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Lecture 4

BIOL150 Lecture Notes - Lecture 4: Photosynthesis, Permafrost, Lightning

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Rebecca Rooney

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Types of Terrestrial Ecosystems:
Biomes Ex. Broad-leaved ever green forests, deserts, and grass lands
- Major groupings of plat and animal communities defined by a dominant vegetation type
- Each biome is associated with a distinctive set of abotic conditions
- The type of biome present in a terrestrial region depends on climate
o Climate prevailing, long-term weather conditions in an area
o Weather specific short term atmospheric conditions of temp, sunlight, precip,
and rain
4 Components of Climate
Temperature important because enzymes that make life work only work at an optimal range
of temperature
Moisture important because it is required for life and terrestrial organisms constantly lose
water to environment due to evaporation and transpiration
Sunlight important because it is required for photo synthesis
Wind important because it exacerbates effect of temperature and moisture. Wind increases
heat loss due to evaporation and convection and increases water loss due to evaporation and
- Also has direct impact on organisms (birds)
Nature of the biome that develops in a particular region is governed by:
- Average annual temperature and precipitation
- Annual variation in temperature and precipitation
NPP (Net Primary Production) total amount of carbon that is fixed per year minus the amount
that is oxidized during cellular respiration
- Fixed carbon consumed in cellular respiration provides energy but not growth
- Grow production of biomass
o Biomass the total mass of living plants excluding roots
Types of Biomes
Terrestrial Biomes
- Tropical Wet Forest (Rainforest) : found in equatorial regions
o Plants have broad leaves and are evergreen
o Older leaves are shed throughout the year but there is no complete season loss
of leaves
o High Average Seasonal Temperature but Low Average Seasonal Variation
Mean temperatures never drop below 25 but never exceed 30
o Very High Annual Precipitation and High Annual precipitation
o Vegetation is extremely high favourable year round growing conditions lead to
high productivity at above ground biomass
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