But a few hundred feet down below, the water is icy cold. public housing priority for families with more than two children. E)The direct sunlight received by the creosote bush in the desert area during a 12 month period. The zone in which species are adapted to the lowest light and the highest pressure? limited educational opportunities for women. phytoplankton are most abundant in the upper few hundred feet of most bodies of water because: sunlight does not penetrate to great depths in water. Describe one commercial activity other than whaling, that may result in the death of right whales. Most of the phytoplankton in inland waters obtain all of their energy from light and their chemical requirements from dissolved inorganic solutes, i.e., they are photolithotrophs. Phytoplankton are most abundant in the upper few hundred feet of most bodies of water because. Chrysophyceae and Cyanophyceae occurred in appreciable amounts only at upper layers waters in the NSCS. The units (cells, colonies, and filaments) were enumerated to at least 100 specimens of the most abundant species (Lund et al. ... the most abundant algae in most samples, were more numerous southward. Since phytoplankton require the sun's energy to turn carbon dioxide and water into food and energy via photosynthesis, they inhabit the sunlit upper layers of freshwater and marine environments. All of the following statements about invasive exotic species are true EXCEPT: D)They tend to have low reproductive rates. The holoplanktonic species spend their entire lives in the pelagic environment; meroplanktonic forms are temporary members of the plankton, and include the eggs and larval stages of many benthic invertebrates and fish. III. It is also known by the name of microalgae, is similar to terrestrial plants which contain chlorophyll and require sunlight to live and grow properly. open oceans produce the largest share of earths biomass because the NPP of the oceans is low, but the: large expanse of the oceans supports enormous numbers of producers such as phytoplankton. To ensure the best experience, please update your browser. The Benguela Current / b ɛ ŋ ˈ É¡ ɛ l ə / is the broad, northward flowing ocean current that forms the eastern portion of the South Atlantic Ocean gyre.The current extends from roughly Cape Point in the south, to the position of the Angola-Benguela front in the north, at around 16°S. 10) Which is produced during photosynthesis? A student has hypothesized that the shade cast by the solar panels will increase the mortality of creosote bush, a native desert plant in the area. They are usually responsible for the color and clarity of lakes, wetlands, rivers, streams and estuaries. Most are buoyant and float in the upper portion of the ocean where sunlight can reach them. species into coda. In the upper 100 m of the water column, their relative contribution remained approximately 1% until the onset of stratification, and persisted at 0.5–1% between 80 and 120 m throughout the summer. 1958). The microscopic phytoplankton are suspended in the seawater. The current is driven by the prevailing south easterly trade winds. Associated phytoplankton, with a share of 3% UPA (Utermöhl phytoplankton assemblage cell abundance), primarily consisted of Dinophyceae. which of the following describes the changes in a countrys demographics as it begins its transition from a pre industrial state to an industrial state: population increases rapidly, birth rate remains high, death rate decreases. Which environment is characterized by the highest diversity of tree species? C)The types of food found on the two islands exert selective pressure on the beak size. Which of the following diagrams correctly illustrates in nitrogen cycle? I. Ringed seals, the preferred prey of polar bears, come to holes in the summer to breathe. D)Decomposition of organic matter on the deep ocean floor. 5) The terrestrial biomes shown in the diagram vary in net primary productivity. The fisheries of the North Pacific Ocean and the Bering Sea are among the most productive in the world, in part because of the large concentration of phytoplankton there. Even the smallest twilight zone inhabitants can be powerful through sheer number, however. As the amount of sea has decreased, larger expanses of the Arctic Ocean are now completely free of sea ice for several weeks each summer. The biggest impact was seen a few hundred feet deep in the water column, at the point where phytoplankton have enough light from above to still grow, and are receiving the most … Phytoplankton is the basis of different food webs that survive in water. another likely cause for this decline is: increasing numbers of women entering the workforce in developing nations. In Antarctica, Adélie penguins depend on polynyas, where phytoplankton are abundant, throughout much of their lives. Identify a primary producer in this food web. II. 17) Which of the following is the most likely reason that the greatest number of extinctions of bird species occurred in the period 1901- 2000? 23) At which time after clearcutting does the ecosystem exhibit the greatest species richness? which of the following statements is best supported by the population doubling times indicated on the map? Increased education of ship captains and crews about whale habitat/migration routes/feeding behaviors in order to reduce ship collisions with whales. The word "trophy" refers tothe rate of … Phytoplankton are free-floating, microscopic algae. which of the following measures would be most likely to promote fertility above replacement level? Learn more about phytoplankton in this article. answer choices ... low, but the large expanse of the oceans supports enormous numbers of producers such as phytoplankton. the best explanation for the lower humidity is that: warm air rises at the equator, cools, and sinks at 30 degrees latitude. Of the following ecosystems, which has the lowest net primary productivity, measured as kilocalories of energy produced per square meter per year? -Limited food/water supply leads to migration to locations with more food/water supply. The target species for this study, Pentapharsodinium dalei, is a small thecate dinoflagellate common in shallow marine environments north of the North Atlantic Current . low, but the individual producers found there are huge in size. which of the following annual population growth rates is paired with the correct doubling time. The marine zooplankton community includes many different species of animals, ranging in size from microscopic protozoans to animals of several metres in dimension. 