Flashcards in October 1 Deck (31):
Climate change leads to a changing __________
What is a primary succession?
An ecosystem that starts in an area from rocks.
What are the first forms of life in a primary succession?
Lichens and miss because they can survive in harsh conditions
What is the roll of lichen and miss in a primary succession?
To break down rock into soil
What is so special about arbutus trees?
They are Canada's only broad leafed evergreen and can be a primary colonizer
True or false
Gary oaks define our climate
What is the order of a primary succession?
Rocks ---> mosses and lichen ---> herbs and shrubs ---> Heath mat ---> full grown trees
Climate is a ________ limiting factor
What is edaphic climax.
It refers to the chemical composition of soil and what kind of plants it can support
True or false
Edaphic climax can be heat induced.
What is secondary succession?
Vegetation that grows in an area where there was previously an ecosystem. Could be initiated by a fire burning down a forest
True or false
Secondary succession occurs more rapidly in stressful climates than tropical environments.
Why do secondary successions occur more rapidly in stressful environments when compared to tropical environments?
Because in the stressful environment there are more species competing
What are some primary colonizers that are very mobile?
What is an example of a system engineer?
What happens when you remove a forest from land.
Nutrient depletion and leeching
What is a plagio climax?
The soil following deforestation cannot sustain as much growth so the secondary succession may not contain trees
What is a result of plagio climax?
Why would humans introduce non native species to an environment?
For sport (hunting deer) to fix an invasive species problem
What are some examples of invasive species
Eurasian water milfoil
Northern Snakehead (Asian fish)
Knapweed (grassland weed)
What does accidental introduction mean?
An invasive species is introduced to an environment.
It is an invasive species found in grasslands. It has 10% of the energy of grass which is a problem for grazing cattle. It is allelopathic.
What does allelopathic mean?
A plant that exudes chemicals into the soil to inhibit the growth of its competitor plants
What is an 'r' species?
Animals that have lots of offspring but don't invest time in raising them. Have shorter life spans. Quantity over quality
What is a 'k' species?
Animals that have very few offspring but invest a lot of time in raising them
What is an example of an 'r' species?
What is an example of a 'k' species?
Often ___ species consume ____ species.
What is a trophic cascade?
A species higher in the food chain getting reintroduced and it effecting the entire system
What is an example of a trophic cascade?
Wolves in Yellowstone national park