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2.1 - Structure IB Topics 2.1.1-2.1.7
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Biotic and Abiotic Components Biotic 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:
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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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Key Words (define and provide a local example of each) Species Population Habitat Niche Community Ecosystem Parasitism Mutualism Predation Herbivory
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2.2 – Measuring Abiotic Components IB Topics 2.2.1-2.2.2
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Significant Abiotic Factors Terrestrial Ecosystem Marine Ecosystem Freshwater Ecosystem
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2.3 – Measuring Biotic Components IB Topics 2.3.1-2.3.5
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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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Diversity 1. 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 – Biomes IB Topics 2.4.1-2.4.2
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Biomes A collection of ecosystems that share similar climactic conditions
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RainforestDesertTundraTemperate Forest Grassland Prevailing Climate Location Sun Exposure Precipitation Limiting Factors
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RainforestDesertTundraTemperate Forest Grassland Prevailing Climate Hot, Humid, Rainy Hot, DryColdSeasonalVaried by location LocationNear Equator Varied, where no precip Poles40-60 o N Latitude Varied, where some precip Sun Exposure HighVaried, usually high LowMedium, Seasonal Varied PrecipitationHighNoneSnowMedium, Seasonal Low Limiting Factors Too much precip. Not enough water Too cold, permafrost SeasonsLow precip
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2.5 – Function IB Topics 2.5.1-2.5.7
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Photosynthesis
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Respiration
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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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