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10 Cards in this Set
- Front
- Back
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Give a definition of a primary producer |
Autotrophs/ use the sun’s energy to photosynthesize and survive, producing oxygen as waste (self-nourishers) |
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Give ways that energy is lost through trophic levels |
Lost through heat, used in respiration, waste. |
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Give several trends seen often in the higher levels of food chains |
Higher trophic levels tend to support: fewer species, smaller populations, have a larger body size, lower reproductive rates, food with higher calorific value and a greater assimilation efficiency |
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Give the two ways seconday production can be calculated |
Production = growth + natality Production = net change in biomass + losses by mortality |
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How is growth efficiency calculated? |
Growth efficiency = energy fixed in tissues / energy assimilated |
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How is consumption efficiency calculated? |
Intake at trophic level n / net productivity at trophic level n-1 |
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What are the equations for assimilation, production and growth efficiency? |
Assimilation: energy assimilation / energy consumed Production: energy fixed in tissues / energy consumed Growth: energy fixed in tissues / energy assimilated |
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What is the difference between the grazing and detrital food chain? |
Grazing: primary producers, herbivores, carnivores. Detrital: detritus, decomposer herbivores, carnivores. |
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What is the equation for decomposition? |
Decomposition = sum of component losses attributable to catabolism (K), communition (C) and leaching (L). D = KCL |
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What are the 5 stages of decay? |
AoooL - freshly fallen, undecomposed needles AooF - dark brown, intact recogniseable, colonised fungi F3 - greyish, fragmented, recogniseable needles AoH - humus-like, amorphous mass of animal faeces/microbes A1 - intimate mixture of humus and mineral soil |
