case study

Question 1

JOSEPH
CONNELL’S BARNACLES

Answer 1

Both of these barnacle species could
live anywhere between the high tide
and low tide lines - fundamental
niche

But, abiotic environmental
conditions and competition for
resources (abiotic factor) limit the
size of each species – realized niche

Question 2

Reindeer on St Matthew Island

Answer 2

Reindeer introduced in 1944, increased from 29 to 6,000 in 1963.

Crash die-off the following winter to less than 50

due to limiting factor of food resources (moss)

Question 3

Kaibab Plateau-Grand Canyon National Game Preserve

Answer 3

Overgrazing

Forest Service came up with three options:

Do nothing
Trapping & emigrating deer elsewhere
Open hunting season

Question 4

minamata bay

Answer 4

toxin: mercury and
methylmercury
Chisso factory that produce fertilisers

Question 5

DDT in aquatics

Answer 5

toxin: DDT

reasons of usage:
reduce losses and maximize crop yields (kill pests)

effects:
thinning of the eggshells of birds
humans prone to cancer