# overview
Why is it that so many microscopic organisms can be found in a single drop of water?  And how is it that these minute species can shape entire ecosystems?  How might our knowledge of ecological principals governing these microbes be used to protect our living natural resources?  Teaching and Research in the Roelke Lab addresses these questions.  Understanding lower foodweb dynamics of aquatic ecosystems with an emphasis on interactions between biota and the physicochemical environment is the focus of much of this research.

# keywords[]
4012 Fluid Mechanics And Thermal Engineering

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30 Agricultural, Veterinary And Food Sciences

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Principal Coordinates Of Neighbour Matrices

# educationAndTraining[].organization.label
Texas A&M University - (College Station, Texas, United States)

# awardsAndHonors[].label
Wildlife and Fisheries Sciences Ã¢â‚¬Å“Outstanding Graduate TeachingÃ¢â‚¬Â Award

# publications[].label
Seasonally variable riverine production in the Venezuelan llanos

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The potential algaecide flumioxazin has little effect on growth, survival and feed conversion of the bluegill sunfish Lepomis macrochirus

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Fundamental predictability in multispecies competition: the influence of large disturbance.

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Terrestrial dissolved organic carbon subsidizes estuarine zooplankton: An in situ mesocosm study

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AUXOSPORE FORMATION IN AN ANTARCTIC CLONE OF NITZSCHIA SUBCURVATA HASLE

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Anticipated human population and climate change effects on algal blooms of a toxic haptophyte in the south-central USA

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Dynamics of phytoplankton succession coupled to species diversity as a system-level tool for study of Microcystis population dynamics in eutrophic lakes

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Analyzing the (mis)behavior of Shannon index in eutrophication studies using field and simulated phytoplankton assemblages

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Spatial averaging and disturbance lead to high productivity in aquatic metacommunities

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Allelopathy and micropredation paradigms reconcile with system stoichiometry

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A chemical approach for the mitigation of Prymnesium parvum blooms.

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Pulsing hydrology determines top-down control of basal resources in a tropical river-floodplain ecosystem

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9.11 Hypoxia in Waters of the Coastal Zone Causes, Effects, and Modeling Approaches*

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Spatial variation of harmful algae and their toxins in flowing-water habitats: a theoretical exploration

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Nutrient and phytoplankton dynamics in a sewage-impacted gulf coast estuary: A field test of the PEG-model and Equilibrium Resource Competition theory

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Integrating Agriculture and Ecosystems to Find Suitable Adaptations to Climate Change

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Modeling of plankton community dynamics characterized by algal toxicity and allelopathy: A focus on historical Prymnesium parvum blooms in a Texas reservoir

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Cyanobacteria and nitrates in karstic systems of Yucatan (Mexico) and Texas (USA)

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Hydrological seasonality and benthic algal biomass in a Neotropical floodplain river

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A new hydrology: effects on ecosystem form and functioning

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Resource fluctuation patterns influence emergent properties of phytoplankton assemblages and their resistance to harmful algal blooms

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A chronicle of a killer alga in the west: ecology, assessment, and management of Prymnesium parvum blooms

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Human interference prevents recovery of infaunal beach communities from hurricane disturbance

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Prymnesium parvum (Carter) - "Golden algae"

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Relative roles of fundamental processes underpinning PEG dynamics in dimictic lakes as revealed by a self-organizing, multi-population plankton model

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Detection of the marine toxins okadaic acid and domoic acid in shellfish and phytoplankton in the Gulf of Mexico.

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Interplay between ambient surface water mixing and manipulated hydraulic flushing: Implications for harmful algal bloom mitigation

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Interannual and Seasonal Patterns of Estuarine Phytoplankton Diversity in Galveston Bay, Texas, USA

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Golden Algae Control: Efficacy of Hydraulic Manipulations in Coves of Lake Granbury

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Use of Discriminant and Fourth-Derivative Analyses With High-resolution Absorption Spectra for Phytoplankton Research: Limitations at Varied Signal-to-Noise Ratio and Spectral Resolution

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Growth at the edge of the niche: An experimental study of the harmful alga Prymnesium parvum

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Losers in the 'Rock-Paper-Scissors' game: The role of non-hierarchical competition and chaos as biodiversity sustaining agents in aquatic systems

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Microalgal productivity, community composition, and pelagic food web dynamics in a subtropical, turbid salt marsh isolated from freshwater inflow

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Effects of nutrient enrichment on Prymnesium parvum population dynamics and toxicity: results from field experiments, Lake Possum Kingdom, USA

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Hydraulic flushing as a Prymnesium parvum bloom-terminating mechanism in a subtropical lake

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Prymnesium parvum: an emerging threat to inland waters.

