Learn More
This review discusses the interface between two of the most important types of interactions between species, interspecific competition and predation. Predation has been claimed to increase, decrease, or have little effect on, the strength, impact or importance of interspecific competition. There is confusion about both the meaning of these terms and the(More)
Species-area relationships have been observed for virtually all major groups of macroorganisms that have been studied to date but have not been explored for microscopic phytoplankton algae, which are the dominant producers in many freshwater and marine ecosystems. Our analyses of data from 142 different natural ponds, lakes, and oceans and 239 experimental(More)
In a set of laboratory experiments, we examined competition for phosphorus between algae and bacteria under various carbon:phosphorus (C:P) supply ratios in spatially homogeneous and heterogeneous microcosms. Experimental results were compared to those predicted by theoretical models of resource competition. In the spatially heterogeneous microcosm, algae(More)
Ecological stoichiometry is emerging as a central organizing framework upon which our perceptions of aquatic trophic dynamics are being reshaped. The microbial component of aquatic systems is crucial to overall nutrient dynamics, yet little data are available addressing the ecological stoichiometry of microorganisms. Pseudomonas fluorescens, a commonly(More)
This paper examines a model of a flowing water habitat with a hydraulic storage zone in which no flow occurs. In this habitat, one or two microbial populations grow while consuming a single nutrient resource. Conditions for persistence of one population and coexistence of two competing populations are derived from eigenvalue problems, the theory of(More)
Within the human body, pathogenic bacteria can invade the bloodstream or adapt to an intracellular or communal environment, such as a biofilm. To counteract bacterial invasion, the body's defense system elicits an immune response, and phagocytic cells are sent to destroy the pathogens by eating them. Although this process is one of the most important(More)
Since the mid-1980s, fish-killing blooms of Prymnesium parvum spread throughout the USA. In the south central USA, P. parvum blooms have commonly spanned hundreds of kilometers. There is much evidence that physiological stress brought on by inorganic nutrient limitation enhances toxicity. Other factors influence toxin production as well, such as stress(More)
Approved for public release; distribution is unlimited. Abstract Prymnesium parvum, a haptophyte alga, occurs worldwide. It is tolerant of large variations in temperature and salinity, and is capable of forming large fish-killing blooms. In the United States, the first recorded P. parvum bloom occurred in 1985 in a semi-arid region of the country (Pecos(More)