An ecologist studying the availability of nutrients and the distribution of the plants that live in this habitat is working at this level. An ecologist studying the size and distribution of the Karner blue butterfly is working at this level. An ecologist studying the mutualistic relationship between the Karner blue butterfly and ants is working at this level. An ecologist studying behavior of the caterpillars when they are at different larval stages is working at this level [Choose ] [Choose ] Community Organismal Ecosystem Population ChooseT [Choose ] [Choose ]

An ecologist studying the availability of nutrients and the distribution of the plants that live in this habitat is working at this level. An ecologist studying the size and distribution of the Karner blue butterfly is working at this level. An ecologist studying the mutualistic relationship between the Karner blue butterfly and ants is working at this level. An ecologist studying behavior of the caterpillars when they are at different larval stages is working at this level [Choose ] [Choose ] Community Organismal Ecosystem Population ChooseT [Choose ] [Choose ]

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter16: Population Ecology

Section: Chapter Questions

Problem 11SQ

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DRAW IT In the Chesapeake Bay estuary, the blue crab is anomnivore that eats eelgrass and other primary producers as wellas clams. It is also a cannibal. In turn, the crabs are eaten byhumans and by the endangered Kemp’s Ridley sea turtle. Basedon this information, draw a food web that includes the bluecrab. Assuming that the top-down model holds for this system,describe what would happen to the abundance of eelgrass ifhumans stopped eating blue crabs.
A feeding relationship that proceeds from algae to a fish, then to a fisherman, and then to a shark is _____. a. a food chain b. a food web c. a and b
APredator and its prey interact __________, but if the predator affects anotherspecies through this interaction, ecologists describe it as a(n) ___________interaction.a. strongly; inefficientb.directly; variablec.weakly; diffused.indirectly; keystonee.directly; indirect
Explain the effects on the ecosystem if Wood rat were removed. Provide both positive (if any) and negative impacts on the ecosystem. Be sure and include as many of the following terms in your writing as possible: autotroph, heterotroph, producer, primary consumer, secondary consumer, tertiary consumer, carnivore, omnivore, herbivore, energy, population, increase, and decrease.
Old People e = 100 calories λ = 10 per night h = 2 hours Middle Aged People e = 400 calories λ = 20 per night h = 5 hours Young Adults e = 300 calories λ = 10 per night h = 2.5 hours Suppose that the organism need 1000 calories per night. - Which food item should the organism prefer, and which ones would you expect them to eat on a regular basis? Explain why and show calculations. - Explain marginal value theorem, and how it might relate to an organisms foraging decisions. - λ for Old People should increase in the coming years. How could that affect this organisms feeding on humans?
Consider a trophiccascade with 4 levels: 1) predatory fish that consume planktivorous fish, 2) planktivorous fish that consume zooplankton,3) herbivorous zoplankton that consume phytoplankton, and 4) phytoplankton. True or False: A reduction in predatory fish will increase the level of phytoplankton. True False
manatees are shallow water herbivores that face increasing threats. Use your know knowledge of seawater properties to describes some of the reasons why manatee populations are in decline. How can we reverse this decline? Please be sure to reference your article (include information about it) in your answer and define any scientific terms your audience may not know.
The greatest biomass of primary mammalian consumers in Biome A comprises grazers. True False
For each statement, select TRUE (1) if it is consistent with the food web presented above, or FALSE (2) if it is not consistent with the food web. If poaching by humans removed many elephants, then the number of wild dogs and lions would decrease. Reducing the number of species in this food web would likely increase the amount of time it takes this food web to recover from perturbation. A drastic reduction in the number of snakes due to wildfires would strongly affect mice in this ecosystem. Assume mice are not directly affected by wildfires. If a pesticide was applied to gourds and started to bioaccumulate in them, biomagnification would result in high concentrations of the pesticide in wild dogs. If a flood removed 50% of ants, then the biomass of pheasants would also decrease by 50%. Assume pheasants are not directly affected by flooding. Ants and mice may be competing for tulips.
Which of the following represents a grazing food chain?a. leaves → detritus feeders → deer → owlsb. birds → mice → snakesc. nuts → leaf-eating insects → chipmunks → hawksd. leaves → leaf-eating insects → mice → snakes
A ghost shrimp is the dominant estuarine macroinvertebrate in the sediment along Amero-trailing coast. Describe the likely processes or activities of the ghost shrimp and how they help to maintain the health of the ecosystem.
EcosystemA hasprimary production of 1000 g C /m2/yr and ecological efficiency of 10%. Ecosystem B has primary production of 300 g C /m2/yr and an ecological efficiency of 25%. a.Which ecosystem will have more production at thesecondary consumer (carnivore) trophic level? b.Which ecosystem is more likely to support an endothermic primary consumer (herbivore)? c.If atrophic level requires at least 1 gC/m2/yr in order to exist, how many trophic levels can each of these ecosystems support?d.Given your answer to part c, which do you thinkhas a larger impact on the energy available at upper trophic levels: primary productivity or efficiency of energy movement across trophic levels?