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Compounding effects of co-occurring disturbances on populations of a harmful bloom-forming mixotrophic protist

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Towards an Understanding of the Interactions between Freshwater Inflows and Phytoplankton Communities in a Subtropical Estuary in the Gulf of Mexico.

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PSEUDONITZSCHIA-AUSTRALIS FRENGUELLI AND RELATED SPECIES FROM THE WEST-COAST OF THE USA - OCCURRENCE AND DOMOIC ACID PRODUCTION

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Potential mechanisms of coexistence between two globally important Pseudo-nitzschia (Bacillariophyta) species

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Laboratory tests of ammonium and barley straw extract as agents to suppress abundance of the harmful alga Prymnesium parvum and its toxicity to fish.

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Population persistence in flowing-water habitats: Conditions where flow-based management of harmful algal blooms works, and where it does not

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COMPARATIVE TOXICITY OF PRYMNESIUM PARVUM IN INLAND WATERS

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Grazers, pathogens and shelf-shading enhance phytoplankton species richness more and reduce productivity less when environments are less dynamic: A theoretical study

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Rotifer-Prymnesium parvum interactions: role of lake bloom history on rotifer adaptation to toxins produced by P-parvum

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Investigating System Characteristics of a Southeast Texas Wetland: Nutrient and Plankton Dynamics of a Tidal Creek in Lower Nueces Delta

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Tropical macrophytes promote phytoplankton community shifts in lake mesocosms: relevance for lake restoration in warm climates

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Interplay between r- and K-strategists leads to phytoplankton underyielding under pulsed resource supply.

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Cyanobacteria in inland waters: new monitoring, reporting, modelling and ecological research

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Beyond hydraulic flushing: Deep water mixing takes the harm out of a haptophyte algal bloom

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Interactions between flow, periphyton, and nutrients in a heavily impacted urban stream: implications for stream restoration effectiveness

# publications[].label
Hypoxia in Waters of the Coastal Zone: Causes, Effects, and Modeling Approaches

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Dynamics of nitrogen-fixing cyanobacteria with heterocysts: a stoichiometric model

# publications[].label
Seasonally variable riverine production in the Venezuelan llanos

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A Spatially Explicit, Multi-nutrient, Multi-species Plankton Model for Shallow Bay Systems

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STIMULATING EFFECT OF ANABAENA SP. (CYANOBACTERIA) EXUDATE ON PRYMNESIUM PARVUM (HAPTOPHYTA)(1).

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Competitive superiority of N-fixing cyanobacteria when fixed N is scarce: Reconsiderations based on a model with heterocyst differentiation

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GENDER-BASED DIFFERENCES IN HABITAT SELECTION AND ACTIVITY LEVEL IN THE NORTHERN PIPEFISH (SYNGNATHUS-FUSCUS)

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Regional shifts in phytoplankton succession and primary productivity in the San Antonio Bay System (USA) in response to diminished freshwater inflows

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A chronicle of a killer alga in the west: ecology, assessment, and management of Prymnesium parvum blooms (vol 764, pg 29, 2016)

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Vertical distribution of herbivorous zooplankton in a well-mixed lake system in which the main predator is a non-selective filter-feeding fish

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Probabilistic ecological hazard assessment of microcystin-LR allelopathy to Prymnesium parvum

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Hydrological seasonality and benthic algal biomass in a Neotropical floodplain river

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Effect of imbalanced nutrients and immigration on Prymnesium parvum community dominance and toxicity: results from in-lake microcosm experiments

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CURRENT STATUS OF MATHEMATICAL MODELS FOR POPULATION DYNAMICS OF PRYMNESIUM PARVUM IN A TEXAS RESERVOIR

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What, How, When, and Where: Spatiotemporal Water Quality Hazards of Cyanotoxins in Subtropical Eutrophic Reservoirs.

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Comparison of two domoic acid-producing diatoms: a review

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Copepod food-quality threshold as a mechanism influencing phytoplankton succession and accumulation of biomass, and secondary productivity: a modeling study with management implications

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Assessment of Spatiotemporal Phytoplankton Composition in Relation to Environmental Conditions of Gorgan Bay, Iran

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Influence of pH on amine toxicology and implications for harmful algal bloom ecology Reply

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Fragilariopsis cylindrus (Grunow) Krieger compared with other species of the diatom Family Bacillariaceae in Antarctic marginal ice edge zones

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Alternative states in the phytoplankton of Lake Kinneret, Israel (Sea of Galilee)

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Origins and scales of hypoxia on the Louisiana shelf: Importance of seasonal plankton dynamics and river nutrients and discharge

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A mechanistic explanation for pH-dependent ambient aquatic toxicity of Prymnesium parvum carter.

