Announcement LELLA reports due next week with Team Evaluations Quiz 3 December 2

Population

Objectives: Understand the difference between exponential and logistic population growth Understand how easy access to birth control influences population growth Calculate and Compare population growth rates.

World Population

World – billion people US Population – million people wdi&met=sp_pop_totl&tdim=true&q=global+population

Population Density

Terms to know Growth Rate = birth rate + immigration rate – (death rate + emigration rate) or birth rate + immigration rate – death rate – emigration rate Doubling time –The time it takes for a population to double if it is growing at a constant rate –Doubling Time (years) = 70 / Growth Rate (%) –Growth Rate (%) = 70 / Doubling Time (years)

Growth & Fertility Rates Total Fertility Rate = Average number of children born per female over her lifetime Replacement Fertility Rate = Total Fertility rate that maintains a stable population size For humans = 2.1

Factors that affect Population Growth Environmental Resistance Health – Medicine Resources – Food, Water Technology Birth Control –Issues in abortion, religious beliefs, education, planned parenthood,China one child policy

Specific cases China – 1.3 billion 1.1 % growth rate –One Child Policy (lowered from 2.8% to 0.7%) –One-Two-Four Problem, infanticide, unequal sex ratio, sex selective abortions, spoilt children India – 1.1 billion 2.2 % growth rate –No apparent growth control agenda

Types of growth Logistic Growth –Population that is not increasing –Carrying Capacity – maximum population size that a given environment can sustain Exponential Growth –Increasing by a fixed % each year –Example of Compound interest of $

Resource Consumption Thomas Malthus –Predicted that population growth was exceeding food production and would be a limiting factor.

Carrying Capacity (K) The population that an area will support without undergoing environmental deterioration. The carrying capacity of an environment tends to limit population size. Food availability, reproductive behavior, and infectious diseases tend to keep animal populations in check.

Sustainability Definition “Meeting the needs of the present without compromising the ability of future generations to meet their own needs.”

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Marine Fisheries Objectives: –To understand the impact of humans on a global scale –To understand the concept of carrying capacity and “tragedy of the commons” –Be familiarized, through the provided example, of the real threat confronting global marine fisheries

Marine Fisheries Problems –Increase in technology –Increase in # of fishermen –Over fishing –Destruction of coral reefs “Tragedy of the Commons” – Garrett Hardin

Sustainable Fisheries Solutions –Aquaculture or fish farming (1/3 of produce) Also has some environmental problems –Deforestation, food for fish stock, waste material –Sustainable Fishing

Lab Experiment Scenario 1 – Sustainable Fishing Scenario 2 – Improved Technology Scenario 3 – Improved Technology with aggressive Fishing

Read Instructions Carefully Start with 20 brown and 10 white for the first season ONLY for each scenario. Every other season use the beans left from the previous season. To determine Fish available for next season –Medium Value fish 1 st and 2 nd season = fish left + (0.5 * fish left) –High Value fish 1 st season =fish left; 2 nd season only= fish left + (0.5 * fish left) If no more fishes left to catch start recording negatives. For graph plot # of fish available for next season (y axis) against seasons (x axis) for medium and high value fish Season # of fish M H