BIOL 152 1st Edition Lecture 30 Outline of Last Lecture I. Nichesa. Fundamental vs. realizedb. Effects of overlapping speciesII. Other species interactionsa. Mutualism vs. antagonismb. Predationc. Trophic levelsIII. Populationsa. Definitionb. Factors affecting population sizec. Population distributionsIV. Ecological succession Outline of Current Lecture I. Integrating evolution and ecologya. Definitionsb. Synthesis II. Reviewing the history of life on eartha. Adapting to a life on landb. The role of extinctioni. The impact of mass extinctionsIII. The Anthropocenea. Humans dominate the earthb. Climate changec. Our current mass extinction i. Data from recent research d. Meeting the challenge Current LectureThe Anthropocene- one species dictates planetary changeClicker questions:What is biological evolution?*Change in allele frequency over timeThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.What is the unit of evolution?*Population (evolution acts to change gene frequencies in populations)What is ecology?*Interaction of organisms to each other and to the environmentHow does ecology relate to diversity?*Genetic variations colonize novel habitatsLamarck- theory proved wrongs through understanding of acquired traits (ex. Losing a limb doesnot mean your offspring will be missing a limb)Recalling history of life on EarthFirst life: 3 billion years ago - Prokaryotes own earth for one billion years First eukaryote: 2 billion years ago- Archaea- clear bridge to eukaryotes First multicellularity: 700 million years ago- All aquaticFirst land dweller: 450 million years ago Perspectives-Diversity of life- 1.9 million species named by us - More to discoverExtinction-- Normal component of evolution - Originate and go extinct o Average lifespan of mammal species= +/- 1 million years - Mass extinctiono Catastrophic eventsPattern of mass extinction Irregular in time*Most attributed to climate change The anthropocene Current era- One species dominates - Massive population growth (48.1)- Influencing ecology of planeto Invasive species (48.20)- Global Warming (48.5)o Causing mass extinctiono Extinction risks from climate change are accelerating o Temperature increases, extinction rate increaseso Response: move, adapt or perish Climate change and deforestation
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