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Optically determined sources of allochthonous organic matter and metabolic characterizations in a tropical oligotrophic river and associated lagoon

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The ecophysiology and bloom dynamics of Prymnesium spp.

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Resilience of coastal marine metacommunities to increasing hydraulic connectivity

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Concentration of total microcystins associates with nitrate and nitrite, and may disrupt the nitrogen cycle, in warm-monomictic lakes of the southcentral United States.

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Co-occurring and opposing freshwater inflow effects on phytoplankton biomass, productivity and community composition of Galveston Bay, USA

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Everything is not everywhere: can marine compartments shape phytoplankton assemblages?

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Lumpy species coexistence arises robustly in fluctuating resource environments.

# publications[].publisher
Proceedings of the National Academy of Sciences

# publications[].label
Optically determined sources of allochthonous organic matter and metabolic characterizations in a tropical oligotrophic river and associated lagoon

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Sliding mode dynamics on a preypredator system with intermittent harvesting policy

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Health and ecological impacts of harmful algal blooms: Risk assessment needs

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PRYMNESIUM PARVUM POPULATION DYNAMICS DURING BLOOM DEVELOPMENT: A ROLE ASSESSMENT OF GRAZERS AND VIRUS

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FACTORS INFLUENCING ALGAL BIOMASS IN INTERMITTENTLY CONNECTED, SUBTROPICAL COASTAL PONDS

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Coastal systems in transition: From a 'natural' to an 'anthropogenically-modified' state

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Seasonally varying impact of detritivorous fishes on the benthic ecology of a tropical floodplain river

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COMPARISON OF 2 DOMOIC ACID-PRODUCING DIATOMS - A REVIEW

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Harmful Algal Species Fact Sheet: Prymnesium parvum (Carter) Golden Algae

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Interannual variability in the seasonal plankton succession of a shallow, warm-water lake

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Prymnesium parvum invasion success into coastal bays of the Gulf of Mexico: Galveston Bay case study

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Carbon dioxide exchange in a high marsh on the Texas Gulf Coast: Effects of freshwater availability

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Carbon dioxide exchange in a high marsh on the Texas Gulf Coast: effects of freshwater availability

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The diversity of harmful algal bloom-triggering mechanisms and the complexity of bloom initiation

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Exploitative competition of invaders differentially influences the diversity of neutral, lumpy and intransitive phytoplankton assemblages in spatially heterogeneous environments

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A decade of fish-killing Prymnesium parvum blooms in Texas: roles of inflow and salinity

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Growth and toxicity of Prymnesium parvum (Haptophyta) as a function of salinity, light, and temperature

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Ammonium treatments to suppress toxic blooms of Prymnesium parvum in a subtropical lake of semi-arid climate: results from in situ mesocosm experiments.

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AUTECOLOGY OF THE DIATOM PSEUDONITZSCHIA-AUSTRALIS, A DOMOIC ACID PRODUCER, FROM MONTEREY BAY, CALIFORNIA

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Effects of inflow on harmful algal blooms: some considerations INTRODUCTION

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Chaotic mixotroph dynamics arise with nutrient loading: Implications for mixotrophy as a harmful bloom forming mechanism

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Enrichment and detection of Escherichia coli O157:H7 from water samples using an antibody modified microfluidic chip.

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REMOTE SENSING OF SPATIAL-TEMPORAL VARIATIONS OF CHLOROPHYLL-A IN GALVESTON BAY, TEXAS

# publications[].publisher
Institute of Electrical and Electronics Engineers (IEEE)

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A model of phytoplankton competition for limiting and nonlimiting nutrients: Implications for development of estuarine and nearshore management schemes

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FACTORS INFLUENCING PRYMNESIUM PARVUM POPULATION DYNAMICS DURING BLOOM INITIATION: RESULTS FROM IN-LAKE MESOCOSM EXPERIMENTS

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Prymnesium parvum bloom termination: role of hydraulic dilution

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Water column processes differentially influence richness and diversity of neutral, lumpy and intransitive phytoplankton assemblages

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The role of inflow magnitude and frequency on plankton communities from the Guadalupe Estuary, Texas, USA: Findings from microcosm experiments

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Low pH preempts bloom development of a toxic haptophyte

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Using YY supermales to destabilize invasive fish populations.

