Lecture 7- January 18th

Lecture 7- January 18th - January 18, 2012 Invasive...

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January 18, 2012 Invasive species: People in ships specialize in bringing things into the Great Lakes and back. Most ocean species cannot live in the Great Lakes because the salinity is different. Some species can cross from one to the other If you are coming from the lakes in Europe or Asia, if any of it was freshwater than that is a concern – the idea is to balance the water There are certain restrictions such as in Hamilton: to not exchange the water when on board because some invertebrates such as zebra muscles (invasive species) stick to the bottom of containers and holes- there is a concern because if water was exchanged- possibility to introduce these invasive species into an area. Biomes Biome: o Is a kind of ecosystem o Large, relatively distinct region o The biome is at the top of the hierarchy (individual->population-> biomes) o Biome is a way of generalizing an area Geographic, biological and physiological way of dividing things o Characteristic determinants which are common to the area Climate: precipitation/temperature Precipitation Soil: bedrock or soil or mixture of both Organisms Map: o Different biomes make up Canada o Within a biome some species wander through several biomes within a year Animals tend to move large ranges Example: migrating birds that go from Northern parts (Arctic biomes) o Biome is a way of generalizing an area o Hamilton is the mixed wood plains biome But this area no longer looks like the mixed wood plains which contains thick forests – mixed deciduous forests Forests which lose their leaves Instead we have lots of agriculture It was thick forests: the first settlers found it scary and ugly because the forests were thick and there were big predators which was terrifying for early European settlers Matter cycling Nutrient cycles: o Biogeochemical cycles; means why which nutrient elements and their compounds cycle continuously through atmosphere, hydrosphere, lithosphere and biosphere
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o Certain elements are active in the biosphere, same elements tend to be active in other spheres o Humans are made up of? Carbon Where else on earth is there carbon? Rocks: carbonate – made up of carbon, oxygen and calcium Carbon dioxide dissolved in the ocean, lakes, rivers, groundwater o Carbon dioxide is a weak acid- acidifying the ocean slightly Wood (tree) Plants have lots of carbon Fossil fuels have carbon Soil has carbon – made up of old bits of plant, animal and rocks Carbon found in atmosphere as well Cycle means to not just have carbon locked in different places- moving from one
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Lecture 7- January 18th - January 18, 2012 Invasive...

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