Succession and Extinction

Question 1

Ecological succession

Answer 1

is a pattern of change that occurs in an ecosystem after a disturbance.

Question 2

Disturbances that might cause ecological succession are

Answer 2

things like wildfire, or flood, or clear cutting, or introduction of a non-native species.

Question 3

There are two types of succession, and both occur after a disturbance.

Answer 3

The first is called primary succession. & second succession

Question 4

primary succession.

Answer 4

succession that occurs on
surfaces where there is no soil after the disturbance

Question 5

Secondary succession

Answer 5

is the succession that occurs on surfaces when the soil remains after a disturbance.

Question 6

major causes of primary succession

Answer 6

is volcanic eruption & glacial movement

Question 7

Primary succession is going to take longer than secondary succession

Answer 7

because the soil needs to occur, needs to be built up in those areas of bare rock before the rest of the succession can take place.

Question 8

cause of secondary secession

Answer 8

Human and natural influences both &One of the major causes of secondary succession is wildfires. and Clear-cutting and Introduced species that do not belong to the ecosystem

Question 9

Will it actually change back to the way it was before?

Answer 9

not always

Question 10

The first species are called pioneer species

Answer 10

These are the first species to populate an area after a
disturbance.

Question 11

A climax community

Answer 11

is a stable community that experiences little succession. In this picture, the climax community would be represented

Question 12

In marine succession, there’s a very well-studied phenomenon called a whale fall community.

Answer 12

A whale fall community occurs when a whale dies and falls to the ocean floor. Think about a whale. It’s a huge animal. All kinds of energy has been vested into that whale to grow
to its size. When it dies, that energy is now available for other species to utilize. Scavengers will come first and feed on the carcass.

Question 13

What is biodiversity and why is it important?

Answer 13

This is really important, because different species support each other in an ecosystem, and this maintains a healthy ecosystem.

Question 14

Biodiversity comes in two basic varieties.

Answer 14

species diversity.&s genetic diversity.

Question 15

genetic diversity

Answer 15

is the changes in the DNA, the different mutations that the different individuals in the species carry. In fact, having lots of genetic diversity encourages the health of species.

Question 16

species diversity

Answer 16

is the variety of different species in a certain area. This is really important, because different species support each other in an ecosystem, and this maintains a healthy ecosystem.]

Question 17

Threats to biodiversity

Answer 17

as habitat loss or fragmentation &Another major issue we have is pollution& pocking

Question 18

losing genetic diversity,

Answer 18

animals will also have fewer mates to choose from and the advantages of sexual reproduction will be gone. Species also can be susceptible to diseases. If all of the genetics of a particular creature are the same and a disease comes along, all of those creatures will be wiped out. But if some creatures carry a resistance to that disease, many individuals will die, but a few will live on to be the parents of the rest of the species.