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An algal bloom or algae bloom is a rapid increase or accumulation in the population of algae in freshwater or marine water systems. It is often recognized by the discoloration in the water from the algae's pigments. The term algae encompasses many types of aquatic photosynthetic organisms, both macroscopic multicellular organisms like seaweed and microscopic unicellular organisms like cyanobacteria. Algal bloom commonly refers to the rapid growth of microscopic unicellular algae, not macroscopic algae. An example of a macroscopic algal bloom is a kelp forest.
Zooplankton are the animal component of the planktonic community. Plankton are aquatic organisms that are unable to swim effectively against currents, and consequently drift or are carried along by currents in the ocean, or by currents in seas, lakes or rivers.
Upwelling is an oceanographic phenomenon that involves wind-driven motion of dense, cooler, and usually nutrient-rich water from deep water towards the ocean surface. It replaces the warmer and usually nutrient-depleted surface water. The nutrient-rich upwelled water stimulates the growth and reproduction of primary producers such as phytoplankton. The biomass of phytoplankton and the presence of cool water in those regions allow upwelling zones to be identified by cool sea surface temperatures (SST) and high concentrations of chlorophyll-a.
Emiliania huxleyi is a species of coccolithophore found in almost all ocean ecosystems from the equator to sub-polar regions, and from nutrient rich upwelling zones to nutrient poor oligotrophic waters. It is one of thousands of different photosynthetic plankton that freely drift in the euphotic zone of the ocean, forming the basis of virtually all marine food webs. It is studied for the extensive blooms it forms in nutrient-depleted waters after the reformation of the summer thermocline. Like other coccolithophores, E. huxleyi is a single-celled phytoplankton covered with uniquely ornamented calcite disks called coccoliths. Individual coccoliths are abundant in marine sediments although complete coccospheres are more unusual. In the case of E. huxleyi, not only the shell, but also the soft part of the organism may be recorded in sediments. It produces a group of chemical compounds that are very resistant to decomposition. These chemical compounds, known as alkenones, can be found in marine sediments long after other soft parts of the organisms have decomposed. Alkenones are most commonly used by earth scientists as a means to estimate past sea surface temperatures.
High-nutrient, low-chlorophyll (HNLC) regions are regions of the ocean where the abundance of phytoplankton is low and fairly constant despite the availability of macronutrients. Phytoplankton rely on a suite of nutrients for cellular function. Macronutrients are generally available in higher quantities in surface ocean waters, and are the typical components of common garden fertilizers. Micronutrients are generally available in lower quantities and include trace metals. Macronutrients are typically available in millimolar concentrations, while micronutrients are generally available in micro- to nanomolar concentrations. In general, nitrogen tends to be a limiting ocean nutrient, but in HNLC regions it is never significantly depleted. Instead, these regions tend to be limited by low concentrations of metabolizable iron. Iron is a critical phytoplankton micronutrient necessary for enzyme catalysis and electron transport.
Photosynthetic picoplankton or picophytoplankton is the fraction of the phytoplankton performing photosynthesis composed of cells between 0.2 and 2 µm in size (picoplankton). It is especially important in the central oligotrophic regions of the world oceans that have very low concentration of nutrients.
Pyrocystis fusiformis is a non-motile, tropical, epipelagic, marine dinoflagellate, reaching lengths of up to 1 mm. P. fusiformis display bioluminescence when disturbed or agitated. In coastal marine waters, this dinoflagellate causes glowing effects after dark. P. fusiformis was first described in the Proceedings of the Royal Society of London in 1876.
In physical oceanography, Langmuir circulation consists of a series of shallow, slow, counter-rotating vortices at the ocean's surface aligned with the wind. These circulations are developed when wind blows steadily over the sea surface. Irving Langmuir discovered this phenomenon after observing windrows of seaweed in the Sargasso Sea in 1927. Langmuir circulations circulate within the mixed layer; however, it is not yet so clear how strongly they can cause mixing at the base of the mixed layer.
Picoeukaryotes are picoplanktonic eukaryotic organisms 3.0 µm or less in size. They are distributed throughout the world's marine and freshwater ecosystems and constitute a significant contribution to autotrophic communities. Though the SI prefix pico- might imply an organism smaller than atomic size, the term was likely used to avoid confusion with existing size classifications of plankton.
