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Lecture

april 4,2013.docx- lecture notes inclass

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Department
Biology
Course Code
BIOLOGY 1M03
Professor
Ben Evans

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April, 4 , 2013 Disturbance disrupts succession  A community can be disrobed by many ways  Pioneering species, arent doing well on the ground  When a tree falls, it takes down many other trees  Increases biodivestiy , because you opened to pioneerin species can come in , climax species  Other habitats of disburances, natural seelciton shapes to cope with the tragedy  Forest fire has gone thoruhg area, for pic on the right  Habitat is perfect for floren require early succcesional species  Fire sweeps through , lots of lighning storms ,- sandy nature makes it very  Low palm trees have fan like leaves, survive the fire  Wire grass is a type of grass that grows , recovers quickly so grows quickly after the fire  Slash pine lives for longer,have dense needles, fire comes through quickly through this , protect with dense needles, so when it gets big enough it drops the , so fire doesn’t catch on it  Florodo scrub dees  Wind changed direction, and fire was streaming towards head quarter Disrubance ...  African elelpahsn are , can push large trees and open habitats  Can act as a disturbance force in Africa  Efforts have been done to call habitats  Elepahns and climate combined created desertification Sucession after disturbance  After disrbance  Corn field, is a human ditubrance, if you leave it for long enough y, pioneer species wil change moistrure conditions, other plants would move in  Conditions are changing, secondary condition start after a disburance is happend  Climax , tolerance and inhibition and faciltaiton depending on which speces were there you can find out whi Some communities are mosaics of patches at diff stages of succession  Some competive species , around pioneer species that take advantage  Intermediate levels of disurabcen can lead to elevated to biodersity  So can ahve mixtures of pioneering , climax speices, and between Island Biogeography  Islands are imp soruce of biodvierstiy  Lost to extension would  Cutting off gene flow for epciation to occur,  For evolution ot crate new species  Mac Arthur and Wilson established island biogeography theory  How far away from the content o  Every island would have same equilibrium species between incoming flow of new pseices , versus the rate of existence  Imigartion rate balances the existence is where the equilibrium is reached and thats how many species would last on the island Krakatau  Island starts fro mscrathc  Emerged form sea, lost all life after the lava and stuff  Nothing but lava,  Over time, palnts and amians rained ,  Seeds, were borught by storms and stuff, so ioneers early immigrants arrived first  Early groups- are strong dispers like seds  Rate of arrivela of new spe, strong dispersals arrived there early ,birds arrive quickly enchance the rate of immmigartns as the strong dispers arrive and establish  With time, island gets coreded  Competive species outcompete with un comepentive species, and so equilibrium species is established  Equilibrium number of sepcies, not talking about every speices  We don’t know all the species  Look at biggest group vert Isalnd BIogeogrpah  Islands don’t have to be in water  Anything where you have a siuitbale habitat by non-suitable habitat  Close to shore, where there is ltos of speoces on content  Small island , which has little area, far from the contintent  Bigger, but eqully distane  Size of island, if you ahve enough space, can have good population ,so hif a climate disaster hapend, you can have , close to land which increases immigrants, so low rates of extinction  So lots of epceas, to reduce rate of extinction ICLicker---E Because c is too small island, so going to ahve high existence rate and its far enough from the island Great Basim mountain  Not an island around water  Maises, elevated flat land of diff sizes that attract boreal species, because of high altitude  Size of maises, importan
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