In the lake the biomass of plankton decreased from 65000 to 50000 kg. As a result the biomass of the lake minnows (trophic efficiency is 9 %), for which plankton is food, also decreased. How many individuals will the lake pike population decrease by (the average mass is 3.5 kg, trophic efficiency is 12 %)?
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- If 1,000 Joules of energy are present in the primary consumer trophic level of a community, approximately how many Joules might be expected to be present in the primary producer trophic level? Group of answer choices Which of these answers is most likely depends on the particular community 10,000 Joules 100 Joules 1000 JoulesAs a general rule, for each jump up in trophic level, about how much does the available energy drop? Group of answer choices practically 100 percent 90 percent 10 percent 30 percent 50 percentEnergy transferred from one trophic level to the next in an ecosystem is measured in calories, numbers, and in biomass. If a rangeland has a biomass of 100, 000g/m2 from the grass, how much biomass will be available in human beings who eat the cow that eat that grass?
- An estimated 1000 kg of plant plankton are needed to produce 100 kg of animal plankton. The animal plankton is in turned consumed by 10 kg of fish, the amount needed by a person to gain 1 kg of body mass. i) explain why the amount of biomass declines at each successive trophic level.Question: Which of the following has NOT occurred as commercial fishing has expanded? A Fishers (men and women) are fishing further from coastal areas B. Fishers are targetting fish that occur in deeper waters C.Fishers are fishing on a greater number of different species D.Fishers are preferentially targetting large individuals E.The average trophic level of the species captured has increasedTwo species of aquatic snails live in a nearby creek. Species A is a very strong competitor of Species B, who is a weak competitor. What do you expect will happen to the realized niche of Species B if both species share the same fundamental niche?a. increaseb. decreasec. stay the same
- Choose a biological resource and address the following four questions using examples with that biological resource. a) Biomass production over time b) Carrying capacity and extinction threshold c) Management of the recruitment rate d) Describe two ways that climate change could impact the biological resource you selected for this question RESOURCE ECONOMICSIn an ocean ecosystem, the biomass of an algal community is approximately 3000 kilograms. It can support a food chain up to 4 levels. Considering an efficiency at an average of 10% in passing on energy from one trophic level to the next level, how much biomass of the fourth trophic level can be maintained.Trophic levels Part A) In food chains and webs, what trophic level must you have more of than others. Part B) Each trophic level has how much LESS energy? Part C) Can an organism fill more than one trophic level? Explain your answer.
- Asian carp are an invasive species of fish. When the Asian carp invade a river or lake, they overtake the food and space from the native fish. What type of density-dependent factor would this be considered?Lotka-Volterra Competition A small lake is capable of supporting both bluegill and smallmouth bass. These two bony fish species compete for similar food resources. The carrying capacity of this lake for bluegill (K) is 1,500 and for bass (K,) is 500. After some careful measurement, we find that a is 0.5 and that pis 0.25. We stock the lake with 250 bluegill and 750 bass. Over time, will both species be able to co-exist? If not, which one will be driven to extinction in this lake? If so, approximately how many of each species will be present? Please show the equation step by step on paper pleaseA) What is the independent variable? What is the dependent variable? B)In what type of environment would you most likely find Fish Species 1 In what type of environment would you most likely find Fish Species 2 C)How much oxygen is consumed by Fish Species 1 when the salinity is 10 ppt? Fish Species 2 will consume 6 mg/min of oxygen at what salinity