Biodiversity & Biogeography
Identify 2 factors that are used to measure species biodiversity.
species richness
relative abundance (species evenness)
What are the 3 sections that would be found on a range of tolerance graph?
optimal range
zone of physiological stress
zone of intolerance
Explain TWO factors that differentiate primary succession from secondary succession.
primary - no soil and takes longer to reach a climax community
List the 4 ecosystem services.
What are provisioning, cultural, supporting, and regulating services?
What is an invasive species?
Non natvie species that has been introduced into a new area and is or likely to cause harm.
According to the theory of island biogeography, what type of island would have the fewest number of different species?
Far from the mainland and small in size
What are THREE abiotic factors that a species might experience a range of tolerance for?
pH, sunlight, temperature
Propose a way in which a scientist could determine if an ecosystem was approaching a climax community.
Record the biodiversity present.
List 3 examples of a provisioning ecosystem service.
food
medicine
lumber
freshwater
What is an adaptation?
What is a trait that by random chance gives an individual a survival advantage in a specific environment. Over time, this trait will become more prevalent in the population as a whole.
Ecosystem A has 5 different species with the following abundances: A - 20%, B - 15%, C - 20%, D - 20%, and E 15%
Ecosystem B has 5 different species with the following abundances: A - 5% B - 25% C - 25%, D - 35%, and E 10%
Which has the higher biodiversity and why?
Ecosystem A
species richness is the same, but A has a more even distribution of each
True or False:
Organisms with a narrow ecological tolerance can thrive in a variety of environmental conditions.
False
Identify TWO examples of primary succession AND TWO examples of secondary succession.
primary - glacial retreat and volcanic eruption
secondary - forest fire and abandoned agricultural field
What are two examples of cultural services that a freshwater lake ecosystem provides?
recreation, tourism, mental health, spiritual health
What is habitat fragmentation? (do not use the world fragment in your answer)
How do humans cause this?
when a habitat is broken into pieces
deforestation, construction of homes and roads
Why is genetic diversity so important within a population of a particular species?
With higher genetic diversity, there is a higher chance that a favorable mutation will arise. This also increases the chances the population will be able to adapt and evolve in the event of a disturbance.
Stress - survive (few individuals)
Intolerance - death (no individuals)
Describe how the introduction of different plant species impacts the formation of soil during primary succession.
Lichens create soil from breaking down rock, the decay of mosses creates a thin layer of soil with few nutrients. As grasses and flowers are introduced and decay more nutrients are added and soil eventually becomes thick enough to support trees.
What are 2 regulating services that a forest ecosystem provides?
climate regulation (absorbs carbon from the atmosphere)
soil formation
What is a pioneer species?
First organism to colonize an area (new or damaged area). Usually lichen, moss or fungi.
What is one anthropogenic activity that leads to loss of biodiversity?
answers will vary
graph must include the zones, title, axis labels and units, bell curve
How does ecological succession affect biodiversity, primary productivity and biomass?
as succession progresses, all 3 increase
Increased species of plants (especially those larger in size) are more productive. This also supports more species of animals that can find habitats so the biodiversity and biomass go up as well.
Due to climate change, some ecosystems are shrinking and others are growing. Provide an example of ONE and explain how it may negatively impact humans.
shrinking - tundra (increased albedo, increased warming due to melting of the permafrost)
growing - desert (decreased productivity and water supplies)
What is the end stage of ecological succession known as?
climax community