sequence-based approaches have included studies of the total diversity selected ecosystems, autecology ecologically relevant species, and identification enumeration species interest for human health. It is still uncommon, however, to delineate protistan based their genetic signatures. The reluctance assign species-level designations sequences part a consequence limited amount...