Barry H Rosen

Barry H Rosen
Florida Gulf Coast University | FGCU · Water School

Ph. D.

About

121
Publications
23,321
Reads
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1,246
Citations
Introduction
I'm all about cyanobacteria, especially when and why the form a bloom, what toxin they have the ability to make and getting the best images of species.
Additional affiliations
May 1986 - July 1987
University of Nebraska–Lincoln
Position
  • PostDoc Position
Description
  • Biofuels from algae
October 2009 - present
United States Geological Survey
Position
  • Biologist
June 2002 - July 2006
U.S. Fish and Wildlife Service
Position
  • Research Assistant

Publications

Publications (121)
Article
Full-text available
Harmful algal blooms caused by cyanobacteria threaten aquatic ecosystems, the economy, and human health. Previous work has tried to identify the mechanisms that allow blooms to form, focusing on the role of nutrients. However, little is known about how introduced nutrients influence gene expression in situ. To address this knowledge gap, we used in...
Article
Full-text available
The occurrence of cyanobacterial harmful algal blooms (cyanoHABs) is related to their physical and chemical environment. However, less is known about their associated microbial interactions and processes. In this study, cyanoHABs were analyzed as a microbial ecosystem, using 1 year of 16S rRNA sequencing and 70 metagenomes collected during the bloo...
Article
Full-text available
Cyanobacteria are the most common toxigenic algae in inland waters. Their toxins can affect the health of aquatic and terrestrial organisms, including humans. Other algal groups, such as haptophytes (e.g., Prymnesium parvum) and euglenoids (e.g., Euglena sanguinea), can also form harmful algal blooms (HABs) whose toxins cause injury to aquatic biot...
Data
Another interesting find from the Everglades on Feb. 27, 2023
Data
Two species of Gonyostomum in abundance from Feb 27, 2023 in the Everglades... high alkalinity.
Data
The microscopic flora of the University Campus project
Article
Full-text available
Algal blooms around the world are increasing in frequency and severity, often with the possibility of adverse effects on human and ecosystem health. The health and economic impacts associated with harmful algal blooms, or HABs, provide compelling rationale for developing new methods for monitoring these events via remote sensing. Although concentra...
Data
The morphology of this organism is displayed: working on toxins and a refinement of its taxonomic placement via sequencing
Data
Lake Trafford, Florida
Data
Another find from the calcium-rich Everglades
Data
Another from the Everglades attached to Typha
Data
Interesting flagellate
Data
The name given previously was incorrect. Find the correct name on this organism
Data
Another Everglades find on Typha (cattail)
Data
Unusual find and no apparent name fits. Motile (only 1 visible flagellum) and stigma
Data
photo-documentation of this species
Data
A very dense bloom in October, 2021
Data
Abundant and distinct epiphytic cyanobacterium
Data
From a drinking water basin in Washington state
Data
Rodeo Lagoon, CA 10-14-21
Presentation
Full-text available
This filamentous branched green came with some Typha stems from the Everglades. I should know in a few weeks if I have it alone in culture
Data
Rather a large number of this species was found in an Everglades sample I am culturing
Data
This U.S. Geological Survey (USGS) Data Release provides phytoplankton data for samples collected from eleven large river sites throughout the United States, from June through October 2018. All data are reported as raw calculated values and are not rounded to USGS significant figures. The dataset includes all routine and quality assurance/quality c...
Data
This U.S. Geological Survey (USGS) data release provides discretely measured cyanotoxin, chlorophyll-a, and cyanobacterial toxin genetic data for samples collected from eleven large river sites throughout the United States, from June through October 2018. Discrete water-quality samples were analyzed for cyanotoxins (anatoxin, cylindrospermopsin, mi...
Data
Always fun finding and photographing algae
Data
Project to capture images of the Cyanobacteria of North America
Data
An interesting terminal cell upon maturation
Article
Full-text available
Abstract: Lake Okeechobee is one of the largest freshwater lakes in the United States. As a eutrophic lake, it has frequent algal blooms composed predominantly of the cyanobacterium genus Micro-cystis. Many of the algal blooms are associated with the resuspension of a thixotropic benthic mud containing legacy nutrients. Since Lake Okeechobee has an...
Article
Full-text available
We report the first complete genome of Microcystis aeruginosa from North America. A harmful bloom that occurred in the Caloosahatchee River in 2018 led to a state of emergency declaration in Florida. Although strain FD4 was isolated from this toxic bloom, the genome did not have a microcystin biosynthetic gene cluster.
Data
Tropical Cyanobacteria
Experiment Findings
Full-text available
Presentation
Full-text available
Morphology - Genetics to come
Experiment Findings
Full-text available
Data
Images of Tychonema, a cyanobacteria collected from Zion National Park, that has been implicated in a dog death
Data
Entomoneis ornata sparked my interest while working with Rex Lowe, initially from and epipelic community in northern Michigan. Charlie Reimer was kind enough to give us a sample with two other species (E. paludosa and E. alata). Please find scanned SEM and TEM images of these species, unpublished at this point (glad to collaborate with someone).
