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Island Biogeography
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Mangrove islands off the Florida coast
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Mangrove Island Close-Up
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Dan Simberloff on Mandolin Nick Gotelli on Guitar
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Simberloff’s defaunation experiment on Mangroves
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Results from Simberloff’s Experiment
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Results from Simberloff’s Experiment pt. 2
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Island Effect Why are there fewer species on islands than on equal sized areas of mainland? Differences purely to area? Differences due to mainland having more complex habitat?
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Bracken Fern
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Bracken Fern - Australia
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Number of species found on Bracken Fern
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Picture Winged Drosophila
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Picture Winged Drosophila – more than 500 species from 1 ancestor
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http://www.youtube.com/watch?v=x- r_YhATOYA&list=PL6C606070246F1C81 &index=6http://www.youtube.com/watch?v=x- r_YhATOYA&list=PL6C606070246F1C81 &index=6
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Cichlid Diversity
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African Rift Lakes
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Cichlids from Lake Tanganyika (left) and Lake Malawi (right)
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Age of African Rift Lakes Lake Tanganyika – 12 million years old; about 250 species of cichlids; 80% endemic Lake Malawi – 5 million years old; about 700 species of cichlids; again 80% endemic Lake Victoria – 250,000 to 750,000 years old; about 400 species of cichlids – over 80% endemic
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The dodo What makes species vulnerable to extinction?
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What makes some populations or species vulnerable to extinction?
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Rare species are more vulnerable to extinction Remember Rabinowitz – three factors determine rarity: 1.Geographic range 2.Width of habitat use 3.Local population size
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Passenger pigeon
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Passenger pigeon
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Allee Effect Some species have a minimum requirement for population size in order to successfully breed
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Characteristics that predispose species to becoming extinct 1. habitat overlap - the species occupy habitat that is desirable to humans and lose out in competition with humans for the habitat - tallgrass prairie species 2. human attention - species suffer because singled out by humans - either desired as food or fur and hunted heavily (passenger pigeon, dodo, northern elephant seal); or disliked by humans and killed as varmints (wolves, African wild dogs) 3. large home range requirements - animals needing large areas can’t find large enough areas in human dominated landscape - California condor, polar bear 4. limited adaptability and resilience - salmon return to natal stream to reproduce; won’t go elsewhere
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Habitat overlap – Konza Prairie, Kansas
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Human attention – African wild dog
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Large Home Range Requirements - California Condor
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Limited adaptability and resilience - Coho salmon
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Salmon Life Cycle
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Coho Salmon support 137 species
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Additional factors Species in which population size is declining Animal species with large bodies Species that are not effective dispersers Seasonal migrants Species with little genetic variability Species with specialized niche requirements Species usually found in stable, pristine environments Species that form permanent or temporary aggregations Species that have not had previous contact with people Species closely related to other species that have gone extinct or that are endangered
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Species in population decline – barn owls
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Species with large home ranges – Polar bear
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Animals with large bodies
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Species that are not effective dispersers - Freshwater Mussels
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Seasonal migrants such as Blackpoll Warbler
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Species with little genetic variability – Madagascar fish eagle
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Species with specialized niche requirements – hummingbird flower mites
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Species usually found in stable, pristine environments
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Species that form permanent or temporary aggregations
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Species with little or no prior contact with people – Western Australia flora
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Species related to other extinct or endangered species - Cranes
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Worldwide Endangered Species
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Endangered tree species - worldwide
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Rare and Endangered Species in Japan
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Endangered species in Canada and the US – as of 1990’s
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Threatened and Endangered Species
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Threatened And Endangered Species in Illinois
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Four-toed salamander – found at Green Oaks
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Past Climate Change
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Coring Glacial Ice
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Ice Core Data
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Pollen core data collection
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Pollen Core Data
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Distribution of North American Trees in past 16,000 years
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Black-tailed prairie dog
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Northern bog lemming
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Eastern chipmunk
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Global Ice Coverage Last Ice Age
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Rainforests in: a. Glacial period, b. Inter-glacial period
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Global carbon cycle
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Carbon dioxide concentration at Mauna Loa
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Change in Average Global Temperature
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Statistics and climate change http://www.youtube.com/watch?feature=pla yer_embedded&v=e0vj-0imOLwhttp://www.youtube.com/watch?feature=pla yer_embedded&v=e0vj-0imOLw
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Surface temperature trends from 1800-2009 http://www.guardian.co.uk/environment/vid eo/2011/oct/20/berkeley-earth-climate- change-videohttp://www.guardian.co.uk/environment/vid eo/2011/oct/20/berkeley-earth-climate- change-video
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Model predictions of global temperature increase
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Predicted surface change 1960-2060
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Current distributions of biomes
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Predictions for biomes after global warming
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The Earth Ice Free
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Global Ice Coverage Last Ice Age
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Will species be able to survive current climate change? Maybe Maybe not
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New Complications with Climate Change 1.Current species and populations may already be stressed by habitat loss and environmental degradation 2.Habitat loss will make it harder for species to migrate to new areas 3.Global temperature may increase to temperatures that are much greater than species experienced in the past 4.Rate of global climate change is probably faster than in geologic past
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Pikas may run out of mountaintop
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