Exam 4: Species Interactions and Community Ecology
Use the figure above to answer the following question
-Chaparral has a climate most similar to _________________
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Discuss the interrelationship between sea otters, sea urchins, and kelp in the Pacific Ocean.
At one time sea otters, sea urchins, and kelp lived as part of balanced ecosystem. The base of the food chain is kelp, a large rooted marine alga. Kelp is fed upon by sea urchins and the sea urchins are a favorite food of sea otters. When sea otters are present, they feed on sea urchins, keeping their numbers down allowing luxuriant kelp forests to thrive. But, in the absence of sea otters, the sea urchin population explodes. Sea urchins eat kelp, so kelp beds were destroyed as the sea urchin population expanded. This was devastating for the ecosystem because kelp is habitat for many fish and invertebrates. Without kelp, the biodiversity and stability of the ecosystem was reduced significantly. This story illustrates the interrelationship of organisms within ecosystems and establishes sea otters as a prime example of a keystone species.
______________ are typical primary consumers in a temperature deciduous forest.
The statement, ʺhiking up a mountain in the southwestern United States is like walking from Mexico to Canada,ʺ is meant to demonstrate that ______________ change(s) rapidly as you change altitude and latitude.
Global climate change may produce major shifts in biomes for any given location because ______________
Discuss the differences between intraspecific and interspecific competition.
Zooplankton populations in Lake Erie and the Hudson River have declined by up to 70% since the arrival of zebra mussels because ______________.
Choose the item that best matches from the following:
-Describes biome in the eastern United States, north central Europe, and eastern China; characterized by stable precipitation and seasonal temperature variation
Choose the item that best matches from the following:
-Describes Cairo, Egypt, and northwest Mexico; characterized by sparse rainfall and much variation in temperature
Choose the item that best matches from the following:
-Describes an equatorial zone with moderate precipitation that fluctuates seasonally; characterized by warm temperatures year round
Environmentally and economically acceptable means of controlling introduced invasive species include ______________
List the three major trophic levels in a food web. What types of organisms are found in each level? Where are the autotrophs and heterotrophs found? Discuss the significance of each level for the integral functioning of the food web.
Use the figure above to answer the following question
-Temperate deciduous forests are characterized by _______________.
The energy content and biomass of ______________ is lowest in any food web.
Use the figure above to answer the following question
-According to this diagram, you should find _____________________.
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