topic 2 – the ecosystem 2.1 - structure ib topics 2.1.1-2.1.7
DESCRIPTION
Key Words (define and provide a local example of each) Biotic Species Abiotic Population Trophic Level Community Producer Habitat Consumer Ecosystem Autotroph Niche Heterotroph Competition Carnivore Mutualism Herbivore Parasitism Omnivore PredationTRANSCRIPT
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2.1 - StructureIB Topics 2.1.1-2.1.7
Topic 2 – The Ecosystem
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Key Words (define and provide a local example of each)
Biotic Abiotic Trophic Level Producer Consumer Autotroph Heterotroph Carnivore Herbivore Omnivore
Species Population Community Habitat Ecosystem Niche Competition Mutualism Parasitism Predation
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Biotic and Abiotic ComponentsBiotic
All living components of the ecosystem
Ex:
Abiotic All non-living
components of the ecosystem
Ex:
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Food Chains The position an organism occupies in a
food chain is called the trophic level.
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Local Food Chain Example:Make your own food chain with Wisconsin species.
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Food Webs Ecosystems
contain many interconnected food chains
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Pyramid of Numbers A graphical model
of the number of organisms in a food chain
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Pyramid of Biomass A graphical model
of the amount of biomass present in a food chain at a certain point in time
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Pyramid of Productivity A graphical model
of the rate of energy production over time
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Top CarnivoresBioaccumulation
Toxins (pesticides, etc.) can be retained in fat tissue
Biomagnification
Each successive trophic level gains more toxin
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2.2 – Measuring Abiotic ComponentsIB Topics 2.2.1-2.2.2
Topic 2 – The Ecosystem
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Significant Abiotic FactorsTerrestrial Ecosystem
Includes: land Temperature Light intensity Wind speed SOIL• particle size• moisture• drainage• mineral content
Marine Ecosystem
Includes: Oceans, estuaries, salt marshes and mangroves salinity temperature wave action dissolved
oxygen pH
Freshwater Ecosystem
Includes: lakes, rivers, streams,
wetlands turbidity temperature flow velocity pH dissolved
oxygen
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2.3 – Measuring Biotic ComponentsIB Topics 2.3.1-2.3.5
Topic 2 – The Ecosystem
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Estimating abundance of organisms Counting the
number of organisms is almost always done using an estimate
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Lincoln Index A mathematical
model to estimate population size
Capture-mark-release-recapture
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Example 1
13 deer were caught and marked
14 deer were caught the second time and 5 were marked
Example 2
75 Ladybugs were caught and marked
80 Ladybugs were caught the second time and 3 were marked
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Quadrats A square of area
used to measure the population of non-mobile organisms Can help to
calculate population density and percentage cover
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Diversity1. The number of
different species
2. The number of individuals of each species
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Simpson’s Diversity Index Used to compare
diversity between areas
High value of D implies stable ecosystem
Low value of D implies unstable ecosystem
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2.4 – BiomesIB Topics 2.4.1-2.4.2
Topic 2 – The Ecosystem
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Biomes A collection of
ecosystems that share similar climactic conditions
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Rainforest
Desert Tundra Temperate Forest
Grassland
Prevailing Climate
Location
Sun Exposure
Precipitation
Limiting Factors
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Rainforest
Desert Tundra Temperate Forest
Grassland
Prevailing Climate
Hot, Humid, Rainy
Hot, Dry Cold Seasonal Varied by location
Location Near Equator
Varied, where no
precip
Poles 40-60o N Latitude
Varied, where some precip
Sun Exposure
High Varied, usually
high
Low Medium, Seasonal
Varied
Precipitation
High None Snow Medium, Seasonal
Low
Limiting Factors
Too much precip.
Not enough water
Too cold, permafrost
Seasons Low precip
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2.5 – FunctionIB Topics 2.5.1-2.5.7
Topic 2 – The Ecosystem
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Photosynthesis
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Respiration
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Energy Flow Through the Ecosystem
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Gross Primary Productivity (GPP)The amount of
energy produced by producers
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Net Primary Productivity (NPP)The amount of
energy stored by producers and available to consumers
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Gross Secondary Productivity (GSP)The amount of
energy consumed by consumers
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Net Secondary Productivity (NSP)The amount of
energy stored by consumers and available to the next trophic level
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Simplified Example:
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2.6 – ChangesIB Topics 2.6.1-2.6.7
Topic 2 – The Ecosystem
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Carrying Capacity The maximum
number of organisms an ecosystem can support sustainably over a long period of time
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Limiting Factors Factors that limit
the amount of individuals in an ecosystem
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Tolerance Species will be most abundant within a
certain range of a limiting factor
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Population CurvesS Curve
Reaches carrying capacity and stabilizes J Curve
Unchecked population growth
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Limiting Factors Density-
dependent factors Limit population
size more as population increases
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Limiting Factors Density-
independent factors Limit population
size regardless of population size
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r-strategists Opportunistic
species Inhabit
unstable/changing environments
Reproduce early/often, mature quickly
Slow growing/maturing species
Few offspring Long lifespans
K-strategists
C-strategists In between r & K
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Survivorship Curve
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SuccessionA natural increase in the complexity of
the structure and species composition over time
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SuccessionPrimary
Occurs on uncolonized substrate (rock)
Secondary Occurs where a
previous community has been destroyed
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Zonation Different
types of ecosystems in a gradient due to elevation or resources Ex: Altitude
zonation on a mountain
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Climax Community A stable, complex
ecosystem in a late stage of succession
Characteristics:
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2.7 – Measuring ChangesIB Topics 2.7.1-2.7.3
Topic 2 – The Ecosystem
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Environmental Impact Assessment
Before any development gets permission to begin, an EIA must be done
Predicts the potential impacts on habitats, species, and ecosystems
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Baseline Study Habitat type Species list Species diversity Endangered
species Land use Hydrology Human population Soil quality