Bruce A. Menge is an American ocean ecologist. He has spent over forty years studying the processes that drive the dynamics of natural communities. His fields of interest include: structure and dynamics of marine meta-ecosystems, responses of coastal ecosystems to climate change, linking benthic and inner shelf pelagic communities, the relationship between scale and ecosystem dynamics, bottom-up and top-down control of community structure, recruitment dynamics, ecophysiology and sub-organismal mechanisms in environmental stress models, larval transport and connectivity, impact of ocean acidification on marine ecosystems, controls of productivity, population, community, and geographical ecology. He settled on two career goals: carrying out experiment-based field research to investigate the dynamics of rocky intertidal communities, focusing on species interactions and environmental context and how this might shape a community, and using the resulting data to test and modify theories on how communities were organized.
A planktivore is an aquatic organism that feeds on planktonic food, including zooplankton and phytoplankton. Planktivorous organisms encompass a range of some of the planet's smallest to largest multicellular animals in both the present day and in the past billion years; basking sharks and copepods are just two examples of giant and microscopic organisms that feed upon plankton. Planktivory can be an important mechanism of top-down control that contributes to trophic cascades in aquatic and marine systems. There is a tremendous diversity of feeding strategies and behaviors that planktivores utilize to capture prey. Some planktivores utilize tides and currents to migrate between estuaries and coastal waters; other aquatic planktivores reside in lakes or reservoirs where diverse assemblages of plankton are present, or migrate vertically in the water column searching for prey. Planktivore populations can impact the abundance and community composition of planktonic species through their predation pressure, and planktivore migrations facilitate nutrient transport between benthic and pelagic habitats.
Susana Agustí Requena is a Spanish biological oceanographer who has participated in over 25 oceanographic expeditions in the Arctic, Southern Ocean (Antarctic), Atlantic, Pacific and Indian Oceans. She played a key role in the Malaspina Circumnavigation Expedition. She is professor in Marine Science at King Abdullah University of Science and Technology in Saudi Arabia and an adjunct Professor at the University of Tromsø (Norway).
The viral shunt is a mechanism that prevents marine microbial particulate organic matter (POM) from migrating up trophic levels by recycling them into dissolved organic matter (DOM), which can be readily taken up by microorganisms. The DOM recycled by the viral shunt pathway is comparable to the amount generated by the other main sources of marine DOM.
William Li is a Canadian biological oceanographer who did research on marine picoplankton, marine macroecology, ocean surveys of plankton from measurements of flow cytometry, and detection of multi-annual ecological change in marine phytoplankton.
Trevor Charles Platt was a British and Canadian biological oceanographer who was distinguished for his fundamental contributions to quantifying primary production by phytoplankton at various scales of space and time in the ocean.
Mary Jane Perry is an American oceanographer known for the use of optics to study marine phytoplankton.
Sonya Dyhrman is an earth and environmental sciences professor who studies the physiology of phytoplankton and their role within marine ecosystems. She is also a fellow of the American Academy of Microbiology.
Patricia Marguerite Glibert is marine scientist known for her research on nutrient use by phytoplankton and harmful algal blooms in Chesapeake Bay. She is an elected fellow of the American Association for the Advancement of Science.
Margaret Ruth Mulholland is professor at Old Dominion University known for her work on nutrients in marine and estuarine environments.
Susanne Menden-Deuer is an oceanographer and marine scientist known for her work on marine food webs, including their structure and function. As of 2022 she is president-elect of the Association for the Sciences of Limnology and Oceanography.
References
- 1 2 "Patricia Wheeler". Oregon State University. 8 April 2020. Retrieved 16 Dec 2020.
- ↑ Ancestry.com. California Birth Index, 1905-1995 [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2005.
- 1 2 "Wheeler-Westall". The Asheville Citizen. 22 June 1988. p. 17. Retrieved 16 Dec 2020.
- ↑ "OSU Professor Named National Journal Editor". Oregon State University. 13 Oct 2009. Retrieved 16 Dec 2020.
