Marine Communities Review

Wrasse fish feed on the parasites found on the black sea bass’s body. The wrasse fish get a meal and the black sea bass is helped by the removal of the parasites.

• parasitism
• commensalism
• mutualism

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Which is the best description of an ecosystem?

• all of the living and nonliving things in an area
• all of the individuals of one species in an are
• all of the populations of living things in an area
• all of the abiotic factors in an area

Animals of the same species would most likely compete over a limited amount of -

• minerals
• Oxygen
• sunlight
• mating partners

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What factor would cause animals of the same species to begin competing with one another?

• increase in precipitation         
• the presence of decomposers
• the introduction of a new food source
• limited supply of resources

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Gobies are a type of small fish that live in small burrows.  Sometimes these burrows are created and maintained by burrowing shrimp.  The goby shares the burrow with the shrimp and uses it to protect its eggs.  The shrimp has poor eyesight, but monitors the behavior of the goby with its antennae.  When it feels the shrimp retreat into the burrow away from danger it quickly follows.  This relationship demonstrates which of the following? 

•  parasitism  
• mutualism 
• commensalism 
• predation

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Remora are small fish with a sucker-like organ that allows them to attach themselves to larger animals like a shark.  By doing this, the remora is able to gain protection from the presence of the shark while helping the shark stay clear from parasites.  This relationship shows _?

•  parasitism
• mutualism       
• commensalism
• predation

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What type of symbiosis is this?
*Hermit crabs find shells left by snails that have died and move in.
*  Snails die and leave behind their shells.

• commensalism
• mutualism
• parasitism
• predation

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Populations consist of

• a single species

• multiple species

• the biotic and abiotic factors of an environment

• a grouping of ecosystems

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Based on the graph shown, how can you tell sea otters are a keystone species?

• as the sea otter population decreases, biodiversity increases
• as sea otter population increases, biodiversity increases
• changes in the sea otter population have little effect on biodiversity 
• the sea otter population dereases due to the presence of urchins

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When put together, one organism outcompetes the other for resources.  This is an example of:

• competitive exclusion principle
• speciation
• biological niche
• evolution

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