Populations - Succession

Question 1

Ecological Succession

Answer 1

This is the definite, seasonal, directional, continous pattern of colonization and extinction on a site by a species population

Question 2

Examples of disturbances to an ecosystem…

Answer 2

Discrete removals of organisms, disruption of communities by influencing space or food resource, or changes in physical envrionment

Question 3

Disturbance colonisaing…

Answer 3

COloniser takes advantage, inhabiting an opening of which they may not be able to maintain their presence.

Question 4

How can colonization be predicted?

Answer 4

The first invaders are fast growign, capable of exploiting resoruces, whilst the later tolerate lower resource, growing to maturity in another species presence.

Question 5

Primary Succession

Answer 5

Where a new patch of land is created/exposed for the first time

Question 6

What does primary succession entail?

Answer 6

Seqence of species inhabiting, following opening, like lava flow or glacial retreats.

Question 7

Secondary Succesion

Answer 7

This is where vegetation is partially/completely removed, but soils remain fertile and spores well-developed, invasion of subsequent species

Question 8

Chronosequence

Answer 8

Refers to a sequence of communites corresponding to different lenghts of time since onset of succession

Question 9

Example of secondary succession in abandoned field…

Answer 9

USA farmaldns following frontier where precolonial conifer-hardwood trees with swift regeneration, reflected in successional stages in various sites.

Question 10

Clements view on successional theory…

Answer 10

A pioneering species dominantes a niche, modifying it to the point another species can invade and do the same until a climax community is established.

Question 11

Gleasonian theory on succession…

Answer 11

Successsion reflective of independent species dispersal and establishment, surviving at particualr sites based on envrionmental conditions.