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Species extinctions strengthen the relationship between biodiversity and resource use efficiency

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Wolbachia-based mosquito control: Environmental perspectives on population suppression and replacement strategies.

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OCCURRENCE OF THE TOXIC DIATOM NITZSCHIA-PUNGENS F-MULTISERIES IN MASSACHUSETTS BAY, MASSACHUSETTS, USA

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Seasonally varying impact of detritivorous fishes on the benthic ecology of a tropical floodplain river

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Applying principles of resource competition theory to microalgae biomass production: A more refined relationship between species richness and productivity

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Influence of pulsed inflows and nutrient loading on zooplankton and phytoplankton community structure and biomass in microcosm experiments using estuarine assemblages

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Sunlight amelioration of Prymnesium parvum acute toxicity to fish

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Resisting annihilation: relationships between functional trait dissimilarity, assemblage competitive power and allelopathy.

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Mixing of supersaturated assemblages and the precipitous loss of species.

# streetAddress
Department of Marine Biology; Texas A&M University Galveston; P.O. Box 1675

# inTheNews[].label
“Toxic and Deadly: Working to manage algae in Lake Granbury

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Toxic and Deadly: Working to manage algae in Lake Granbury

# inTheNews[].label
Researchers Casting For Answers To Stop Algae Problem In Texas Lakes

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A little competition could rein in algal blooms

# inTheNews[].label
“Battling golden algae Results suggest preventative lake management approaches

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Battling golden algae Results suggest preventative lake management approaches

# inTheNews[].label
Saving coral reefs in Red Sea: Team studies effects of population growth

# inTheNews[].label
Texas A&M Researchers Found A Fix For Out-Of-Control Algal Blooms

# etdChairOf[].label
Umphres, George 1987- (2012-12). Exploring a Chemical Approach for the Mitigation of Prymnesium parvum Blooms and Ecological Considerations. Master's Thesis.

# etdChairOf[].label
Withrow, Frances Grace (2017-05). Going Vertical: The Influence of Irradiance, Mixing, Sinking, and Benthic Flux on Species Supersaturated Phytoplankton Assemblages in a One-Dimensional Water Column Framework. Master's Thesis.

# etdChairOf[].label
Miller, Carrie J. (2007-05). Factors influencing algal biomass in hydrologically dynamic salt ponds in a subtropical salt marsh. Master's Thesis.

# etdChairOf[].label
Gable, George M.,  IV (2007-08). Spatio-temporal patterns of biophysical parameters in a microtidal, bar-built, subtropical estuary of the Gulf of Mexico. Master's Thesis.

# etdChairOf[].label
Bloomer, Tymon Daniel (2017-05). Mitigation of Prymnesium parvum Blooms by Clipper Herbicide. Master's Thesis.

# etdChairOf[].label
Davis, Stephen Louis (2014-05). Beyond the Edge of a Niche: The Role of Grazing on Prymnesium parvum Bloom Formations in Two Texas Lakes. Master's Thesis.

# etdChairOf[].label
Montoya Ceballos, Jose Vicente (2008-12). Influence of hydrological seasonality on sandbank benthos: algal biomass and shrimp abundance in a large neotropical river. Doctoral Dissertation.

# etdChairOf[].label
Neisch, Michael (2014-05). A Study on Biological Threats to Texas Freshwater Resources. Master's Thesis.

# etdChairOf[].label
Buyukates, Yesim (2003-12). Characterization of the plankton community in the lower Rincon Delta: Investigations regarding new approaches to management. Doctoral Dissertation.

# etdChairOf[].label
Errera, Reagan Michelle (2003-05). Inhibition and success of prymnesium parvum invasion on plankton communities in Texas, USA and prymnesium parvum pigment dynamics. Master's Thesis.

# etdChairOf[].label
Hewitt, Natalie Case (2011-05). Modeling plankton dynamics during a Prymnesium parvum bloom: The importance of inflows and allelopathic relationships on bloom dynamics. Master's Thesis.

# etdChairOf[].label
Hayden, Natanya Jeanne (2011-08). Deep Water Mixing Prevents Harmful Algal Bloom Formation: Implications for Managed Fisheries Refugia. Master's Thesis.

# etdChairOf[].label
Hebert, Elizabeth Michele (2003-05). Spring phytoplankton dynamics in a shallow, turbid coastal salt marsh system undergoing extreme salinity variation, South Texas. Master's Thesis.