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BIO3547 (6)
Lecture 6

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Breid Mc Ilkenny

• biome: terrestrial environment defined by grown forms of plants (forests, tundra) o plant distribution influenced by temp and rainfall o one set of graphs plots seasonal patterns of temp and precipitation at a site in a biome o some graphs show activity patterns of different kinds of organisms / year; levels of biological activity shown by width of horizontal bars o species richness: number of species present in communities • boundary btwn biomes is arbitrary; gradually merge into another • tundra biome: arctic and high elevations in mountains everywhere o in Arctic t, vegetation is underlain by permafrost—soil who water is permanently frozen; soil may thaw in short summer  little precipitation but very wet b/c water can NOT drain through permafrost  plant grow for few months/year  animals migrate into area for summer or are dormant for most of year o tropical alpine t: photosynthesis and most bio activities continue (slowly)  more plant forms present • boreal forest: toward equator from Arctic t, lower elevations on mountains o winders long and cold, summers short, warm o evergreen tress b/c ready to photosynthesize as soon as it gets warm o NH: has evergreen coniferous gymnosperms; SH: southern beeches o Temperate evergreen forests: grow along western coasts of continents at middle to high latitudes; winters mind and wet, summers cool and dry; earth’s tallest trees o few tree species; moose, hares; seeds of conifersrodents, birds, insects • temperate deciduous forest: eastern NA, eastern Asia, Europe o temps fluctuate btwn winter and summer, precipitation evenly distributed o deciduous trees dominate; more tree species than boreal o many genera or plants+animals shared in those 3 separate regions • temperate grassland: areas dry for much of year o hot summers, cold winters; converted to agriculture o in some, most precipitation falls in water, others in summer o vegetation = simple – perennial grasses, sedges, forbs (colourful) o plants adapted to grazing and fire; store energy underground and resprout • cold desert: dry regions at middle to high latitudes; esp in continents in rain shadows of mountain ranges o seasonal temp changes great; dominated by few species of low-growing shrubs; annual productivity is lo
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