Technical Report
Full-text available
The primary objective of this study is to characterize water-quality conditions and bed-sediment chemistry in the vicinity of the planned Mid-Currituck Bridge, providing a baseline for evaluating the potential effects of bridge construction and bridge deck runoff on environmental conditions in Currituck Sound. From August 2011 through January 2018,...
Poster
Full-text available
Cyanobacteria are a diverse and widespread group of microorganisms. An overgrowth of these organisms limits recreational use of water resources and negatively impacts aquatic ecosystems. Moreover, some cyanobacteria can produce toxins, causing additional problems for human and animal health. Lake Okeechobee, the second largest freshwater lake withi...
Article
Full-text available
Cyanotoxins occur in rivers worldwide but are understudied in lotic ecosystems relative to lakes and reservoirs. We sampled 11 large river sites located throughout the United States during June-September 2017 to determine the occurrence of cyanobacteria with known cyanotoxin-producing strains, cyanotoxin synthetase genes, and cyanotoxins. Chlorophy...
Conference Paper
Full-text available
Seventy-five researchers from around the state and across the country attended this science symposium to discuss the current state of knowledge and recommend research priorities to improve levels of certainty regarding HABs in Florida.
Chapter
This article provides an introduction to freshwater cyanobacterial blooms, including a brief discussion of those formed by eukaryotic algae. In freshwater systems, cyanobacteria have ecological strategies such as buoyancy regulation, phosphorus mining, and nitrogen fixation that give them a competitive advantage over eukaryotic algae, and they caus...
Chapter
Full-text available
This article provides an introduction to freshwater cyanobacterial blooms, including a brief discussion of those formed by eukaryotic algae. In freshwater systems, cyanobacteria have ecological strategies such as buoyancy regulation, phosphorus mining, and nitrogen fixation that give them a competitive advantage over eukaryotic algae, and they caus...
Book
Full-text available
The Arthur R. Marshall Loxahatchee National Wildlife Refuge (refuge), Boynton Beach, Florida, contains approximately 147,000 acres southeast of Lake Okeechobee. Water quality in the interior portion of the refuge is strongly influenced by rainfall, resulting in slightly acidic waters with low dissolved ions. Desmids, a unique, ornate group of green...
Data
In my laboratory, calcium carbonate glows white when illuminated with UV via epifluorescent microscopy.
Article
Full-text available
Cyanobacterial blooms are a nuisance and a potential hazard in freshwater systems worldwide. Remote sensing has been used to detect cyanobacterial blooms, but few studies have distinguished among genera of cyanobacteria. Because some genera are more likely to be toxic than others, this is a useful distinction. Hyperspectral imaging reflectance micr...
Article
Full-text available
In an effort to simulate the survival of cyanobacteria as they are transported from Lake Okeechobee to the estuarine habitats that receive waters from the lake, a bioassay encompassing a range of salinities was performed. An overall decline in cyanobacteria health in salinity treatments greater than 18 practical salinity units (psu) was indicated b...
Article
Full-text available
Lake Okeechobee, FL, USA, has been subjected to intensifying cyanobacterial blooms that can spread to the adjacent St. Lucie River and Estuary via natural and anthropogenically-induced flooding events. In July 2016, a large, toxic cyanobacterial bloom occurred in Lake Okeechobee and throughout the St. Lucie River and Estuary, leading Florida to dec...
Data
Microcystin concentrations (μg L-1). (XLSX)
Data
Dissolved nutrient concentration (μM) and ratio. (XLSX)
Data
Microcystin concentrations (μg L-1). (XLSX)
Data
September 2016 diatom, cyanobacteria, and green algal pigment concentrations (μg L-1) from all transect sites. (XLSX)
Data
Chlorophyll a data (μg L-1) at 24 and 72 h from the September 2016 nutrient amendment experiment. (XLSX)
Data
Specific growth rate data (day-1) at 24 and 72 h from the September 2016 nutrient amendment experiment. (XLSX)
Data
Regression of total nitrogen concentrations (μM), total microcystin concentrations (μg L-1) and mcyE gene abundances (copies mL-1) during the July transect. (XLSX)
Data
Total nutrient concentration (μM) and ratio. (XLSX)
Data
Chlorophyll a concentrations (μg L-1). (XLSX)
Data
McyE and sxtA gene abundances (copies mL-1) at sites along the July 2016 transect. (XLSX)
Data
Chlorophyll a data (μg L-1) from July 2016 24 h nutrient amendment experiments from samples collected from sites LO 1, SLE 1, SLE 6.5, and SLE 10. (XLSX)
Data
Chlorophyll a concentrations (μg L-1). (XLSX)
Data
Specific growth rate data (day-1) from July 2016 24 h nutrient amendment experiments from samples collected from sites LO 1, SLE 1, SLE 6.5, and SLE 10. (XLSX)
Data
Total nutrient concentration (μM) and ratio. (XLSX)
Data
Dissolved nutrient concentration (μM) and ratio. (XLSX)
Data
Diatom, cyanobacteria, and green algal pigment concentrations (μg L-1) at 48 h from the September 2016 nutrient amendment experiment. (XLSX)
Research
Full-text available
This filamentous cyanobacteria has very unusual cell shapes. Heterocytes and aerotopes are present. Found in many locations this past summer and close to being an isolate in my culture collection.
Article
Full-text available
