3.2 Study Guide Flashcards
(17 cards)
Ecological succession
The process of different species and their habitat and how it changes overtime.
Primary succession
Beginning step of ecological succession where the pioneer species colonize an area.
Secondary succession
The second ecological succession after a disturbance did not eliminate all life nutrients from the environment.
Pioneer species
The first colonizers- all organisms with low nutrient requirements.
Seral stages
The stage where ecological succession is advancing to climax community.
Climax community
Endpoint of ecological succession most likely tree environment.
Species Richness
The number of species there are
Species Evenness
How evenly distributed the species are.
Genetic Diversity
The range of different traits within different species.
Ecological Diversity
Variations of in ecosystems- range of habitat types.
Keystone species
Organism that helps define an entire ecosystem
Invasive Species
Animals or species from other areas that don’t belong and could potentially cause harm.
What are differences between primary and secondary succession
Differences between primary and secondary succession are that primary succession is a newly formed area that is being colonized by living things for the first time and secondary succession is when the area has been disturbed or destroyed and they have to go through that ecological succession process for the second time.
How keystone species and invasive species affect biodiversity
Keystone species help maintain biodiversity by regulating the population species while invasive species decrease biodiversity by competing native species for resources.
Calculate the Shannon-Wiener Index value for a community
Site 1 and Site 2
Site 1 Richness 7 Site 2 richness 8
Site 1 # of individuals 20 Site 2 # of individuals 28
You would then add those # of individuals, then take the # of individuals and divide it by what you got when adding. Then you would take the relative abundance and multiply it by itself then LN. You would then add it all up and multiply by negative 1 which will get you your diversity index ( H) then you divide H/LN(R) to get (E) value
Compare and contrast the biodiversity of two communities based on richness, evenness.
If one community has a higher richness than another community you could guess that their might be more of a diverse amount of them compared to a community that might have 4 r value. The closer a communities evenness is to a one the more even that community is and that means that the species are more evenly spread out and not clumped together.
Give examples of primary and secondary succession
Melting, receding glaciers:Primary
Major flooding of creek bed: Secondary.
