Exam 2

Question 1

a (Competition model)

Answer 1

The effect N2 on population growth rate of N1 measured in units of N1

Question 2

B (predator-prey model)

Answer 2

The conversion rate for predators to turn victims into predator offspring

Question 3

Hutchinsons Niche

Answer 3

An n-dimensional hypervolume where dN/dt > 0

Question 4

K selection

Answer 4

K selection is where species give birth to less offspring, but they have higher survivability and live longer. Typically due to population constraints.

Question 5

isocline

Answer 5

A line representing multiple points where dN/dt=0

Question 6

Escape in Numbers

Answer 6

Periodical Cicadas emerge only every 13 years (some 17 yrs). All cicadas emerge at the same time, and the large numbers, synchronous emergence, mean some survive. 13 and 17 are prime numbers, which mean predators must also be on a 13 or 17 year cycle.

Question 7

Underlying Cause of hare-lynx

Answer 7

The hare cycle goes due to vegetation in the area. The lynx actually just follows, the hares cycle.

Question 8

Metapopulation

Answer 8

a set of populations in patches connected by migration

Question 9

Rescue effect

Answer 9

Less isolated patches are unlikely to go extinct because recolonization may occur between breeding seasons.

Question 10

Inhibition Model

Answer 10

each species actively inhibits other species from colonizing; disturbance is necessary to allow new species to replace old ones.

Question 11

Trophic Cascade

Answer 11

Trophic cascades are powerful indirect interactions that can control entire ecosystems

Question 12

Polyploidy

Answer 12

Polyploidy is the heritable condition of possessing more than two complete sets of chromosomes

Question 13

Mid-domain effect

Answer 13

Random placement of ranges leads to peak S in the center of a bounded domain.

Question 14

Chronosequence

Answer 14

A set of sites that differ only in time since disturbance