The Lake Okeechobee and the Okeechobee Waterway (Lake Okeechobee, the St. Lucie Canal and River, and the Caloosahatchee River) experienced an extensive harmful algal bloom within Lake Okeechobee, the St. Lucie Canal and River and the Caloosahatchee River in 2016. In addition to the very visible bloom of the cyanobacterium Microcystis aeruginosa, se...
Chapter
Full-text available
The microscopic organisms of the Everglades include numerous prokaryotic organisms, including the eubacteria, such as the cyanobacteria and nonphotosynthetic bacteria, as as several eukaryotic algae and protozoa that form the base of the food web. This report is part 1 in a series of reports that describe microscopic organisms encountered during th...
Technical Report
Full-text available
Cyanobacteria can produce toxins and form harmful algal blooms. The Native American and Alaska Native communities that are dependent on subsistence fishing have an increased risk of exposure to these cyanotoxins. It is important to recognize the presence of an algal bloom in a waterbody and to distinguish a potentially toxic harmful algal bloom fro...
Article
Full-text available
There is a broad scientific consensus that amyotrophic lateral sclerosis (ALS) is caused by gene-environment interactions. Mutations in genes underlying familial ALS (fALS) have been discovered in only 5-10% of the total population of ALS patients. Relatively little attention has been paid to environmental and lifestyle factors that may trigger the...
Chapter
Bacteria are so widespread that only the most general statements can be made about their life history and ecology. They are everywhere on the earth, even in the most hostile environments, including extremes of temperature, such as freshwater hot springs. Many live in water; however, they are also an important part of soils and live in and on plants...
Article
Photosynthetic characteristics and chloroplast ultrastructure of Cyclotella meneghiniana Kütz. were quantified while the organism was simultaneously adjusting to light and nutrient stress. Cells were grown in batch culture at either low or high light intensity on medium with a nitrogen/phosphorus molar ratio of 2:1 as a control, or with nitrogen or...
Chapter
Full-text available
Cyanobacteria are common in the plankton of most lakes, including Lake Champlain. Certain species of cyanobacteria can produce toxins that are harmful to people and their pets. In 2000 and 2001, we examined the occurrence of potential toxin-producing species of cyanobacteria in Lake Champlain. Samples were collected from locations throughout the la...
Article
The hydroscape of south Florida has been severely altered over the past 50 y by the construction of canals, drainage ditches, levees, water control structures, and pump stations. This alteration has included, in part, channelization of the Kissimmee River, construction of a dike around Lake Okeechobee, increased ditching of pastures for drainage th...
Article
Uptake rates for ananonium, nitrate, urea and dinitrogen by phytoplankton in Lake Okeechobee ranged from 0.58 to 1.52 μmol 1−1 h−1 among four representative stations during a short-term study period. Ammonium accounted for 53% of the uptake rates, followed by nitrate (19%), urea (16%) and dinitrogen (12%). Half-saturation constants for nitrogen (N)...
Article
The U.S. Environmental Protection Agency's (EPA's), Environmental Monitoring and Assessment Program (EMAP) is developing a landscape-level conceptual model to evaluate the condition of depressional (basin-type) wetlands in the prairie pothole region (PPR) of the United States. This effort is underway to determine the current condition of the Nation...
Article
Growth and production of 2-methylisoborneol (MIB) was characterized in the cyanobacterium Phormidium sp. LM689 isolated from Lake Mathews, California, USA. The effects of: 1) uptake of several organic amendments related to pigment biosynthesis, 2) Fe availability, and 3) copper algicides were examined. Growth was estimated by total chlorophyll and...
Article
Limited diversity was found among cyanobionts from a cultivated population of cycads at a field site in Florida. All isolates were classified as Nostoc but were different from the one Nostoc species found in the soil. These cyanobacteria were root endophytes of several plants of Zamia integrifolia and one of Dioon. The isolates were similar morphol...
Article
Anabaena circinalis (Kutz.) Rabenhorst was isolated during a taste and odor episode characterized by high concentrations of geosmin, with raw water containing up to 45 ng geosmin/L. This species has been successfully cultured with sustained geosmin synthesis on both sterile river water and defined medium. Gas chromatography of cellular extracts and...
Data
The organisms and processes supported by the coastal areas are critical to the balance of the entire ocean system. Understanding the influence of human activity on these critical coastal areas is imperative in view of the current rate of degradation evident from a variety of perspectives. Wastewater effluent from publicly-owned treatment works (POT...
Book
Full-text available
Article
S ummary A number of cyanobacterial strains from the Azolla Lam. symbiosis, all independently isolated by different researchers, were simultaneously evaluated in order to document distinguishing traits. Ten presumptive secondary (minor) cyanobionts from Azolla were identified by genus and compared by morphology, binding to FITC‐conjugated lectins,...

Questions

Question (1)
Question
I want to watch the transition of the cells having beta carotene to astaxanthin with various manipulations.

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