01:119:115 Lecture Notes - Lecture 28: Aspirin, Allele Frequency, Extinction Vortex
21 Apr 2016
School
Department
Course
Professor
Document Summary
Global extinction (all ecosystems: biodiversity and human welfare. Local extinction in one ecosystem can impact other species in that ecosystem. Biophilia- sense of connection to nature and living systems. Can obtain medicine, food, fiber from plants (i. e, aspirin, quinine) Genetic resources - useful things in an organism"s genes could improve crop species (resistance) Ecosystem services - natural ecosystems help sustain human life. B. 4. e) air/water purification waste decomposition crop pollination reduce impact of extreme weather no monetary value ecosystem services undervalues: threats to biodiversity. Habitat loss due to agriculture, urban development, mining, pollution, fragmentation. C. 2. a) accidental and intentional movement of species from native locations to a new geographic region by humans (responsible for ~40% extinctions); problematic in islands bc small populations. C. 2. c) in native habitat limited by predators, parasites, pathogens in new habitat few constraints. Over harvesting - harvesting of wild organisms at rates greater than ability to rebound; most at risk if (1)restricted habitats and (2)low reproductive rate.
