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Biological Sciences
Rudy Boonstra

BIOC58Final Exam Notes Lecture 6Biological Impact of Climate Change BackgroundIf we turn off conveyor belts of the ocean we are in big trouble o They are carbon sinkswill release a lot of carbon into the already carbon filled atmosphereBiological Impacts of Climate Change o NicheThe niche space of species may overlap to a greater or lesser extentCan divide an organisms habitat to what they need can be n dimensional they have a range of temperatures and moisture that they do well inCan extend to all the variable organisms have to deal with Fundamental Niche the full range of environmental conditions and resources an organism can possibly occupy and use especially when limiting factors are absent in its habitat when two organisms live in the same area with some overlapping of niches that area is where there will be competitiontwo complete competitors cant live together is fundamental niche going to be present in the world that is coming o ToleranceThe tolerance zone is measured for the stage of the life cycle that is most sensitive to temperature or moisture and is subdivided into two zonesthe optimal zone middle range and the marginal zone just out of optimal rangeThis can be applied to any environmental factor Shows environmental variable and an how much an animal can tolerate a range of temperature optimal and marginal is how much the animal can tolerateDeer when show falls if its really high snow fall they cnat walk and they cant find food or they can get eaten but when its low snow fall they can do the tasks they need to surviveNarrowest range will control distribution could be temperature or moisture exam questionShelfords Law The distribution of a species will be controlled by the environmental factor for which the organism has the narrowest range of tolerance o Geographic RangesWhere do they occur Why do they occur Needles are losing water and if they cant take up water fast enough for how much their losing they began to die because they cant take up what theyre desiccatingPlant dies because the land is frozen and it cant get water it Isotherm temperature at which it can survive as climate is increasing the isotherm for organisms is moving more northwards and thus northern countries like Canada are more likely to be effected by more viruses o EcotypesIs a subspecies or race that is especially adapted genetically to a particular set of environmental conditions All individuals within a species are not the sameSpecies of same type can interbreedCollected plant along various elevations and then grew them at the same elevation after to grow all in same condition to see how they grow in a common garden when grown here they maintain their original growth and how they grow Ecotypes show a genetic diversity within a speciesAs climate changes not all species can live there climate window is changing and not lots of the species can still live there because they cant adapt fast enough Migration is important they need to be able to move fast enough before the window closes and they miss itWhen they move into the new environment they MAY change speciesYou would want to plant trees from different areas because the world is changing and you would want it to grow in the futureo Community Organization Not true until we test it Organisms live beside other organisms some help them so are neutral and some are detrimental Are communities like human body take something away is it detrimentalWorld is not like this every plant has to meet its tolerance limitsC is not mutually exclusive There are dominant species There arent sharp continuums Tree species cant live beside each other if they have the same niche one will take over the otherB and D are ideal models while A is the worst o Extinction Processes We are going through a major extinction phase due to anthropogenic causesIt can be caused by stochastic random events dispersal barrier of some sort or its suitable habitat temporarily disappears o Species RangesFundamental problem glaciations We are now in an interglacial period
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