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Caught in a Web
To the Limit
Community College
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100
Producer, primary consumer, and secondary consumer are all examples of this term.
What are trophic levels?
100
These are always at the "bottom" or "start" of a food web.
What are producers (autotrophs)?
100
A logistic growth curve is often described as having the shape of this letter of the alphabet.
What is an S?
100
Any close ecological relationship between two species is called a this.
What is symbiotic relationship (or symbiosis)?
100
How a species interacts with and uses its habitat is known as the species' this.
What is its niche?
200
Ten thousand kcal of primary consumers can support this number of kcal of secondary consumers.
What is 1,000 kcal?
200
Organisms that must eat to get their energy are known as this.
What are heterotrophs (or consumers)?
200
In the past 500 years the global human population has experienced a reduction in these, resulting in a pattern of rapid exponential growth.
What are limiting factors?
200
In this type of community interaction both species benefit.
What is a mutualism?
200
Organisms with unlimited resources experience this type of population growth.
What is exponential?
300
Most of the energy in a community is "contained" in what trophic level?
What are the producers (autotrophs)?
300
A snail kite eats (surprise) snails. Snails eat green algae. Green algae make their own food. Therefore snail kites are this type of consumer.
What is secondary?
300
Diseases spread faster in crowded populations, so diseases are this type of limiting factor.
What is density-dependent?
300
In this type of community interaction one species benefits and the other is harmed... but the harmed species can often survive.
What is parasitism?
300
The population size at which a logistic growth curve levels off is known as this.
What is carrying capacity?
400
Energy transfer in communities is very inefficient, with about 90% of energy being lost as these TWO things.
What is heat and waste?
400
This type of organism eats both producers and other consumers.
What is an omnivore?
400
Hurricanes, floods, and other natural disasters kill organisms no matter how many of each species there are, meaning they are this type of limiting factor.
What is density-independent?
400
Cattle egrets are small birds that follow around elephants and buffalo, eating the bugs they kick up in the grass. The birds do not influence the life of the elephant or buffalo in any way, so this must be this kind of community interaction?
What is commensalism?
400
If a species is called this it means it has a negative effect on the native community.
What is invasive species?
500
If there are 1,500,000 kcal of producers at the bottom level of an energy pyramid, how many kcal of tertiary consumers are there in the energy pyramid?
What is 1500 kcal?
500
The following symbol is used in a food web to indicate the direction of energy flow.
What is an arrow?
500
This principle states that when two species use the exact same resources one will be better suited to that niche and the other will be pushed into a different niche... or go extinct.
What is the competitive exclusion principle?
500
No one wins in this type of community interaction.
What is competition?
500
Safety in numbers mean populations of most organisms show this type of dispersion.
What is clumped?