16) Which of the following is an example of a carbon sink? Phytoplankton responses. One hundred and twenty-three individual clones of phytoplankton representing twelve algal classes were examined in exponential growth for intra- and extracellular DMS (and its precursor DMSP). Which biome provides ecosystem services that include reducing the severity of floods and filtering pollutants from the water? Phytoplankton culturing. 6) Correct statements about the northern spotted owl include which of the following? Iii Identify a secondary consumer. Phytoplankton are, by definition, photosynthetic, and include cyanobacteria as well as algae. Which environment is most likely to be characterized by dry scrub with frequent fires? During the summer, the sun warms the surface layer of the ocean. the explanation for the variation includes which of the following? Which of the following best explains why decomposers in soils and water are important to ecosystems? This next level includes small crustaceans that eat phytoplankton and microzooplankton. The North Atlantic right whale migrates between subtropical and polar water annually. (i)The primary producer in this food web is phytoplankton. These, especially copepods, which range in size from nearly microscopic to about a half-inch, and the shrimp-like krill, are he most abundant multi-celled animals in the sea and are critical food supplies for fish and baleen whales. Marine life, or sea life or ocean life, is the plants, animals and other organisms that live in the salt water of the sea or ocean, or the brackish water of coastal estuaries.At a fundamental level, marine life affects the nature of the planet. The primary producer in this food web is phytoplankton. Decreasing area of hunting ground (area of ice used for hauling out/fewer seal breathing holes/seals are a less available food source because of more open water) makes it more difficult for polar bears to get food • Increasing area/distance between hunting ground means the polar bears have to exert more energy to swim to find food/physical exhaustion from swimming results in less energy available for hunting. We must drill a hole through the ice to obtain water samples at various depths below the ice. One hundred and nine phytoplankton taxa were collected during this study, the majority of which were Chlorophyta (49 taxa), Desmidiaceae (23), Cyanophyta (14), Diatomeae (10), Euglenophyceae (7), Chrysophyceae (3), Dinoflagellata (2) and Cryptophyceae (1). They are benthic organisms b. The algal classification follows the taxonomy and trivial names of AlgaeBase (Guiry and Guiry, 2014).Class, order, and species of the cultured strains are presented in Table Table3. Like land vegetation, phytoplankton uses carbon dioxide, releases oxygen, and converts minerals to a form animals can use. The species of Cyanophyta and Chlorophyta that wrere most abundant in the surface samples also dominated the phytoplankton at 1 m. Four of the five major pulses (two in later summer and three in winter) that took place during the year at the surface also … d. Sunlight does not penetrate to … 1. Which statement about tundras and boreal forests is correct? Given that beak size is generally determined, which of the following hypotheses is the most likely explanation for the difference in data between the islands? The carbon in the phytoplankton is soon covered by other material sinking to the ocean bottom. The ice drill cuts a 4-inch diameter hole through as much as 14 feet of ice. most deserts are at 30 degrees north and 30 degrees south because humidity is lower at 30 degrees. phytoplankton are most abundant in the upper few hundred feet of most bodies of water because: sunlight does not penetrate to great depths in water most deserts are at 30 degrees north and 30 degrees south because humidity is lower at 30 degrees. 18) Which species grows best with full sunlight? Among the common kinds are cyanobacteria, silica-encased diatoms, dinoflagellates, green algae, and chalk-coated coccolithophores. B (high/constant temp and low precipitation w/ peak in winter). Most of them belong to nanophytoplankton (Equivalent Sphere Diameter is 10–15 μm). Some phytoplankton are bacteria, some are protists, and most are single-celled plants. Common types of phytoplankton in the Great Lakes include: Diatoms; Green algae AND • Increasing absorption of the sun's energy warms the water surface further, which leads to further ice melt (completes positive feedback loop). It looks like your browser needs an update. Several otherpigments, such as chlorophyll b, c, d and e, carotenoids, xanthophyllsand biliproteins, can be found in plants. 3.The cultured phytoplankton genera were chosen based on the most abundant taxa in the phytoplankton database of the Finnish Environment Institute (SYKE). Derived from the Greek words phyto (plant) and plankton (made to wander or drift), phytoplankton are microscopic organisms that live in watery environments, both salty and fresh.. Phytoplankton, a flora of freely floating, often minute organisms that drift with water currents. people in north america consume more meat per capita than people in other regions of the world. This paper defines the most abundant centric diatoms and coexisting species in the phytoplankton of karst lakes in Croatia as contri-bution to better description of phytoplankton func-tional groups dominated by centric diatoms. Oh no! D)Boreal forests have larger dominant plant growth forms than tundras, Phytoplankton are most abundant in the upper few hundred feet of most bodies of water because, C)Sunlight does not penetrate to great depths in the water. Nearly 50 percent of right whale deaths are anthropogenic in nature. deposition