Competing critters? Tree lizards are usually found on trees, while canyon lizard

Question

Competing critters?

Tree lizards are usually found on trees, while canyon lizards are usually found on rocks. Both species feed on small insects which emerge shortly after spring rains. One summer, a researcher removed tree lizards from two plots while leaving them present in two other plots. Populations on all four plots were monitored by marking and recapturing lizards. After several months, canyon lizards in the experimental plots started using trees as well as rocks. They also survived better and thus became more abundant in the manipulated plots compared to the control plots.

Use this information and your knowledge of biology to answer questions 11-15.

11. The number of replicates for each treatment equals the total number of lizards on both plots.

True

False

1 points   

QUESTION 12

Tree lizards likely compete with canyon lizards.

True

False

1 points   

QUESTION 13

Tree lizards limit the realized niche of canyon lizards.

True

False

1 points   

QUESTION 14

Since the two species normally coexist, the carrying capacity of tree lizards must be lower than the carrying capacity of canyon lizards.

True

False

1 points   

QUESTION 15

The two species coexist by spatially partitioning their environment.

True

False

Explanation / Answer

11. The number of replicates for each treatment equals the total number of lizards on both plots.

True . Only then experimental results hold good.

12. Tree lizards likely compete with canyon lizards.

True

They compete for their niche and so they have two different places to inhabit.

13. Tree lizards limit the realized niche of canyon lizards.

True

Realized niche is a actual space that an organism can inhabit and the resources it can access as a result of limiting presurre from other species.

14. Since the two species normally coexist, the carrying capacity of tree lizards must be lower than the carrying capacity of canyon lizards.

True

As canyon lizards survived better and became more abundant than the tree lizards after several months the carrying capacity is more for them than tree lizards.

15. The two species coexist by spatially partitioning their environment.

True

Competative co existance in a spatially heterogenous environment attribute to niche difference.

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