Biology 2483A Lecture 8: Bio 2483 Lecture 8
14 Jan 2019
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Unit 3: populations population distribution and abundance. Competition for resources mates, food, space, etc. Eurasion blackbird: monarch butterfly, describe pop by size and density, monarchs might spend summer in us and migrate to mexico in winter table. Passive: air currents, water currents, e. g. , spiders ballooning blowing. Plants cant swim, walk, crawl, etc: adhesion: seed sticks to something and uses it as a carrier, e. g. , burs in the forest stick to us, e. g. , dandelion seeds dispersing, e. g. , coconuts get carried up water streams. Flotation, wind, projection: heathlands, dispersion is important bc pop distribution are being affected by us. Add figures from tb: dispersal, physical limitation (dispersal limitation, not everything can disperse, there are physical limitations. Polar bears can travel up to 1000km per year. Actual distribution doesn"t match theoretical distribution: actual dis shoes swath of green, we know its not uniformally distributed, gonna be patches of it in the map, australia patchy too, density varies across australia.