of organic matter on the deep ocean floor. What are phytoplankton? (ii) Krill is the primary consumer in this food web (iii) The secondary consumers are Arctic Cod and Ringed Seal. Ii Identify the primary consumer. Phytoplankton are most abundant in the upper few hundred feet of most bodies of water because: a. Phytoplankton is important also in the global carbon cycle, and therefore the global climate, because the phytoplankton, or organisms higher in the food chain, sink to the ocean floor when they die. https://quizlet.com/176105536/apes-chpt-6-7-and-ing-8-flash-cards The photic zone, euphotic zone, epipelagic zone, or sunlit zone is the uppermost layer of a body of water that receives sunlight, allowing phytoplankton to perform photosynthesis.It undergoes a series of physical, chemical, and biological processes that supply nutrients into the upper water column.The photic zone is home to the majority of aquatic life due to its location. Hence, phytoplankton species dwelling in the surface waters of the fjord have, over the past century, experienced extremes of salinity ranging roughly from 15 to 30. In this way, the oceans act as a sink of global carbon. -Shows the flow of energy among trophic levels. The highest concentrations generally are near the surface where the sunshine is most abundant. Phytoplankton are most abundant in the upper few hundred feet of most bodies of water because. which of the following is an example of a carbon sink? of stratification of the upper 100 m. The relative ability of flagellates and diatoms to react to varying growth conditions, in turn dependent on hydrography, is discussed. Explain how melting sea ice leads to a feedback loop that increases Arctic warming. Melting of sea ice leads to a decrease in albedo, or reflectivity leads to water surfaces absorbing more of the sun's energy. Describe one strategy that could reasonably be implemented to decrease right whale deaths caused by the commercial activity you described in part ii. The table below shows measurements of the beak size of a sample of ten ground finches on each of 2 islands in the Galapagos archipelago. They feed on zooplankton, which are found only in the top layers of water. Why are phytoplankton most abundant in the upper few hundred feet of most bodies of water that is the depth to which sunlight can penetrate Earth's deserts are mostly 30 degrees north and 30 degrees south latitudes where humaidity is lower. Primary production representsthe synthesis of organic matter of aquatic systems and the totalprocess, photosynthesis, whose complex metabolic pathway can beoversimplified as follows: light + 6CO2 + 6H2O ----> C6H12O6 + 6O2 Plants have photosynthetic pigments, one of which, cholorophyllais present in almost all photosynthetic organisms. The explanation for the variation includes which of the following? The zone in which then the greatest total mass of carbon dioxide is absorbed from the atmosphere. Phytoplankton abundance was estimated using an Olympus CK40 inverted microscope, by the settling technique (Utermöhl 1958). Describe how the change in sea ice habitat is affecting polar bears' ability to hunt and feed. Phytoplankton are free-floating, microscopic algae that inhabit the sunlit, upper layer of most freshwater and marine environments. Construction of a solar power plant is proposed for a desert area near a school. Approximately how many more mammal species became extinct in the period 1901-2000 than became extinct in the period 1801-1900? Most of it is tiny, just a few inches long or less. 19. Down in the ocean depths, lots of nutrients are available for the phytoplankton, but without sunlight, they can't grow. For the phytoplankton to use the nutrients, the nutrients must be transported to the surface. Raven, S.C. Maberly, in Encyclopedia of Inland Waters, 2009. . surface oceanic circulation results most directly in the distribution of: heat from tropical to temperate and polar regions. Phytoplankton obtain energy through the process of photosynthesis and must therefore live in the well-lit surface layer (termed the euphotic zone) of an ocean, sea, lake, or other body of water.Phytoplankton account for about half of all photosynthetic activity on Earth. Ships and whales use the same channels, which can increase the number of ship strikes. the world population growth rate in 2015 is about 1%. Other than showing which organisms are consumed by other organisms, describe what is indicated by the direction of the arrows in the diagram. india has a higher population growth rate than china and australia have. J.A. 20) Which one of the following is fixed from the atmosphere by the bacteria? The two islands are about ten kilometers apart, and all the birds are the same species. This is important for a few reasons. which latitude shown on the diagram above experiences 24 hours of daylight on december 21. which of the following statements is consistent with the graphs above? Before construction begins, what experimental data should the student collect in order to eventually test the hypothesis? low, but still higher than that of other ecosystems of the world. C)Increased environmental disturbances from human activities altered bird habitats. Many species, including some whales and birds, will travel thousands of kilometers during annual migrations. But some, like gelatinous siphonophores, can form chains that extend as much as 130 feet, making them among the biggest animals that exist today. the best explanation for the lower humidity is that: In a balanced ecosystem, they provide food for a wide variety of marine creatures, including whales, shrimp, snails and jellyfish. c. They can most readily hide from predators there. 21) The zone that has the highest biodiversity, Open oceans produce the largest share of Earth's biomass because of the net primary productivity (NPP) of the oceans is, Low, but the large expanse of the oceans support enormous numbers of producers such as phytoplankton. the terrestrial biomes shown in the diagram above very in NPP. it is expected to drop to 0.5% by 2050. partly because of increases access to birth control in dveloping nations.