QUESTION 1 Why are food chains relativel short? O energy transfers are not perfectly efficient O each trophic position comes with increasing competition for limited resources organisms involve in interguild predation at higher trophic positions. limiting the length of connections. O too little photosynthetically active radiation is converted into primary production to sustain longer connections. QUESTION 2 species have a Okeystone, large O keystone, small O dominant, large O dominant, small impact on community structure despite comprising a relatively small portion of the biomass of the community. QUESTION 3 What happened to the number of species in the inter-tidal community when sea stars (a top predator) were removed? it increased Oit decreased O it remained the same results are pending

QUESTION 1 Why are food chains relativel short? O energy transfers are not perfectly efficient O each trophic position comes with increasing competition for limited resources organisms involve in interguild predation at higher trophic positions. limiting the length of connections. O too little photosynthetically active radiation is converted into primary production to sustain longer connections. QUESTION 2 species have a Okeystone, large O keystone, small O dominant, large O dominant, small impact on community structure despite comprising a relatively small portion of the biomass of the community. QUESTION 3 What happened to the number of species in the inter-tidal community when sea stars (a top predator) were removed? it increased Oit decreased O it remained the same results are pending

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter54: Ecosystems And Global Change

Section: Chapter Questions

Problem 10TYK: Which of the following statements is supported by the results of studies at the Hubbard Brook...

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The Law of 10% in trophic levels states O Only 10% of the energy in a trophic level is transferred to the next tropic level by consumption O Only 10% of the prey are eaten by a top predator O 10% of the energy is lost between one trophic level to the next O 10% of the energy in an ecosystem is heat energy
I need an answer for these two questions
Why are food chains relatively short? O Not enough energy is transferred from one trophic level to the next to support a longer chain. O There are not enough species of carnivores to make the food chain longer. O Longer food chains require more land that is found in today's fragmented habitats. There aren't enough different plant species to support enough herbivore species to support the number of carnivore species needed for longer food chains.
Efficiency of energy transfers in aquatic ecosystem is typically higher than in land ecosystems because ______. a. aquatic food webs include more endotherms b. algae do not make lignin c. primary production cannot occur in water d. all of the above
Figure 46.8 Why do you think the value for gross productivity of the primary producers is the same as the value for totall heat and respiration (20,810 kcal/ m2/yr)?
Which of the following statements is supported by the results of studies at the Hubbard Brook Experimental Forest? a. Most of the energy captured by primary producers is lostbefore it reaches the highest trophic level in an ecosystem. b. Deforested watersheds experience significantly less runoffthan undisturbed watersheds. c. Deforested watersheds lose more calcium and nitrogen inrunoff than undisturbed watersheds. d. Nutrients generally move through biogeochemical cycles veryquickly. e. Deforested watersheds generally receive more rainfall thanundisturbed watersheds.
Organisms at the first trophic level ________. a. capture energy from a nonliving source b. are eaten by organisms at lower trophic levels c. are shown at the top of an energy pyramid d. are consumers
Which are the organisms in one of the food chains in this food web? Who is the producer in the food chain you circled? explain why the hawk in this food web is a trophic omnivore even though it does not eat both plants and animals.
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At which trophic level would you expect the highest amount of biomass? O carnivore O primary consumer O herbivore top carnivore O primary producer
How can primary productivity be expressed/measured? O Both O New chemical energy per unit area and per unit of time O Neither O New biomass per unit area and per unit of time