1 |
An insect, less than half a centimeter
long, threatens the life of a tree. |
c |
2 |
A bark beetle destroy stands of trees. |
w |
3 |
Its scientific name, dendroctonus, means "tree
killer". |
c |
4 |
The tree are a source of food and shelter for the
bark beetle. |
w |
5 |
The mother beetle chew and tunnel between the bark
and the wood. |
w |
6 |
She lays her eggs in between the bark and the wood. |
c |
7 |
Larvae hatch from the eggs and eat out their own
tunnels. |
c |
8 |
This destroys tree tissues and causes branches to
wither and dies. |
w |
9 |
Bark beetles cause the death of many trees. When
there are fewer trees to feed on, the beetle population
declines and the forest can recover. |
c |
10 |
The numbers of most organisms are limited by food
supply. |
c |