If biologists determine that this country’s sustained yield of fish is 17 million metric tons per year. What is the country’s sustainable biological capacity?
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If biologists determine that this country’s sustained yield of fish is 17 million metric tons per year. What is the country’s sustainable biological capacity?
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- What percentage of the worldwide fisheries stocks are now depleted or overfished?What if we were able to restore some critical salmon habitat, like the forests surrounding the spawning streams? To test this restoration, increase K to 40,000 fish. What would that do to the MSY value? [ Select ] Does this mean you would be able to harvest more or less fish? [ Select ]What is the likely carrying capacity of the fish population using the data given above?
- Which limiting factor would affect the carrying capacity for all species in the pictured ecosystem? a) Number of trees for giraffes b) Hunting behavior of lions c) Birth rate of the giraffes d) Amount of grasslandWhy do managers try to maintain populations of fish and game species at about half their carrying capacity?At what general size does a fish population have the greatest potential for growth and reproduction?
- When populations of ocean perch and herring are reduced, which other species in this ecosystem are directly affected? Identify at least two species that directly lose their food source.List and discuss three policies that could be used to encourage sustainable fishery management.a) how would an increase in the number of producers affect the number and size of trophic levels in an ecosystem? b) how would an increase in the availability of a resource that was limiting the herbivore population size affect the number and size of trophic levels in an ecosystem?
- Why is the Atlantic cod listed as "Vulnerable" on the IUCN Red List of Threatened Species, but only as a " Species of Concern" in the NOAA Fisheries Directory? Fully cite all resources used7)Which of the following is the best definition of a trophic cascade? a)Significantly changing the population size of one species causes significant changes in the population dynamics of other species b)Adding or removing one species causes significant changes the population dynamics of other species in the community c)Significantly changing the population size of a species at one trophic level causes significant changes in the population dynamics of populations that do not directly interact with this species d)Adding or removing species causes a collapse of the food web for that community e)None of these definitions are accurateAre higher macroinvertebrate indicators of less or more stream health? Do different invertebrate species have different tolerances to pollutants, thus can be used as an indicator of stream health? does Aquatic vegetation has a greater influence on zooplankton or benthic macroinvertebraes