OCE 1001 Exam 4 Possible Questions In primary production there is a net gain in organic carbon by organisms In general the rate at which energy is stored by organisms through the formation of organic matter is called primary productivity The depth at which the cellular respiration rate equals the photosynthetic rate is referred to as the compensation depth for photosynthesis The color of light most readily absorbed by water is Red Mass mortality events of marine mammals and birds may occur after ingesting prey items that contain algal toxins What organism that can cause harmful algal blooms should humans be concerned about if animals in the area are having seizures and exhibiting erratic drunken like behavior pseudo nitzschia because it causes amnesic shellfish poisoning Diatoms important producers in the epipelagic open ocean are members of the Division Chrysophyta Important marine autotrophs that have silica incorporated into their cell walls are diatoms In dead zones resulting from eutrophication animal life is absent due to the lack of Oxygen Of the following types of organisms which are examples of microscopic algae Coccolithophores Diatoms Dinoflagellates The percentage of biomass regularly decomposed within the euphotic zone is about 90 The relative productivity in the world s oceans from most productive to least productive is temperate waters polar waters tropical waters Productivity in polar oceans is light limited Although primary productivity in tropical areas is generally low which of the following tropical locations have unusually high primary productivity rates All the above tropical areas have relatively high primary productivity In temperate oceans of the northern hemisphere during the summer months nutrient concentrations are low solar input is high and dissolved oxygen decreases Summer productivity in temperate waters typically is hampered by a strong thermocline Of the following statements about oceanic productivity in polar regions which is are true In polar oceans productivity is limited by the lack of sunlight in the winter In polar oceans there is incredibly high productivity in the summertime In polar oceans nutrient concentrations are usually adequate and do NOT limit productivity Of the following statements about oceanic productivity which is are true In middle latitude oceans the fall bloom is limited by the lack of sunlight In middle latitude oceans the spring bloom is limited by the lack of nutrients In tropical oceans productivity is limited year round by the lack of nutrients Which of the following statements correctly explain why biological productivity in the tropical ocean is so meager when compared to biological productivity on land in tropical environments The sunlight penetrates deep into the tropical ocean warming the surface waters and creating stratification of water masses The permanent thermocline presents a barrier that keeps nutrients in deeper water from mixing with surface waters Review the graph which conveys data about biological productivity in polar regions of the Northern Hemisphere Can you label the curves correctly for which relates to phytoplankton and which relates to zooplankton Label other features on the graph Consider what would happen if the euphotic zone became cloudy from sediment rich runoff from a storm near the coast Read the sentences below and fill in the blanks to make them complete and correct In the biogeochemical cycling of matter in marine ecosystems which process re mineralizes nutrients back into the dissolved state bacterial decomposition Energy flow in an ecosystem is unidirectional If 10 000 kilocalories kcal of energy were contained in the primary producers trophic level 1 on average how many kcal of energy would you expect to be transferred to second order consumers trophic level 3 100 kcal Amphipods are deposit feeders Match the term or phrase with its best descriptor Aquaculture farming of commercial fish and shellfish Match the term or phrase with its best descriptor maximum sustainable yield maximum catch without reducing the population of target species The mass of a population of fish present at a given time is called its standing stock Catches above the maximum sustainable yield result in overfishing All the following are challenges to managing fisheries except All the above are correct With the depletion of fish stocks in coastal waters more fishing is being conducted in deeper waters Deep water species are becoming endangered at a rapid rate primarily because most deep water organisms have lower metabolic rates therefore they grow mature and reproduce at a slower rate Of the following types of organisms which one is considered to be LOWEST in a marine food web Select only one answer photosynthetic bacteria Of the following statements about marine fisheries which is are true In U S waters 80 of commercial marine fish stocks are fully exploited or overfished Fishing practices have removed 90 of large marine predatory fish species A recent study indicates that if fishing practices continue marine fish stocks will be depleted by 2048 Match the organism with its correct descriptor of energy use or trophic level Flounder Consumer Match the organism with its correct descriptor of energy use or trophic level Sargassum Producer Match the organism or definition with the correct description of its food preference Anchovy Herbivore Match the organism or definition with the correct description of its food preference Diatom Autotroph Match the organism or definition with the correct description of its food preference an organism that feeds on plants or animals omnivore The function of a swim bladder is to allow a fish to change position in the water column Identify the mismatched pair Squid Annelid Which set of fins is used for turning and braking pectoral and pelvic Which fin s is are most commonly used for moving fast Caudal The caudal fin of fast cruising fish such as tuna is Lunate The fins used by fishes primarily for maneuvering are pectoral and pelvic Of the following groups of organisms which is are considered zooplankton Copepods Radiolarians Krill Jellyfish All except Diatoms Identify the adaptation that allows deep sea fishes to capture prey without exerting much energy sensitive lateral lines Which of the following affect the ability of species to capture food All the above affect the ability of pelagic organisms to capture food The muscle tissue of a lunger is predominantly white Cruisers are
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