Biology 2483A Lecture Notes - Lecture 11: Poa Annua, Ecological Footprint, Life Table
12 Dec 2017
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Document Summary
From 1860 to 1991, human population quadrupled in size, and energy consumption increased 93- fold. For thousands of years our population grew relatively slowly, reaching 1 billion for the first time in. In 2007: 11. 9 billion hectares of productive land available globally, average ecological footprint: 2. 7 hectares. Suggests a carrying capacity of 4. 4 billion: population: 6. 7 billion, a 50% overshoot of carrying capacity. If everyone in the world used resources at the same rate as: u. s. citizens in 2006, carrying capacity would be 1. 3 billion people. Indian citizens in 2006, carrying capacity would be 14 billion people. A life table is a summary of how survival and reproductive rates vary with age. Information about births and deaths is essential to predict future population size. Life table data for the grass poa annua were collected by marking 843 naturally germinating seedlings and then following their fates over time.
