Chapter 3Changes in Ecosystems

Science 10 - Biology

Natural Selection

The process in which, over time, the best-adapted members of a species will survive and reproduce. This process makes change in living things possible.

Adaptive Radiation

The development of a number of new species from a common ancestor; the new species are adapted to inhabit different niches.

Succession

• Primary succession• Secondary succession

1. Primary Succession

• No soil

2. Secondary succession

• Has soil

1. Primary succession inpictures...

VS.

What are the differences?

What are the differences?

POP QUIZ

Is this an example of:A) primary successionB) secondary successionC) BioremediationD) Adaptive radiation

Is this an example of:A) primary successionB) secondary successionC) BioremediationD) Adaptive radiation

An example of the first pioneer species?

A) mossB) lichenC) deciduous treesD) coniferous trees

An example of a pioneer species would be: A) moss

B) lichenC) deciduous treesD) coniferous trees

Summary• As succession increases in time

– # of species…………………………increases– Total population……………………increases– Total Biomass………………………increases– Organic Matter……………………...increases

Volcano

Life After People

Humans Influence on Ecosystems???

Humans Influence on Ecosystems…