
Barry H RosenFlorida Gulf Coast University | FGCU · Water School
Barry H Rosen
Ph. D.
About
121
Publications
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1,246
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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
October 2009 - present
June 2002 - July 2006
Publications
Publications (121)
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...
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...
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...
Another interesting find from the Everglades on Feb. 27, 2023
Two species of Gonyostomum in abundance from Feb 27, 2023 in the Everglades... high alkalinity.
The microscopic flora of the University Campus project
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...
The morphology of this organism is displayed: working on toxins and a refinement of its taxonomic placement via sequencing
The name given previously was incorrect. Find the correct name on this organism
Unusual find and no apparent name fits. Motile (only 1 visible flagellum) and stigma
A very nice find today.
Abundant and distinct epiphytic cyanobacterium
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
Rather a large number of this species was found in an Everglades sample I am culturing
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...
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...
An interesting terminal cell upon maturation
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...
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.
Images of Tychonema, a cyanobacteria collected from Zion National Park, that has been implicated in a dog death
Tentatively ID as Tychonema
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).
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,...
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...
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...
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.
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...
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...
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...
In my laboratory, calcium carbonate glows white when illuminated with UV via epifluorescent
microscopy.
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...
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...
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...
Microcystin concentrations (μg L-1).
(XLSX)
Cell density (cells mL-1).
(XLSX)
Dissolved nutrient concentration (μM) and ratio.
(XLSX)
Microcystin concentrations (μg L-1).
(XLSX)
September 2016 diatom, cyanobacteria, and green algal pigment concentrations (μg L-1) from all transect sites.
(XLSX)
Chlorophyll a data (μg L-1) at 24 and 72 h from the September 2016 nutrient amendment experiment.
(XLSX)
Specific growth rate data (day-1) at 24 and 72 h from the September 2016 nutrient amendment experiment.
(XLSX)
Regression of total nitrogen concentrations (μM), total microcystin concentrations (μg L-1) and mcyE gene abundances (copies mL-1) during the July transect.
(XLSX)
Total nutrient concentration (μM) and ratio.
(XLSX)
Chlorophyll a concentrations (μg L-1).
(XLSX)
Cell density (cells mL-1).
(XLSX)
McyE and sxtA gene abundances (copies mL-1) at sites along the July 2016 transect.
(XLSX)
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)
Chlorophyll a concentrations (μg L-1).
(XLSX)
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)
Total nutrient concentration (μM) and ratio.
(XLSX)
Dissolved nutrient concentration (μM) and ratio.
(XLSX)
Diatom, cyanobacteria, and green algal pigment concentrations (μg L-1) at 48 h from the September 2016 nutrient amendment experiment.
(XLSX)
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.
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...
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...
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...
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...
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...
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...
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...
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...
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)...
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...
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...
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...
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...
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...
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)
I want to watch the transition of the cells having beta carotene to astaxanthin with various manipulations.