Ch 55 – Conservation Biology
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Transcript of Ch 55 – Conservation Biology
![Page 1: Ch 55 – Conservation Biology](https://reader035.fdocuments.in/reader035/viewer/2022062408/5681349a550346895d9b91f2/html5/thumbnails/1.jpg)
Ch 55 – Conservation Biology
![Page 2: Ch 55 – Conservation Biology](https://reader035.fdocuments.in/reader035/viewer/2022062408/5681349a550346895d9b91f2/html5/thumbnails/2.jpg)
• Focus on loss of biodiversity, due to human activities
• Increased rates of extinction
![Page 3: Ch 55 – Conservation Biology](https://reader035.fdocuments.in/reader035/viewer/2022062408/5681349a550346895d9b91f2/html5/thumbnails/3.jpg)
Biodiversity
• 3 main levels:• 1) Genetic diversity
• 2) Species diversity
• 3) Ecosystem diversity
![Page 4: Ch 55 – Conservation Biology](https://reader035.fdocuments.in/reader035/viewer/2022062408/5681349a550346895d9b91f2/html5/thumbnails/4.jpg)
Human impact• Habitat Destruction:• 90% of world’s plant activity takes place where
people play a significant role• 38% of earth’s ice-free land has been been
cultivated for farming• Destroyed original forests in N. America &
Europe, deforestation of tropical rainforests• Use of fossil fuels has warmed atmosphere• Pollution affects oceans
![Page 5: Ch 55 – Conservation Biology](https://reader035.fdocuments.in/reader035/viewer/2022062408/5681349a550346895d9b91f2/html5/thumbnails/5.jpg)
Human impact• Overexploitation– Overfishing – California Sardines – harvested to brink of
extinction in early 1900’s– Collapse of orange roughy, Chilean sea bass, blue
fin tuna populations
Estimated that overfishing has reduced large fish populations to 10% of pre-industrial population
![Page 6: Ch 55 – Conservation Biology](https://reader035.fdocuments.in/reader035/viewer/2022062408/5681349a550346895d9b91f2/html5/thumbnails/6.jpg)
Introduced species
• – Kudzu in South -introduced for erosion control
•
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• - Burmese python in Florida – exotic pets, now established in Everglades
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• - Asian carp in Great Lakes• Aggressive, out compete native fish
![Page 9: Ch 55 – Conservation Biology](https://reader035.fdocuments.in/reader035/viewer/2022062408/5681349a550346895d9b91f2/html5/thumbnails/9.jpg)
Bioaccumulation
• Accumulation of substances (i.e. toxins, pesticides) in an organism
• We are surrounded by chemicals:• In personal products, furniture, food, etc.
• i.e. Phthalates – shampoo, soap, lotion– Can cause reproductive disorders
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Biomagnification
• Poisoning of small consumers can be passed along the food chain to affect the consumers later on.