Exam 4: Ecosystems Are Dynamic

Allelopathic species ________.

The theoretical final stage in the successional process is called a ________.

In Canada, ________ species of alien plants have developed into agricultural pests.

The biotic potential of K-strategists is higher than that of r-strategists.

R-strategists ________.

Ecosystems with ________ can best withstand human interference without experiencing serious damage.

Did European colonization cause the first extinctions in North America? Explain why or why not.

Lichens are often the first colonizers in primary succession.

Mature ecosystems are NOT characterized by ________.

The fossil record suggests that almost ________ of species that have lived on Earth are now extinct.

________ refers to the process whereby a species is eliminated because it can no longer survive under new conditions.

What is driving treeline change in Northern Canada?

A feedback loop that exacerbates existing change is a ________.

The phenomenon of seed release due to the high temperatures associated with fire is termed ________.

Coevolution occurs when ________.

Native species can attain undesirable numbers and cause harm in their own ecosystems.

________ was the major factor in the extinction of camels in North America prior to European colonization.

The effect of increased temperatures in Northern Canada would increase polar amplification.

Phyletic evolution leads to ________.

________ is the process in which a population has undergone so much change that it is no longer able to interbreed with the original population.